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 #include <linux/ioam6.h>
93
94 #define INFINITY_LIFE_TIME 0xFFFFFFFF
95
96 #define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
98
cstamp_delta(unsigned long cstamp)99 static inline u32 cstamp_delta(unsigned long cstamp)
100 {
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
102 }
103
rfc3315_s14_backoff_init(s32 irt)104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
105 {
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
108 do_div(tmp, 1000000);
109 return (s32)tmp;
110 }
111
rfc3315_s14_backoff_update(s32 rt,s32 mrt)112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
113 {
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
120 do_div(tmp, 1000000);
121 }
122 return (s32)tmp;
123 }
124
125 #ifdef CONFIG_SYSCTL
126 static int addrconf_sysctl_register(struct inet6_dev *idev);
127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
128 #else
addrconf_sysctl_register(struct inet6_dev * idev)129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
130 {
131 return 0;
132 }
133
addrconf_sysctl_unregister(struct inet6_dev * idev)134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
135 {
136 }
137 #endif
138
139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
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 static void addrconf_verify(struct net *net);
151 static void addrconf_verify_rtnl(struct net *net);
152
153 static struct workqueue_struct *addrconf_wq;
154
155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
157
158 static void addrconf_type_change(struct net_device *dev,
159 unsigned long event);
160 static int addrconf_ifdown(struct net_device *dev, bool unregister);
161
162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
163 int plen,
164 const struct net_device *dev,
165 u32 flags, u32 noflags,
166 bool no_gw);
167
168 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
169 static void addrconf_dad_work(struct work_struct *w);
170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
171 bool send_na);
172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
173 static void addrconf_rs_timer(struct timer_list *t);
174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
176
177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
178 struct prefix_info *pinfo);
179
180 static struct ipv6_devconf ipv6_devconf __read_mostly = {
181 .forwarding = 0,
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
184 .accept_ra = 1,
185 .accept_redirects = 1,
186 .autoconf = 1,
187 .force_mld_version = 0,
188 .mldv1_unsolicited_report_interval = 10 * HZ,
189 .mldv2_unsolicited_report_interval = HZ,
190 .dad_transmits = 1,
191 .rtr_solicits = MAX_RTR_SOLICITATIONS,
192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
195 .use_tempaddr = 0,
196 .temp_valid_lft = TEMP_VALID_LIFETIME,
197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
200 .max_addresses = IPV6_MAX_ADDRESSES,
201 .accept_ra_defrtr = 1,
202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
203 .accept_ra_from_local = 0,
204 .accept_ra_min_hop_limit= 1,
205 .accept_ra_min_lft = 0,
206 .accept_ra_pinfo = 1,
207 #ifdef CONFIG_IPV6_ROUTER_PREF
208 .accept_ra_rtr_pref = 1,
209 .rtr_probe_interval = 60 * HZ,
210 #ifdef CONFIG_IPV6_ROUTE_INFO
211 .accept_ra_rt_info_min_plen = 0,
212 .accept_ra_rt_info_max_plen = 0,
213 #endif
214 #endif
215 .proxy_ndp = 0,
216 .accept_source_route = 0, /* we do not accept RH0 by default. */
217 .disable_ipv6 = 0,
218 .accept_dad = 0,
219 .suppress_frag_ndisc = 1,
220 .accept_ra_mtu = 1,
221 .stable_secret = {
222 .initialized = false,
223 },
224 .use_oif_addrs_only = 0,
225 .ignore_routes_with_linkdown = 0,
226 .keep_addr_on_down = 0,
227 .seg6_enabled = 0,
228 #ifdef CONFIG_IPV6_SEG6_HMAC
229 .seg6_require_hmac = 0,
230 #endif
231 .enhanced_dad = 1,
232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
233 .disable_policy = 0,
234 .rpl_seg_enabled = 0,
235 .ioam6_enabled = 0,
236 .ioam6_id = IOAM6_DEFAULT_IF_ID,
237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
238 .ndisc_evict_nocarrier = 1,
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 .ra_defrtr_metric = IP6_RT_PRIO_USER,
264 .accept_ra_from_local = 0,
265 .accept_ra_min_hop_limit= 1,
266 .accept_ra_min_lft = 0,
267 .accept_ra_pinfo = 1,
268 #ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
270 .rtr_probe_interval = 60 * HZ,
271 #ifdef CONFIG_IPV6_ROUTE_INFO
272 .accept_ra_rt_info_min_plen = 0,
273 .accept_ra_rt_info_max_plen = 0,
274 #endif
275 #endif
276 .proxy_ndp = 0,
277 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .disable_ipv6 = 0,
279 .accept_dad = 1,
280 .suppress_frag_ndisc = 1,
281 .accept_ra_mtu = 1,
282 .stable_secret = {
283 .initialized = false,
284 },
285 .use_oif_addrs_only = 0,
286 .ignore_routes_with_linkdown = 0,
287 .keep_addr_on_down = 0,
288 .seg6_enabled = 0,
289 #ifdef CONFIG_IPV6_SEG6_HMAC
290 .seg6_require_hmac = 0,
291 #endif
292 .enhanced_dad = 1,
293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
294 .disable_policy = 0,
295 .rpl_seg_enabled = 0,
296 .ioam6_enabled = 0,
297 .ioam6_id = IOAM6_DEFAULT_IF_ID,
298 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
299 .ndisc_evict_nocarrier = 1,
300 };
301
302 /* Check if link is ready: is it up and is a valid qdisc available */
addrconf_link_ready(const struct net_device * dev)303 static inline bool addrconf_link_ready(const struct net_device *dev)
304 {
305 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
306 }
307
addrconf_del_rs_timer(struct inet6_dev * idev)308 static void addrconf_del_rs_timer(struct inet6_dev *idev)
309 {
310 if (del_timer(&idev->rs_timer))
311 __in6_dev_put(idev);
312 }
313
addrconf_del_dad_work(struct inet6_ifaddr * ifp)314 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
315 {
316 if (cancel_delayed_work(&ifp->dad_work))
317 __in6_ifa_put(ifp);
318 }
319
addrconf_mod_rs_timer(struct inet6_dev * idev,unsigned long when)320 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
321 unsigned long when)
322 {
323 if (!mod_timer(&idev->rs_timer, jiffies + when))
324 in6_dev_hold(idev);
325 }
326
addrconf_mod_dad_work(struct inet6_ifaddr * ifp,unsigned long delay)327 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
328 unsigned long delay)
329 {
330 in6_ifa_hold(ifp);
331 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
332 in6_ifa_put(ifp);
333 }
334
snmp6_alloc_dev(struct inet6_dev * idev)335 static int snmp6_alloc_dev(struct inet6_dev *idev)
336 {
337 int i;
338
339 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
340 if (!idev->stats.ipv6)
341 goto err_ip;
342
343 for_each_possible_cpu(i) {
344 struct ipstats_mib *addrconf_stats;
345 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
346 u64_stats_init(&addrconf_stats->syncp);
347 }
348
349
350 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
351 GFP_KERNEL);
352 if (!idev->stats.icmpv6dev)
353 goto err_icmp;
354 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
355 GFP_KERNEL_ACCOUNT);
356 if (!idev->stats.icmpv6msgdev)
357 goto err_icmpmsg;
358
359 return 0;
360
361 err_icmpmsg:
362 kfree(idev->stats.icmpv6dev);
363 err_icmp:
364 free_percpu(idev->stats.ipv6);
365 err_ip:
366 return -ENOMEM;
367 }
368
ipv6_add_dev(struct net_device * dev)369 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
370 {
371 struct inet6_dev *ndev;
372 int err = -ENOMEM;
373
374 ASSERT_RTNL();
375
376 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
377 return ERR_PTR(-EINVAL);
378
379 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
380 if (!ndev)
381 return ERR_PTR(err);
382
383 rwlock_init(&ndev->lock);
384 ndev->dev = dev;
385 INIT_LIST_HEAD(&ndev->addr_list);
386 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
387 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
388
389 if (ndev->cnf.stable_secret.initialized)
390 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
391
392 ndev->cnf.mtu6 = dev->mtu;
393 ndev->ra_mtu = 0;
394 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
395 if (!ndev->nd_parms) {
396 kfree(ndev);
397 return ERR_PTR(err);
398 }
399 if (ndev->cnf.forwarding)
400 dev_disable_lro(dev);
401 /* We refer to the device */
402 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
403
404 if (snmp6_alloc_dev(ndev) < 0) {
405 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
406 __func__);
407 neigh_parms_release(&nd_tbl, ndev->nd_parms);
408 netdev_put(dev, &ndev->dev_tracker);
409 kfree(ndev);
410 return ERR_PTR(err);
411 }
412
413 if (dev != blackhole_netdev) {
414 if (snmp6_register_dev(ndev) < 0) {
415 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
416 __func__, dev->name);
417 goto err_release;
418 }
419 }
420 /* One reference from device. */
421 refcount_set(&ndev->refcnt, 1);
422
423 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
424 ndev->cnf.accept_dad = -1;
425
426 #if IS_ENABLED(CONFIG_IPV6_SIT)
427 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
428 pr_info("%s: Disabled Multicast RS\n", dev->name);
429 ndev->cnf.rtr_solicits = 0;
430 }
431 #endif
432
433 INIT_LIST_HEAD(&ndev->tempaddr_list);
434 ndev->desync_factor = U32_MAX;
435 if ((dev->flags&IFF_LOOPBACK) ||
436 dev->type == ARPHRD_TUNNEL ||
437 dev->type == ARPHRD_TUNNEL6 ||
438 dev->type == ARPHRD_SIT ||
439 dev->type == ARPHRD_NONE) {
440 ndev->cnf.use_tempaddr = -1;
441 }
442
443 ndev->token = in6addr_any;
444
445 if (netif_running(dev) && addrconf_link_ready(dev))
446 ndev->if_flags |= IF_READY;
447
448 ipv6_mc_init_dev(ndev);
449 ndev->tstamp = jiffies;
450 if (dev != blackhole_netdev) {
451 err = addrconf_sysctl_register(ndev);
452 if (err) {
453 ipv6_mc_destroy_dev(ndev);
454 snmp6_unregister_dev(ndev);
455 goto err_release;
456 }
457 }
458 /* protected by rtnl_lock */
459 rcu_assign_pointer(dev->ip6_ptr, ndev);
460
461 if (dev != blackhole_netdev) {
462 /* Join interface-local all-node multicast group */
463 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
464
465 /* Join all-node multicast group */
466 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
467
468 /* Join all-router multicast group if forwarding is set */
469 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
471 }
472 return ndev;
473
474 err_release:
475 neigh_parms_release(&nd_tbl, ndev->nd_parms);
476 ndev->dead = 1;
477 in6_dev_finish_destroy(ndev);
478 return ERR_PTR(err);
479 }
480
ipv6_find_idev(struct net_device * dev)481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
482 {
483 struct inet6_dev *idev;
484
485 ASSERT_RTNL();
486
487 idev = __in6_dev_get(dev);
488 if (!idev) {
489 idev = ipv6_add_dev(dev);
490 if (IS_ERR(idev))
491 return idev;
492 }
493
494 if (dev->flags&IFF_UP)
495 ipv6_mc_up(idev);
496 return idev;
497 }
498
inet6_netconf_msgsize_devconf(int type)499 static int inet6_netconf_msgsize_devconf(int type)
500 {
501 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
502 + nla_total_size(4); /* NETCONFA_IFINDEX */
503 bool all = false;
504
505 if (type == NETCONFA_ALL)
506 all = true;
507
508 if (all || type == NETCONFA_FORWARDING)
509 size += nla_total_size(4);
510 #ifdef CONFIG_IPV6_MROUTE
511 if (all || type == NETCONFA_MC_FORWARDING)
512 size += nla_total_size(4);
513 #endif
514 if (all || type == NETCONFA_PROXY_NEIGH)
515 size += nla_total_size(4);
516
517 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
518 size += nla_total_size(4);
519
520 return size;
521 }
522
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)523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
524 struct ipv6_devconf *devconf, u32 portid,
525 u32 seq, int event, unsigned int flags,
526 int type)
527 {
528 struct nlmsghdr *nlh;
529 struct netconfmsg *ncm;
530 bool all = false;
531
532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
533 flags);
534 if (!nlh)
535 return -EMSGSIZE;
536
537 if (type == NETCONFA_ALL)
538 all = true;
539
540 ncm = nlmsg_data(nlh);
541 ncm->ncm_family = AF_INET6;
542
543 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
544 goto nla_put_failure;
545
546 if (!devconf)
547 goto out;
548
549 if ((all || type == NETCONFA_FORWARDING) &&
550 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
551 goto nla_put_failure;
552 #ifdef CONFIG_IPV6_MROUTE
553 if ((all || type == NETCONFA_MC_FORWARDING) &&
554 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
555 atomic_read(&devconf->mc_forwarding)) < 0)
556 goto nla_put_failure;
557 #endif
558 if ((all || type == NETCONFA_PROXY_NEIGH) &&
559 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
560 goto nla_put_failure;
561
562 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
563 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
564 devconf->ignore_routes_with_linkdown) < 0)
565 goto nla_put_failure;
566
567 out:
568 nlmsg_end(skb, nlh);
569 return 0;
570
571 nla_put_failure:
572 nlmsg_cancel(skb, nlh);
573 return -EMSGSIZE;
574 }
575
inet6_netconf_notify_devconf(struct net * net,int event,int type,int ifindex,struct ipv6_devconf * devconf)576 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
577 int ifindex, struct ipv6_devconf *devconf)
578 {
579 struct sk_buff *skb;
580 int err = -ENOBUFS;
581
582 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
583 if (!skb)
584 goto errout;
585
586 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
587 event, 0, type);
588 if (err < 0) {
589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
590 WARN_ON(err == -EMSGSIZE);
591 kfree_skb(skb);
592 goto errout;
593 }
594 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
595 return;
596 errout:
597 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
598 }
599
600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
601 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
602 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
603 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
604 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
605 };
606
inet6_netconf_valid_get_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)607 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
608 const struct nlmsghdr *nlh,
609 struct nlattr **tb,
610 struct netlink_ext_ack *extack)
611 {
612 int i, err;
613
614 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
615 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
616 return -EINVAL;
617 }
618
619 if (!netlink_strict_get_check(skb))
620 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
621 tb, NETCONFA_MAX,
622 devconf_ipv6_policy, extack);
623
624 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
625 tb, NETCONFA_MAX,
626 devconf_ipv6_policy, extack);
627 if (err)
628 return err;
629
630 for (i = 0; i <= NETCONFA_MAX; i++) {
631 if (!tb[i])
632 continue;
633
634 switch (i) {
635 case NETCONFA_IFINDEX:
636 break;
637 default:
638 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
639 return -EINVAL;
640 }
641 }
642
643 return 0;
644 }
645
inet6_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
647 struct nlmsghdr *nlh,
648 struct netlink_ext_ack *extack)
649 {
650 struct net *net = sock_net(in_skb->sk);
651 struct nlattr *tb[NETCONFA_MAX+1];
652 struct inet6_dev *in6_dev = NULL;
653 struct net_device *dev = NULL;
654 struct sk_buff *skb;
655 struct ipv6_devconf *devconf;
656 int ifindex;
657 int err;
658
659 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
660 if (err < 0)
661 return err;
662
663 if (!tb[NETCONFA_IFINDEX])
664 return -EINVAL;
665
666 err = -EINVAL;
667 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
668 switch (ifindex) {
669 case NETCONFA_IFINDEX_ALL:
670 devconf = net->ipv6.devconf_all;
671 break;
672 case NETCONFA_IFINDEX_DEFAULT:
673 devconf = net->ipv6.devconf_dflt;
674 break;
675 default:
676 dev = dev_get_by_index(net, ifindex);
677 if (!dev)
678 return -EINVAL;
679 in6_dev = in6_dev_get(dev);
680 if (!in6_dev)
681 goto errout;
682 devconf = &in6_dev->cnf;
683 break;
684 }
685
686 err = -ENOBUFS;
687 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
688 if (!skb)
689 goto errout;
690
691 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
692 NETLINK_CB(in_skb).portid,
693 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
694 NETCONFA_ALL);
695 if (err < 0) {
696 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
697 WARN_ON(err == -EMSGSIZE);
698 kfree_skb(skb);
699 goto errout;
700 }
701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
702 errout:
703 if (in6_dev)
704 in6_dev_put(in6_dev);
705 dev_put(dev);
706 return err;
707 }
708
709 /* Combine dev_addr_genid and dev_base_seq to detect changes.
710 */
inet6_base_seq(const struct net * net)711 static u32 inet6_base_seq(const struct net *net)
712 {
713 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
714 net->dev_base_seq;
715
716 /* Must not return 0 (see nl_dump_check_consistent()).
717 * Chose a value far away from 0.
718 */
719 if (!res)
720 res = 0x80000000;
721 return res;
722 }
723
724
inet6_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)725 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
726 struct netlink_callback *cb)
727 {
728 const struct nlmsghdr *nlh = cb->nlh;
729 struct net *net = sock_net(skb->sk);
730 int h, s_h;
731 int idx, s_idx;
732 struct net_device *dev;
733 struct inet6_dev *idev;
734 struct hlist_head *head;
735
736 if (cb->strict_check) {
737 struct netlink_ext_ack *extack = cb->extack;
738 struct netconfmsg *ncm;
739
740 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
741 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
742 return -EINVAL;
743 }
744
745 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
746 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
747 return -EINVAL;
748 }
749 }
750
751 s_h = cb->args[0];
752 s_idx = idx = cb->args[1];
753
754 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
755 idx = 0;
756 head = &net->dev_index_head[h];
757 rcu_read_lock();
758 cb->seq = inet6_base_seq(net);
759 hlist_for_each_entry_rcu(dev, head, index_hlist) {
760 if (idx < s_idx)
761 goto cont;
762 idev = __in6_dev_get(dev);
763 if (!idev)
764 goto cont;
765
766 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
767 &idev->cnf,
768 NETLINK_CB(cb->skb).portid,
769 nlh->nlmsg_seq,
770 RTM_NEWNETCONF,
771 NLM_F_MULTI,
772 NETCONFA_ALL) < 0) {
773 rcu_read_unlock();
774 goto done;
775 }
776 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
777 cont:
778 idx++;
779 }
780 rcu_read_unlock();
781 }
782 if (h == NETDEV_HASHENTRIES) {
783 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
784 net->ipv6.devconf_all,
785 NETLINK_CB(cb->skb).portid,
786 nlh->nlmsg_seq,
787 RTM_NEWNETCONF, NLM_F_MULTI,
788 NETCONFA_ALL) < 0)
789 goto done;
790 else
791 h++;
792 }
793 if (h == NETDEV_HASHENTRIES + 1) {
794 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
795 net->ipv6.devconf_dflt,
796 NETLINK_CB(cb->skb).portid,
797 nlh->nlmsg_seq,
798 RTM_NEWNETCONF, NLM_F_MULTI,
799 NETCONFA_ALL) < 0)
800 goto done;
801 else
802 h++;
803 }
804 done:
805 cb->args[0] = h;
806 cb->args[1] = idx;
807
808 return skb->len;
809 }
810
811 #ifdef CONFIG_SYSCTL
dev_forward_change(struct inet6_dev * idev)812 static void dev_forward_change(struct inet6_dev *idev)
813 {
814 struct net_device *dev;
815 struct inet6_ifaddr *ifa;
816 LIST_HEAD(tmp_addr_list);
817
818 if (!idev)
819 return;
820 dev = idev->dev;
821 if (idev->cnf.forwarding)
822 dev_disable_lro(dev);
823 if (dev->flags & IFF_MULTICAST) {
824 if (idev->cnf.forwarding) {
825 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
826 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
827 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
828 } else {
829 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
830 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
831 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
832 }
833 }
834
835 read_lock_bh(&idev->lock);
836 list_for_each_entry(ifa, &idev->addr_list, if_list) {
837 if (ifa->flags&IFA_F_TENTATIVE)
838 continue;
839 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
840 }
841 read_unlock_bh(&idev->lock);
842
843 while (!list_empty(&tmp_addr_list)) {
844 ifa = list_first_entry(&tmp_addr_list,
845 struct inet6_ifaddr, if_list_aux);
846 list_del(&ifa->if_list_aux);
847 if (idev->cnf.forwarding)
848 addrconf_join_anycast(ifa);
849 else
850 addrconf_leave_anycast(ifa);
851 }
852
853 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
854 NETCONFA_FORWARDING,
855 dev->ifindex, &idev->cnf);
856 }
857
858
addrconf_forward_change(struct net * net,__s32 newf)859 static void addrconf_forward_change(struct net *net, __s32 newf)
860 {
861 struct net_device *dev;
862 struct inet6_dev *idev;
863
864 for_each_netdev(net, dev) {
865 idev = __in6_dev_get(dev);
866 if (idev) {
867 int changed = (!idev->cnf.forwarding) ^ (!newf);
868 idev->cnf.forwarding = newf;
869 if (changed)
870 dev_forward_change(idev);
871 }
872 }
873 }
874
addrconf_fixup_forwarding(struct ctl_table * table,int * p,int newf)875 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
876 {
877 struct net *net;
878 int old;
879
880 if (!rtnl_trylock())
881 return restart_syscall();
882
883 net = (struct net *)table->extra2;
884 old = *p;
885 *p = newf;
886
887 if (p == &net->ipv6.devconf_dflt->forwarding) {
888 if ((!newf) ^ (!old))
889 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
890 NETCONFA_FORWARDING,
891 NETCONFA_IFINDEX_DEFAULT,
892 net->ipv6.devconf_dflt);
893 rtnl_unlock();
894 return 0;
895 }
896
897 if (p == &net->ipv6.devconf_all->forwarding) {
898 int old_dflt = net->ipv6.devconf_dflt->forwarding;
899
900 net->ipv6.devconf_dflt->forwarding = newf;
901 if ((!newf) ^ (!old_dflt))
902 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
903 NETCONFA_FORWARDING,
904 NETCONFA_IFINDEX_DEFAULT,
905 net->ipv6.devconf_dflt);
906
907 addrconf_forward_change(net, newf);
908 if ((!newf) ^ (!old))
909 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
910 NETCONFA_FORWARDING,
911 NETCONFA_IFINDEX_ALL,
912 net->ipv6.devconf_all);
913 } else if ((!newf) ^ (!old))
914 dev_forward_change((struct inet6_dev *)table->extra1);
915 rtnl_unlock();
916
917 if (newf)
918 rt6_purge_dflt_routers(net);
919 return 1;
920 }
921
addrconf_linkdown_change(struct net * net,__s32 newf)922 static void addrconf_linkdown_change(struct net *net, __s32 newf)
923 {
924 struct net_device *dev;
925 struct inet6_dev *idev;
926
927 for_each_netdev(net, dev) {
928 idev = __in6_dev_get(dev);
929 if (idev) {
930 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
931
932 idev->cnf.ignore_routes_with_linkdown = newf;
933 if (changed)
934 inet6_netconf_notify_devconf(dev_net(dev),
935 RTM_NEWNETCONF,
936 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
937 dev->ifindex,
938 &idev->cnf);
939 }
940 }
941 }
942
addrconf_fixup_linkdown(struct ctl_table * table,int * p,int newf)943 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
944 {
945 struct net *net;
946 int old;
947
948 if (!rtnl_trylock())
949 return restart_syscall();
950
951 net = (struct net *)table->extra2;
952 old = *p;
953 *p = newf;
954
955 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
956 if ((!newf) ^ (!old))
957 inet6_netconf_notify_devconf(net,
958 RTM_NEWNETCONF,
959 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
960 NETCONFA_IFINDEX_DEFAULT,
961 net->ipv6.devconf_dflt);
962 rtnl_unlock();
963 return 0;
964 }
965
966 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
967 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
968 addrconf_linkdown_change(net, newf);
969 if ((!newf) ^ (!old))
970 inet6_netconf_notify_devconf(net,
971 RTM_NEWNETCONF,
972 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
973 NETCONFA_IFINDEX_ALL,
974 net->ipv6.devconf_all);
975 }
976 rtnl_unlock();
977
978 return 1;
979 }
980
981 #endif
982
983 /* Nobody refers to this ifaddr, destroy it */
inet6_ifa_finish_destroy(struct inet6_ifaddr * ifp)984 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
985 {
986 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
987
988 #ifdef NET_REFCNT_DEBUG
989 pr_debug("%s\n", __func__);
990 #endif
991
992 in6_dev_put(ifp->idev);
993
994 if (cancel_delayed_work(&ifp->dad_work))
995 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
996 ifp);
997
998 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
999 pr_warn("Freeing alive inet6 address %p\n", ifp);
1000 return;
1001 }
1002
1003 kfree_rcu(ifp, rcu);
1004 }
1005
1006 static void
ipv6_link_dev_addr(struct inet6_dev * idev,struct inet6_ifaddr * ifp)1007 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
1008 {
1009 struct list_head *p;
1010 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1011
1012 /*
1013 * Each device address list is sorted in order of scope -
1014 * global before linklocal.
1015 */
1016 list_for_each(p, &idev->addr_list) {
1017 struct inet6_ifaddr *ifa
1018 = list_entry(p, struct inet6_ifaddr, if_list);
1019 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1020 break;
1021 }
1022
1023 list_add_tail_rcu(&ifp->if_list, p);
1024 }
1025
inet6_addr_hash(const struct net * net,const struct in6_addr * addr)1026 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1027 {
1028 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1029
1030 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1031 }
1032
ipv6_chk_same_addr(struct net * net,const struct in6_addr * addr,struct net_device * dev,unsigned int hash)1033 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1034 struct net_device *dev, unsigned int hash)
1035 {
1036 struct inet6_ifaddr *ifp;
1037
1038 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1039 if (ipv6_addr_equal(&ifp->addr, addr)) {
1040 if (!dev || ifp->idev->dev == dev)
1041 return true;
1042 }
1043 }
1044 return false;
1045 }
1046
ipv6_add_addr_hash(struct net_device * dev,struct inet6_ifaddr * ifa)1047 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1048 {
1049 struct net *net = dev_net(dev);
1050 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1051 int err = 0;
1052
1053 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1054
1055 /* Ignore adding duplicate addresses on an interface */
1056 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1057 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1058 err = -EEXIST;
1059 } else {
1060 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1061 }
1062
1063 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1064
1065 return err;
1066 }
1067
1068 /* On success it returns ifp with increased reference count */
1069
1070 static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev * idev,struct ifa6_config * cfg,bool can_block,struct netlink_ext_ack * extack)1071 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1072 bool can_block, struct netlink_ext_ack *extack)
1073 {
1074 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1075 int addr_type = ipv6_addr_type(cfg->pfx);
1076 struct net *net = dev_net(idev->dev);
1077 struct inet6_ifaddr *ifa = NULL;
1078 struct fib6_info *f6i = NULL;
1079 int err = 0;
1080
1081 if (addr_type == IPV6_ADDR_ANY) {
1082 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1083 return ERR_PTR(-EADDRNOTAVAIL);
1084 } else if (addr_type & IPV6_ADDR_MULTICAST &&
1085 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1086 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1087 return ERR_PTR(-EADDRNOTAVAIL);
1088 } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1089 !netif_is_l3_master(idev->dev) &&
1090 addr_type & IPV6_ADDR_LOOPBACK) {
1091 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1092 return ERR_PTR(-EADDRNOTAVAIL);
1093 }
1094
1095 if (idev->dead) {
1096 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1097 err = -ENODEV;
1098 goto out;
1099 }
1100
1101 if (idev->cnf.disable_ipv6) {
1102 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1103 err = -EACCES;
1104 goto out;
1105 }
1106
1107 /* validator notifier needs to be blocking;
1108 * do not call in atomic context
1109 */
1110 if (can_block) {
1111 struct in6_validator_info i6vi = {
1112 .i6vi_addr = *cfg->pfx,
1113 .i6vi_dev = idev,
1114 .extack = extack,
1115 };
1116
1117 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1118 err = notifier_to_errno(err);
1119 if (err < 0)
1120 goto out;
1121 }
1122
1123 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1124 if (!ifa) {
1125 err = -ENOBUFS;
1126 goto out;
1127 }
1128
1129 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1130 if (IS_ERR(f6i)) {
1131 err = PTR_ERR(f6i);
1132 f6i = NULL;
1133 goto out;
1134 }
1135
1136 neigh_parms_data_state_setall(idev->nd_parms);
1137
1138 ifa->addr = *cfg->pfx;
1139 if (cfg->peer_pfx)
1140 ifa->peer_addr = *cfg->peer_pfx;
1141
1142 spin_lock_init(&ifa->lock);
1143 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1144 INIT_HLIST_NODE(&ifa->addr_lst);
1145 ifa->scope = cfg->scope;
1146 ifa->prefix_len = cfg->plen;
1147 ifa->rt_priority = cfg->rt_priority;
1148 ifa->flags = cfg->ifa_flags;
1149 ifa->ifa_proto = cfg->ifa_proto;
1150 /* No need to add the TENTATIVE flag for addresses with NODAD */
1151 if (!(cfg->ifa_flags & IFA_F_NODAD))
1152 ifa->flags |= IFA_F_TENTATIVE;
1153 ifa->valid_lft = cfg->valid_lft;
1154 ifa->prefered_lft = cfg->preferred_lft;
1155 ifa->cstamp = ifa->tstamp = jiffies;
1156 ifa->tokenized = false;
1157
1158 ifa->rt = f6i;
1159
1160 ifa->idev = idev;
1161 in6_dev_hold(idev);
1162
1163 /* For caller */
1164 refcount_set(&ifa->refcnt, 1);
1165
1166 rcu_read_lock();
1167
1168 err = ipv6_add_addr_hash(idev->dev, ifa);
1169 if (err < 0) {
1170 rcu_read_unlock();
1171 goto out;
1172 }
1173
1174 write_lock_bh(&idev->lock);
1175
1176 /* Add to inet6_dev unicast addr list. */
1177 ipv6_link_dev_addr(idev, ifa);
1178
1179 if (ifa->flags&IFA_F_TEMPORARY) {
1180 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1181 in6_ifa_hold(ifa);
1182 }
1183
1184 in6_ifa_hold(ifa);
1185 write_unlock_bh(&idev->lock);
1186
1187 rcu_read_unlock();
1188
1189 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1190 out:
1191 if (unlikely(err < 0)) {
1192 fib6_info_release(f6i);
1193
1194 if (ifa) {
1195 if (ifa->idev)
1196 in6_dev_put(ifa->idev);
1197 kfree(ifa);
1198 }
1199 ifa = ERR_PTR(err);
1200 }
1201
1202 return ifa;
1203 }
1204
1205 enum cleanup_prefix_rt_t {
1206 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1207 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1208 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1209 };
1210
1211 /*
1212 * Check, whether the prefix for ifp would still need a prefix route
1213 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1214 * constants.
1215 *
1216 * 1) we don't purge prefix if address was not permanent.
1217 * prefix is managed by its own lifetime.
1218 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1219 * 3) if there are no addresses, delete prefix.
1220 * 4) if there are still other permanent address(es),
1221 * corresponding prefix is still permanent.
1222 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1223 * don't purge the prefix, assume user space is managing it.
1224 * 6) otherwise, update prefix lifetime to the
1225 * longest valid lifetime among the corresponding
1226 * addresses on the device.
1227 * Note: subsequent RA will update lifetime.
1228 **/
1229 static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long * expires)1230 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1231 {
1232 struct inet6_ifaddr *ifa;
1233 struct inet6_dev *idev = ifp->idev;
1234 unsigned long lifetime;
1235 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1236
1237 *expires = jiffies;
1238
1239 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1240 if (ifa == ifp)
1241 continue;
1242 if (ifa->prefix_len != ifp->prefix_len ||
1243 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1244 ifp->prefix_len))
1245 continue;
1246 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1247 return CLEANUP_PREFIX_RT_NOP;
1248
1249 action = CLEANUP_PREFIX_RT_EXPIRE;
1250
1251 spin_lock(&ifa->lock);
1252
1253 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1254 /*
1255 * Note: Because this address is
1256 * not permanent, lifetime <
1257 * LONG_MAX / HZ here.
1258 */
1259 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1260 *expires = ifa->tstamp + lifetime * HZ;
1261 spin_unlock(&ifa->lock);
1262 }
1263
1264 return action;
1265 }
1266
1267 static void
cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,bool del_rt,bool del_peer)1268 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1269 bool del_rt, bool del_peer)
1270 {
1271 struct fib6_info *f6i;
1272
1273 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1274 ifp->prefix_len,
1275 ifp->idev->dev, 0, RTF_DEFAULT, true);
1276 if (f6i) {
1277 if (del_rt)
1278 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1279 else {
1280 if (!(f6i->fib6_flags & RTF_EXPIRES))
1281 fib6_set_expires(f6i, expires);
1282 fib6_info_release(f6i);
1283 }
1284 }
1285 }
1286
1287
1288 /* This function wants to get referenced ifp and releases it before return */
1289
ipv6_del_addr(struct inet6_ifaddr * ifp)1290 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1291 {
1292 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1293 struct net *net = dev_net(ifp->idev->dev);
1294 unsigned long expires;
1295 int state;
1296
1297 ASSERT_RTNL();
1298
1299 spin_lock_bh(&ifp->lock);
1300 state = ifp->state;
1301 ifp->state = INET6_IFADDR_STATE_DEAD;
1302 spin_unlock_bh(&ifp->lock);
1303
1304 if (state == INET6_IFADDR_STATE_DEAD)
1305 goto out;
1306
1307 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1308 hlist_del_init_rcu(&ifp->addr_lst);
1309 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1310
1311 write_lock_bh(&ifp->idev->lock);
1312
1313 if (ifp->flags&IFA_F_TEMPORARY) {
1314 list_del(&ifp->tmp_list);
1315 if (ifp->ifpub) {
1316 in6_ifa_put(ifp->ifpub);
1317 ifp->ifpub = NULL;
1318 }
1319 __in6_ifa_put(ifp);
1320 }
1321
1322 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1323 action = check_cleanup_prefix_route(ifp, &expires);
1324
1325 list_del_rcu(&ifp->if_list);
1326 __in6_ifa_put(ifp);
1327
1328 write_unlock_bh(&ifp->idev->lock);
1329
1330 addrconf_del_dad_work(ifp);
1331
1332 ipv6_ifa_notify(RTM_DELADDR, ifp);
1333
1334 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1335
1336 if (action != CLEANUP_PREFIX_RT_NOP) {
1337 cleanup_prefix_route(ifp, expires,
1338 action == CLEANUP_PREFIX_RT_DEL, false);
1339 }
1340
1341 /* clean up prefsrc entries */
1342 rt6_remove_prefsrc(ifp);
1343 out:
1344 in6_ifa_put(ifp);
1345 }
1346
ipv6_create_tempaddr(struct inet6_ifaddr * ifp,bool block)1347 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1348 {
1349 struct inet6_dev *idev = ifp->idev;
1350 unsigned long tmp_tstamp, age;
1351 unsigned long regen_advance;
1352 unsigned long now = jiffies;
1353 s32 cnf_temp_preferred_lft;
1354 struct inet6_ifaddr *ift;
1355 struct ifa6_config cfg;
1356 long max_desync_factor;
1357 struct in6_addr addr;
1358 int ret = 0;
1359
1360 write_lock_bh(&idev->lock);
1361
1362 retry:
1363 in6_dev_hold(idev);
1364 if (idev->cnf.use_tempaddr <= 0) {
1365 write_unlock_bh(&idev->lock);
1366 pr_info("%s: use_tempaddr is disabled\n", __func__);
1367 in6_dev_put(idev);
1368 ret = -1;
1369 goto out;
1370 }
1371 spin_lock_bh(&ifp->lock);
1372 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1373 idev->cnf.use_tempaddr = -1; /*XXX*/
1374 spin_unlock_bh(&ifp->lock);
1375 write_unlock_bh(&idev->lock);
1376 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1377 __func__);
1378 in6_dev_put(idev);
1379 ret = -1;
1380 goto out;
1381 }
1382 in6_ifa_hold(ifp);
1383 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1384 ipv6_gen_rnd_iid(&addr);
1385
1386 age = (now - ifp->tstamp) / HZ;
1387
1388 regen_advance = idev->cnf.regen_max_retry *
1389 idev->cnf.dad_transmits *
1390 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1391
1392 /* recalculate max_desync_factor each time and update
1393 * idev->desync_factor if it's larger
1394 */
1395 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1396 max_desync_factor = min_t(long,
1397 idev->cnf.max_desync_factor,
1398 cnf_temp_preferred_lft - regen_advance);
1399
1400 if (unlikely(idev->desync_factor > max_desync_factor)) {
1401 if (max_desync_factor > 0) {
1402 get_random_bytes(&idev->desync_factor,
1403 sizeof(idev->desync_factor));
1404 idev->desync_factor %= max_desync_factor;
1405 } else {
1406 idev->desync_factor = 0;
1407 }
1408 }
1409
1410 memset(&cfg, 0, sizeof(cfg));
1411 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1412 idev->cnf.temp_valid_lft + age);
1413 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1414 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1415
1416 cfg.plen = ifp->prefix_len;
1417 tmp_tstamp = ifp->tstamp;
1418 spin_unlock_bh(&ifp->lock);
1419
1420 write_unlock_bh(&idev->lock);
1421
1422 /* A temporary address is created only if this calculated Preferred
1423 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1424 * an implementation must not create a temporary address with a zero
1425 * Preferred Lifetime.
1426 * Use age calculation as in addrconf_verify to avoid unnecessary
1427 * temporary addresses being generated.
1428 */
1429 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1430 if (cfg.preferred_lft <= regen_advance + age) {
1431 in6_ifa_put(ifp);
1432 in6_dev_put(idev);
1433 ret = -1;
1434 goto out;
1435 }
1436
1437 cfg.ifa_flags = IFA_F_TEMPORARY;
1438 /* set in addrconf_prefix_rcv() */
1439 if (ifp->flags & IFA_F_OPTIMISTIC)
1440 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1441
1442 cfg.pfx = &addr;
1443 cfg.scope = ipv6_addr_scope(cfg.pfx);
1444
1445 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1446 if (IS_ERR(ift)) {
1447 in6_ifa_put(ifp);
1448 in6_dev_put(idev);
1449 pr_info("%s: retry temporary address regeneration\n", __func__);
1450 write_lock_bh(&idev->lock);
1451 goto retry;
1452 }
1453
1454 spin_lock_bh(&ift->lock);
1455 ift->ifpub = ifp;
1456 ift->cstamp = now;
1457 ift->tstamp = tmp_tstamp;
1458 spin_unlock_bh(&ift->lock);
1459
1460 addrconf_dad_start(ift);
1461 in6_ifa_put(ift);
1462 in6_dev_put(idev);
1463 out:
1464 return ret;
1465 }
1466
1467 /*
1468 * Choose an appropriate source address (RFC3484)
1469 */
1470 enum {
1471 IPV6_SADDR_RULE_INIT = 0,
1472 IPV6_SADDR_RULE_LOCAL,
1473 IPV6_SADDR_RULE_SCOPE,
1474 IPV6_SADDR_RULE_PREFERRED,
1475 #ifdef CONFIG_IPV6_MIP6
1476 IPV6_SADDR_RULE_HOA,
1477 #endif
1478 IPV6_SADDR_RULE_OIF,
1479 IPV6_SADDR_RULE_LABEL,
1480 IPV6_SADDR_RULE_PRIVACY,
1481 IPV6_SADDR_RULE_ORCHID,
1482 IPV6_SADDR_RULE_PREFIX,
1483 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1484 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1485 #endif
1486 IPV6_SADDR_RULE_MAX
1487 };
1488
1489 struct ipv6_saddr_score {
1490 int rule;
1491 int addr_type;
1492 struct inet6_ifaddr *ifa;
1493 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1494 int scopedist;
1495 int matchlen;
1496 };
1497
1498 struct ipv6_saddr_dst {
1499 const struct in6_addr *addr;
1500 int ifindex;
1501 int scope;
1502 int label;
1503 unsigned int prefs;
1504 };
1505
ipv6_saddr_preferred(int type)1506 static inline int ipv6_saddr_preferred(int type)
1507 {
1508 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1509 return 1;
1510 return 0;
1511 }
1512
ipv6_use_optimistic_addr(struct net * net,struct inet6_dev * idev)1513 static bool ipv6_use_optimistic_addr(struct net *net,
1514 struct inet6_dev *idev)
1515 {
1516 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1517 if (!idev)
1518 return false;
1519 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1520 return false;
1521 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1522 return false;
1523
1524 return true;
1525 #else
1526 return false;
1527 #endif
1528 }
1529
ipv6_allow_optimistic_dad(struct net * net,struct inet6_dev * idev)1530 static bool ipv6_allow_optimistic_dad(struct net *net,
1531 struct inet6_dev *idev)
1532 {
1533 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1534 if (!idev)
1535 return false;
1536 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1537 return false;
1538
1539 return true;
1540 #else
1541 return false;
1542 #endif
1543 }
1544
ipv6_get_saddr_eval(struct net * net,struct ipv6_saddr_score * score,struct ipv6_saddr_dst * dst,int i)1545 static int ipv6_get_saddr_eval(struct net *net,
1546 struct ipv6_saddr_score *score,
1547 struct ipv6_saddr_dst *dst,
1548 int i)
1549 {
1550 int ret;
1551
1552 if (i <= score->rule) {
1553 switch (i) {
1554 case IPV6_SADDR_RULE_SCOPE:
1555 ret = score->scopedist;
1556 break;
1557 case IPV6_SADDR_RULE_PREFIX:
1558 ret = score->matchlen;
1559 break;
1560 default:
1561 ret = !!test_bit(i, score->scorebits);
1562 }
1563 goto out;
1564 }
1565
1566 switch (i) {
1567 case IPV6_SADDR_RULE_INIT:
1568 /* Rule 0: remember if hiscore is not ready yet */
1569 ret = !!score->ifa;
1570 break;
1571 case IPV6_SADDR_RULE_LOCAL:
1572 /* Rule 1: Prefer same address */
1573 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1574 break;
1575 case IPV6_SADDR_RULE_SCOPE:
1576 /* Rule 2: Prefer appropriate scope
1577 *
1578 * ret
1579 * ^
1580 * -1 | d 15
1581 * ---+--+-+---> scope
1582 * |
1583 * | d is scope of the destination.
1584 * B-d | \
1585 * | \ <- smaller scope is better if
1586 * B-15 | \ if scope is enough for destination.
1587 * | ret = B - scope (-1 <= scope >= d <= 15).
1588 * d-C-1 | /
1589 * |/ <- greater is better
1590 * -C / if scope is not enough for destination.
1591 * /| ret = scope - C (-1 <= d < scope <= 15).
1592 *
1593 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1594 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1595 * Assume B = 0 and we get C > 29.
1596 */
1597 ret = __ipv6_addr_src_scope(score->addr_type);
1598 if (ret >= dst->scope)
1599 ret = -ret;
1600 else
1601 ret -= 128; /* 30 is enough */
1602 score->scopedist = ret;
1603 break;
1604 case IPV6_SADDR_RULE_PREFERRED:
1605 {
1606 /* Rule 3: Avoid deprecated and optimistic addresses */
1607 u8 avoid = IFA_F_DEPRECATED;
1608
1609 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1610 avoid |= IFA_F_OPTIMISTIC;
1611 ret = ipv6_saddr_preferred(score->addr_type) ||
1612 !(score->ifa->flags & avoid);
1613 break;
1614 }
1615 #ifdef CONFIG_IPV6_MIP6
1616 case IPV6_SADDR_RULE_HOA:
1617 {
1618 /* Rule 4: Prefer home address */
1619 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1620 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1621 break;
1622 }
1623 #endif
1624 case IPV6_SADDR_RULE_OIF:
1625 /* Rule 5: Prefer outgoing interface */
1626 ret = (!dst->ifindex ||
1627 dst->ifindex == score->ifa->idev->dev->ifindex);
1628 break;
1629 case IPV6_SADDR_RULE_LABEL:
1630 /* Rule 6: Prefer matching label */
1631 ret = ipv6_addr_label(net,
1632 &score->ifa->addr, score->addr_type,
1633 score->ifa->idev->dev->ifindex) == dst->label;
1634 break;
1635 case IPV6_SADDR_RULE_PRIVACY:
1636 {
1637 /* Rule 7: Prefer public address
1638 * Note: prefer temporary address if use_tempaddr >= 2
1639 */
1640 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1641 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1642 score->ifa->idev->cnf.use_tempaddr >= 2;
1643 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1644 break;
1645 }
1646 case IPV6_SADDR_RULE_ORCHID:
1647 /* Rule 8-: Prefer ORCHID vs ORCHID or
1648 * non-ORCHID vs non-ORCHID
1649 */
1650 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1651 ipv6_addr_orchid(dst->addr));
1652 break;
1653 case IPV6_SADDR_RULE_PREFIX:
1654 /* Rule 8: Use longest matching prefix */
1655 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1656 if (ret > score->ifa->prefix_len)
1657 ret = score->ifa->prefix_len;
1658 score->matchlen = ret;
1659 break;
1660 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1661 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1662 /* Optimistic addresses still have lower precedence than other
1663 * preferred addresses.
1664 */
1665 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1666 break;
1667 #endif
1668 default:
1669 ret = 0;
1670 }
1671
1672 if (ret)
1673 __set_bit(i, score->scorebits);
1674 score->rule = i;
1675 out:
1676 return ret;
1677 }
1678
__ipv6_dev_get_saddr(struct net * net,struct ipv6_saddr_dst * dst,struct inet6_dev * idev,struct ipv6_saddr_score * scores,int hiscore_idx)1679 static int __ipv6_dev_get_saddr(struct net *net,
1680 struct ipv6_saddr_dst *dst,
1681 struct inet6_dev *idev,
1682 struct ipv6_saddr_score *scores,
1683 int hiscore_idx)
1684 {
1685 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1686
1687 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1688 int i;
1689
1690 /*
1691 * - Tentative Address (RFC2462 section 5.4)
1692 * - A tentative address is not considered
1693 * "assigned to an interface" in the traditional
1694 * sense, unless it is also flagged as optimistic.
1695 * - Candidate Source Address (section 4)
1696 * - In any case, anycast addresses, multicast
1697 * addresses, and the unspecified address MUST
1698 * NOT be included in a candidate set.
1699 */
1700 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1701 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1702 continue;
1703
1704 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1705
1706 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1707 score->addr_type & IPV6_ADDR_MULTICAST)) {
1708 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1709 idev->dev->name);
1710 continue;
1711 }
1712
1713 score->rule = -1;
1714 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1715
1716 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1717 int minihiscore, miniscore;
1718
1719 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1720 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1721
1722 if (minihiscore > miniscore) {
1723 if (i == IPV6_SADDR_RULE_SCOPE &&
1724 score->scopedist > 0) {
1725 /*
1726 * special case:
1727 * each remaining entry
1728 * has too small (not enough)
1729 * scope, because ifa entries
1730 * are sorted by their scope
1731 * values.
1732 */
1733 goto out;
1734 }
1735 break;
1736 } else if (minihiscore < miniscore) {
1737 swap(hiscore, score);
1738 hiscore_idx = 1 - hiscore_idx;
1739
1740 /* restore our iterator */
1741 score->ifa = hiscore->ifa;
1742
1743 break;
1744 }
1745 }
1746 }
1747 out:
1748 return hiscore_idx;
1749 }
1750
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)1751 static int ipv6_get_saddr_master(struct net *net,
1752 const struct net_device *dst_dev,
1753 const struct net_device *master,
1754 struct ipv6_saddr_dst *dst,
1755 struct ipv6_saddr_score *scores,
1756 int hiscore_idx)
1757 {
1758 struct inet6_dev *idev;
1759
1760 idev = __in6_dev_get(dst_dev);
1761 if (idev)
1762 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1763 scores, hiscore_idx);
1764
1765 idev = __in6_dev_get(master);
1766 if (idev)
1767 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1768 scores, hiscore_idx);
1769
1770 return hiscore_idx;
1771 }
1772
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)1773 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1774 const struct in6_addr *daddr, unsigned int prefs,
1775 struct in6_addr *saddr)
1776 {
1777 struct ipv6_saddr_score scores[2], *hiscore;
1778 struct ipv6_saddr_dst dst;
1779 struct inet6_dev *idev;
1780 struct net_device *dev;
1781 int dst_type;
1782 bool use_oif_addr = false;
1783 int hiscore_idx = 0;
1784 int ret = 0;
1785
1786 dst_type = __ipv6_addr_type(daddr);
1787 dst.addr = daddr;
1788 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1789 dst.scope = __ipv6_addr_src_scope(dst_type);
1790 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1791 dst.prefs = prefs;
1792
1793 scores[hiscore_idx].rule = -1;
1794 scores[hiscore_idx].ifa = NULL;
1795
1796 rcu_read_lock();
1797
1798 /* Candidate Source Address (section 4)
1799 * - multicast and link-local destination address,
1800 * the set of candidate source address MUST only
1801 * include addresses assigned to interfaces
1802 * belonging to the same link as the outgoing
1803 * interface.
1804 * (- For site-local destination addresses, the
1805 * set of candidate source addresses MUST only
1806 * include addresses assigned to interfaces
1807 * belonging to the same site as the outgoing
1808 * interface.)
1809 * - "It is RECOMMENDED that the candidate source addresses
1810 * be the set of unicast addresses assigned to the
1811 * interface that will be used to send to the destination
1812 * (the 'outgoing' interface)." (RFC 6724)
1813 */
1814 if (dst_dev) {
1815 idev = __in6_dev_get(dst_dev);
1816 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1817 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1818 (idev && idev->cnf.use_oif_addrs_only)) {
1819 use_oif_addr = true;
1820 }
1821 }
1822
1823 if (use_oif_addr) {
1824 if (idev)
1825 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1826 } else {
1827 const struct net_device *master;
1828 int master_idx = 0;
1829
1830 /* if dst_dev exists and is enslaved to an L3 device, then
1831 * prefer addresses from dst_dev and then the master over
1832 * any other enslaved devices in the L3 domain.
1833 */
1834 master = l3mdev_master_dev_rcu(dst_dev);
1835 if (master) {
1836 master_idx = master->ifindex;
1837
1838 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1839 master, &dst,
1840 scores, hiscore_idx);
1841
1842 if (scores[hiscore_idx].ifa &&
1843 scores[hiscore_idx].scopedist >= 0)
1844 goto out;
1845 }
1846
1847 for_each_netdev_rcu(net, dev) {
1848 /* only consider addresses on devices in the
1849 * same L3 domain
1850 */
1851 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1852 continue;
1853 idev = __in6_dev_get(dev);
1854 if (!idev)
1855 continue;
1856 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1857 }
1858 }
1859
1860 out:
1861 hiscore = &scores[hiscore_idx];
1862 if (!hiscore->ifa)
1863 ret = -EADDRNOTAVAIL;
1864 else
1865 *saddr = hiscore->ifa->addr;
1866
1867 rcu_read_unlock();
1868 return ret;
1869 }
1870 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1871
__ipv6_get_lladdr(struct inet6_dev * idev,struct in6_addr * addr,u32 banned_flags)1872 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1873 u32 banned_flags)
1874 {
1875 struct inet6_ifaddr *ifp;
1876 int err = -EADDRNOTAVAIL;
1877
1878 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1879 if (ifp->scope > IFA_LINK)
1880 break;
1881 if (ifp->scope == IFA_LINK &&
1882 !(ifp->flags & banned_flags)) {
1883 *addr = ifp->addr;
1884 err = 0;
1885 break;
1886 }
1887 }
1888 return err;
1889 }
1890
ipv6_get_lladdr(struct net_device * dev,struct in6_addr * addr,u32 banned_flags)1891 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1892 u32 banned_flags)
1893 {
1894 struct inet6_dev *idev;
1895 int err = -EADDRNOTAVAIL;
1896
1897 rcu_read_lock();
1898 idev = __in6_dev_get(dev);
1899 if (idev) {
1900 read_lock_bh(&idev->lock);
1901 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1902 read_unlock_bh(&idev->lock);
1903 }
1904 rcu_read_unlock();
1905 return err;
1906 }
1907
ipv6_count_addresses(const struct inet6_dev * idev)1908 static int ipv6_count_addresses(const struct inet6_dev *idev)
1909 {
1910 const struct inet6_ifaddr *ifp;
1911 int cnt = 0;
1912
1913 rcu_read_lock();
1914 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1915 cnt++;
1916 rcu_read_unlock();
1917 return cnt;
1918 }
1919
ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)1920 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1921 const struct net_device *dev, int strict)
1922 {
1923 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1924 strict, IFA_F_TENTATIVE);
1925 }
1926 EXPORT_SYMBOL(ipv6_chk_addr);
1927
1928 /* device argument is used to find the L3 domain of interest. If
1929 * skip_dev_check is set, then the ifp device is not checked against
1930 * the passed in dev argument. So the 2 cases for addresses checks are:
1931 * 1. does the address exist in the L3 domain that dev is part of
1932 * (skip_dev_check = true), or
1933 *
1934 * 2. does the address exist on the specific device
1935 * (skip_dev_check = false)
1936 */
1937 static struct net_device *
__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)1938 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1939 const struct net_device *dev, bool skip_dev_check,
1940 int strict, u32 banned_flags)
1941 {
1942 unsigned int hash = inet6_addr_hash(net, addr);
1943 struct net_device *l3mdev, *ndev;
1944 struct inet6_ifaddr *ifp;
1945 u32 ifp_flags;
1946
1947 rcu_read_lock();
1948
1949 l3mdev = l3mdev_master_dev_rcu(dev);
1950 if (skip_dev_check)
1951 dev = NULL;
1952
1953 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1954 ndev = ifp->idev->dev;
1955
1956 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1957 continue;
1958
1959 /* Decouple optimistic from tentative for evaluation here.
1960 * Ban optimistic addresses explicitly, when required.
1961 */
1962 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1963 ? (ifp->flags&~IFA_F_TENTATIVE)
1964 : ifp->flags;
1965 if (ipv6_addr_equal(&ifp->addr, addr) &&
1966 !(ifp_flags&banned_flags) &&
1967 (!dev || ndev == dev ||
1968 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1969 rcu_read_unlock();
1970 return ndev;
1971 }
1972 }
1973
1974 rcu_read_unlock();
1975 return NULL;
1976 }
1977
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)1978 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1979 const struct net_device *dev, bool skip_dev_check,
1980 int strict, u32 banned_flags)
1981 {
1982 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1983 strict, banned_flags) ? 1 : 0;
1984 }
1985 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1986
1987
1988 /* Compares an address/prefix_len with addresses on device @dev.
1989 * If one is found it returns true.
1990 */
ipv6_chk_custom_prefix(const struct in6_addr * addr,const unsigned int prefix_len,struct net_device * dev)1991 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1992 const unsigned int prefix_len, struct net_device *dev)
1993 {
1994 const struct inet6_ifaddr *ifa;
1995 const struct inet6_dev *idev;
1996 bool ret = false;
1997
1998 rcu_read_lock();
1999 idev = __in6_dev_get(dev);
2000 if (idev) {
2001 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2002 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2003 if (ret)
2004 break;
2005 }
2006 }
2007 rcu_read_unlock();
2008
2009 return ret;
2010 }
2011 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2012
ipv6_chk_prefix(const struct in6_addr * addr,struct net_device * dev)2013 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2014 {
2015 const struct inet6_ifaddr *ifa;
2016 const struct inet6_dev *idev;
2017 int onlink;
2018
2019 onlink = 0;
2020 rcu_read_lock();
2021 idev = __in6_dev_get(dev);
2022 if (idev) {
2023 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2024 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2025 ifa->prefix_len);
2026 if (onlink)
2027 break;
2028 }
2029 }
2030 rcu_read_unlock();
2031 return onlink;
2032 }
2033 EXPORT_SYMBOL(ipv6_chk_prefix);
2034
2035 /**
2036 * ipv6_dev_find - find the first device with a given source address.
2037 * @net: the net namespace
2038 * @addr: the source address
2039 * @dev: used to find the L3 domain of interest
2040 *
2041 * The caller should be protected by RCU, or RTNL.
2042 */
ipv6_dev_find(struct net * net,const struct in6_addr * addr,struct net_device * dev)2043 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2044 struct net_device *dev)
2045 {
2046 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2047 IFA_F_TENTATIVE);
2048 }
2049 EXPORT_SYMBOL(ipv6_dev_find);
2050
ipv6_get_ifaddr(struct net * net,const struct in6_addr * addr,struct net_device * dev,int strict)2051 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2052 struct net_device *dev, int strict)
2053 {
2054 unsigned int hash = inet6_addr_hash(net, addr);
2055 struct inet6_ifaddr *ifp, *result = NULL;
2056
2057 rcu_read_lock();
2058 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2059 if (ipv6_addr_equal(&ifp->addr, addr)) {
2060 if (!dev || ifp->idev->dev == dev ||
2061 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2062 if (in6_ifa_hold_safe(ifp)) {
2063 result = ifp;
2064 break;
2065 }
2066 }
2067 }
2068 }
2069 rcu_read_unlock();
2070
2071 return result;
2072 }
2073
2074 /* Gets referenced address, destroys ifaddr */
2075
addrconf_dad_stop(struct inet6_ifaddr * ifp,int dad_failed)2076 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2077 {
2078 if (dad_failed)
2079 ifp->flags |= IFA_F_DADFAILED;
2080
2081 if (ifp->flags&IFA_F_TEMPORARY) {
2082 struct inet6_ifaddr *ifpub;
2083 spin_lock_bh(&ifp->lock);
2084 ifpub = ifp->ifpub;
2085 if (ifpub) {
2086 in6_ifa_hold(ifpub);
2087 spin_unlock_bh(&ifp->lock);
2088 ipv6_create_tempaddr(ifpub, true);
2089 in6_ifa_put(ifpub);
2090 } else {
2091 spin_unlock_bh(&ifp->lock);
2092 }
2093 ipv6_del_addr(ifp);
2094 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2095 spin_lock_bh(&ifp->lock);
2096 addrconf_del_dad_work(ifp);
2097 ifp->flags |= IFA_F_TENTATIVE;
2098 if (dad_failed)
2099 ifp->flags &= ~IFA_F_OPTIMISTIC;
2100 spin_unlock_bh(&ifp->lock);
2101 if (dad_failed)
2102 ipv6_ifa_notify(0, ifp);
2103 in6_ifa_put(ifp);
2104 } else {
2105 ipv6_del_addr(ifp);
2106 }
2107 }
2108
addrconf_dad_end(struct inet6_ifaddr * ifp)2109 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2110 {
2111 int err = -ENOENT;
2112
2113 spin_lock_bh(&ifp->lock);
2114 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2115 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2116 err = 0;
2117 }
2118 spin_unlock_bh(&ifp->lock);
2119
2120 return err;
2121 }
2122
addrconf_dad_failure(struct sk_buff * skb,struct inet6_ifaddr * ifp)2123 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2124 {
2125 struct inet6_dev *idev = ifp->idev;
2126 struct net *net = dev_net(idev->dev);
2127
2128 if (addrconf_dad_end(ifp)) {
2129 in6_ifa_put(ifp);
2130 return;
2131 }
2132
2133 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2134 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2135
2136 spin_lock_bh(&ifp->lock);
2137
2138 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2139 struct in6_addr new_addr;
2140 struct inet6_ifaddr *ifp2;
2141 int retries = ifp->stable_privacy_retry + 1;
2142 struct ifa6_config cfg = {
2143 .pfx = &new_addr,
2144 .plen = ifp->prefix_len,
2145 .ifa_flags = ifp->flags,
2146 .valid_lft = ifp->valid_lft,
2147 .preferred_lft = ifp->prefered_lft,
2148 .scope = ifp->scope,
2149 };
2150
2151 if (retries > net->ipv6.sysctl.idgen_retries) {
2152 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2153 ifp->idev->dev->name);
2154 goto errdad;
2155 }
2156
2157 new_addr = ifp->addr;
2158 if (ipv6_generate_stable_address(&new_addr, retries,
2159 idev))
2160 goto errdad;
2161
2162 spin_unlock_bh(&ifp->lock);
2163
2164 if (idev->cnf.max_addresses &&
2165 ipv6_count_addresses(idev) >=
2166 idev->cnf.max_addresses)
2167 goto lock_errdad;
2168
2169 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2170 ifp->idev->dev->name);
2171
2172 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2173 if (IS_ERR(ifp2))
2174 goto lock_errdad;
2175
2176 spin_lock_bh(&ifp2->lock);
2177 ifp2->stable_privacy_retry = retries;
2178 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2179 spin_unlock_bh(&ifp2->lock);
2180
2181 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2182 in6_ifa_put(ifp2);
2183 lock_errdad:
2184 spin_lock_bh(&ifp->lock);
2185 }
2186
2187 errdad:
2188 /* transition from _POSTDAD to _ERRDAD */
2189 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2190 spin_unlock_bh(&ifp->lock);
2191
2192 addrconf_mod_dad_work(ifp, 0);
2193 in6_ifa_put(ifp);
2194 }
2195
2196 /* Join to solicited addr multicast group.
2197 * caller must hold RTNL */
addrconf_join_solict(struct net_device * dev,const struct in6_addr * addr)2198 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2199 {
2200 struct in6_addr maddr;
2201
2202 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2203 return;
2204
2205 addrconf_addr_solict_mult(addr, &maddr);
2206 ipv6_dev_mc_inc(dev, &maddr);
2207 }
2208
2209 /* caller must hold RTNL */
addrconf_leave_solict(struct inet6_dev * idev,const struct in6_addr * addr)2210 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2211 {
2212 struct in6_addr maddr;
2213
2214 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2215 return;
2216
2217 addrconf_addr_solict_mult(addr, &maddr);
2218 __ipv6_dev_mc_dec(idev, &maddr);
2219 }
2220
2221 /* caller must hold RTNL */
addrconf_join_anycast(struct inet6_ifaddr * ifp)2222 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2223 {
2224 struct in6_addr addr;
2225
2226 if (ifp->prefix_len >= 127) /* RFC 6164 */
2227 return;
2228 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2229 if (ipv6_addr_any(&addr))
2230 return;
2231 __ipv6_dev_ac_inc(ifp->idev, &addr);
2232 }
2233
2234 /* caller must hold RTNL */
addrconf_leave_anycast(struct inet6_ifaddr * ifp)2235 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2236 {
2237 struct in6_addr addr;
2238
2239 if (ifp->prefix_len >= 127) /* RFC 6164 */
2240 return;
2241 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2242 if (ipv6_addr_any(&addr))
2243 return;
2244 __ipv6_dev_ac_dec(ifp->idev, &addr);
2245 }
2246
addrconf_ifid_6lowpan(u8 * eui,struct net_device * dev)2247 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2248 {
2249 switch (dev->addr_len) {
2250 case ETH_ALEN:
2251 memcpy(eui, dev->dev_addr, 3);
2252 eui[3] = 0xFF;
2253 eui[4] = 0xFE;
2254 memcpy(eui + 5, dev->dev_addr + 3, 3);
2255 break;
2256 case EUI64_ADDR_LEN:
2257 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2258 eui[0] ^= 2;
2259 break;
2260 default:
2261 return -1;
2262 }
2263
2264 return 0;
2265 }
2266
addrconf_ifid_ieee1394(u8 * eui,struct net_device * dev)2267 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2268 {
2269 const union fwnet_hwaddr *ha;
2270
2271 if (dev->addr_len != FWNET_ALEN)
2272 return -1;
2273
2274 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2275
2276 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2277 eui[0] ^= 2;
2278 return 0;
2279 }
2280
addrconf_ifid_arcnet(u8 * eui,struct net_device * dev)2281 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2282 {
2283 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2284 if (dev->addr_len != ARCNET_ALEN)
2285 return -1;
2286 memset(eui, 0, 7);
2287 eui[7] = *(u8 *)dev->dev_addr;
2288 return 0;
2289 }
2290
addrconf_ifid_infiniband(u8 * eui,struct net_device * dev)2291 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2292 {
2293 if (dev->addr_len != INFINIBAND_ALEN)
2294 return -1;
2295 memcpy(eui, dev->dev_addr + 12, 8);
2296 eui[0] |= 2;
2297 return 0;
2298 }
2299
__ipv6_isatap_ifid(u8 * eui,__be32 addr)2300 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2301 {
2302 if (addr == 0)
2303 return -1;
2304 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2305 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2306 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2307 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2308 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2309 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2310 eui[1] = 0;
2311 eui[2] = 0x5E;
2312 eui[3] = 0xFE;
2313 memcpy(eui + 4, &addr, 4);
2314 return 0;
2315 }
2316
addrconf_ifid_sit(u8 * eui,struct net_device * dev)2317 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2318 {
2319 if (dev->priv_flags & IFF_ISATAP)
2320 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2321 return -1;
2322 }
2323
addrconf_ifid_gre(u8 * eui,struct net_device * dev)2324 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2325 {
2326 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2327 }
2328
addrconf_ifid_ip6tnl(u8 * eui,struct net_device * dev)2329 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2330 {
2331 memcpy(eui, dev->perm_addr, 3);
2332 memcpy(eui + 5, dev->perm_addr + 3, 3);
2333 eui[3] = 0xFF;
2334 eui[4] = 0xFE;
2335 eui[0] ^= 2;
2336 return 0;
2337 }
2338
ipv6_generate_eui64(u8 * eui,struct net_device * dev)2339 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2340 {
2341 switch (dev->type) {
2342 case ARPHRD_ETHER:
2343 case ARPHRD_FDDI:
2344 return addrconf_ifid_eui48(eui, dev);
2345 case ARPHRD_ARCNET:
2346 return addrconf_ifid_arcnet(eui, dev);
2347 case ARPHRD_INFINIBAND:
2348 return addrconf_ifid_infiniband(eui, dev);
2349 case ARPHRD_SIT:
2350 return addrconf_ifid_sit(eui, dev);
2351 case ARPHRD_IPGRE:
2352 case ARPHRD_TUNNEL:
2353 return addrconf_ifid_gre(eui, dev);
2354 case ARPHRD_6LOWPAN:
2355 return addrconf_ifid_6lowpan(eui, dev);
2356 case ARPHRD_IEEE1394:
2357 return addrconf_ifid_ieee1394(eui, dev);
2358 case ARPHRD_TUNNEL6:
2359 case ARPHRD_IP6GRE:
2360 case ARPHRD_RAWIP:
2361 return addrconf_ifid_ip6tnl(eui, dev);
2362 }
2363 return -1;
2364 }
2365
ipv6_inherit_eui64(u8 * eui,struct inet6_dev * idev)2366 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2367 {
2368 int err = -1;
2369 struct inet6_ifaddr *ifp;
2370
2371 read_lock_bh(&idev->lock);
2372 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2373 if (ifp->scope > IFA_LINK)
2374 break;
2375 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2376 memcpy(eui, ifp->addr.s6_addr+8, 8);
2377 err = 0;
2378 break;
2379 }
2380 }
2381 read_unlock_bh(&idev->lock);
2382 return err;
2383 }
2384
2385 /* Generation of a randomized Interface Identifier
2386 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2387 */
2388
ipv6_gen_rnd_iid(struct in6_addr * addr)2389 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2390 {
2391 regen:
2392 get_random_bytes(&addr->s6_addr[8], 8);
2393
2394 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2395 * check if generated address is not inappropriate:
2396 *
2397 * - Reserved IPv6 Interface Identifiers
2398 * - XXX: already assigned to an address on the device
2399 */
2400
2401 /* Subnet-router anycast: 0000:0000:0000:0000 */
2402 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2403 goto regen;
2404
2405 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2406 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2407 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2408 */
2409 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2410 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2411 goto regen;
2412
2413 /* Reserved subnet anycast addresses */
2414 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2415 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2416 goto regen;
2417 }
2418
2419 /*
2420 * Add prefix route.
2421 */
2422
2423 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)2424 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2425 struct net_device *dev, unsigned long expires,
2426 u32 flags, gfp_t gfp_flags)
2427 {
2428 struct fib6_config cfg = {
2429 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2430 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2431 .fc_ifindex = dev->ifindex,
2432 .fc_expires = expires,
2433 .fc_dst_len = plen,
2434 .fc_flags = RTF_UP | flags,
2435 .fc_nlinfo.nl_net = dev_net(dev),
2436 .fc_protocol = RTPROT_KERNEL,
2437 .fc_type = RTN_UNICAST,
2438 };
2439
2440 cfg.fc_dst = *pfx;
2441
2442 /* Prevent useless cloning on PtP SIT.
2443 This thing is done here expecting that the whole
2444 class of non-broadcast devices need not cloning.
2445 */
2446 #if IS_ENABLED(CONFIG_IPV6_SIT)
2447 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2448 cfg.fc_flags |= RTF_NONEXTHOP;
2449 #endif
2450
2451 ip6_route_add(&cfg, gfp_flags, NULL);
2452 }
2453
2454
addrconf_get_prefix_route(const struct in6_addr * pfx,int plen,const struct net_device * dev,u32 flags,u32 noflags,bool no_gw)2455 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2456 int plen,
2457 const struct net_device *dev,
2458 u32 flags, u32 noflags,
2459 bool no_gw)
2460 {
2461 struct fib6_node *fn;
2462 struct fib6_info *rt = NULL;
2463 struct fib6_table *table;
2464 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2465
2466 table = fib6_get_table(dev_net(dev), tb_id);
2467 if (!table)
2468 return NULL;
2469
2470 rcu_read_lock();
2471 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2472 if (!fn)
2473 goto out;
2474
2475 for_each_fib6_node_rt_rcu(fn) {
2476 /* prefix routes only use builtin fib6_nh */
2477 if (rt->nh)
2478 continue;
2479
2480 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2481 continue;
2482 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2483 continue;
2484 if ((rt->fib6_flags & flags) != flags)
2485 continue;
2486 if ((rt->fib6_flags & noflags) != 0)
2487 continue;
2488 if (!fib6_info_hold_safe(rt))
2489 continue;
2490 break;
2491 }
2492 out:
2493 rcu_read_unlock();
2494 return rt;
2495 }
2496
2497
2498 /* Create "default" multicast route to the interface */
2499
addrconf_add_mroute(struct net_device * dev)2500 static void addrconf_add_mroute(struct net_device *dev)
2501 {
2502 struct fib6_config cfg = {
2503 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2504 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2505 .fc_ifindex = dev->ifindex,
2506 .fc_dst_len = 8,
2507 .fc_flags = RTF_UP,
2508 .fc_type = RTN_MULTICAST,
2509 .fc_nlinfo.nl_net = dev_net(dev),
2510 .fc_protocol = RTPROT_KERNEL,
2511 };
2512
2513 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2514
2515 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2516 }
2517
addrconf_add_dev(struct net_device * dev)2518 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2519 {
2520 struct inet6_dev *idev;
2521
2522 ASSERT_RTNL();
2523
2524 idev = ipv6_find_idev(dev);
2525 if (IS_ERR(idev))
2526 return idev;
2527
2528 if (idev->cnf.disable_ipv6)
2529 return ERR_PTR(-EACCES);
2530
2531 /* Add default multicast route */
2532 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2533 addrconf_add_mroute(dev);
2534
2535 return idev;
2536 }
2537
delete_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp)2538 static void delete_tempaddrs(struct inet6_dev *idev,
2539 struct inet6_ifaddr *ifp)
2540 {
2541 struct inet6_ifaddr *ift, *tmp;
2542
2543 write_lock_bh(&idev->lock);
2544 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) {
2545 if (ift->ifpub != ifp)
2546 continue;
2547
2548 in6_ifa_hold(ift);
2549 write_unlock_bh(&idev->lock);
2550 ipv6_del_addr(ift);
2551 write_lock_bh(&idev->lock);
2552 }
2553 write_unlock_bh(&idev->lock);
2554 }
2555
manage_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp,__u32 valid_lft,__u32 prefered_lft,bool create,unsigned long now)2556 static void manage_tempaddrs(struct inet6_dev *idev,
2557 struct inet6_ifaddr *ifp,
2558 __u32 valid_lft, __u32 prefered_lft,
2559 bool create, unsigned long now)
2560 {
2561 u32 flags;
2562 struct inet6_ifaddr *ift;
2563
2564 read_lock_bh(&idev->lock);
2565 /* update all temporary addresses in the list */
2566 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2567 int age, max_valid, max_prefered;
2568
2569 if (ifp != ift->ifpub)
2570 continue;
2571
2572 /* RFC 4941 section 3.3:
2573 * If a received option will extend the lifetime of a public
2574 * address, the lifetimes of temporary addresses should
2575 * be extended, subject to the overall constraint that no
2576 * temporary addresses should ever remain "valid" or "preferred"
2577 * for a time longer than (TEMP_VALID_LIFETIME) or
2578 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2579 */
2580 age = (now - ift->cstamp) / HZ;
2581 max_valid = idev->cnf.temp_valid_lft - age;
2582 if (max_valid < 0)
2583 max_valid = 0;
2584
2585 max_prefered = idev->cnf.temp_prefered_lft -
2586 idev->desync_factor - age;
2587 if (max_prefered < 0)
2588 max_prefered = 0;
2589
2590 if (valid_lft > max_valid)
2591 valid_lft = max_valid;
2592
2593 if (prefered_lft > max_prefered)
2594 prefered_lft = max_prefered;
2595
2596 spin_lock(&ift->lock);
2597 flags = ift->flags;
2598 ift->valid_lft = valid_lft;
2599 ift->prefered_lft = prefered_lft;
2600 ift->tstamp = now;
2601 if (prefered_lft > 0)
2602 ift->flags &= ~IFA_F_DEPRECATED;
2603
2604 spin_unlock(&ift->lock);
2605 if (!(flags&IFA_F_TENTATIVE))
2606 ipv6_ifa_notify(0, ift);
2607 }
2608
2609 /* Also create a temporary address if it's enabled but no temporary
2610 * address currently exists.
2611 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2612 * as part of cleanup (ie. deleting the mngtmpaddr).
2613 * We don't want that to result in creating a new temporary ip address.
2614 */
2615 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2616 create = true;
2617
2618 if (create && idev->cnf.use_tempaddr > 0) {
2619 /* When a new public address is created as described
2620 * in [ADDRCONF], also create a new temporary address.
2621 */
2622 read_unlock_bh(&idev->lock);
2623 ipv6_create_tempaddr(ifp, false);
2624 } else {
2625 read_unlock_bh(&idev->lock);
2626 }
2627 }
2628
is_addr_mode_generate_stable(struct inet6_dev * idev)2629 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2630 {
2631 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2632 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2633 }
2634
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)2635 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2636 const struct prefix_info *pinfo,
2637 struct inet6_dev *in6_dev,
2638 const struct in6_addr *addr, int addr_type,
2639 u32 addr_flags, bool sllao, bool tokenized,
2640 __u32 valid_lft, u32 prefered_lft)
2641 {
2642 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2643 int create = 0, update_lft = 0;
2644
2645 if (!ifp && valid_lft) {
2646 int max_addresses = in6_dev->cnf.max_addresses;
2647 struct ifa6_config cfg = {
2648 .pfx = addr,
2649 .plen = pinfo->prefix_len,
2650 .ifa_flags = addr_flags,
2651 .valid_lft = valid_lft,
2652 .preferred_lft = prefered_lft,
2653 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2654 .ifa_proto = IFAPROT_KERNEL_RA
2655 };
2656
2657 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2658 if ((net->ipv6.devconf_all->optimistic_dad ||
2659 in6_dev->cnf.optimistic_dad) &&
2660 !net->ipv6.devconf_all->forwarding && sllao)
2661 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2662 #endif
2663
2664 /* Do not allow to create too much of autoconfigured
2665 * addresses; this would be too easy way to crash kernel.
2666 */
2667 if (!max_addresses ||
2668 ipv6_count_addresses(in6_dev) < max_addresses)
2669 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2670
2671 if (IS_ERR_OR_NULL(ifp))
2672 return -1;
2673
2674 create = 1;
2675 spin_lock_bh(&ifp->lock);
2676 ifp->flags |= IFA_F_MANAGETEMPADDR;
2677 ifp->cstamp = jiffies;
2678 ifp->tokenized = tokenized;
2679 spin_unlock_bh(&ifp->lock);
2680 addrconf_dad_start(ifp);
2681 }
2682
2683 if (ifp) {
2684 u32 flags;
2685 unsigned long now;
2686 u32 stored_lft;
2687
2688 /* update lifetime (RFC2462 5.5.3 e) */
2689 spin_lock_bh(&ifp->lock);
2690 now = jiffies;
2691 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2692 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2693 else
2694 stored_lft = 0;
2695 if (!create && stored_lft) {
2696 const u32 minimum_lft = min_t(u32,
2697 stored_lft, MIN_VALID_LIFETIME);
2698 valid_lft = max(valid_lft, minimum_lft);
2699
2700 /* RFC4862 Section 5.5.3e:
2701 * "Note that the preferred lifetime of the
2702 * corresponding address is always reset to
2703 * the Preferred Lifetime in the received
2704 * Prefix Information option, regardless of
2705 * whether the valid lifetime is also reset or
2706 * ignored."
2707 *
2708 * So we should always update prefered_lft here.
2709 */
2710 update_lft = 1;
2711 }
2712
2713 if (update_lft) {
2714 ifp->valid_lft = valid_lft;
2715 ifp->prefered_lft = prefered_lft;
2716 ifp->tstamp = now;
2717 flags = ifp->flags;
2718 ifp->flags &= ~IFA_F_DEPRECATED;
2719 spin_unlock_bh(&ifp->lock);
2720
2721 if (!(flags&IFA_F_TENTATIVE))
2722 ipv6_ifa_notify(0, ifp);
2723 } else
2724 spin_unlock_bh(&ifp->lock);
2725
2726 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2727 create, now);
2728
2729 in6_ifa_put(ifp);
2730 addrconf_verify(net);
2731 }
2732
2733 return 0;
2734 }
2735 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2736
addrconf_prefix_rcv(struct net_device * dev,u8 * opt,int len,bool sllao)2737 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2738 {
2739 struct prefix_info *pinfo;
2740 __u32 valid_lft;
2741 __u32 prefered_lft;
2742 int addr_type, err;
2743 u32 addr_flags = 0;
2744 struct inet6_dev *in6_dev;
2745 struct net *net = dev_net(dev);
2746
2747 pinfo = (struct prefix_info *) opt;
2748
2749 if (len < sizeof(struct prefix_info)) {
2750 netdev_dbg(dev, "addrconf: prefix option too short\n");
2751 return;
2752 }
2753
2754 /*
2755 * Validation checks ([ADDRCONF], page 19)
2756 */
2757
2758 addr_type = ipv6_addr_type(&pinfo->prefix);
2759
2760 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2761 return;
2762
2763 valid_lft = ntohl(pinfo->valid);
2764 prefered_lft = ntohl(pinfo->prefered);
2765
2766 if (prefered_lft > valid_lft) {
2767 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2768 return;
2769 }
2770
2771 in6_dev = in6_dev_get(dev);
2772
2773 if (!in6_dev) {
2774 net_dbg_ratelimited("addrconf: device %s not configured\n",
2775 dev->name);
2776 return;
2777 }
2778
2779 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2780 goto put;
2781
2782 /*
2783 * Two things going on here:
2784 * 1) Add routes for on-link prefixes
2785 * 2) Configure prefixes with the auto flag set
2786 */
2787
2788 if (pinfo->onlink) {
2789 struct fib6_info *rt;
2790 unsigned long rt_expires;
2791
2792 /* Avoid arithmetic overflow. Really, we could
2793 * save rt_expires in seconds, likely valid_lft,
2794 * but it would require division in fib gc, that it
2795 * not good.
2796 */
2797 if (HZ > USER_HZ)
2798 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2799 else
2800 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2801
2802 if (addrconf_finite_timeout(rt_expires))
2803 rt_expires *= HZ;
2804
2805 rt = addrconf_get_prefix_route(&pinfo->prefix,
2806 pinfo->prefix_len,
2807 dev,
2808 RTF_ADDRCONF | RTF_PREFIX_RT,
2809 RTF_DEFAULT, true);
2810
2811 if (rt) {
2812 /* Autoconf prefix route */
2813 if (valid_lft == 0) {
2814 ip6_del_rt(net, rt, false);
2815 rt = NULL;
2816 } else if (addrconf_finite_timeout(rt_expires)) {
2817 /* not infinity */
2818 fib6_set_expires(rt, jiffies + rt_expires);
2819 } else {
2820 fib6_clean_expires(rt);
2821 }
2822 } else if (valid_lft) {
2823 clock_t expires = 0;
2824 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2825 if (addrconf_finite_timeout(rt_expires)) {
2826 /* not infinity */
2827 flags |= RTF_EXPIRES;
2828 expires = jiffies_to_clock_t(rt_expires);
2829 }
2830 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2831 0, dev, expires, flags,
2832 GFP_ATOMIC);
2833 }
2834 fib6_info_release(rt);
2835 }
2836
2837 /* Try to figure out our local address for this prefix */
2838
2839 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2840 struct in6_addr addr;
2841 bool tokenized = false, dev_addr_generated = false;
2842
2843 if (pinfo->prefix_len == 64) {
2844 memcpy(&addr, &pinfo->prefix, 8);
2845
2846 if (!ipv6_addr_any(&in6_dev->token)) {
2847 read_lock_bh(&in6_dev->lock);
2848 memcpy(addr.s6_addr + 8,
2849 in6_dev->token.s6_addr + 8, 8);
2850 read_unlock_bh(&in6_dev->lock);
2851 tokenized = true;
2852 } else if (is_addr_mode_generate_stable(in6_dev) &&
2853 !ipv6_generate_stable_address(&addr, 0,
2854 in6_dev)) {
2855 addr_flags |= IFA_F_STABLE_PRIVACY;
2856 goto ok;
2857 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2858 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2859 goto put;
2860 } else {
2861 dev_addr_generated = true;
2862 }
2863 goto ok;
2864 }
2865 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2866 pinfo->prefix_len);
2867 goto put;
2868
2869 ok:
2870 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2871 &addr, addr_type,
2872 addr_flags, sllao,
2873 tokenized, valid_lft,
2874 prefered_lft);
2875 if (err)
2876 goto put;
2877
2878 /* Ignore error case here because previous prefix add addr was
2879 * successful which will be notified.
2880 */
2881 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2882 addr_type, addr_flags, sllao,
2883 tokenized, valid_lft,
2884 prefered_lft,
2885 dev_addr_generated);
2886 }
2887 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2888 put:
2889 in6_dev_put(in6_dev);
2890 }
2891
addrconf_set_sit_dstaddr(struct net * net,struct net_device * dev,struct in6_ifreq * ireq)2892 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2893 struct in6_ifreq *ireq)
2894 {
2895 struct ip_tunnel_parm p = { };
2896 int err;
2897
2898 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2899 return -EADDRNOTAVAIL;
2900
2901 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2902 p.iph.version = 4;
2903 p.iph.ihl = 5;
2904 p.iph.protocol = IPPROTO_IPV6;
2905 p.iph.ttl = 64;
2906
2907 if (!dev->netdev_ops->ndo_tunnel_ctl)
2908 return -EOPNOTSUPP;
2909 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2910 if (err)
2911 return err;
2912
2913 dev = __dev_get_by_name(net, p.name);
2914 if (!dev)
2915 return -ENOBUFS;
2916 return dev_open(dev, NULL);
2917 }
2918
2919 /*
2920 * Set destination address.
2921 * Special case for SIT interfaces where we create a new "virtual"
2922 * device.
2923 */
addrconf_set_dstaddr(struct net * net,void __user * arg)2924 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2925 {
2926 struct net_device *dev;
2927 struct in6_ifreq ireq;
2928 int err = -ENODEV;
2929
2930 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2931 return -ENODEV;
2932 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2933 return -EFAULT;
2934
2935 rtnl_lock();
2936 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2937 if (dev && dev->type == ARPHRD_SIT)
2938 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2939 rtnl_unlock();
2940 return err;
2941 }
2942
ipv6_mc_config(struct sock * sk,bool join,const struct in6_addr * addr,int ifindex)2943 static int ipv6_mc_config(struct sock *sk, bool join,
2944 const struct in6_addr *addr, int ifindex)
2945 {
2946 int ret;
2947
2948 ASSERT_RTNL();
2949
2950 lock_sock(sk);
2951 if (join)
2952 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2953 else
2954 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2955 release_sock(sk);
2956
2957 return ret;
2958 }
2959
2960 /*
2961 * Manual configuration of address on an interface
2962 */
inet6_addr_add(struct net * net,int ifindex,struct ifa6_config * cfg,struct netlink_ext_ack * extack)2963 static int inet6_addr_add(struct net *net, int ifindex,
2964 struct ifa6_config *cfg,
2965 struct netlink_ext_ack *extack)
2966 {
2967 struct inet6_ifaddr *ifp;
2968 struct inet6_dev *idev;
2969 struct net_device *dev;
2970 unsigned long timeout;
2971 clock_t expires;
2972 u32 flags;
2973
2974 ASSERT_RTNL();
2975
2976 if (cfg->plen > 128) {
2977 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
2978 return -EINVAL;
2979 }
2980
2981 /* check the lifetime */
2982 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
2983 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
2984 return -EINVAL;
2985 }
2986
2987 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
2988 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
2989 return -EINVAL;
2990 }
2991
2992 dev = __dev_get_by_index(net, ifindex);
2993 if (!dev)
2994 return -ENODEV;
2995
2996 idev = addrconf_add_dev(dev);
2997 if (IS_ERR(idev)) {
2998 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
2999 return PTR_ERR(idev);
3000 }
3001
3002 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3003 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3004 true, cfg->pfx, ifindex);
3005
3006 if (ret < 0) {
3007 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3008 return ret;
3009 }
3010 }
3011
3012 cfg->scope = ipv6_addr_scope(cfg->pfx);
3013
3014 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3015 if (addrconf_finite_timeout(timeout)) {
3016 expires = jiffies_to_clock_t(timeout * HZ);
3017 cfg->valid_lft = timeout;
3018 flags = RTF_EXPIRES;
3019 } else {
3020 expires = 0;
3021 flags = 0;
3022 cfg->ifa_flags |= IFA_F_PERMANENT;
3023 }
3024
3025 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3026 if (addrconf_finite_timeout(timeout)) {
3027 if (timeout == 0)
3028 cfg->ifa_flags |= IFA_F_DEPRECATED;
3029 cfg->preferred_lft = timeout;
3030 }
3031
3032 ifp = ipv6_add_addr(idev, cfg, true, extack);
3033 if (!IS_ERR(ifp)) {
3034 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3035 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3036 ifp->rt_priority, dev, expires,
3037 flags, GFP_KERNEL);
3038 }
3039
3040 /* Send a netlink notification if DAD is enabled and
3041 * optimistic flag is not set
3042 */
3043 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3044 ipv6_ifa_notify(0, ifp);
3045 /*
3046 * Note that section 3.1 of RFC 4429 indicates
3047 * that the Optimistic flag should not be set for
3048 * manually configured addresses
3049 */
3050 addrconf_dad_start(ifp);
3051 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3052 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3053 cfg->preferred_lft, true, jiffies);
3054 in6_ifa_put(ifp);
3055 addrconf_verify_rtnl(net);
3056 return 0;
3057 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3058 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3059 cfg->pfx, ifindex);
3060 }
3061
3062 return PTR_ERR(ifp);
3063 }
3064
inet6_addr_del(struct net * net,int ifindex,u32 ifa_flags,const struct in6_addr * pfx,unsigned int plen,struct netlink_ext_ack * extack)3065 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3066 const struct in6_addr *pfx, unsigned int plen,
3067 struct netlink_ext_ack *extack)
3068 {
3069 struct inet6_ifaddr *ifp;
3070 struct inet6_dev *idev;
3071 struct net_device *dev;
3072
3073 if (plen > 128) {
3074 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3075 return -EINVAL;
3076 }
3077
3078 dev = __dev_get_by_index(net, ifindex);
3079 if (!dev) {
3080 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3081 return -ENODEV;
3082 }
3083
3084 idev = __in6_dev_get(dev);
3085 if (!idev) {
3086 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3087 return -ENXIO;
3088 }
3089
3090 read_lock_bh(&idev->lock);
3091 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3092 if (ifp->prefix_len == plen &&
3093 ipv6_addr_equal(pfx, &ifp->addr)) {
3094 in6_ifa_hold(ifp);
3095 read_unlock_bh(&idev->lock);
3096
3097 ipv6_del_addr(ifp);
3098
3099 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3100 (ifp->flags & IFA_F_MANAGETEMPADDR))
3101 delete_tempaddrs(idev, ifp);
3102
3103 addrconf_verify_rtnl(net);
3104 if (ipv6_addr_is_multicast(pfx)) {
3105 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3106 false, pfx, dev->ifindex);
3107 }
3108 return 0;
3109 }
3110 }
3111 read_unlock_bh(&idev->lock);
3112
3113 NL_SET_ERR_MSG_MOD(extack, "address not found");
3114 return -EADDRNOTAVAIL;
3115 }
3116
3117
addrconf_add_ifaddr(struct net * net,void __user * arg)3118 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3119 {
3120 struct ifa6_config cfg = {
3121 .ifa_flags = IFA_F_PERMANENT,
3122 .preferred_lft = INFINITY_LIFE_TIME,
3123 .valid_lft = INFINITY_LIFE_TIME,
3124 };
3125 struct in6_ifreq ireq;
3126 int err;
3127
3128 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3129 return -EPERM;
3130
3131 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3132 return -EFAULT;
3133
3134 cfg.pfx = &ireq.ifr6_addr;
3135 cfg.plen = ireq.ifr6_prefixlen;
3136
3137 rtnl_lock();
3138 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3139 rtnl_unlock();
3140 return err;
3141 }
3142
addrconf_del_ifaddr(struct net * net,void __user * arg)3143 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3144 {
3145 struct in6_ifreq ireq;
3146 int err;
3147
3148 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3149 return -EPERM;
3150
3151 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3152 return -EFAULT;
3153
3154 rtnl_lock();
3155 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3156 ireq.ifr6_prefixlen, NULL);
3157 rtnl_unlock();
3158 return err;
3159 }
3160
add_addr(struct inet6_dev * idev,const struct in6_addr * addr,int plen,int scope,u8 proto)3161 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3162 int plen, int scope, u8 proto)
3163 {
3164 struct inet6_ifaddr *ifp;
3165 struct ifa6_config cfg = {
3166 .pfx = addr,
3167 .plen = plen,
3168 .ifa_flags = IFA_F_PERMANENT,
3169 .valid_lft = INFINITY_LIFE_TIME,
3170 .preferred_lft = INFINITY_LIFE_TIME,
3171 .scope = scope,
3172 .ifa_proto = proto
3173 };
3174
3175 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3176 if (!IS_ERR(ifp)) {
3177 spin_lock_bh(&ifp->lock);
3178 ifp->flags &= ~IFA_F_TENTATIVE;
3179 spin_unlock_bh(&ifp->lock);
3180 rt_genid_bump_ipv6(dev_net(idev->dev));
3181 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3182 in6_ifa_put(ifp);
3183 }
3184 }
3185
3186 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
add_v4_addrs(struct inet6_dev * idev)3187 static void add_v4_addrs(struct inet6_dev *idev)
3188 {
3189 struct in6_addr addr;
3190 struct net_device *dev;
3191 struct net *net = dev_net(idev->dev);
3192 int scope, plen, offset = 0;
3193 u32 pflags = 0;
3194
3195 ASSERT_RTNL();
3196
3197 memset(&addr, 0, sizeof(struct in6_addr));
3198 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3199 if (idev->dev->addr_len == sizeof(struct in6_addr))
3200 offset = sizeof(struct in6_addr) - 4;
3201 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3202
3203 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3204 scope = IPV6_ADDR_COMPATv4;
3205 plen = 96;
3206 pflags |= RTF_NONEXTHOP;
3207 } else {
3208 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3209 return;
3210
3211 addr.s6_addr32[0] = htonl(0xfe800000);
3212 scope = IFA_LINK;
3213 plen = 64;
3214 }
3215
3216 if (addr.s6_addr32[3]) {
3217 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3218 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3219 GFP_KERNEL);
3220 return;
3221 }
3222
3223 for_each_netdev(net, dev) {
3224 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3225 if (in_dev && (dev->flags & IFF_UP)) {
3226 struct in_ifaddr *ifa;
3227 int flag = scope;
3228
3229 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3230 addr.s6_addr32[3] = ifa->ifa_local;
3231
3232 if (ifa->ifa_scope == RT_SCOPE_LINK)
3233 continue;
3234 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3235 if (idev->dev->flags&IFF_POINTOPOINT)
3236 continue;
3237 flag |= IFA_HOST;
3238 }
3239
3240 add_addr(idev, &addr, plen, flag,
3241 IFAPROT_UNSPEC);
3242 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3243 0, pflags, GFP_KERNEL);
3244 }
3245 }
3246 }
3247 }
3248 #endif
3249
init_loopback(struct net_device * dev)3250 static void init_loopback(struct net_device *dev)
3251 {
3252 struct inet6_dev *idev;
3253
3254 /* ::1 */
3255
3256 ASSERT_RTNL();
3257
3258 idev = ipv6_find_idev(dev);
3259 if (IS_ERR(idev)) {
3260 pr_debug("%s: add_dev failed\n", __func__);
3261 return;
3262 }
3263
3264 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3265 }
3266
addrconf_add_linklocal(struct inet6_dev * idev,const struct in6_addr * addr,u32 flags)3267 void addrconf_add_linklocal(struct inet6_dev *idev,
3268 const struct in6_addr *addr, u32 flags)
3269 {
3270 struct ifa6_config cfg = {
3271 .pfx = addr,
3272 .plen = 64,
3273 .ifa_flags = flags | IFA_F_PERMANENT,
3274 .valid_lft = INFINITY_LIFE_TIME,
3275 .preferred_lft = INFINITY_LIFE_TIME,
3276 .scope = IFA_LINK,
3277 .ifa_proto = IFAPROT_KERNEL_LL
3278 };
3279 struct inet6_ifaddr *ifp;
3280
3281 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3282 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3283 idev->cnf.optimistic_dad) &&
3284 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3285 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3286 #endif
3287
3288 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3289 if (!IS_ERR(ifp)) {
3290 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3291 0, 0, GFP_ATOMIC);
3292 addrconf_dad_start(ifp);
3293 in6_ifa_put(ifp);
3294 }
3295 }
3296 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3297
ipv6_reserved_interfaceid(struct in6_addr address)3298 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3299 {
3300 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3301 return true;
3302
3303 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3304 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3305 return true;
3306
3307 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3308 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3309 return true;
3310
3311 return false;
3312 }
3313
ipv6_generate_stable_address(struct in6_addr * address,u8 dad_count,const struct inet6_dev * idev)3314 static int ipv6_generate_stable_address(struct in6_addr *address,
3315 u8 dad_count,
3316 const struct inet6_dev *idev)
3317 {
3318 static DEFINE_SPINLOCK(lock);
3319 static __u32 digest[SHA1_DIGEST_WORDS];
3320 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3321
3322 static union {
3323 char __data[SHA1_BLOCK_SIZE];
3324 struct {
3325 struct in6_addr secret;
3326 __be32 prefix[2];
3327 unsigned char hwaddr[MAX_ADDR_LEN];
3328 u8 dad_count;
3329 } __packed;
3330 } data;
3331
3332 struct in6_addr secret;
3333 struct in6_addr temp;
3334 struct net *net = dev_net(idev->dev);
3335
3336 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3337
3338 if (idev->cnf.stable_secret.initialized)
3339 secret = idev->cnf.stable_secret.secret;
3340 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3341 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3342 else
3343 return -1;
3344
3345 retry:
3346 spin_lock_bh(&lock);
3347
3348 sha1_init(digest);
3349 memset(&data, 0, sizeof(data));
3350 memset(workspace, 0, sizeof(workspace));
3351 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3352 data.prefix[0] = address->s6_addr32[0];
3353 data.prefix[1] = address->s6_addr32[1];
3354 data.secret = secret;
3355 data.dad_count = dad_count;
3356
3357 sha1_transform(digest, data.__data, workspace);
3358
3359 temp = *address;
3360 temp.s6_addr32[2] = (__force __be32)digest[0];
3361 temp.s6_addr32[3] = (__force __be32)digest[1];
3362
3363 spin_unlock_bh(&lock);
3364
3365 if (ipv6_reserved_interfaceid(temp)) {
3366 dad_count++;
3367 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3368 return -1;
3369 goto retry;
3370 }
3371
3372 *address = temp;
3373 return 0;
3374 }
3375
ipv6_gen_mode_random_init(struct inet6_dev * idev)3376 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3377 {
3378 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3379
3380 if (s->initialized)
3381 return;
3382 s = &idev->cnf.stable_secret;
3383 get_random_bytes(&s->secret, sizeof(s->secret));
3384 s->initialized = true;
3385 }
3386
addrconf_addr_gen(struct inet6_dev * idev,bool prefix_route)3387 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3388 {
3389 struct in6_addr addr;
3390
3391 /* no link local addresses on L3 master devices */
3392 if (netif_is_l3_master(idev->dev))
3393 return;
3394
3395 /* no link local addresses on devices flagged as slaves */
3396 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3397 return;
3398
3399 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3400
3401 switch (idev->cnf.addr_gen_mode) {
3402 case IN6_ADDR_GEN_MODE_RANDOM:
3403 ipv6_gen_mode_random_init(idev);
3404 fallthrough;
3405 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3406 if (!ipv6_generate_stable_address(&addr, 0, idev))
3407 addrconf_add_linklocal(idev, &addr,
3408 IFA_F_STABLE_PRIVACY);
3409 else if (prefix_route)
3410 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3411 0, 0, GFP_KERNEL);
3412 break;
3413 case IN6_ADDR_GEN_MODE_EUI64:
3414 /* addrconf_add_linklocal also adds a prefix_route and we
3415 * only need to care about prefix routes if ipv6_generate_eui64
3416 * couldn't generate one.
3417 */
3418 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3419 addrconf_add_linklocal(idev, &addr, 0);
3420 else if (prefix_route)
3421 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3422 0, 0, GFP_KERNEL);
3423 break;
3424 case IN6_ADDR_GEN_MODE_NONE:
3425 default:
3426 /* will not add any link local address */
3427 break;
3428 }
3429 }
3430
addrconf_dev_config(struct net_device * dev)3431 static void addrconf_dev_config(struct net_device *dev)
3432 {
3433 struct inet6_dev *idev;
3434
3435 ASSERT_RTNL();
3436
3437 if ((dev->type != ARPHRD_ETHER) &&
3438 (dev->type != ARPHRD_FDDI) &&
3439 (dev->type != ARPHRD_ARCNET) &&
3440 (dev->type != ARPHRD_INFINIBAND) &&
3441 (dev->type != ARPHRD_IEEE1394) &&
3442 (dev->type != ARPHRD_TUNNEL6) &&
3443 (dev->type != ARPHRD_6LOWPAN) &&
3444 (dev->type != ARPHRD_TUNNEL) &&
3445 (dev->type != ARPHRD_NONE) &&
3446 (dev->type != ARPHRD_RAWIP)) {
3447 /* Alas, we support only Ethernet autoconfiguration. */
3448 idev = __in6_dev_get(dev);
3449 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3450 dev->flags & IFF_MULTICAST)
3451 ipv6_mc_up(idev);
3452 return;
3453 }
3454
3455 idev = addrconf_add_dev(dev);
3456 if (IS_ERR(idev))
3457 return;
3458
3459 /* this device type has no EUI support */
3460 if (dev->type == ARPHRD_NONE &&
3461 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3462 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3463
3464 addrconf_addr_gen(idev, false);
3465 }
3466
3467 #if IS_ENABLED(CONFIG_IPV6_SIT)
addrconf_sit_config(struct net_device * dev)3468 static void addrconf_sit_config(struct net_device *dev)
3469 {
3470 struct inet6_dev *idev;
3471
3472 ASSERT_RTNL();
3473
3474 /*
3475 * Configure the tunnel with one of our IPv4
3476 * addresses... we should configure all of
3477 * our v4 addrs in the tunnel
3478 */
3479
3480 idev = ipv6_find_idev(dev);
3481 if (IS_ERR(idev)) {
3482 pr_debug("%s: add_dev failed\n", __func__);
3483 return;
3484 }
3485
3486 if (dev->priv_flags & IFF_ISATAP) {
3487 addrconf_addr_gen(idev, false);
3488 return;
3489 }
3490
3491 add_v4_addrs(idev);
3492
3493 if (dev->flags&IFF_POINTOPOINT)
3494 addrconf_add_mroute(dev);
3495 }
3496 #endif
3497
3498 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
addrconf_gre_config(struct net_device * dev)3499 static void addrconf_gre_config(struct net_device *dev)
3500 {
3501 struct inet6_dev *idev;
3502
3503 ASSERT_RTNL();
3504
3505 idev = ipv6_find_idev(dev);
3506 if (IS_ERR(idev)) {
3507 pr_debug("%s: add_dev failed\n", __func__);
3508 return;
3509 }
3510
3511 if (dev->type == ARPHRD_ETHER) {
3512 addrconf_addr_gen(idev, true);
3513 return;
3514 }
3515
3516 add_v4_addrs(idev);
3517
3518 if (dev->flags & IFF_POINTOPOINT)
3519 addrconf_add_mroute(dev);
3520 }
3521 #endif
3522
addrconf_init_auto_addrs(struct net_device * dev)3523 static void addrconf_init_auto_addrs(struct net_device *dev)
3524 {
3525 switch (dev->type) {
3526 #if IS_ENABLED(CONFIG_IPV6_SIT)
3527 case ARPHRD_SIT:
3528 addrconf_sit_config(dev);
3529 break;
3530 #endif
3531 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3532 case ARPHRD_IP6GRE:
3533 case ARPHRD_IPGRE:
3534 addrconf_gre_config(dev);
3535 break;
3536 #endif
3537 case ARPHRD_LOOPBACK:
3538 init_loopback(dev);
3539 break;
3540
3541 default:
3542 addrconf_dev_config(dev);
3543 break;
3544 }
3545 }
3546
fixup_permanent_addr(struct net * net,struct inet6_dev * idev,struct inet6_ifaddr * ifp)3547 static int fixup_permanent_addr(struct net *net,
3548 struct inet6_dev *idev,
3549 struct inet6_ifaddr *ifp)
3550 {
3551 /* !fib6_node means the host route was removed from the
3552 * FIB, for example, if 'lo' device is taken down. In that
3553 * case regenerate the host route.
3554 */
3555 if (!ifp->rt || !ifp->rt->fib6_node) {
3556 struct fib6_info *f6i, *prev;
3557
3558 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3559 GFP_ATOMIC, NULL);
3560 if (IS_ERR(f6i))
3561 return PTR_ERR(f6i);
3562
3563 /* ifp->rt can be accessed outside of rtnl */
3564 spin_lock(&ifp->lock);
3565 prev = ifp->rt;
3566 ifp->rt = f6i;
3567 spin_unlock(&ifp->lock);
3568
3569 fib6_info_release(prev);
3570 }
3571
3572 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3573 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3574 ifp->rt_priority, idev->dev, 0, 0,
3575 GFP_ATOMIC);
3576 }
3577
3578 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3579 addrconf_dad_start(ifp);
3580
3581 return 0;
3582 }
3583
addrconf_permanent_addr(struct net * net,struct net_device * dev)3584 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3585 {
3586 struct inet6_ifaddr *ifp, *tmp;
3587 struct inet6_dev *idev;
3588
3589 idev = __in6_dev_get(dev);
3590 if (!idev)
3591 return;
3592
3593 write_lock_bh(&idev->lock);
3594
3595 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3596 if ((ifp->flags & IFA_F_PERMANENT) &&
3597 fixup_permanent_addr(net, idev, ifp) < 0) {
3598 write_unlock_bh(&idev->lock);
3599 in6_ifa_hold(ifp);
3600 ipv6_del_addr(ifp);
3601 write_lock_bh(&idev->lock);
3602
3603 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3604 idev->dev->name, &ifp->addr);
3605 }
3606 }
3607
3608 write_unlock_bh(&idev->lock);
3609 }
3610
addrconf_notify(struct notifier_block * this,unsigned long event,void * ptr)3611 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3612 void *ptr)
3613 {
3614 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3615 struct netdev_notifier_change_info *change_info;
3616 struct netdev_notifier_changeupper_info *info;
3617 struct inet6_dev *idev = __in6_dev_get(dev);
3618 struct net *net = dev_net(dev);
3619 int run_pending = 0;
3620 int err;
3621
3622 switch (event) {
3623 case NETDEV_REGISTER:
3624 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3625 idev = ipv6_add_dev(dev);
3626 if (IS_ERR(idev))
3627 return notifier_from_errno(PTR_ERR(idev));
3628 }
3629 break;
3630
3631 case NETDEV_CHANGEMTU:
3632 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3633 if (dev->mtu < IPV6_MIN_MTU) {
3634 addrconf_ifdown(dev, dev != net->loopback_dev);
3635 break;
3636 }
3637
3638 if (idev) {
3639 rt6_mtu_change(dev, dev->mtu);
3640 idev->cnf.mtu6 = dev->mtu;
3641 break;
3642 }
3643
3644 /* allocate new idev */
3645 idev = ipv6_add_dev(dev);
3646 if (IS_ERR(idev))
3647 break;
3648
3649 /* device is still not ready */
3650 if (!(idev->if_flags & IF_READY))
3651 break;
3652
3653 run_pending = 1;
3654 fallthrough;
3655 case NETDEV_UP:
3656 case NETDEV_CHANGE:
3657 if (idev && idev->cnf.disable_ipv6)
3658 break;
3659
3660 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3661 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3662 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3663 ipv6_mc_up(idev);
3664 break;
3665 }
3666
3667 if (event == NETDEV_UP) {
3668 /* restore routes for permanent addresses */
3669 addrconf_permanent_addr(net, dev);
3670
3671 if (!addrconf_link_ready(dev)) {
3672 /* device is not ready yet. */
3673 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3674 dev->name);
3675 break;
3676 }
3677
3678 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3679 idev = ipv6_add_dev(dev);
3680
3681 if (!IS_ERR_OR_NULL(idev)) {
3682 idev->if_flags |= IF_READY;
3683 run_pending = 1;
3684 }
3685 } else if (event == NETDEV_CHANGE) {
3686 if (!addrconf_link_ready(dev)) {
3687 /* device is still not ready. */
3688 rt6_sync_down_dev(dev, event);
3689 break;
3690 }
3691
3692 if (!IS_ERR_OR_NULL(idev)) {
3693 if (idev->if_flags & IF_READY) {
3694 /* device is already configured -
3695 * but resend MLD reports, we might
3696 * have roamed and need to update
3697 * multicast snooping switches
3698 */
3699 ipv6_mc_up(idev);
3700 change_info = ptr;
3701 if (change_info->flags_changed & IFF_NOARP)
3702 addrconf_dad_run(idev, true);
3703 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3704 break;
3705 }
3706 idev->if_flags |= IF_READY;
3707 }
3708
3709 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3710 dev->name);
3711
3712 run_pending = 1;
3713 }
3714
3715 addrconf_init_auto_addrs(dev);
3716
3717 if (!IS_ERR_OR_NULL(idev)) {
3718 if (run_pending)
3719 addrconf_dad_run(idev, false);
3720
3721 /* Device has an address by now */
3722 rt6_sync_up(dev, RTNH_F_DEAD);
3723
3724 /*
3725 * If the MTU changed during the interface down,
3726 * when the interface up, the changed MTU must be
3727 * reflected in the idev as well as routers.
3728 */
3729 if (idev->cnf.mtu6 != dev->mtu &&
3730 dev->mtu >= IPV6_MIN_MTU) {
3731 rt6_mtu_change(dev, dev->mtu);
3732 idev->cnf.mtu6 = dev->mtu;
3733 }
3734 idev->tstamp = jiffies;
3735 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3736
3737 /*
3738 * If the changed mtu during down is lower than
3739 * IPV6_MIN_MTU stop IPv6 on this interface.
3740 */
3741 if (dev->mtu < IPV6_MIN_MTU)
3742 addrconf_ifdown(dev, dev != net->loopback_dev);
3743 }
3744 break;
3745
3746 case NETDEV_DOWN:
3747 case NETDEV_UNREGISTER:
3748 /*
3749 * Remove all addresses from this interface.
3750 */
3751 addrconf_ifdown(dev, event != NETDEV_DOWN);
3752 break;
3753
3754 case NETDEV_CHANGENAME:
3755 if (idev) {
3756 snmp6_unregister_dev(idev);
3757 addrconf_sysctl_unregister(idev);
3758 err = addrconf_sysctl_register(idev);
3759 if (err)
3760 return notifier_from_errno(err);
3761 err = snmp6_register_dev(idev);
3762 if (err) {
3763 addrconf_sysctl_unregister(idev);
3764 return notifier_from_errno(err);
3765 }
3766 }
3767 break;
3768
3769 case NETDEV_PRE_TYPE_CHANGE:
3770 case NETDEV_POST_TYPE_CHANGE:
3771 if (idev)
3772 addrconf_type_change(dev, event);
3773 break;
3774
3775 case NETDEV_CHANGEUPPER:
3776 info = ptr;
3777
3778 /* flush all routes if dev is linked to or unlinked from
3779 * an L3 master device (e.g., VRF)
3780 */
3781 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3782 addrconf_ifdown(dev, false);
3783 }
3784
3785 return NOTIFY_OK;
3786 }
3787
3788 /*
3789 * addrconf module should be notified of a device going up
3790 */
3791 static struct notifier_block ipv6_dev_notf = {
3792 .notifier_call = addrconf_notify,
3793 .priority = ADDRCONF_NOTIFY_PRIORITY,
3794 };
3795
addrconf_type_change(struct net_device * dev,unsigned long event)3796 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3797 {
3798 struct inet6_dev *idev;
3799 ASSERT_RTNL();
3800
3801 idev = __in6_dev_get(dev);
3802
3803 if (event == NETDEV_POST_TYPE_CHANGE)
3804 ipv6_mc_remap(idev);
3805 else if (event == NETDEV_PRE_TYPE_CHANGE)
3806 ipv6_mc_unmap(idev);
3807 }
3808
addr_is_local(const struct in6_addr * addr)3809 static bool addr_is_local(const struct in6_addr *addr)
3810 {
3811 return ipv6_addr_type(addr) &
3812 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3813 }
3814
addrconf_ifdown(struct net_device * dev,bool unregister)3815 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3816 {
3817 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3818 struct net *net = dev_net(dev);
3819 struct inet6_dev *idev;
3820 struct inet6_ifaddr *ifa;
3821 LIST_HEAD(tmp_addr_list);
3822 bool keep_addr = false;
3823 bool was_ready;
3824 int state, i;
3825
3826 ASSERT_RTNL();
3827
3828 rt6_disable_ip(dev, event);
3829
3830 idev = __in6_dev_get(dev);
3831 if (!idev)
3832 return -ENODEV;
3833
3834 /*
3835 * Step 1: remove reference to ipv6 device from parent device.
3836 * Do not dev_put!
3837 */
3838 if (unregister) {
3839 idev->dead = 1;
3840
3841 /* protected by rtnl_lock */
3842 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3843
3844 /* Step 1.5: remove snmp6 entry */
3845 snmp6_unregister_dev(idev);
3846
3847 }
3848
3849 /* combine the user config with event to determine if permanent
3850 * addresses are to be removed from address hash table
3851 */
3852 if (!unregister && !idev->cnf.disable_ipv6) {
3853 /* aggregate the system setting and interface setting */
3854 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3855
3856 if (!_keep_addr)
3857 _keep_addr = idev->cnf.keep_addr_on_down;
3858
3859 keep_addr = (_keep_addr > 0);
3860 }
3861
3862 /* Step 2: clear hash table */
3863 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3864 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3865
3866 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3867 restart:
3868 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3869 if (ifa->idev == idev) {
3870 addrconf_del_dad_work(ifa);
3871 /* combined flag + permanent flag decide if
3872 * address is retained on a down event
3873 */
3874 if (!keep_addr ||
3875 !(ifa->flags & IFA_F_PERMANENT) ||
3876 addr_is_local(&ifa->addr)) {
3877 hlist_del_init_rcu(&ifa->addr_lst);
3878 goto restart;
3879 }
3880 }
3881 }
3882 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3883 }
3884
3885 write_lock_bh(&idev->lock);
3886
3887 addrconf_del_rs_timer(idev);
3888
3889 /* Step 2: clear flags for stateless addrconf, repeated down
3890 * detection
3891 */
3892 was_ready = idev->if_flags & IF_READY;
3893 if (!unregister)
3894 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3895
3896 /* Step 3: clear tempaddr list */
3897 while (!list_empty(&idev->tempaddr_list)) {
3898 ifa = list_first_entry(&idev->tempaddr_list,
3899 struct inet6_ifaddr, tmp_list);
3900 list_del(&ifa->tmp_list);
3901 write_unlock_bh(&idev->lock);
3902 spin_lock_bh(&ifa->lock);
3903
3904 if (ifa->ifpub) {
3905 in6_ifa_put(ifa->ifpub);
3906 ifa->ifpub = NULL;
3907 }
3908 spin_unlock_bh(&ifa->lock);
3909 in6_ifa_put(ifa);
3910 write_lock_bh(&idev->lock);
3911 }
3912
3913 list_for_each_entry(ifa, &idev->addr_list, if_list)
3914 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3915 write_unlock_bh(&idev->lock);
3916
3917 while (!list_empty(&tmp_addr_list)) {
3918 struct fib6_info *rt = NULL;
3919 bool keep;
3920
3921 ifa = list_first_entry(&tmp_addr_list,
3922 struct inet6_ifaddr, if_list_aux);
3923 list_del(&ifa->if_list_aux);
3924
3925 addrconf_del_dad_work(ifa);
3926
3927 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3928 !addr_is_local(&ifa->addr);
3929
3930 spin_lock_bh(&ifa->lock);
3931
3932 if (keep) {
3933 /* set state to skip the notifier below */
3934 state = INET6_IFADDR_STATE_DEAD;
3935 ifa->state = INET6_IFADDR_STATE_PREDAD;
3936 if (!(ifa->flags & IFA_F_NODAD))
3937 ifa->flags |= IFA_F_TENTATIVE;
3938
3939 rt = ifa->rt;
3940 ifa->rt = NULL;
3941 } else {
3942 state = ifa->state;
3943 ifa->state = INET6_IFADDR_STATE_DEAD;
3944 }
3945
3946 spin_unlock_bh(&ifa->lock);
3947
3948 if (rt)
3949 ip6_del_rt(net, rt, false);
3950
3951 if (state != INET6_IFADDR_STATE_DEAD) {
3952 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3953 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3954 } else {
3955 if (idev->cnf.forwarding)
3956 addrconf_leave_anycast(ifa);
3957 addrconf_leave_solict(ifa->idev, &ifa->addr);
3958 }
3959
3960 if (!keep) {
3961 write_lock_bh(&idev->lock);
3962 list_del_rcu(&ifa->if_list);
3963 write_unlock_bh(&idev->lock);
3964 in6_ifa_put(ifa);
3965 }
3966 }
3967
3968 /* Step 5: Discard anycast and multicast list */
3969 if (unregister) {
3970 ipv6_ac_destroy_dev(idev);
3971 ipv6_mc_destroy_dev(idev);
3972 } else if (was_ready) {
3973 ipv6_mc_down(idev);
3974 }
3975
3976 idev->tstamp = jiffies;
3977 idev->ra_mtu = 0;
3978
3979 /* Last: Shot the device (if unregistered) */
3980 if (unregister) {
3981 addrconf_sysctl_unregister(idev);
3982 neigh_parms_release(&nd_tbl, idev->nd_parms);
3983 neigh_ifdown(&nd_tbl, dev);
3984 in6_dev_put(idev);
3985 }
3986 return 0;
3987 }
3988
addrconf_rs_timer(struct timer_list * t)3989 static void addrconf_rs_timer(struct timer_list *t)
3990 {
3991 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3992 struct net_device *dev = idev->dev;
3993 struct in6_addr lladdr;
3994
3995 write_lock(&idev->lock);
3996 if (idev->dead || !(idev->if_flags & IF_READY))
3997 goto out;
3998
3999 if (!ipv6_accept_ra(idev))
4000 goto out;
4001
4002 /* Announcement received after solicitation was sent */
4003 if (idev->if_flags & IF_RA_RCVD)
4004 goto out;
4005
4006 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
4007 write_unlock(&idev->lock);
4008 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4009 ndisc_send_rs(dev, &lladdr,
4010 &in6addr_linklocal_allrouters);
4011 else
4012 goto put;
4013
4014 write_lock(&idev->lock);
4015 idev->rs_interval = rfc3315_s14_backoff_update(
4016 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
4017 /* The wait after the last probe can be shorter */
4018 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4019 idev->cnf.rtr_solicits) ?
4020 idev->cnf.rtr_solicit_delay :
4021 idev->rs_interval);
4022 } else {
4023 /*
4024 * Note: we do not support deprecated "all on-link"
4025 * assumption any longer.
4026 */
4027 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4028 }
4029
4030 out:
4031 write_unlock(&idev->lock);
4032 put:
4033 in6_dev_put(idev);
4034 }
4035
4036 /*
4037 * Duplicate Address Detection
4038 */
addrconf_dad_kick(struct inet6_ifaddr * ifp)4039 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4040 {
4041 unsigned long rand_num;
4042 struct inet6_dev *idev = ifp->idev;
4043 u64 nonce;
4044
4045 if (ifp->flags & IFA_F_OPTIMISTIC)
4046 rand_num = 0;
4047 else
4048 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1);
4049
4050 nonce = 0;
4051 if (idev->cnf.enhanced_dad ||
4052 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
4053 do
4054 get_random_bytes(&nonce, 6);
4055 while (nonce == 0);
4056 }
4057 ifp->dad_nonce = nonce;
4058 ifp->dad_probes = idev->cnf.dad_transmits;
4059 addrconf_mod_dad_work(ifp, rand_num);
4060 }
4061
addrconf_dad_begin(struct inet6_ifaddr * ifp)4062 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4063 {
4064 struct inet6_dev *idev = ifp->idev;
4065 struct net_device *dev = idev->dev;
4066 bool bump_id, notify = false;
4067 struct net *net;
4068
4069 addrconf_join_solict(dev, &ifp->addr);
4070
4071 read_lock_bh(&idev->lock);
4072 spin_lock(&ifp->lock);
4073 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4074 goto out;
4075
4076 net = dev_net(dev);
4077 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4078 (net->ipv6.devconf_all->accept_dad < 1 &&
4079 idev->cnf.accept_dad < 1) ||
4080 !(ifp->flags&IFA_F_TENTATIVE) ||
4081 ifp->flags & IFA_F_NODAD) {
4082 bool send_na = false;
4083
4084 if (ifp->flags & IFA_F_TENTATIVE &&
4085 !(ifp->flags & IFA_F_OPTIMISTIC))
4086 send_na = true;
4087 bump_id = ifp->flags & IFA_F_TENTATIVE;
4088 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4089 spin_unlock(&ifp->lock);
4090 read_unlock_bh(&idev->lock);
4091
4092 addrconf_dad_completed(ifp, bump_id, send_na);
4093 return;
4094 }
4095
4096 if (!(idev->if_flags & IF_READY)) {
4097 spin_unlock(&ifp->lock);
4098 read_unlock_bh(&idev->lock);
4099 /*
4100 * If the device is not ready:
4101 * - keep it tentative if it is a permanent address.
4102 * - otherwise, kill it.
4103 */
4104 in6_ifa_hold(ifp);
4105 addrconf_dad_stop(ifp, 0);
4106 return;
4107 }
4108
4109 /*
4110 * Optimistic nodes can start receiving
4111 * Frames right away
4112 */
4113 if (ifp->flags & IFA_F_OPTIMISTIC) {
4114 ip6_ins_rt(net, ifp->rt);
4115 if (ipv6_use_optimistic_addr(net, idev)) {
4116 /* Because optimistic nodes can use this address,
4117 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4118 */
4119 notify = true;
4120 }
4121 }
4122
4123 addrconf_dad_kick(ifp);
4124 out:
4125 spin_unlock(&ifp->lock);
4126 read_unlock_bh(&idev->lock);
4127 if (notify)
4128 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4129 }
4130
addrconf_dad_start(struct inet6_ifaddr * ifp)4131 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4132 {
4133 bool begin_dad = false;
4134
4135 spin_lock_bh(&ifp->lock);
4136 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4137 ifp->state = INET6_IFADDR_STATE_PREDAD;
4138 begin_dad = true;
4139 }
4140 spin_unlock_bh(&ifp->lock);
4141
4142 if (begin_dad)
4143 addrconf_mod_dad_work(ifp, 0);
4144 }
4145
addrconf_dad_work(struct work_struct * w)4146 static void addrconf_dad_work(struct work_struct *w)
4147 {
4148 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4149 struct inet6_ifaddr,
4150 dad_work);
4151 struct inet6_dev *idev = ifp->idev;
4152 bool bump_id, disable_ipv6 = false;
4153 struct in6_addr mcaddr;
4154
4155 enum {
4156 DAD_PROCESS,
4157 DAD_BEGIN,
4158 DAD_ABORT,
4159 } action = DAD_PROCESS;
4160
4161 rtnl_lock();
4162
4163 spin_lock_bh(&ifp->lock);
4164 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4165 action = DAD_BEGIN;
4166 ifp->state = INET6_IFADDR_STATE_DAD;
4167 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4168 action = DAD_ABORT;
4169 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4170
4171 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4172 idev->cnf.accept_dad > 1) &&
4173 !idev->cnf.disable_ipv6 &&
4174 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4175 struct in6_addr addr;
4176
4177 addr.s6_addr32[0] = htonl(0xfe800000);
4178 addr.s6_addr32[1] = 0;
4179
4180 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4181 ipv6_addr_equal(&ifp->addr, &addr)) {
4182 /* DAD failed for link-local based on MAC */
4183 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4184
4185 pr_info("%s: IPv6 being disabled!\n",
4186 ifp->idev->dev->name);
4187 disable_ipv6 = true;
4188 }
4189 }
4190 }
4191 spin_unlock_bh(&ifp->lock);
4192
4193 if (action == DAD_BEGIN) {
4194 addrconf_dad_begin(ifp);
4195 goto out;
4196 } else if (action == DAD_ABORT) {
4197 in6_ifa_hold(ifp);
4198 addrconf_dad_stop(ifp, 1);
4199 if (disable_ipv6)
4200 addrconf_ifdown(idev->dev, false);
4201 goto out;
4202 }
4203
4204 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4205 goto out;
4206
4207 write_lock_bh(&idev->lock);
4208 if (idev->dead || !(idev->if_flags & IF_READY)) {
4209 write_unlock_bh(&idev->lock);
4210 goto out;
4211 }
4212
4213 spin_lock(&ifp->lock);
4214 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4215 spin_unlock(&ifp->lock);
4216 write_unlock_bh(&idev->lock);
4217 goto out;
4218 }
4219
4220 if (ifp->dad_probes == 0) {
4221 bool send_na = false;
4222
4223 /*
4224 * DAD was successful
4225 */
4226
4227 if (ifp->flags & IFA_F_TENTATIVE &&
4228 !(ifp->flags & IFA_F_OPTIMISTIC))
4229 send_na = true;
4230 bump_id = ifp->flags & IFA_F_TENTATIVE;
4231 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4232 spin_unlock(&ifp->lock);
4233 write_unlock_bh(&idev->lock);
4234
4235 addrconf_dad_completed(ifp, bump_id, send_na);
4236
4237 goto out;
4238 }
4239
4240 ifp->dad_probes--;
4241 addrconf_mod_dad_work(ifp,
4242 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4243 HZ/100));
4244 spin_unlock(&ifp->lock);
4245 write_unlock_bh(&idev->lock);
4246
4247 /* send a neighbour solicitation for our addr */
4248 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4249 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4250 ifp->dad_nonce);
4251 out:
4252 in6_ifa_put(ifp);
4253 rtnl_unlock();
4254 }
4255
4256 /* ifp->idev must be at least read locked */
ipv6_lonely_lladdr(struct inet6_ifaddr * ifp)4257 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4258 {
4259 struct inet6_ifaddr *ifpiter;
4260 struct inet6_dev *idev = ifp->idev;
4261
4262 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4263 if (ifpiter->scope > IFA_LINK)
4264 break;
4265 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4266 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4267 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4268 IFA_F_PERMANENT)
4269 return false;
4270 }
4271 return true;
4272 }
4273
addrconf_dad_completed(struct inet6_ifaddr * ifp,bool bump_id,bool send_na)4274 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4275 bool send_na)
4276 {
4277 struct net_device *dev = ifp->idev->dev;
4278 struct in6_addr lladdr;
4279 bool send_rs, send_mld;
4280
4281 addrconf_del_dad_work(ifp);
4282
4283 /*
4284 * Configure the address for reception. Now it is valid.
4285 */
4286
4287 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4288
4289 /* If added prefix is link local and we are prepared to process
4290 router advertisements, start sending router solicitations.
4291 */
4292
4293 read_lock_bh(&ifp->idev->lock);
4294 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4295 send_rs = send_mld &&
4296 ipv6_accept_ra(ifp->idev) &&
4297 ifp->idev->cnf.rtr_solicits != 0 &&
4298 (dev->flags & IFF_LOOPBACK) == 0 &&
4299 (dev->type != ARPHRD_TUNNEL) &&
4300 !netif_is_team_port(dev);
4301 read_unlock_bh(&ifp->idev->lock);
4302
4303 /* While dad is in progress mld report's source address is in6_addrany.
4304 * Resend with proper ll now.
4305 */
4306 if (send_mld)
4307 ipv6_mc_dad_complete(ifp->idev);
4308
4309 /* send unsolicited NA if enabled */
4310 if (send_na &&
4311 (ifp->idev->cnf.ndisc_notify ||
4312 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4313 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4314 /*router=*/ !!ifp->idev->cnf.forwarding,
4315 /*solicited=*/ false, /*override=*/ true,
4316 /*inc_opt=*/ true);
4317 }
4318
4319 if (send_rs) {
4320 /*
4321 * If a host as already performed a random delay
4322 * [...] as part of DAD [...] there is no need
4323 * to delay again before sending the first RS
4324 */
4325 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4326 return;
4327 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4328
4329 write_lock_bh(&ifp->idev->lock);
4330 spin_lock(&ifp->lock);
4331 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4332 ifp->idev->cnf.rtr_solicit_interval);
4333 ifp->idev->rs_probes = 1;
4334 ifp->idev->if_flags |= IF_RS_SENT;
4335 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4336 spin_unlock(&ifp->lock);
4337 write_unlock_bh(&ifp->idev->lock);
4338 }
4339
4340 if (bump_id)
4341 rt_genid_bump_ipv6(dev_net(dev));
4342
4343 /* Make sure that a new temporary address will be created
4344 * before this temporary address becomes deprecated.
4345 */
4346 if (ifp->flags & IFA_F_TEMPORARY)
4347 addrconf_verify_rtnl(dev_net(dev));
4348 }
4349
addrconf_dad_run(struct inet6_dev * idev,bool restart)4350 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4351 {
4352 struct inet6_ifaddr *ifp;
4353
4354 read_lock_bh(&idev->lock);
4355 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4356 spin_lock(&ifp->lock);
4357 if ((ifp->flags & IFA_F_TENTATIVE &&
4358 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4359 if (restart)
4360 ifp->state = INET6_IFADDR_STATE_PREDAD;
4361 addrconf_dad_kick(ifp);
4362 }
4363 spin_unlock(&ifp->lock);
4364 }
4365 read_unlock_bh(&idev->lock);
4366 }
4367
4368 #ifdef CONFIG_PROC_FS
4369 struct if6_iter_state {
4370 struct seq_net_private p;
4371 int bucket;
4372 int offset;
4373 };
4374
if6_get_first(struct seq_file * seq,loff_t pos)4375 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4376 {
4377 struct if6_iter_state *state = seq->private;
4378 struct net *net = seq_file_net(seq);
4379 struct inet6_ifaddr *ifa = NULL;
4380 int p = 0;
4381
4382 /* initial bucket if pos is 0 */
4383 if (pos == 0) {
4384 state->bucket = 0;
4385 state->offset = 0;
4386 }
4387
4388 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4389 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4390 addr_lst) {
4391 /* sync with offset */
4392 if (p < state->offset) {
4393 p++;
4394 continue;
4395 }
4396 return ifa;
4397 }
4398
4399 /* prepare for next bucket */
4400 state->offset = 0;
4401 p = 0;
4402 }
4403 return NULL;
4404 }
4405
if6_get_next(struct seq_file * seq,struct inet6_ifaddr * ifa)4406 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4407 struct inet6_ifaddr *ifa)
4408 {
4409 struct if6_iter_state *state = seq->private;
4410 struct net *net = seq_file_net(seq);
4411
4412 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4413 state->offset++;
4414 return ifa;
4415 }
4416
4417 state->offset = 0;
4418 while (++state->bucket < IN6_ADDR_HSIZE) {
4419 hlist_for_each_entry_rcu(ifa,
4420 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4421 return ifa;
4422 }
4423 }
4424
4425 return NULL;
4426 }
4427
if6_seq_start(struct seq_file * seq,loff_t * pos)4428 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4429 __acquires(rcu)
4430 {
4431 rcu_read_lock();
4432 return if6_get_first(seq, *pos);
4433 }
4434
if6_seq_next(struct seq_file * seq,void * v,loff_t * pos)4435 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4436 {
4437 struct inet6_ifaddr *ifa;
4438
4439 ifa = if6_get_next(seq, v);
4440 ++*pos;
4441 return ifa;
4442 }
4443
if6_seq_stop(struct seq_file * seq,void * v)4444 static void if6_seq_stop(struct seq_file *seq, void *v)
4445 __releases(rcu)
4446 {
4447 rcu_read_unlock();
4448 }
4449
if6_seq_show(struct seq_file * seq,void * v)4450 static int if6_seq_show(struct seq_file *seq, void *v)
4451 {
4452 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4453 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4454 &ifp->addr,
4455 ifp->idev->dev->ifindex,
4456 ifp->prefix_len,
4457 ifp->scope,
4458 (u8) ifp->flags,
4459 ifp->idev->dev->name);
4460 return 0;
4461 }
4462
4463 static const struct seq_operations if6_seq_ops = {
4464 .start = if6_seq_start,
4465 .next = if6_seq_next,
4466 .show = if6_seq_show,
4467 .stop = if6_seq_stop,
4468 };
4469
if6_proc_net_init(struct net * net)4470 static int __net_init if6_proc_net_init(struct net *net)
4471 {
4472 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4473 sizeof(struct if6_iter_state)))
4474 return -ENOMEM;
4475 return 0;
4476 }
4477
if6_proc_net_exit(struct net * net)4478 static void __net_exit if6_proc_net_exit(struct net *net)
4479 {
4480 remove_proc_entry("if_inet6", net->proc_net);
4481 }
4482
4483 static struct pernet_operations if6_proc_net_ops = {
4484 .init = if6_proc_net_init,
4485 .exit = if6_proc_net_exit,
4486 };
4487
if6_proc_init(void)4488 int __init if6_proc_init(void)
4489 {
4490 return register_pernet_subsys(&if6_proc_net_ops);
4491 }
4492
if6_proc_exit(void)4493 void if6_proc_exit(void)
4494 {
4495 unregister_pernet_subsys(&if6_proc_net_ops);
4496 }
4497 #endif /* CONFIG_PROC_FS */
4498
4499 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4500 /* Check if address is a home address configured on any interface. */
ipv6_chk_home_addr(struct net * net,const struct in6_addr * addr)4501 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4502 {
4503 unsigned int hash = inet6_addr_hash(net, addr);
4504 struct inet6_ifaddr *ifp = NULL;
4505 int ret = 0;
4506
4507 rcu_read_lock();
4508 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4509 if (ipv6_addr_equal(&ifp->addr, addr) &&
4510 (ifp->flags & IFA_F_HOMEADDRESS)) {
4511 ret = 1;
4512 break;
4513 }
4514 }
4515 rcu_read_unlock();
4516 return ret;
4517 }
4518 #endif
4519
4520 /* RFC6554 has some algorithm to avoid loops in segment routing by
4521 * checking if the segments contains any of a local interface address.
4522 *
4523 * Quote:
4524 *
4525 * To detect loops in the SRH, a router MUST determine if the SRH
4526 * includes multiple addresses assigned to any interface on that router.
4527 * If such addresses appear more than once and are separated by at least
4528 * one address not assigned to that router.
4529 */
ipv6_chk_rpl_srh_loop(struct net * net,const struct in6_addr * segs,unsigned char nsegs)4530 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4531 unsigned char nsegs)
4532 {
4533 const struct in6_addr *addr;
4534 int i, ret = 0, found = 0;
4535 struct inet6_ifaddr *ifp;
4536 bool separated = false;
4537 unsigned int hash;
4538 bool hash_found;
4539
4540 rcu_read_lock();
4541 for (i = 0; i < nsegs; i++) {
4542 addr = &segs[i];
4543 hash = inet6_addr_hash(net, addr);
4544
4545 hash_found = false;
4546 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4547
4548 if (ipv6_addr_equal(&ifp->addr, addr)) {
4549 hash_found = true;
4550 break;
4551 }
4552 }
4553
4554 if (hash_found) {
4555 if (found > 1 && separated) {
4556 ret = 1;
4557 break;
4558 }
4559
4560 separated = false;
4561 found++;
4562 } else {
4563 separated = true;
4564 }
4565 }
4566 rcu_read_unlock();
4567
4568 return ret;
4569 }
4570
4571 /*
4572 * Periodic address status verification
4573 */
4574
addrconf_verify_rtnl(struct net * net)4575 static void addrconf_verify_rtnl(struct net *net)
4576 {
4577 unsigned long now, next, next_sec, next_sched;
4578 struct inet6_ifaddr *ifp;
4579 int i;
4580
4581 ASSERT_RTNL();
4582
4583 rcu_read_lock_bh();
4584 now = jiffies;
4585 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4586
4587 cancel_delayed_work(&net->ipv6.addr_chk_work);
4588
4589 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4590 restart:
4591 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4592 unsigned long age;
4593
4594 /* When setting preferred_lft to a value not zero or
4595 * infinity, while valid_lft is infinity
4596 * IFA_F_PERMANENT has a non-infinity life time.
4597 */
4598 if ((ifp->flags & IFA_F_PERMANENT) &&
4599 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4600 continue;
4601
4602 spin_lock(&ifp->lock);
4603 /* We try to batch several events at once. */
4604 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4605
4606 if ((ifp->flags&IFA_F_TEMPORARY) &&
4607 !(ifp->flags&IFA_F_TENTATIVE) &&
4608 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4609 !ifp->regen_count && ifp->ifpub) {
4610 /* This is a non-regenerated temporary addr. */
4611
4612 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4613 ifp->idev->cnf.dad_transmits *
4614 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4615
4616 if (age + regen_advance >= ifp->prefered_lft) {
4617 struct inet6_ifaddr *ifpub = ifp->ifpub;
4618 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4619 next = ifp->tstamp + ifp->prefered_lft * HZ;
4620
4621 ifp->regen_count++;
4622 in6_ifa_hold(ifp);
4623 in6_ifa_hold(ifpub);
4624 spin_unlock(&ifp->lock);
4625
4626 spin_lock(&ifpub->lock);
4627 ifpub->regen_count = 0;
4628 spin_unlock(&ifpub->lock);
4629 rcu_read_unlock_bh();
4630 ipv6_create_tempaddr(ifpub, true);
4631 in6_ifa_put(ifpub);
4632 in6_ifa_put(ifp);
4633 rcu_read_lock_bh();
4634 goto restart;
4635 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4636 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4637 }
4638
4639 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4640 age >= ifp->valid_lft) {
4641 spin_unlock(&ifp->lock);
4642 in6_ifa_hold(ifp);
4643 rcu_read_unlock_bh();
4644 ipv6_del_addr(ifp);
4645 rcu_read_lock_bh();
4646 goto restart;
4647 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4648 spin_unlock(&ifp->lock);
4649 continue;
4650 } else if (age >= ifp->prefered_lft) {
4651 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4652 int deprecate = 0;
4653
4654 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4655 deprecate = 1;
4656 ifp->flags |= IFA_F_DEPRECATED;
4657 }
4658
4659 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4660 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4661 next = ifp->tstamp + ifp->valid_lft * HZ;
4662
4663 spin_unlock(&ifp->lock);
4664
4665 if (deprecate) {
4666 in6_ifa_hold(ifp);
4667
4668 ipv6_ifa_notify(0, ifp);
4669 in6_ifa_put(ifp);
4670 goto restart;
4671 }
4672 } else {
4673 /* ifp->prefered_lft <= ifp->valid_lft */
4674 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4675 next = ifp->tstamp + ifp->prefered_lft * HZ;
4676 spin_unlock(&ifp->lock);
4677 }
4678 }
4679 }
4680
4681 next_sec = round_jiffies_up(next);
4682 next_sched = next;
4683
4684 /* If rounded timeout is accurate enough, accept it. */
4685 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4686 next_sched = next_sec;
4687
4688 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4689 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4690 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4691
4692 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4693 now, next, next_sec, next_sched);
4694 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4695 rcu_read_unlock_bh();
4696 }
4697
addrconf_verify_work(struct work_struct * w)4698 static void addrconf_verify_work(struct work_struct *w)
4699 {
4700 struct net *net = container_of(to_delayed_work(w), struct net,
4701 ipv6.addr_chk_work);
4702
4703 rtnl_lock();
4704 addrconf_verify_rtnl(net);
4705 rtnl_unlock();
4706 }
4707
addrconf_verify(struct net * net)4708 static void addrconf_verify(struct net *net)
4709 {
4710 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4711 }
4712
extract_addr(struct nlattr * addr,struct nlattr * local,struct in6_addr ** peer_pfx)4713 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4714 struct in6_addr **peer_pfx)
4715 {
4716 struct in6_addr *pfx = NULL;
4717
4718 *peer_pfx = NULL;
4719
4720 if (addr)
4721 pfx = nla_data(addr);
4722
4723 if (local) {
4724 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4725 *peer_pfx = pfx;
4726 pfx = nla_data(local);
4727 }
4728
4729 return pfx;
4730 }
4731
4732 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4733 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4734 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4735 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4736 [IFA_FLAGS] = { .len = sizeof(u32) },
4737 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4738 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4739 [IFA_PROTO] = { .type = NLA_U8 },
4740 };
4741
4742 static int
inet6_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4743 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4744 struct netlink_ext_ack *extack)
4745 {
4746 struct net *net = sock_net(skb->sk);
4747 struct ifaddrmsg *ifm;
4748 struct nlattr *tb[IFA_MAX+1];
4749 struct in6_addr *pfx, *peer_pfx;
4750 u32 ifa_flags;
4751 int err;
4752
4753 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4754 ifa_ipv6_policy, extack);
4755 if (err < 0)
4756 return err;
4757
4758 ifm = nlmsg_data(nlh);
4759 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4760 if (!pfx)
4761 return -EINVAL;
4762
4763 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4764
4765 /* We ignore other flags so far. */
4766 ifa_flags &= IFA_F_MANAGETEMPADDR;
4767
4768 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4769 ifm->ifa_prefixlen, extack);
4770 }
4771
modify_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,u32 flags,bool modify_peer)4772 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4773 unsigned long expires, u32 flags,
4774 bool modify_peer)
4775 {
4776 struct fib6_info *f6i;
4777 u32 prio;
4778
4779 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4780 ifp->prefix_len,
4781 ifp->idev->dev, 0, RTF_DEFAULT, true);
4782 if (!f6i)
4783 return -ENOENT;
4784
4785 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4786 if (f6i->fib6_metric != prio) {
4787 /* delete old one */
4788 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4789
4790 /* add new one */
4791 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4792 ifp->prefix_len,
4793 ifp->rt_priority, ifp->idev->dev,
4794 expires, flags, GFP_KERNEL);
4795 } else {
4796 if (!expires)
4797 fib6_clean_expires(f6i);
4798 else
4799 fib6_set_expires(f6i, expires);
4800
4801 fib6_info_release(f6i);
4802 }
4803
4804 return 0;
4805 }
4806
inet6_addr_modify(struct net * net,struct inet6_ifaddr * ifp,struct ifa6_config * cfg)4807 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4808 struct ifa6_config *cfg)
4809 {
4810 u32 flags;
4811 clock_t expires;
4812 unsigned long timeout;
4813 bool was_managetempaddr;
4814 bool had_prefixroute;
4815 bool new_peer = false;
4816
4817 ASSERT_RTNL();
4818
4819 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4820 return -EINVAL;
4821
4822 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4823 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4824 return -EINVAL;
4825
4826 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4827 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4828
4829 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4830 if (addrconf_finite_timeout(timeout)) {
4831 expires = jiffies_to_clock_t(timeout * HZ);
4832 cfg->valid_lft = timeout;
4833 flags = RTF_EXPIRES;
4834 } else {
4835 expires = 0;
4836 flags = 0;
4837 cfg->ifa_flags |= IFA_F_PERMANENT;
4838 }
4839
4840 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4841 if (addrconf_finite_timeout(timeout)) {
4842 if (timeout == 0)
4843 cfg->ifa_flags |= IFA_F_DEPRECATED;
4844 cfg->preferred_lft = timeout;
4845 }
4846
4847 if (cfg->peer_pfx &&
4848 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4849 if (!ipv6_addr_any(&ifp->peer_addr))
4850 cleanup_prefix_route(ifp, expires, true, true);
4851 new_peer = true;
4852 }
4853
4854 spin_lock_bh(&ifp->lock);
4855 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4856 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4857 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4858 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4859 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4860 IFA_F_NOPREFIXROUTE);
4861 ifp->flags |= cfg->ifa_flags;
4862 ifp->tstamp = jiffies;
4863 ifp->valid_lft = cfg->valid_lft;
4864 ifp->prefered_lft = cfg->preferred_lft;
4865 ifp->ifa_proto = cfg->ifa_proto;
4866
4867 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4868 ifp->rt_priority = cfg->rt_priority;
4869
4870 if (new_peer)
4871 ifp->peer_addr = *cfg->peer_pfx;
4872
4873 spin_unlock_bh(&ifp->lock);
4874 if (!(ifp->flags&IFA_F_TENTATIVE))
4875 ipv6_ifa_notify(0, ifp);
4876
4877 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4878 int rc = -ENOENT;
4879
4880 if (had_prefixroute)
4881 rc = modify_prefix_route(ifp, expires, flags, false);
4882
4883 /* prefix route could have been deleted; if so restore it */
4884 if (rc == -ENOENT) {
4885 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4886 ifp->rt_priority, ifp->idev->dev,
4887 expires, flags, GFP_KERNEL);
4888 }
4889
4890 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4891 rc = modify_prefix_route(ifp, expires, flags, true);
4892
4893 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4894 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4895 ifp->rt_priority, ifp->idev->dev,
4896 expires, flags, GFP_KERNEL);
4897 }
4898 } else if (had_prefixroute) {
4899 enum cleanup_prefix_rt_t action;
4900 unsigned long rt_expires;
4901
4902 write_lock_bh(&ifp->idev->lock);
4903 action = check_cleanup_prefix_route(ifp, &rt_expires);
4904 write_unlock_bh(&ifp->idev->lock);
4905
4906 if (action != CLEANUP_PREFIX_RT_NOP) {
4907 cleanup_prefix_route(ifp, rt_expires,
4908 action == CLEANUP_PREFIX_RT_DEL, false);
4909 }
4910 }
4911
4912 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4913 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4914 delete_tempaddrs(ifp->idev, ifp);
4915 else
4916 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4917 cfg->preferred_lft, !was_managetempaddr,
4918 jiffies);
4919 }
4920
4921 addrconf_verify_rtnl(net);
4922
4923 return 0;
4924 }
4925
4926 static int
inet6_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4927 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4928 struct netlink_ext_ack *extack)
4929 {
4930 struct net *net = sock_net(skb->sk);
4931 struct ifaddrmsg *ifm;
4932 struct nlattr *tb[IFA_MAX+1];
4933 struct in6_addr *peer_pfx;
4934 struct inet6_ifaddr *ifa;
4935 struct net_device *dev;
4936 struct inet6_dev *idev;
4937 struct ifa6_config cfg;
4938 int err;
4939
4940 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4941 ifa_ipv6_policy, extack);
4942 if (err < 0)
4943 return err;
4944
4945 memset(&cfg, 0, sizeof(cfg));
4946
4947 ifm = nlmsg_data(nlh);
4948 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4949 if (!cfg.pfx)
4950 return -EINVAL;
4951
4952 cfg.peer_pfx = peer_pfx;
4953 cfg.plen = ifm->ifa_prefixlen;
4954 if (tb[IFA_RT_PRIORITY])
4955 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4956
4957 if (tb[IFA_PROTO])
4958 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4959
4960 cfg.valid_lft = INFINITY_LIFE_TIME;
4961 cfg.preferred_lft = INFINITY_LIFE_TIME;
4962
4963 if (tb[IFA_CACHEINFO]) {
4964 struct ifa_cacheinfo *ci;
4965
4966 ci = nla_data(tb[IFA_CACHEINFO]);
4967 cfg.valid_lft = ci->ifa_valid;
4968 cfg.preferred_lft = ci->ifa_prefered;
4969 }
4970
4971 dev = __dev_get_by_index(net, ifm->ifa_index);
4972 if (!dev) {
4973 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
4974 return -ENODEV;
4975 }
4976
4977 if (tb[IFA_FLAGS])
4978 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4979 else
4980 cfg.ifa_flags = ifm->ifa_flags;
4981
4982 /* We ignore other flags so far. */
4983 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4984 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4985 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4986
4987 idev = ipv6_find_idev(dev);
4988 if (IS_ERR(idev))
4989 return PTR_ERR(idev);
4990
4991 if (!ipv6_allow_optimistic_dad(net, idev))
4992 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4993
4994 if (cfg.ifa_flags & IFA_F_NODAD &&
4995 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4996 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4997 return -EINVAL;
4998 }
4999
5000 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5001 if (!ifa) {
5002 /*
5003 * It would be best to check for !NLM_F_CREATE here but
5004 * userspace already relies on not having to provide this.
5005 */
5006 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5007 }
5008
5009 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5010 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5011 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5012 err = -EEXIST;
5013 } else {
5014 err = inet6_addr_modify(net, ifa, &cfg);
5015 }
5016
5017 in6_ifa_put(ifa);
5018
5019 return err;
5020 }
5021
put_ifaddrmsg(struct nlmsghdr * nlh,u8 prefixlen,u32 flags,u8 scope,int ifindex)5022 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5023 u8 scope, int ifindex)
5024 {
5025 struct ifaddrmsg *ifm;
5026
5027 ifm = nlmsg_data(nlh);
5028 ifm->ifa_family = AF_INET6;
5029 ifm->ifa_prefixlen = prefixlen;
5030 ifm->ifa_flags = flags;
5031 ifm->ifa_scope = scope;
5032 ifm->ifa_index = ifindex;
5033 }
5034
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)5035 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5036 unsigned long tstamp, u32 preferred, u32 valid)
5037 {
5038 struct ifa_cacheinfo ci;
5039
5040 ci.cstamp = cstamp_delta(cstamp);
5041 ci.tstamp = cstamp_delta(tstamp);
5042 ci.ifa_prefered = preferred;
5043 ci.ifa_valid = valid;
5044
5045 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5046 }
5047
rt_scope(int ifa_scope)5048 static inline int rt_scope(int ifa_scope)
5049 {
5050 if (ifa_scope & IFA_HOST)
5051 return RT_SCOPE_HOST;
5052 else if (ifa_scope & IFA_LINK)
5053 return RT_SCOPE_LINK;
5054 else if (ifa_scope & IFA_SITE)
5055 return RT_SCOPE_SITE;
5056 else
5057 return RT_SCOPE_UNIVERSE;
5058 }
5059
inet6_ifaddr_msgsize(void)5060 static inline int inet6_ifaddr_msgsize(void)
5061 {
5062 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5063 + nla_total_size(16) /* IFA_LOCAL */
5064 + nla_total_size(16) /* IFA_ADDRESS */
5065 + nla_total_size(sizeof(struct ifa_cacheinfo))
5066 + nla_total_size(4) /* IFA_FLAGS */
5067 + nla_total_size(1) /* IFA_PROTO */
5068 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5069 }
5070
5071 enum addr_type_t {
5072 UNICAST_ADDR,
5073 MULTICAST_ADDR,
5074 ANYCAST_ADDR,
5075 };
5076
5077 struct inet6_fill_args {
5078 u32 portid;
5079 u32 seq;
5080 int event;
5081 unsigned int flags;
5082 int netnsid;
5083 int ifindex;
5084 enum addr_type_t type;
5085 };
5086
inet6_fill_ifaddr(struct sk_buff * skb,struct inet6_ifaddr * ifa,struct inet6_fill_args * args)5087 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5088 struct inet6_fill_args *args)
5089 {
5090 struct nlmsghdr *nlh;
5091 u32 preferred, valid;
5092
5093 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5094 sizeof(struct ifaddrmsg), args->flags);
5095 if (!nlh)
5096 return -EMSGSIZE;
5097
5098 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5099 ifa->idev->dev->ifindex);
5100
5101 if (args->netnsid >= 0 &&
5102 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5103 goto error;
5104
5105 spin_lock_bh(&ifa->lock);
5106 if (!((ifa->flags&IFA_F_PERMANENT) &&
5107 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5108 preferred = ifa->prefered_lft;
5109 valid = ifa->valid_lft;
5110 if (preferred != INFINITY_LIFE_TIME) {
5111 long tval = (jiffies - ifa->tstamp)/HZ;
5112 if (preferred > tval)
5113 preferred -= tval;
5114 else
5115 preferred = 0;
5116 if (valid != INFINITY_LIFE_TIME) {
5117 if (valid > tval)
5118 valid -= tval;
5119 else
5120 valid = 0;
5121 }
5122 }
5123 } else {
5124 preferred = INFINITY_LIFE_TIME;
5125 valid = INFINITY_LIFE_TIME;
5126 }
5127 spin_unlock_bh(&ifa->lock);
5128
5129 if (!ipv6_addr_any(&ifa->peer_addr)) {
5130 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5131 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5132 goto error;
5133 } else
5134 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5135 goto error;
5136
5137 if (ifa->rt_priority &&
5138 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5139 goto error;
5140
5141 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5142 goto error;
5143
5144 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5145 goto error;
5146
5147 if (ifa->ifa_proto &&
5148 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5149 goto error;
5150
5151 nlmsg_end(skb, nlh);
5152 return 0;
5153
5154 error:
5155 nlmsg_cancel(skb, nlh);
5156 return -EMSGSIZE;
5157 }
5158
inet6_fill_ifmcaddr(struct sk_buff * skb,struct ifmcaddr6 * ifmca,struct inet6_fill_args * args)5159 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5160 struct inet6_fill_args *args)
5161 {
5162 struct nlmsghdr *nlh;
5163 u8 scope = RT_SCOPE_UNIVERSE;
5164 int ifindex = ifmca->idev->dev->ifindex;
5165
5166 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5167 scope = RT_SCOPE_SITE;
5168
5169 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5170 sizeof(struct ifaddrmsg), args->flags);
5171 if (!nlh)
5172 return -EMSGSIZE;
5173
5174 if (args->netnsid >= 0 &&
5175 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5176 nlmsg_cancel(skb, nlh);
5177 return -EMSGSIZE;
5178 }
5179
5180 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5181 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5182 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5183 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5184 nlmsg_cancel(skb, nlh);
5185 return -EMSGSIZE;
5186 }
5187
5188 nlmsg_end(skb, nlh);
5189 return 0;
5190 }
5191
inet6_fill_ifacaddr(struct sk_buff * skb,struct ifacaddr6 * ifaca,struct inet6_fill_args * args)5192 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5193 struct inet6_fill_args *args)
5194 {
5195 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5196 int ifindex = dev ? dev->ifindex : 1;
5197 struct nlmsghdr *nlh;
5198 u8 scope = RT_SCOPE_UNIVERSE;
5199
5200 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5201 scope = RT_SCOPE_SITE;
5202
5203 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5204 sizeof(struct ifaddrmsg), args->flags);
5205 if (!nlh)
5206 return -EMSGSIZE;
5207
5208 if (args->netnsid >= 0 &&
5209 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5210 nlmsg_cancel(skb, nlh);
5211 return -EMSGSIZE;
5212 }
5213
5214 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5215 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5216 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5217 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5218 nlmsg_cancel(skb, nlh);
5219 return -EMSGSIZE;
5220 }
5221
5222 nlmsg_end(skb, nlh);
5223 return 0;
5224 }
5225
5226 /* 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)5227 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5228 struct netlink_callback *cb, int s_ip_idx,
5229 struct inet6_fill_args *fillargs)
5230 {
5231 struct ifmcaddr6 *ifmca;
5232 struct ifacaddr6 *ifaca;
5233 int ip_idx = 0;
5234 int err = 1;
5235
5236 read_lock_bh(&idev->lock);
5237 switch (fillargs->type) {
5238 case UNICAST_ADDR: {
5239 struct inet6_ifaddr *ifa;
5240 fillargs->event = RTM_NEWADDR;
5241
5242 /* unicast address incl. temp addr */
5243 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5244 if (ip_idx < s_ip_idx)
5245 goto next;
5246 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5247 if (err < 0)
5248 break;
5249 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5250 next:
5251 ip_idx++;
5252 }
5253 break;
5254 }
5255 case MULTICAST_ADDR:
5256 read_unlock_bh(&idev->lock);
5257 fillargs->event = RTM_GETMULTICAST;
5258
5259 /* multicast address */
5260 for (ifmca = rtnl_dereference(idev->mc_list);
5261 ifmca;
5262 ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5263 if (ip_idx < s_ip_idx)
5264 continue;
5265 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5266 if (err < 0)
5267 break;
5268 }
5269 read_lock_bh(&idev->lock);
5270 break;
5271 case ANYCAST_ADDR:
5272 fillargs->event = RTM_GETANYCAST;
5273 /* anycast address */
5274 for (ifaca = idev->ac_list; ifaca;
5275 ifaca = ifaca->aca_next, ip_idx++) {
5276 if (ip_idx < s_ip_idx)
5277 continue;
5278 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5279 if (err < 0)
5280 break;
5281 }
5282 break;
5283 default:
5284 break;
5285 }
5286 read_unlock_bh(&idev->lock);
5287 cb->args[2] = ip_idx;
5288 return err;
5289 }
5290
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)5291 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5292 struct inet6_fill_args *fillargs,
5293 struct net **tgt_net, struct sock *sk,
5294 struct netlink_callback *cb)
5295 {
5296 struct netlink_ext_ack *extack = cb->extack;
5297 struct nlattr *tb[IFA_MAX+1];
5298 struct ifaddrmsg *ifm;
5299 int err, i;
5300
5301 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5302 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5303 return -EINVAL;
5304 }
5305
5306 ifm = nlmsg_data(nlh);
5307 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5308 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5309 return -EINVAL;
5310 }
5311
5312 fillargs->ifindex = ifm->ifa_index;
5313 if (fillargs->ifindex) {
5314 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5315 fillargs->flags |= NLM_F_DUMP_FILTERED;
5316 }
5317
5318 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5319 ifa_ipv6_policy, extack);
5320 if (err < 0)
5321 return err;
5322
5323 for (i = 0; i <= IFA_MAX; ++i) {
5324 if (!tb[i])
5325 continue;
5326
5327 if (i == IFA_TARGET_NETNSID) {
5328 struct net *net;
5329
5330 fillargs->netnsid = nla_get_s32(tb[i]);
5331 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5332 if (IS_ERR(net)) {
5333 fillargs->netnsid = -1;
5334 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5335 return PTR_ERR(net);
5336 }
5337 *tgt_net = net;
5338 } else {
5339 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5340 return -EINVAL;
5341 }
5342 }
5343
5344 return 0;
5345 }
5346
inet6_dump_addr(struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type)5347 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5348 enum addr_type_t type)
5349 {
5350 const struct nlmsghdr *nlh = cb->nlh;
5351 struct inet6_fill_args fillargs = {
5352 .portid = NETLINK_CB(cb->skb).portid,
5353 .seq = cb->nlh->nlmsg_seq,
5354 .flags = NLM_F_MULTI,
5355 .netnsid = -1,
5356 .type = type,
5357 };
5358 struct net *tgt_net = sock_net(skb->sk);
5359 int idx, s_idx, s_ip_idx;
5360 int h, s_h;
5361 struct net_device *dev;
5362 struct inet6_dev *idev;
5363 struct hlist_head *head;
5364 int err = 0;
5365
5366 s_h = cb->args[0];
5367 s_idx = idx = cb->args[1];
5368 s_ip_idx = cb->args[2];
5369
5370 if (cb->strict_check) {
5371 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5372 skb->sk, cb);
5373 if (err < 0)
5374 goto put_tgt_net;
5375
5376 err = 0;
5377 if (fillargs.ifindex) {
5378 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5379 if (!dev) {
5380 err = -ENODEV;
5381 goto put_tgt_net;
5382 }
5383 idev = __in6_dev_get(dev);
5384 if (idev) {
5385 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5386 &fillargs);
5387 if (err > 0)
5388 err = 0;
5389 }
5390 goto put_tgt_net;
5391 }
5392 }
5393
5394 rcu_read_lock();
5395 cb->seq = inet6_base_seq(tgt_net);
5396 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5397 idx = 0;
5398 head = &tgt_net->dev_index_head[h];
5399 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5400 if (idx < s_idx)
5401 goto cont;
5402 if (h > s_h || idx > s_idx)
5403 s_ip_idx = 0;
5404 idev = __in6_dev_get(dev);
5405 if (!idev)
5406 goto cont;
5407
5408 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5409 &fillargs) < 0)
5410 goto done;
5411 cont:
5412 idx++;
5413 }
5414 }
5415 done:
5416 rcu_read_unlock();
5417 cb->args[0] = h;
5418 cb->args[1] = idx;
5419 put_tgt_net:
5420 if (fillargs.netnsid >= 0)
5421 put_net(tgt_net);
5422
5423 return skb->len ? : err;
5424 }
5425
inet6_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)5426 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5427 {
5428 enum addr_type_t type = UNICAST_ADDR;
5429
5430 return inet6_dump_addr(skb, cb, type);
5431 }
5432
inet6_dump_ifmcaddr(struct sk_buff * skb,struct netlink_callback * cb)5433 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5434 {
5435 enum addr_type_t type = MULTICAST_ADDR;
5436
5437 return inet6_dump_addr(skb, cb, type);
5438 }
5439
5440
inet6_dump_ifacaddr(struct sk_buff * skb,struct netlink_callback * cb)5441 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5442 {
5443 enum addr_type_t type = ANYCAST_ADDR;
5444
5445 return inet6_dump_addr(skb, cb, type);
5446 }
5447
inet6_rtm_valid_getaddr_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)5448 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5449 const struct nlmsghdr *nlh,
5450 struct nlattr **tb,
5451 struct netlink_ext_ack *extack)
5452 {
5453 struct ifaddrmsg *ifm;
5454 int i, err;
5455
5456 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5457 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5458 return -EINVAL;
5459 }
5460
5461 if (!netlink_strict_get_check(skb))
5462 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5463 ifa_ipv6_policy, extack);
5464
5465 ifm = nlmsg_data(nlh);
5466 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5467 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5468 return -EINVAL;
5469 }
5470
5471 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5472 ifa_ipv6_policy, extack);
5473 if (err)
5474 return err;
5475
5476 for (i = 0; i <= IFA_MAX; i++) {
5477 if (!tb[i])
5478 continue;
5479
5480 switch (i) {
5481 case IFA_TARGET_NETNSID:
5482 case IFA_ADDRESS:
5483 case IFA_LOCAL:
5484 break;
5485 default:
5486 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5487 return -EINVAL;
5488 }
5489 }
5490
5491 return 0;
5492 }
5493
inet6_rtm_getaddr(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5494 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5495 struct netlink_ext_ack *extack)
5496 {
5497 struct net *tgt_net = sock_net(in_skb->sk);
5498 struct inet6_fill_args fillargs = {
5499 .portid = NETLINK_CB(in_skb).portid,
5500 .seq = nlh->nlmsg_seq,
5501 .event = RTM_NEWADDR,
5502 .flags = 0,
5503 .netnsid = -1,
5504 };
5505 struct ifaddrmsg *ifm;
5506 struct nlattr *tb[IFA_MAX+1];
5507 struct in6_addr *addr = NULL, *peer;
5508 struct net_device *dev = NULL;
5509 struct inet6_ifaddr *ifa;
5510 struct sk_buff *skb;
5511 int err;
5512
5513 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5514 if (err < 0)
5515 return err;
5516
5517 if (tb[IFA_TARGET_NETNSID]) {
5518 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5519
5520 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5521 fillargs.netnsid);
5522 if (IS_ERR(tgt_net))
5523 return PTR_ERR(tgt_net);
5524 }
5525
5526 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5527 if (!addr) {
5528 err = -EINVAL;
5529 goto errout;
5530 }
5531 ifm = nlmsg_data(nlh);
5532 if (ifm->ifa_index)
5533 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5534
5535 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5536 if (!ifa) {
5537 err = -EADDRNOTAVAIL;
5538 goto errout;
5539 }
5540
5541 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5542 if (!skb) {
5543 err = -ENOBUFS;
5544 goto errout_ifa;
5545 }
5546
5547 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5548 if (err < 0) {
5549 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5550 WARN_ON(err == -EMSGSIZE);
5551 kfree_skb(skb);
5552 goto errout_ifa;
5553 }
5554 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5555 errout_ifa:
5556 in6_ifa_put(ifa);
5557 errout:
5558 dev_put(dev);
5559 if (fillargs.netnsid >= 0)
5560 put_net(tgt_net);
5561
5562 return err;
5563 }
5564
inet6_ifa_notify(int event,struct inet6_ifaddr * ifa)5565 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5566 {
5567 struct sk_buff *skb;
5568 struct net *net = dev_net(ifa->idev->dev);
5569 struct inet6_fill_args fillargs = {
5570 .portid = 0,
5571 .seq = 0,
5572 .event = event,
5573 .flags = 0,
5574 .netnsid = -1,
5575 };
5576 int err = -ENOBUFS;
5577
5578 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5579 if (!skb)
5580 goto errout;
5581
5582 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5583 if (err < 0) {
5584 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5585 WARN_ON(err == -EMSGSIZE);
5586 kfree_skb(skb);
5587 goto errout;
5588 }
5589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5590 return;
5591 errout:
5592 if (err < 0)
5593 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5594 }
5595
ipv6_store_devconf(struct ipv6_devconf * cnf,__s32 * array,int bytes)5596 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5597 __s32 *array, int bytes)
5598 {
5599 BUG_ON(bytes < (DEVCONF_MAX * 4));
5600
5601 memset(array, 0, bytes);
5602 array[DEVCONF_FORWARDING] = cnf->forwarding;
5603 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5604 array[DEVCONF_MTU6] = cnf->mtu6;
5605 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5606 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5607 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5608 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5609 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5610 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5611 jiffies_to_msecs(cnf->rtr_solicit_interval);
5612 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5613 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5614 array[DEVCONF_RTR_SOLICIT_DELAY] =
5615 jiffies_to_msecs(cnf->rtr_solicit_delay);
5616 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5617 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5618 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5619 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5620 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5621 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5622 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5623 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5624 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5625 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5626 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5627 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5628 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5629 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5630 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5631 #ifdef CONFIG_IPV6_ROUTER_PREF
5632 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5633 array[DEVCONF_RTR_PROBE_INTERVAL] =
5634 jiffies_to_msecs(cnf->rtr_probe_interval);
5635 #ifdef CONFIG_IPV6_ROUTE_INFO
5636 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5637 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5638 #endif
5639 #endif
5640 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5641 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5642 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5643 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5644 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5645 #endif
5646 #ifdef CONFIG_IPV6_MROUTE
5647 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5648 #endif
5649 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5650 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5651 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5652 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5653 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5654 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5655 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5656 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5657 /* we omit DEVCONF_STABLE_SECRET for now */
5658 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5659 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5660 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5661 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5662 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5663 #ifdef CONFIG_IPV6_SEG6_HMAC
5664 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5665 #endif
5666 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5667 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5668 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5669 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5670 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5671 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5672 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5673 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5674 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5675 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
5676 array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft;
5677 }
5678
inet6_ifla6_size(void)5679 static inline size_t inet6_ifla6_size(void)
5680 {
5681 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5682 + nla_total_size(sizeof(struct ifla_cacheinfo))
5683 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5684 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5685 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5686 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5687 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5688 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5689 + 0;
5690 }
5691
inet6_if_nlmsg_size(void)5692 static inline size_t inet6_if_nlmsg_size(void)
5693 {
5694 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5695 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5696 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5697 + nla_total_size(4) /* IFLA_MTU */
5698 + nla_total_size(4) /* IFLA_LINK */
5699 + nla_total_size(1) /* IFLA_OPERSTATE */
5700 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5701 }
5702
__snmp6_fill_statsdev(u64 * stats,atomic_long_t * mib,int bytes)5703 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5704 int bytes)
5705 {
5706 int i;
5707 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5708 BUG_ON(pad < 0);
5709
5710 /* Use put_unaligned() because stats may not be aligned for u64. */
5711 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5712 for (i = 1; i < ICMP6_MIB_MAX; i++)
5713 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5714
5715 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5716 }
5717
__snmp6_fill_stats64(u64 * stats,void __percpu * mib,int bytes,size_t syncpoff)5718 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5719 int bytes, size_t syncpoff)
5720 {
5721 int i, c;
5722 u64 buff[IPSTATS_MIB_MAX];
5723 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5724
5725 BUG_ON(pad < 0);
5726
5727 memset(buff, 0, sizeof(buff));
5728 buff[0] = IPSTATS_MIB_MAX;
5729
5730 for_each_possible_cpu(c) {
5731 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5732 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5733 }
5734
5735 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5736 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5737 }
5738
snmp6_fill_stats(u64 * stats,struct inet6_dev * idev,int attrtype,int bytes)5739 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5740 int bytes)
5741 {
5742 switch (attrtype) {
5743 case IFLA_INET6_STATS:
5744 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5745 offsetof(struct ipstats_mib, syncp));
5746 break;
5747 case IFLA_INET6_ICMP6STATS:
5748 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5749 break;
5750 }
5751 }
5752
inet6_fill_ifla6_attrs(struct sk_buff * skb,struct inet6_dev * idev,u32 ext_filter_mask)5753 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5754 u32 ext_filter_mask)
5755 {
5756 struct nlattr *nla;
5757 struct ifla_cacheinfo ci;
5758
5759 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5760 goto nla_put_failure;
5761 ci.max_reasm_len = IPV6_MAXPLEN;
5762 ci.tstamp = cstamp_delta(idev->tstamp);
5763 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5764 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5765 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5766 goto nla_put_failure;
5767 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5768 if (!nla)
5769 goto nla_put_failure;
5770 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5771
5772 /* XXX - MC not implemented */
5773
5774 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5775 return 0;
5776
5777 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5778 if (!nla)
5779 goto nla_put_failure;
5780 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5781
5782 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5783 if (!nla)
5784 goto nla_put_failure;
5785 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5786
5787 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5788 if (!nla)
5789 goto nla_put_failure;
5790 read_lock_bh(&idev->lock);
5791 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5792 read_unlock_bh(&idev->lock);
5793
5794 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5795 goto nla_put_failure;
5796
5797 if (idev->ra_mtu &&
5798 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5799 goto nla_put_failure;
5800
5801 return 0;
5802
5803 nla_put_failure:
5804 return -EMSGSIZE;
5805 }
5806
inet6_get_link_af_size(const struct net_device * dev,u32 ext_filter_mask)5807 static size_t inet6_get_link_af_size(const struct net_device *dev,
5808 u32 ext_filter_mask)
5809 {
5810 if (!__in6_dev_get(dev))
5811 return 0;
5812
5813 return inet6_ifla6_size();
5814 }
5815
inet6_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)5816 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5817 u32 ext_filter_mask)
5818 {
5819 struct inet6_dev *idev = __in6_dev_get(dev);
5820
5821 if (!idev)
5822 return -ENODATA;
5823
5824 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5825 return -EMSGSIZE;
5826
5827 return 0;
5828 }
5829
inet6_set_iftoken(struct inet6_dev * idev,struct in6_addr * token,struct netlink_ext_ack * extack)5830 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5831 struct netlink_ext_ack *extack)
5832 {
5833 struct inet6_ifaddr *ifp;
5834 struct net_device *dev = idev->dev;
5835 bool clear_token, update_rs = false;
5836 struct in6_addr ll_addr;
5837
5838 ASSERT_RTNL();
5839
5840 if (!token)
5841 return -EINVAL;
5842
5843 if (dev->flags & IFF_LOOPBACK) {
5844 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5845 return -EINVAL;
5846 }
5847
5848 if (dev->flags & IFF_NOARP) {
5849 NL_SET_ERR_MSG_MOD(extack,
5850 "Device does not do neighbour discovery");
5851 return -EINVAL;
5852 }
5853
5854 if (!ipv6_accept_ra(idev)) {
5855 NL_SET_ERR_MSG_MOD(extack,
5856 "Router advertisement is disabled on device");
5857 return -EINVAL;
5858 }
5859
5860 if (idev->cnf.rtr_solicits == 0) {
5861 NL_SET_ERR_MSG(extack,
5862 "Router solicitation is disabled on device");
5863 return -EINVAL;
5864 }
5865
5866 write_lock_bh(&idev->lock);
5867
5868 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5869 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5870
5871 write_unlock_bh(&idev->lock);
5872
5873 clear_token = ipv6_addr_any(token);
5874 if (clear_token)
5875 goto update_lft;
5876
5877 if (!idev->dead && (idev->if_flags & IF_READY) &&
5878 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5879 IFA_F_OPTIMISTIC)) {
5880 /* If we're not ready, then normal ifup will take care
5881 * of this. Otherwise, we need to request our rs here.
5882 */
5883 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5884 update_rs = true;
5885 }
5886
5887 update_lft:
5888 write_lock_bh(&idev->lock);
5889
5890 if (update_rs) {
5891 idev->if_flags |= IF_RS_SENT;
5892 idev->rs_interval = rfc3315_s14_backoff_init(
5893 idev->cnf.rtr_solicit_interval);
5894 idev->rs_probes = 1;
5895 addrconf_mod_rs_timer(idev, idev->rs_interval);
5896 }
5897
5898 /* Well, that's kinda nasty ... */
5899 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5900 spin_lock(&ifp->lock);
5901 if (ifp->tokenized) {
5902 ifp->valid_lft = 0;
5903 ifp->prefered_lft = 0;
5904 }
5905 spin_unlock(&ifp->lock);
5906 }
5907
5908 write_unlock_bh(&idev->lock);
5909 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5910 addrconf_verify_rtnl(dev_net(dev));
5911 return 0;
5912 }
5913
5914 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5915 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5916 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5917 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5918 .reject_message =
5919 "IFLA_INET6_RA_MTU can not be set" },
5920 };
5921
check_addr_gen_mode(int mode)5922 static int check_addr_gen_mode(int mode)
5923 {
5924 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5925 mode != IN6_ADDR_GEN_MODE_NONE &&
5926 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5927 mode != IN6_ADDR_GEN_MODE_RANDOM)
5928 return -EINVAL;
5929 return 1;
5930 }
5931
check_stable_privacy(struct inet6_dev * idev,struct net * net,int mode)5932 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5933 int mode)
5934 {
5935 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5936 !idev->cnf.stable_secret.initialized &&
5937 !net->ipv6.devconf_dflt->stable_secret.initialized)
5938 return -EINVAL;
5939 return 1;
5940 }
5941
inet6_validate_link_af(const struct net_device * dev,const struct nlattr * nla,struct netlink_ext_ack * extack)5942 static int inet6_validate_link_af(const struct net_device *dev,
5943 const struct nlattr *nla,
5944 struct netlink_ext_ack *extack)
5945 {
5946 struct nlattr *tb[IFLA_INET6_MAX + 1];
5947 struct inet6_dev *idev = NULL;
5948 int err;
5949
5950 if (dev) {
5951 idev = __in6_dev_get(dev);
5952 if (!idev)
5953 return -EAFNOSUPPORT;
5954 }
5955
5956 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5957 inet6_af_policy, extack);
5958 if (err)
5959 return err;
5960
5961 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5962 return -EINVAL;
5963
5964 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5965 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5966
5967 if (check_addr_gen_mode(mode) < 0)
5968 return -EINVAL;
5969 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5970 return -EINVAL;
5971 }
5972
5973 return 0;
5974 }
5975
inet6_set_link_af(struct net_device * dev,const struct nlattr * nla,struct netlink_ext_ack * extack)5976 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5977 struct netlink_ext_ack *extack)
5978 {
5979 struct inet6_dev *idev = __in6_dev_get(dev);
5980 struct nlattr *tb[IFLA_INET6_MAX + 1];
5981 int err;
5982
5983 if (!idev)
5984 return -EAFNOSUPPORT;
5985
5986 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5987 return -EINVAL;
5988
5989 if (tb[IFLA_INET6_TOKEN]) {
5990 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5991 extack);
5992 if (err)
5993 return err;
5994 }
5995
5996 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5997 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5998
5999 idev->cnf.addr_gen_mode = mode;
6000 }
6001
6002 return 0;
6003 }
6004
inet6_fill_ifinfo(struct sk_buff * skb,struct inet6_dev * idev,u32 portid,u32 seq,int event,unsigned int flags)6005 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6006 u32 portid, u32 seq, int event, unsigned int flags)
6007 {
6008 struct net_device *dev = idev->dev;
6009 struct ifinfomsg *hdr;
6010 struct nlmsghdr *nlh;
6011 void *protoinfo;
6012
6013 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6014 if (!nlh)
6015 return -EMSGSIZE;
6016
6017 hdr = nlmsg_data(nlh);
6018 hdr->ifi_family = AF_INET6;
6019 hdr->__ifi_pad = 0;
6020 hdr->ifi_type = dev->type;
6021 hdr->ifi_index = dev->ifindex;
6022 hdr->ifi_flags = dev_get_flags(dev);
6023 hdr->ifi_change = 0;
6024
6025 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6026 (dev->addr_len &&
6027 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6028 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
6029 (dev->ifindex != dev_get_iflink(dev) &&
6030 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
6031 nla_put_u8(skb, IFLA_OPERSTATE,
6032 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6033 goto nla_put_failure;
6034 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6035 if (!protoinfo)
6036 goto nla_put_failure;
6037
6038 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6039 goto nla_put_failure;
6040
6041 nla_nest_end(skb, protoinfo);
6042 nlmsg_end(skb, nlh);
6043 return 0;
6044
6045 nla_put_failure:
6046 nlmsg_cancel(skb, nlh);
6047 return -EMSGSIZE;
6048 }
6049
inet6_valid_dump_ifinfo(const struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6050 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6051 struct netlink_ext_ack *extack)
6052 {
6053 struct ifinfomsg *ifm;
6054
6055 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6056 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6057 return -EINVAL;
6058 }
6059
6060 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6061 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6062 return -EINVAL;
6063 }
6064
6065 ifm = nlmsg_data(nlh);
6066 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6067 ifm->ifi_change || ifm->ifi_index) {
6068 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6069 return -EINVAL;
6070 }
6071
6072 return 0;
6073 }
6074
inet6_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)6075 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6076 {
6077 struct net *net = sock_net(skb->sk);
6078 int h, s_h;
6079 int idx = 0, s_idx;
6080 struct net_device *dev;
6081 struct inet6_dev *idev;
6082 struct hlist_head *head;
6083
6084 /* only requests using strict checking can pass data to
6085 * influence the dump
6086 */
6087 if (cb->strict_check) {
6088 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6089
6090 if (err < 0)
6091 return err;
6092 }
6093
6094 s_h = cb->args[0];
6095 s_idx = cb->args[1];
6096
6097 rcu_read_lock();
6098 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6099 idx = 0;
6100 head = &net->dev_index_head[h];
6101 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6102 if (idx < s_idx)
6103 goto cont;
6104 idev = __in6_dev_get(dev);
6105 if (!idev)
6106 goto cont;
6107 if (inet6_fill_ifinfo(skb, idev,
6108 NETLINK_CB(cb->skb).portid,
6109 cb->nlh->nlmsg_seq,
6110 RTM_NEWLINK, NLM_F_MULTI) < 0)
6111 goto out;
6112 cont:
6113 idx++;
6114 }
6115 }
6116 out:
6117 rcu_read_unlock();
6118 cb->args[1] = idx;
6119 cb->args[0] = h;
6120
6121 return skb->len;
6122 }
6123
inet6_ifinfo_notify(int event,struct inet6_dev * idev)6124 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6125 {
6126 struct sk_buff *skb;
6127 struct net *net = dev_net(idev->dev);
6128 int err = -ENOBUFS;
6129
6130 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6131 if (!skb)
6132 goto errout;
6133
6134 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6135 if (err < 0) {
6136 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6137 WARN_ON(err == -EMSGSIZE);
6138 kfree_skb(skb);
6139 goto errout;
6140 }
6141 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6142 return;
6143 errout:
6144 if (err < 0)
6145 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6146 }
6147
inet6_prefix_nlmsg_size(void)6148 static inline size_t inet6_prefix_nlmsg_size(void)
6149 {
6150 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6151 + nla_total_size(sizeof(struct in6_addr))
6152 + nla_total_size(sizeof(struct prefix_cacheinfo));
6153 }
6154
inet6_fill_prefix(struct sk_buff * skb,struct inet6_dev * idev,struct prefix_info * pinfo,u32 portid,u32 seq,int event,unsigned int flags)6155 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6156 struct prefix_info *pinfo, u32 portid, u32 seq,
6157 int event, unsigned int flags)
6158 {
6159 struct prefixmsg *pmsg;
6160 struct nlmsghdr *nlh;
6161 struct prefix_cacheinfo ci;
6162
6163 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6164 if (!nlh)
6165 return -EMSGSIZE;
6166
6167 pmsg = nlmsg_data(nlh);
6168 pmsg->prefix_family = AF_INET6;
6169 pmsg->prefix_pad1 = 0;
6170 pmsg->prefix_pad2 = 0;
6171 pmsg->prefix_ifindex = idev->dev->ifindex;
6172 pmsg->prefix_len = pinfo->prefix_len;
6173 pmsg->prefix_type = pinfo->type;
6174 pmsg->prefix_pad3 = 0;
6175 pmsg->prefix_flags = pinfo->flags;
6176
6177 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6178 goto nla_put_failure;
6179 ci.preferred_time = ntohl(pinfo->prefered);
6180 ci.valid_time = ntohl(pinfo->valid);
6181 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6182 goto nla_put_failure;
6183 nlmsg_end(skb, nlh);
6184 return 0;
6185
6186 nla_put_failure:
6187 nlmsg_cancel(skb, nlh);
6188 return -EMSGSIZE;
6189 }
6190
inet6_prefix_notify(int event,struct inet6_dev * idev,struct prefix_info * pinfo)6191 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6192 struct prefix_info *pinfo)
6193 {
6194 struct sk_buff *skb;
6195 struct net *net = dev_net(idev->dev);
6196 int err = -ENOBUFS;
6197
6198 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6199 if (!skb)
6200 goto errout;
6201
6202 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6203 if (err < 0) {
6204 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6205 WARN_ON(err == -EMSGSIZE);
6206 kfree_skb(skb);
6207 goto errout;
6208 }
6209 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6210 return;
6211 errout:
6212 if (err < 0)
6213 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6214 }
6215
__ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6216 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6217 {
6218 struct net *net = dev_net(ifp->idev->dev);
6219
6220 if (event)
6221 ASSERT_RTNL();
6222
6223 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6224
6225 switch (event) {
6226 case RTM_NEWADDR:
6227 /*
6228 * If the address was optimistic we inserted the route at the
6229 * start of our DAD process, so we don't need to do it again.
6230 * If the device was taken down in the middle of the DAD
6231 * cycle there is a race where we could get here without a
6232 * host route, so nothing to insert. That will be fixed when
6233 * the device is brought up.
6234 */
6235 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6236 ip6_ins_rt(net, ifp->rt);
6237 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6238 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6239 &ifp->addr, ifp->idev->dev->name);
6240 }
6241
6242 if (ifp->idev->cnf.forwarding)
6243 addrconf_join_anycast(ifp);
6244 if (!ipv6_addr_any(&ifp->peer_addr))
6245 addrconf_prefix_route(&ifp->peer_addr, 128,
6246 ifp->rt_priority, ifp->idev->dev,
6247 0, 0, GFP_ATOMIC);
6248 break;
6249 case RTM_DELADDR:
6250 if (ifp->idev->cnf.forwarding)
6251 addrconf_leave_anycast(ifp);
6252 addrconf_leave_solict(ifp->idev, &ifp->addr);
6253 if (!ipv6_addr_any(&ifp->peer_addr)) {
6254 struct fib6_info *rt;
6255
6256 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6257 ifp->idev->dev, 0, 0,
6258 false);
6259 if (rt)
6260 ip6_del_rt(net, rt, false);
6261 }
6262 if (ifp->rt) {
6263 ip6_del_rt(net, ifp->rt, false);
6264 ifp->rt = NULL;
6265 }
6266 rt_genid_bump_ipv6(net);
6267 break;
6268 }
6269 atomic_inc(&net->ipv6.dev_addr_genid);
6270 }
6271
ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6272 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6273 {
6274 if (likely(ifp->idev->dead == 0))
6275 __ipv6_ifa_notify(event, ifp);
6276 }
6277
6278 #ifdef CONFIG_SYSCTL
6279
addrconf_sysctl_forward(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6280 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6281 void *buffer, size_t *lenp, loff_t *ppos)
6282 {
6283 int *valp = ctl->data;
6284 int val = *valp;
6285 loff_t pos = *ppos;
6286 struct ctl_table lctl;
6287 int ret;
6288
6289 /*
6290 * ctl->data points to idev->cnf.forwarding, we should
6291 * not modify it until we get the rtnl lock.
6292 */
6293 lctl = *ctl;
6294 lctl.data = &val;
6295
6296 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6297
6298 if (write)
6299 ret = addrconf_fixup_forwarding(ctl, valp, val);
6300 if (ret)
6301 *ppos = pos;
6302 return ret;
6303 }
6304
addrconf_sysctl_mtu(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6305 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6306 void *buffer, size_t *lenp, loff_t *ppos)
6307 {
6308 struct inet6_dev *idev = ctl->extra1;
6309 int min_mtu = IPV6_MIN_MTU;
6310 struct ctl_table lctl;
6311
6312 lctl = *ctl;
6313 lctl.extra1 = &min_mtu;
6314 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6315
6316 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6317 }
6318
dev_disable_change(struct inet6_dev * idev)6319 static void dev_disable_change(struct inet6_dev *idev)
6320 {
6321 struct netdev_notifier_info info;
6322
6323 if (!idev || !idev->dev)
6324 return;
6325
6326 netdev_notifier_info_init(&info, idev->dev);
6327 if (idev->cnf.disable_ipv6)
6328 addrconf_notify(NULL, NETDEV_DOWN, &info);
6329 else
6330 addrconf_notify(NULL, NETDEV_UP, &info);
6331 }
6332
addrconf_disable_change(struct net * net,__s32 newf)6333 static void addrconf_disable_change(struct net *net, __s32 newf)
6334 {
6335 struct net_device *dev;
6336 struct inet6_dev *idev;
6337
6338 for_each_netdev(net, dev) {
6339 idev = __in6_dev_get(dev);
6340 if (idev) {
6341 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6342
6343 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6344 if (changed)
6345 dev_disable_change(idev);
6346 }
6347 }
6348 }
6349
addrconf_disable_ipv6(struct ctl_table * table,int * p,int newf)6350 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6351 {
6352 struct net *net;
6353 int old;
6354
6355 if (!rtnl_trylock())
6356 return restart_syscall();
6357
6358 net = (struct net *)table->extra2;
6359 old = *p;
6360 WRITE_ONCE(*p, newf);
6361
6362 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6363 rtnl_unlock();
6364 return 0;
6365 }
6366
6367 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6368 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6369 addrconf_disable_change(net, newf);
6370 } else if ((!newf) ^ (!old))
6371 dev_disable_change((struct inet6_dev *)table->extra1);
6372
6373 rtnl_unlock();
6374 return 0;
6375 }
6376
addrconf_sysctl_disable(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6377 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6378 void *buffer, size_t *lenp, loff_t *ppos)
6379 {
6380 int *valp = ctl->data;
6381 int val = *valp;
6382 loff_t pos = *ppos;
6383 struct ctl_table lctl;
6384 int ret;
6385
6386 /*
6387 * ctl->data points to idev->cnf.disable_ipv6, we should
6388 * not modify it until we get the rtnl lock.
6389 */
6390 lctl = *ctl;
6391 lctl.data = &val;
6392
6393 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6394
6395 if (write)
6396 ret = addrconf_disable_ipv6(ctl, valp, val);
6397 if (ret)
6398 *ppos = pos;
6399 return ret;
6400 }
6401
addrconf_sysctl_proxy_ndp(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6402 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6403 void *buffer, size_t *lenp, loff_t *ppos)
6404 {
6405 int *valp = ctl->data;
6406 int ret;
6407 int old, new;
6408
6409 old = *valp;
6410 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6411 new = *valp;
6412
6413 if (write && old != new) {
6414 struct net *net = ctl->extra2;
6415
6416 if (!rtnl_trylock())
6417 return restart_syscall();
6418
6419 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6420 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6421 NETCONFA_PROXY_NEIGH,
6422 NETCONFA_IFINDEX_DEFAULT,
6423 net->ipv6.devconf_dflt);
6424 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6425 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6426 NETCONFA_PROXY_NEIGH,
6427 NETCONFA_IFINDEX_ALL,
6428 net->ipv6.devconf_all);
6429 else {
6430 struct inet6_dev *idev = ctl->extra1;
6431
6432 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6433 NETCONFA_PROXY_NEIGH,
6434 idev->dev->ifindex,
6435 &idev->cnf);
6436 }
6437 rtnl_unlock();
6438 }
6439
6440 return ret;
6441 }
6442
addrconf_sysctl_addr_gen_mode(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6443 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6444 void *buffer, size_t *lenp,
6445 loff_t *ppos)
6446 {
6447 int ret = 0;
6448 u32 new_val;
6449 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6450 struct net *net = (struct net *)ctl->extra2;
6451 struct ctl_table tmp = {
6452 .data = &new_val,
6453 .maxlen = sizeof(new_val),
6454 .mode = ctl->mode,
6455 };
6456
6457 if (!rtnl_trylock())
6458 return restart_syscall();
6459
6460 new_val = *((u32 *)ctl->data);
6461
6462 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6463 if (ret != 0)
6464 goto out;
6465
6466 if (write) {
6467 if (check_addr_gen_mode(new_val) < 0) {
6468 ret = -EINVAL;
6469 goto out;
6470 }
6471
6472 if (idev) {
6473 if (check_stable_privacy(idev, net, new_val) < 0) {
6474 ret = -EINVAL;
6475 goto out;
6476 }
6477
6478 if (idev->cnf.addr_gen_mode != new_val) {
6479 idev->cnf.addr_gen_mode = new_val;
6480 addrconf_init_auto_addrs(idev->dev);
6481 }
6482 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6483 struct net_device *dev;
6484
6485 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6486 for_each_netdev(net, dev) {
6487 idev = __in6_dev_get(dev);
6488 if (idev &&
6489 idev->cnf.addr_gen_mode != new_val) {
6490 idev->cnf.addr_gen_mode = new_val;
6491 addrconf_init_auto_addrs(idev->dev);
6492 }
6493 }
6494 }
6495
6496 *((u32 *)ctl->data) = new_val;
6497 }
6498
6499 out:
6500 rtnl_unlock();
6501
6502 return ret;
6503 }
6504
addrconf_sysctl_stable_secret(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6505 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6506 void *buffer, size_t *lenp,
6507 loff_t *ppos)
6508 {
6509 int err;
6510 struct in6_addr addr;
6511 char str[IPV6_MAX_STRLEN];
6512 struct ctl_table lctl = *ctl;
6513 struct net *net = ctl->extra2;
6514 struct ipv6_stable_secret *secret = ctl->data;
6515
6516 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6517 return -EIO;
6518
6519 lctl.maxlen = IPV6_MAX_STRLEN;
6520 lctl.data = str;
6521
6522 if (!rtnl_trylock())
6523 return restart_syscall();
6524
6525 if (!write && !secret->initialized) {
6526 err = -EIO;
6527 goto out;
6528 }
6529
6530 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6531 if (err >= sizeof(str)) {
6532 err = -EIO;
6533 goto out;
6534 }
6535
6536 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6537 if (err || !write)
6538 goto out;
6539
6540 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6541 err = -EIO;
6542 goto out;
6543 }
6544
6545 secret->initialized = true;
6546 secret->secret = addr;
6547
6548 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6549 struct net_device *dev;
6550
6551 for_each_netdev(net, dev) {
6552 struct inet6_dev *idev = __in6_dev_get(dev);
6553
6554 if (idev) {
6555 idev->cnf.addr_gen_mode =
6556 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6557 }
6558 }
6559 } else {
6560 struct inet6_dev *idev = ctl->extra1;
6561
6562 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6563 }
6564
6565 out:
6566 rtnl_unlock();
6567
6568 return err;
6569 }
6570
6571 static
addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6572 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6573 int write, void *buffer,
6574 size_t *lenp,
6575 loff_t *ppos)
6576 {
6577 int *valp = ctl->data;
6578 int val = *valp;
6579 loff_t pos = *ppos;
6580 struct ctl_table lctl;
6581 int ret;
6582
6583 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6584 * we should not modify it until we get the rtnl lock.
6585 */
6586 lctl = *ctl;
6587 lctl.data = &val;
6588
6589 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6590
6591 if (write)
6592 ret = addrconf_fixup_linkdown(ctl, valp, val);
6593 if (ret)
6594 *ppos = pos;
6595 return ret;
6596 }
6597
6598 static
addrconf_set_nopolicy(struct rt6_info * rt,int action)6599 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6600 {
6601 if (rt) {
6602 if (action)
6603 rt->dst.flags |= DST_NOPOLICY;
6604 else
6605 rt->dst.flags &= ~DST_NOPOLICY;
6606 }
6607 }
6608
6609 static
addrconf_disable_policy_idev(struct inet6_dev * idev,int val)6610 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6611 {
6612 struct inet6_ifaddr *ifa;
6613
6614 read_lock_bh(&idev->lock);
6615 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6616 spin_lock(&ifa->lock);
6617 if (ifa->rt) {
6618 /* host routes only use builtin fib6_nh */
6619 struct fib6_nh *nh = ifa->rt->fib6_nh;
6620 int cpu;
6621
6622 rcu_read_lock();
6623 ifa->rt->dst_nopolicy = val ? true : false;
6624 if (nh->rt6i_pcpu) {
6625 for_each_possible_cpu(cpu) {
6626 struct rt6_info **rtp;
6627
6628 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6629 addrconf_set_nopolicy(*rtp, val);
6630 }
6631 }
6632 rcu_read_unlock();
6633 }
6634 spin_unlock(&ifa->lock);
6635 }
6636 read_unlock_bh(&idev->lock);
6637 }
6638
6639 static
addrconf_disable_policy(struct ctl_table * ctl,int * valp,int val)6640 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6641 {
6642 struct inet6_dev *idev;
6643 struct net *net;
6644
6645 if (!rtnl_trylock())
6646 return restart_syscall();
6647
6648 *valp = val;
6649
6650 net = (struct net *)ctl->extra2;
6651 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6652 rtnl_unlock();
6653 return 0;
6654 }
6655
6656 if (valp == &net->ipv6.devconf_all->disable_policy) {
6657 struct net_device *dev;
6658
6659 for_each_netdev(net, dev) {
6660 idev = __in6_dev_get(dev);
6661 if (idev)
6662 addrconf_disable_policy_idev(idev, val);
6663 }
6664 } else {
6665 idev = (struct inet6_dev *)ctl->extra1;
6666 addrconf_disable_policy_idev(idev, val);
6667 }
6668
6669 rtnl_unlock();
6670 return 0;
6671 }
6672
addrconf_sysctl_disable_policy(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6673 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6674 void *buffer, size_t *lenp, loff_t *ppos)
6675 {
6676 int *valp = ctl->data;
6677 int val = *valp;
6678 loff_t pos = *ppos;
6679 struct ctl_table lctl;
6680 int ret;
6681
6682 lctl = *ctl;
6683 lctl.data = &val;
6684 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6685
6686 if (write && (*valp != val))
6687 ret = addrconf_disable_policy(ctl, valp, val);
6688
6689 if (ret)
6690 *ppos = pos;
6691
6692 return ret;
6693 }
6694
6695 static int minus_one = -1;
6696 static const int two_five_five = 255;
6697 static u32 ioam6_if_id_max = U16_MAX;
6698
6699 static const struct ctl_table addrconf_sysctl[] = {
6700 {
6701 .procname = "forwarding",
6702 .data = &ipv6_devconf.forwarding,
6703 .maxlen = sizeof(int),
6704 .mode = 0644,
6705 .proc_handler = addrconf_sysctl_forward,
6706 },
6707 {
6708 .procname = "hop_limit",
6709 .data = &ipv6_devconf.hop_limit,
6710 .maxlen = sizeof(int),
6711 .mode = 0644,
6712 .proc_handler = proc_dointvec_minmax,
6713 .extra1 = (void *)SYSCTL_ONE,
6714 .extra2 = (void *)&two_five_five,
6715 },
6716 {
6717 .procname = "mtu",
6718 .data = &ipv6_devconf.mtu6,
6719 .maxlen = sizeof(int),
6720 .mode = 0644,
6721 .proc_handler = addrconf_sysctl_mtu,
6722 },
6723 {
6724 .procname = "accept_ra",
6725 .data = &ipv6_devconf.accept_ra,
6726 .maxlen = sizeof(int),
6727 .mode = 0644,
6728 .proc_handler = proc_dointvec,
6729 },
6730 {
6731 .procname = "accept_redirects",
6732 .data = &ipv6_devconf.accept_redirects,
6733 .maxlen = sizeof(int),
6734 .mode = 0644,
6735 .proc_handler = proc_dointvec,
6736 },
6737 {
6738 .procname = "autoconf",
6739 .data = &ipv6_devconf.autoconf,
6740 .maxlen = sizeof(int),
6741 .mode = 0644,
6742 .proc_handler = proc_dointvec,
6743 },
6744 {
6745 .procname = "dad_transmits",
6746 .data = &ipv6_devconf.dad_transmits,
6747 .maxlen = sizeof(int),
6748 .mode = 0644,
6749 .proc_handler = proc_dointvec,
6750 },
6751 {
6752 .procname = "router_solicitations",
6753 .data = &ipv6_devconf.rtr_solicits,
6754 .maxlen = sizeof(int),
6755 .mode = 0644,
6756 .proc_handler = proc_dointvec_minmax,
6757 .extra1 = &minus_one,
6758 },
6759 {
6760 .procname = "router_solicitation_interval",
6761 .data = &ipv6_devconf.rtr_solicit_interval,
6762 .maxlen = sizeof(int),
6763 .mode = 0644,
6764 .proc_handler = proc_dointvec_jiffies,
6765 },
6766 {
6767 .procname = "router_solicitation_max_interval",
6768 .data = &ipv6_devconf.rtr_solicit_max_interval,
6769 .maxlen = sizeof(int),
6770 .mode = 0644,
6771 .proc_handler = proc_dointvec_jiffies,
6772 },
6773 {
6774 .procname = "router_solicitation_delay",
6775 .data = &ipv6_devconf.rtr_solicit_delay,
6776 .maxlen = sizeof(int),
6777 .mode = 0644,
6778 .proc_handler = proc_dointvec_jiffies,
6779 },
6780 {
6781 .procname = "force_mld_version",
6782 .data = &ipv6_devconf.force_mld_version,
6783 .maxlen = sizeof(int),
6784 .mode = 0644,
6785 .proc_handler = proc_dointvec,
6786 },
6787 {
6788 .procname = "mldv1_unsolicited_report_interval",
6789 .data =
6790 &ipv6_devconf.mldv1_unsolicited_report_interval,
6791 .maxlen = sizeof(int),
6792 .mode = 0644,
6793 .proc_handler = proc_dointvec_ms_jiffies,
6794 },
6795 {
6796 .procname = "mldv2_unsolicited_report_interval",
6797 .data =
6798 &ipv6_devconf.mldv2_unsolicited_report_interval,
6799 .maxlen = sizeof(int),
6800 .mode = 0644,
6801 .proc_handler = proc_dointvec_ms_jiffies,
6802 },
6803 {
6804 .procname = "use_tempaddr",
6805 .data = &ipv6_devconf.use_tempaddr,
6806 .maxlen = sizeof(int),
6807 .mode = 0644,
6808 .proc_handler = proc_dointvec,
6809 },
6810 {
6811 .procname = "temp_valid_lft",
6812 .data = &ipv6_devconf.temp_valid_lft,
6813 .maxlen = sizeof(int),
6814 .mode = 0644,
6815 .proc_handler = proc_dointvec,
6816 },
6817 {
6818 .procname = "temp_prefered_lft",
6819 .data = &ipv6_devconf.temp_prefered_lft,
6820 .maxlen = sizeof(int),
6821 .mode = 0644,
6822 .proc_handler = proc_dointvec,
6823 },
6824 {
6825 .procname = "regen_max_retry",
6826 .data = &ipv6_devconf.regen_max_retry,
6827 .maxlen = sizeof(int),
6828 .mode = 0644,
6829 .proc_handler = proc_dointvec,
6830 },
6831 {
6832 .procname = "max_desync_factor",
6833 .data = &ipv6_devconf.max_desync_factor,
6834 .maxlen = sizeof(int),
6835 .mode = 0644,
6836 .proc_handler = proc_dointvec,
6837 },
6838 {
6839 .procname = "max_addresses",
6840 .data = &ipv6_devconf.max_addresses,
6841 .maxlen = sizeof(int),
6842 .mode = 0644,
6843 .proc_handler = proc_dointvec,
6844 },
6845 {
6846 .procname = "accept_ra_defrtr",
6847 .data = &ipv6_devconf.accept_ra_defrtr,
6848 .maxlen = sizeof(int),
6849 .mode = 0644,
6850 .proc_handler = proc_dointvec,
6851 },
6852 {
6853 .procname = "ra_defrtr_metric",
6854 .data = &ipv6_devconf.ra_defrtr_metric,
6855 .maxlen = sizeof(u32),
6856 .mode = 0644,
6857 .proc_handler = proc_douintvec_minmax,
6858 .extra1 = (void *)SYSCTL_ONE,
6859 },
6860 {
6861 .procname = "accept_ra_min_hop_limit",
6862 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6863 .maxlen = sizeof(int),
6864 .mode = 0644,
6865 .proc_handler = proc_dointvec,
6866 },
6867 {
6868 .procname = "accept_ra_min_lft",
6869 .data = &ipv6_devconf.accept_ra_min_lft,
6870 .maxlen = sizeof(int),
6871 .mode = 0644,
6872 .proc_handler = proc_dointvec,
6873 },
6874 {
6875 .procname = "accept_ra_pinfo",
6876 .data = &ipv6_devconf.accept_ra_pinfo,
6877 .maxlen = sizeof(int),
6878 .mode = 0644,
6879 .proc_handler = proc_dointvec,
6880 },
6881 #ifdef CONFIG_IPV6_ROUTER_PREF
6882 {
6883 .procname = "accept_ra_rtr_pref",
6884 .data = &ipv6_devconf.accept_ra_rtr_pref,
6885 .maxlen = sizeof(int),
6886 .mode = 0644,
6887 .proc_handler = proc_dointvec,
6888 },
6889 {
6890 .procname = "router_probe_interval",
6891 .data = &ipv6_devconf.rtr_probe_interval,
6892 .maxlen = sizeof(int),
6893 .mode = 0644,
6894 .proc_handler = proc_dointvec_jiffies,
6895 },
6896 #ifdef CONFIG_IPV6_ROUTE_INFO
6897 {
6898 .procname = "accept_ra_rt_info_min_plen",
6899 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6900 .maxlen = sizeof(int),
6901 .mode = 0644,
6902 .proc_handler = proc_dointvec,
6903 },
6904 {
6905 .procname = "accept_ra_rt_info_max_plen",
6906 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6907 .maxlen = sizeof(int),
6908 .mode = 0644,
6909 .proc_handler = proc_dointvec,
6910 },
6911 #endif
6912 #endif
6913 {
6914 .procname = "proxy_ndp",
6915 .data = &ipv6_devconf.proxy_ndp,
6916 .maxlen = sizeof(int),
6917 .mode = 0644,
6918 .proc_handler = addrconf_sysctl_proxy_ndp,
6919 },
6920 {
6921 .procname = "accept_source_route",
6922 .data = &ipv6_devconf.accept_source_route,
6923 .maxlen = sizeof(int),
6924 .mode = 0644,
6925 .proc_handler = proc_dointvec,
6926 },
6927 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6928 {
6929 .procname = "optimistic_dad",
6930 .data = &ipv6_devconf.optimistic_dad,
6931 .maxlen = sizeof(int),
6932 .mode = 0644,
6933 .proc_handler = proc_dointvec,
6934 },
6935 {
6936 .procname = "use_optimistic",
6937 .data = &ipv6_devconf.use_optimistic,
6938 .maxlen = sizeof(int),
6939 .mode = 0644,
6940 .proc_handler = proc_dointvec,
6941 },
6942 #endif
6943 #ifdef CONFIG_IPV6_MROUTE
6944 {
6945 .procname = "mc_forwarding",
6946 .data = &ipv6_devconf.mc_forwarding,
6947 .maxlen = sizeof(int),
6948 .mode = 0444,
6949 .proc_handler = proc_dointvec,
6950 },
6951 #endif
6952 {
6953 .procname = "disable_ipv6",
6954 .data = &ipv6_devconf.disable_ipv6,
6955 .maxlen = sizeof(int),
6956 .mode = 0644,
6957 .proc_handler = addrconf_sysctl_disable,
6958 },
6959 {
6960 .procname = "accept_dad",
6961 .data = &ipv6_devconf.accept_dad,
6962 .maxlen = sizeof(int),
6963 .mode = 0644,
6964 .proc_handler = proc_dointvec,
6965 },
6966 {
6967 .procname = "force_tllao",
6968 .data = &ipv6_devconf.force_tllao,
6969 .maxlen = sizeof(int),
6970 .mode = 0644,
6971 .proc_handler = proc_dointvec
6972 },
6973 {
6974 .procname = "ndisc_notify",
6975 .data = &ipv6_devconf.ndisc_notify,
6976 .maxlen = sizeof(int),
6977 .mode = 0644,
6978 .proc_handler = proc_dointvec
6979 },
6980 {
6981 .procname = "suppress_frag_ndisc",
6982 .data = &ipv6_devconf.suppress_frag_ndisc,
6983 .maxlen = sizeof(int),
6984 .mode = 0644,
6985 .proc_handler = proc_dointvec
6986 },
6987 {
6988 .procname = "accept_ra_from_local",
6989 .data = &ipv6_devconf.accept_ra_from_local,
6990 .maxlen = sizeof(int),
6991 .mode = 0644,
6992 .proc_handler = proc_dointvec,
6993 },
6994 {
6995 .procname = "accept_ra_mtu",
6996 .data = &ipv6_devconf.accept_ra_mtu,
6997 .maxlen = sizeof(int),
6998 .mode = 0644,
6999 .proc_handler = proc_dointvec,
7000 },
7001 {
7002 .procname = "stable_secret",
7003 .data = &ipv6_devconf.stable_secret,
7004 .maxlen = IPV6_MAX_STRLEN,
7005 .mode = 0600,
7006 .proc_handler = addrconf_sysctl_stable_secret,
7007 },
7008 {
7009 .procname = "use_oif_addrs_only",
7010 .data = &ipv6_devconf.use_oif_addrs_only,
7011 .maxlen = sizeof(int),
7012 .mode = 0644,
7013 .proc_handler = proc_dointvec,
7014 },
7015 {
7016 .procname = "ignore_routes_with_linkdown",
7017 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7018 .maxlen = sizeof(int),
7019 .mode = 0644,
7020 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7021 },
7022 {
7023 .procname = "drop_unicast_in_l2_multicast",
7024 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7025 .maxlen = sizeof(int),
7026 .mode = 0644,
7027 .proc_handler = proc_dointvec,
7028 },
7029 {
7030 .procname = "drop_unsolicited_na",
7031 .data = &ipv6_devconf.drop_unsolicited_na,
7032 .maxlen = sizeof(int),
7033 .mode = 0644,
7034 .proc_handler = proc_dointvec,
7035 },
7036 {
7037 .procname = "keep_addr_on_down",
7038 .data = &ipv6_devconf.keep_addr_on_down,
7039 .maxlen = sizeof(int),
7040 .mode = 0644,
7041 .proc_handler = proc_dointvec,
7042
7043 },
7044 {
7045 .procname = "seg6_enabled",
7046 .data = &ipv6_devconf.seg6_enabled,
7047 .maxlen = sizeof(int),
7048 .mode = 0644,
7049 .proc_handler = proc_dointvec,
7050 },
7051 #ifdef CONFIG_IPV6_SEG6_HMAC
7052 {
7053 .procname = "seg6_require_hmac",
7054 .data = &ipv6_devconf.seg6_require_hmac,
7055 .maxlen = sizeof(int),
7056 .mode = 0644,
7057 .proc_handler = proc_dointvec,
7058 },
7059 #endif
7060 {
7061 .procname = "enhanced_dad",
7062 .data = &ipv6_devconf.enhanced_dad,
7063 .maxlen = sizeof(int),
7064 .mode = 0644,
7065 .proc_handler = proc_dointvec,
7066 },
7067 {
7068 .procname = "addr_gen_mode",
7069 .data = &ipv6_devconf.addr_gen_mode,
7070 .maxlen = sizeof(int),
7071 .mode = 0644,
7072 .proc_handler = addrconf_sysctl_addr_gen_mode,
7073 },
7074 {
7075 .procname = "disable_policy",
7076 .data = &ipv6_devconf.disable_policy,
7077 .maxlen = sizeof(int),
7078 .mode = 0644,
7079 .proc_handler = addrconf_sysctl_disable_policy,
7080 },
7081 {
7082 .procname = "ndisc_tclass",
7083 .data = &ipv6_devconf.ndisc_tclass,
7084 .maxlen = sizeof(int),
7085 .mode = 0644,
7086 .proc_handler = proc_dointvec_minmax,
7087 .extra1 = (void *)SYSCTL_ZERO,
7088 .extra2 = (void *)&two_five_five,
7089 },
7090 {
7091 .procname = "rpl_seg_enabled",
7092 .data = &ipv6_devconf.rpl_seg_enabled,
7093 .maxlen = sizeof(int),
7094 .mode = 0644,
7095 .proc_handler = proc_dointvec,
7096 },
7097 {
7098 .procname = "ioam6_enabled",
7099 .data = &ipv6_devconf.ioam6_enabled,
7100 .maxlen = sizeof(u8),
7101 .mode = 0644,
7102 .proc_handler = proc_dou8vec_minmax,
7103 .extra1 = (void *)SYSCTL_ZERO,
7104 .extra2 = (void *)SYSCTL_ONE,
7105 },
7106 {
7107 .procname = "ioam6_id",
7108 .data = &ipv6_devconf.ioam6_id,
7109 .maxlen = sizeof(u32),
7110 .mode = 0644,
7111 .proc_handler = proc_douintvec_minmax,
7112 .extra1 = (void *)SYSCTL_ZERO,
7113 .extra2 = (void *)&ioam6_if_id_max,
7114 },
7115 {
7116 .procname = "ioam6_id_wide",
7117 .data = &ipv6_devconf.ioam6_id_wide,
7118 .maxlen = sizeof(u32),
7119 .mode = 0644,
7120 .proc_handler = proc_douintvec,
7121 },
7122 {
7123 .procname = "ndisc_evict_nocarrier",
7124 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7125 .maxlen = sizeof(u8),
7126 .mode = 0644,
7127 .proc_handler = proc_dou8vec_minmax,
7128 .extra1 = (void *)SYSCTL_ZERO,
7129 .extra2 = (void *)SYSCTL_ONE,
7130 },
7131 {
7132 .procname = "accept_untracked_na",
7133 .data = &ipv6_devconf.accept_untracked_na,
7134 .maxlen = sizeof(int),
7135 .mode = 0644,
7136 .proc_handler = proc_dointvec_minmax,
7137 .extra1 = SYSCTL_ZERO,
7138 .extra2 = SYSCTL_TWO,
7139 },
7140 {
7141 /* sentinel */
7142 }
7143 };
7144
__addrconf_sysctl_register(struct net * net,char * dev_name,struct inet6_dev * idev,struct ipv6_devconf * p)7145 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7146 struct inet6_dev *idev, struct ipv6_devconf *p)
7147 {
7148 int i, ifindex;
7149 struct ctl_table *table;
7150 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7151
7152 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7153 if (!table)
7154 goto out;
7155
7156 for (i = 0; table[i].data; i++) {
7157 table[i].data += (char *)p - (char *)&ipv6_devconf;
7158 /* If one of these is already set, then it is not safe to
7159 * overwrite either of them: this makes proc_dointvec_minmax
7160 * usable.
7161 */
7162 if (!table[i].extra1 && !table[i].extra2) {
7163 table[i].extra1 = idev; /* embedded; no ref */
7164 table[i].extra2 = net;
7165 }
7166 }
7167
7168 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7169
7170 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7171 ARRAY_SIZE(addrconf_sysctl));
7172 if (!p->sysctl_header)
7173 goto free;
7174
7175 if (!strcmp(dev_name, "all"))
7176 ifindex = NETCONFA_IFINDEX_ALL;
7177 else if (!strcmp(dev_name, "default"))
7178 ifindex = NETCONFA_IFINDEX_DEFAULT;
7179 else
7180 ifindex = idev->dev->ifindex;
7181 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7182 ifindex, p);
7183 return 0;
7184
7185 free:
7186 kfree(table);
7187 out:
7188 return -ENOBUFS;
7189 }
7190
__addrconf_sysctl_unregister(struct net * net,struct ipv6_devconf * p,int ifindex)7191 static void __addrconf_sysctl_unregister(struct net *net,
7192 struct ipv6_devconf *p, int ifindex)
7193 {
7194 struct ctl_table *table;
7195
7196 if (!p->sysctl_header)
7197 return;
7198
7199 table = p->sysctl_header->ctl_table_arg;
7200 unregister_net_sysctl_table(p->sysctl_header);
7201 p->sysctl_header = NULL;
7202 kfree(table);
7203
7204 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7205 }
7206
addrconf_sysctl_register(struct inet6_dev * idev)7207 static int addrconf_sysctl_register(struct inet6_dev *idev)
7208 {
7209 int err;
7210
7211 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7212 return -EINVAL;
7213
7214 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7215 &ndisc_ifinfo_sysctl_change);
7216 if (err)
7217 return err;
7218 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7219 idev, &idev->cnf);
7220 if (err)
7221 neigh_sysctl_unregister(idev->nd_parms);
7222
7223 return err;
7224 }
7225
addrconf_sysctl_unregister(struct inet6_dev * idev)7226 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7227 {
7228 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7229 idev->dev->ifindex);
7230 neigh_sysctl_unregister(idev->nd_parms);
7231 }
7232
7233
7234 #endif
7235
addrconf_init_net(struct net * net)7236 static int __net_init addrconf_init_net(struct net *net)
7237 {
7238 int err = -ENOMEM;
7239 struct ipv6_devconf *all, *dflt;
7240
7241 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7242 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7243 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7244 sizeof(struct hlist_head),
7245 GFP_KERNEL);
7246 if (!net->ipv6.inet6_addr_lst)
7247 goto err_alloc_addr;
7248
7249 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7250 if (!all)
7251 goto err_alloc_all;
7252
7253 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7254 if (!dflt)
7255 goto err_alloc_dflt;
7256
7257 if (!net_eq(net, &init_net)) {
7258 switch (net_inherit_devconf()) {
7259 case 1: /* copy from init_net */
7260 memcpy(all, init_net.ipv6.devconf_all,
7261 sizeof(ipv6_devconf));
7262 memcpy(dflt, init_net.ipv6.devconf_dflt,
7263 sizeof(ipv6_devconf_dflt));
7264 break;
7265 case 3: /* copy from the current netns */
7266 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7267 sizeof(ipv6_devconf));
7268 memcpy(dflt,
7269 current->nsproxy->net_ns->ipv6.devconf_dflt,
7270 sizeof(ipv6_devconf_dflt));
7271 break;
7272 case 0:
7273 case 2:
7274 /* use compiled values */
7275 break;
7276 }
7277 }
7278
7279 /* these will be inherited by all namespaces */
7280 dflt->autoconf = ipv6_defaults.autoconf;
7281 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7282
7283 dflt->stable_secret.initialized = false;
7284 all->stable_secret.initialized = false;
7285
7286 net->ipv6.devconf_all = all;
7287 net->ipv6.devconf_dflt = dflt;
7288
7289 #ifdef CONFIG_SYSCTL
7290 err = __addrconf_sysctl_register(net, "all", NULL, all);
7291 if (err < 0)
7292 goto err_reg_all;
7293
7294 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7295 if (err < 0)
7296 goto err_reg_dflt;
7297 #endif
7298 return 0;
7299
7300 #ifdef CONFIG_SYSCTL
7301 err_reg_dflt:
7302 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7303 err_reg_all:
7304 kfree(dflt);
7305 net->ipv6.devconf_dflt = NULL;
7306 #endif
7307 err_alloc_dflt:
7308 kfree(all);
7309 net->ipv6.devconf_all = NULL;
7310 err_alloc_all:
7311 kfree(net->ipv6.inet6_addr_lst);
7312 err_alloc_addr:
7313 return err;
7314 }
7315
addrconf_exit_net(struct net * net)7316 static void __net_exit addrconf_exit_net(struct net *net)
7317 {
7318 int i;
7319
7320 #ifdef CONFIG_SYSCTL
7321 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7322 NETCONFA_IFINDEX_DEFAULT);
7323 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7324 NETCONFA_IFINDEX_ALL);
7325 #endif
7326 kfree(net->ipv6.devconf_dflt);
7327 net->ipv6.devconf_dflt = NULL;
7328 kfree(net->ipv6.devconf_all);
7329 net->ipv6.devconf_all = NULL;
7330
7331 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7332 /*
7333 * Check hash table, then free it.
7334 */
7335 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7336 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7337
7338 kfree(net->ipv6.inet6_addr_lst);
7339 net->ipv6.inet6_addr_lst = NULL;
7340 }
7341
7342 static struct pernet_operations addrconf_ops = {
7343 .init = addrconf_init_net,
7344 .exit = addrconf_exit_net,
7345 };
7346
7347 static struct rtnl_af_ops inet6_ops __read_mostly = {
7348 .family = AF_INET6,
7349 .fill_link_af = inet6_fill_link_af,
7350 .get_link_af_size = inet6_get_link_af_size,
7351 .validate_link_af = inet6_validate_link_af,
7352 .set_link_af = inet6_set_link_af,
7353 };
7354
7355 /*
7356 * Init / cleanup code
7357 */
7358
addrconf_init(void)7359 int __init addrconf_init(void)
7360 {
7361 struct inet6_dev *idev;
7362 int err;
7363
7364 err = ipv6_addr_label_init();
7365 if (err < 0) {
7366 pr_crit("%s: cannot initialize default policy table: %d\n",
7367 __func__, err);
7368 goto out;
7369 }
7370
7371 err = register_pernet_subsys(&addrconf_ops);
7372 if (err < 0)
7373 goto out_addrlabel;
7374
7375 addrconf_wq = create_workqueue("ipv6_addrconf");
7376 if (!addrconf_wq) {
7377 err = -ENOMEM;
7378 goto out_nowq;
7379 }
7380
7381 rtnl_lock();
7382 idev = ipv6_add_dev(blackhole_netdev);
7383 rtnl_unlock();
7384 if (IS_ERR(idev)) {
7385 err = PTR_ERR(idev);
7386 goto errlo;
7387 }
7388
7389 ip6_route_init_special_entries();
7390
7391 register_netdevice_notifier(&ipv6_dev_notf);
7392
7393 addrconf_verify(&init_net);
7394
7395 rtnl_af_register(&inet6_ops);
7396
7397 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7398 NULL, inet6_dump_ifinfo, 0);
7399 if (err < 0)
7400 goto errout;
7401
7402 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7403 inet6_rtm_newaddr, NULL, 0);
7404 if (err < 0)
7405 goto errout;
7406 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7407 inet6_rtm_deladdr, NULL, 0);
7408 if (err < 0)
7409 goto errout;
7410 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7411 inet6_rtm_getaddr, inet6_dump_ifaddr,
7412 RTNL_FLAG_DOIT_UNLOCKED);
7413 if (err < 0)
7414 goto errout;
7415 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7416 NULL, inet6_dump_ifmcaddr, 0);
7417 if (err < 0)
7418 goto errout;
7419 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7420 NULL, inet6_dump_ifacaddr, 0);
7421 if (err < 0)
7422 goto errout;
7423 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7424 inet6_netconf_get_devconf,
7425 inet6_netconf_dump_devconf,
7426 RTNL_FLAG_DOIT_UNLOCKED);
7427 if (err < 0)
7428 goto errout;
7429 err = ipv6_addr_label_rtnl_register();
7430 if (err < 0)
7431 goto errout;
7432
7433 return 0;
7434 errout:
7435 rtnl_unregister_all(PF_INET6);
7436 rtnl_af_unregister(&inet6_ops);
7437 unregister_netdevice_notifier(&ipv6_dev_notf);
7438 errlo:
7439 destroy_workqueue(addrconf_wq);
7440 out_nowq:
7441 unregister_pernet_subsys(&addrconf_ops);
7442 out_addrlabel:
7443 ipv6_addr_label_cleanup();
7444 out:
7445 return err;
7446 }
7447
addrconf_cleanup(void)7448 void addrconf_cleanup(void)
7449 {
7450 struct net_device *dev;
7451
7452 unregister_netdevice_notifier(&ipv6_dev_notf);
7453 unregister_pernet_subsys(&addrconf_ops);
7454 ipv6_addr_label_cleanup();
7455
7456 rtnl_af_unregister(&inet6_ops);
7457
7458 rtnl_lock();
7459
7460 /* clean dev list */
7461 for_each_netdev(&init_net, dev) {
7462 if (__in6_dev_get(dev) == NULL)
7463 continue;
7464 addrconf_ifdown(dev, true);
7465 }
7466 addrconf_ifdown(init_net.loopback_dev, true);
7467
7468 rtnl_unlock();
7469
7470 destroy_workqueue(addrconf_wq);
7471 }
7472