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/ip_tunnels.h>
67 #include <net/net_namespace.h>
68 #include <net/sock.h>
69 #include <net/snmp.h>
70
71 #include <net/6lowpan.h>
72 #include <net/firewire.h>
73 #include <net/ipv6.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
78 #include <net/tcp.h>
79 #include <net/ip.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <net/l3mdev.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
89
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
93 #include <linux/ioam6.h>
94
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
cstamp_delta(unsigned long cstamp)98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
rfc3315_s14_backoff_init(s32 irt)103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
rfc3315_s14_backoff_update(s32 rt,s32 mrt)111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
addrconf_sysctl_register(struct inet6_dev * idev)128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
addrconf_sysctl_unregister(struct inet6_dev * idev)133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141 static int ipv6_count_addresses(const struct inet6_dev *idev);
142 static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146 #define IN6_ADDR_HSIZE_SHIFT 8
147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148
149 static void addrconf_verify(struct net *net);
150 static void addrconf_verify_rtnl(struct net *net);
151
152 static struct workqueue_struct *addrconf_wq;
153
154 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
155 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
156
157 static void addrconf_type_change(struct net_device *dev,
158 unsigned long event);
159 static int addrconf_ifdown(struct net_device *dev, bool unregister);
160
161 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
162 int plen,
163 const struct net_device *dev,
164 u32 flags, u32 noflags,
165 bool no_gw);
166
167 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
168 static void addrconf_dad_work(struct work_struct *w);
169 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
170 bool send_na);
171 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
172 static void addrconf_rs_timer(struct timer_list *t);
173 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
174 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175
176 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
177 struct prefix_info *pinfo);
178
179 static struct ipv6_devconf ipv6_devconf __read_mostly = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .force_mld_version = 0,
187 .mldv1_unsolicited_report_interval = 10 * HZ,
188 .mldv2_unsolicited_report_interval = HZ,
189 .dad_transmits = 1,
190 .rtr_solicits = MAX_RTR_SOLICITATIONS,
191 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
192 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
193 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
194 .use_tempaddr = 0,
195 .temp_valid_lft = TEMP_VALID_LIFETIME,
196 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
197 .regen_min_advance = REGEN_MIN_ADVANCE,
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 .ra_honor_pio_life = 0,
240 .ra_honor_pio_pflag = 0,
241 };
242
243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_min_advance = REGEN_MIN_ADVANCE,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .ra_defrtr_metric = IP6_RT_PRIO_USER,
267 .accept_ra_from_local = 0,
268 .accept_ra_min_hop_limit= 1,
269 .accept_ra_min_lft = 0,
270 .accept_ra_pinfo = 1,
271 #ifdef CONFIG_IPV6_ROUTER_PREF
272 .accept_ra_rtr_pref = 1,
273 .rtr_probe_interval = 60 * HZ,
274 #ifdef CONFIG_IPV6_ROUTE_INFO
275 .accept_ra_rt_info_min_plen = 0,
276 .accept_ra_rt_info_max_plen = 0,
277 #endif
278 #endif
279 .proxy_ndp = 0,
280 .accept_source_route = 0, /* we do not accept RH0 by default. */
281 .disable_ipv6 = 0,
282 .accept_dad = 1,
283 .suppress_frag_ndisc = 1,
284 .accept_ra_mtu = 1,
285 .stable_secret = {
286 .initialized = false,
287 },
288 .use_oif_addrs_only = 0,
289 .ignore_routes_with_linkdown = 0,
290 .keep_addr_on_down = 0,
291 .seg6_enabled = 0,
292 #ifdef CONFIG_IPV6_SEG6_HMAC
293 .seg6_require_hmac = 0,
294 #endif
295 .enhanced_dad = 1,
296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
297 .disable_policy = 0,
298 .rpl_seg_enabled = 0,
299 .ioam6_enabled = 0,
300 .ioam6_id = IOAM6_DEFAULT_IF_ID,
301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
302 .ndisc_evict_nocarrier = 1,
303 .ra_honor_pio_life = 0,
304 .ra_honor_pio_pflag = 0,
305 };
306
307 /* Check if link is ready: is it up and is a valid qdisc available */
addrconf_link_ready(const struct net_device * dev)308 static inline bool addrconf_link_ready(const struct net_device *dev)
309 {
310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
311 }
312
addrconf_del_rs_timer(struct inet6_dev * idev)313 static void addrconf_del_rs_timer(struct inet6_dev *idev)
314 {
315 if (del_timer(&idev->rs_timer))
316 __in6_dev_put(idev);
317 }
318
addrconf_del_dad_work(struct inet6_ifaddr * ifp)319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
320 {
321 if (cancel_delayed_work(&ifp->dad_work))
322 __in6_ifa_put(ifp);
323 }
324
addrconf_mod_rs_timer(struct inet6_dev * idev,unsigned long when)325 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 unsigned long when)
327 {
328 if (!mod_timer(&idev->rs_timer, jiffies + when))
329 in6_dev_hold(idev);
330 }
331
addrconf_mod_dad_work(struct inet6_ifaddr * ifp,unsigned long delay)332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
334 {
335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
338 }
339
snmp6_alloc_dev(struct inet6_dev * idev)340 static int snmp6_alloc_dev(struct inet6_dev *idev)
341 {
342 int i;
343
344 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
345 if (!idev->stats.ipv6)
346 goto err_ip;
347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
352 }
353
354
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
358 goto err_icmp;
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL_ACCOUNT);
361 if (!idev->stats.icmpv6msgdev)
362 goto err_icmpmsg;
363
364 return 0;
365
366 err_icmpmsg:
367 kfree(idev->stats.icmpv6dev);
368 err_icmp:
369 free_percpu(idev->stats.ipv6);
370 err_ip:
371 return -ENOMEM;
372 }
373
ipv6_add_dev(struct net_device * dev)374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 {
376 struct inet6_dev *ndev;
377 int err = -ENOMEM;
378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
382 return ERR_PTR(-EINVAL);
383
384 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
385 if (!ndev)
386 return ERR_PTR(err);
387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
390 INIT_LIST_HEAD(&ndev->addr_list);
391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
393
394 if (ndev->cnf.stable_secret.initialized)
395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
396
397 ndev->cnf.mtu6 = dev->mtu;
398 ndev->ra_mtu = 0;
399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
400 if (!ndev->nd_parms) {
401 kfree(ndev);
402 return ERR_PTR(err);
403 }
404 if (ndev->cnf.forwarding)
405 dev_disable_lro(dev);
406 /* We refer to the device */
407 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
408
409 if (snmp6_alloc_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
411 __func__);
412 neigh_parms_release(&nd_tbl, ndev->nd_parms);
413 netdev_put(dev, &ndev->dev_tracker);
414 kfree(ndev);
415 return ERR_PTR(err);
416 }
417
418 if (dev != blackhole_netdev) {
419 if (snmp6_register_dev(ndev) < 0) {
420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
421 __func__, dev->name);
422 goto err_release;
423 }
424 }
425 /* One reference from device. */
426 refcount_set(&ndev->refcnt, 1);
427
428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
429 ndev->cnf.accept_dad = -1;
430
431 #if IS_ENABLED(CONFIG_IPV6_SIT)
432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
433 pr_info("%s: Disabled Multicast RS\n", dev->name);
434 ndev->cnf.rtr_solicits = 0;
435 }
436 #endif
437
438 INIT_LIST_HEAD(&ndev->tempaddr_list);
439 ndev->desync_factor = U32_MAX;
440 if ((dev->flags&IFF_LOOPBACK) ||
441 dev->type == ARPHRD_TUNNEL ||
442 dev->type == ARPHRD_TUNNEL6 ||
443 dev->type == ARPHRD_SIT ||
444 dev->type == ARPHRD_NONE) {
445 ndev->cnf.use_tempaddr = -1;
446 }
447
448 ndev->token = in6addr_any;
449
450 if (netif_running(dev) && addrconf_link_ready(dev))
451 ndev->if_flags |= IF_READY;
452
453 ipv6_mc_init_dev(ndev);
454 ndev->tstamp = jiffies;
455 if (dev != blackhole_netdev) {
456 err = addrconf_sysctl_register(ndev);
457 if (err) {
458 ipv6_mc_destroy_dev(ndev);
459 snmp6_unregister_dev(ndev);
460 goto err_release;
461 }
462 }
463 /* protected by rtnl_lock */
464 rcu_assign_pointer(dev->ip6_ptr, ndev);
465
466 if (dev != blackhole_netdev) {
467 /* Join interface-local all-node multicast group */
468 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
469
470 /* Join all-node multicast group */
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
472
473 /* Join all-router multicast group if forwarding is set */
474 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 }
477 return ndev;
478
479 err_release:
480 neigh_parms_release(&nd_tbl, ndev->nd_parms);
481 ndev->dead = 1;
482 in6_dev_finish_destroy(ndev);
483 return ERR_PTR(err);
484 }
485
ipv6_find_idev(struct net_device * dev)486 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
487 {
488 struct inet6_dev *idev;
489
490 ASSERT_RTNL();
491
492 idev = __in6_dev_get(dev);
493 if (!idev) {
494 idev = ipv6_add_dev(dev);
495 if (IS_ERR(idev))
496 return idev;
497 }
498
499 if (dev->flags&IFF_UP)
500 ipv6_mc_up(idev);
501 return idev;
502 }
503
inet6_netconf_msgsize_devconf(int type)504 static int inet6_netconf_msgsize_devconf(int type)
505 {
506 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
507 + nla_total_size(4); /* NETCONFA_IFINDEX */
508 bool all = false;
509
510 if (type == NETCONFA_ALL)
511 all = true;
512
513 if (all || type == NETCONFA_FORWARDING)
514 size += nla_total_size(4);
515 #ifdef CONFIG_IPV6_MROUTE
516 if (all || type == NETCONFA_MC_FORWARDING)
517 size += nla_total_size(4);
518 #endif
519 if (all || type == NETCONFA_PROXY_NEIGH)
520 size += nla_total_size(4);
521
522 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
523 size += nla_total_size(4);
524
525 return size;
526 }
527
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)528 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
529 struct ipv6_devconf *devconf, u32 portid,
530 u32 seq, int event, unsigned int flags,
531 int type)
532 {
533 struct nlmsghdr *nlh;
534 struct netconfmsg *ncm;
535 bool all = false;
536
537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
538 flags);
539 if (!nlh)
540 return -EMSGSIZE;
541
542 if (type == NETCONFA_ALL)
543 all = true;
544
545 ncm = nlmsg_data(nlh);
546 ncm->ncm_family = AF_INET6;
547
548 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
549 goto nla_put_failure;
550
551 if (!devconf)
552 goto out;
553
554 if ((all || type == NETCONFA_FORWARDING) &&
555 nla_put_s32(skb, NETCONFA_FORWARDING,
556 READ_ONCE(devconf->forwarding)) < 0)
557 goto nla_put_failure;
558 #ifdef CONFIG_IPV6_MROUTE
559 if ((all || type == NETCONFA_MC_FORWARDING) &&
560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 atomic_read(&devconf->mc_forwarding)) < 0)
562 goto nla_put_failure;
563 #endif
564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
566 READ_ONCE(devconf->proxy_ndp)) < 0)
567 goto nla_put_failure;
568
569 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
570 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
571 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0)
572 goto nla_put_failure;
573
574 out:
575 nlmsg_end(skb, nlh);
576 return 0;
577
578 nla_put_failure:
579 nlmsg_cancel(skb, nlh);
580 return -EMSGSIZE;
581 }
582
inet6_netconf_notify_devconf(struct net * net,int event,int type,int ifindex,struct ipv6_devconf * devconf)583 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
584 int ifindex, struct ipv6_devconf *devconf)
585 {
586 struct sk_buff *skb;
587 int err = -ENOBUFS;
588
589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
590 if (!skb)
591 goto errout;
592
593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
594 event, 0, type);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
602 return;
603 errout:
604 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
605 }
606
607 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
608 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
609 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
610 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
611 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
612 };
613
inet6_netconf_valid_get_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)614 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
615 const struct nlmsghdr *nlh,
616 struct nlattr **tb,
617 struct netlink_ext_ack *extack)
618 {
619 int i, err;
620
621 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
622 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
623 return -EINVAL;
624 }
625
626 if (!netlink_strict_get_check(skb))
627 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
628 tb, NETCONFA_MAX,
629 devconf_ipv6_policy, extack);
630
631 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
632 tb, NETCONFA_MAX,
633 devconf_ipv6_policy, extack);
634 if (err)
635 return err;
636
637 for (i = 0; i <= NETCONFA_MAX; i++) {
638 if (!tb[i])
639 continue;
640
641 switch (i) {
642 case NETCONFA_IFINDEX:
643 break;
644 default:
645 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
646 return -EINVAL;
647 }
648 }
649
650 return 0;
651 }
652
inet6_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)653 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
654 struct nlmsghdr *nlh,
655 struct netlink_ext_ack *extack)
656 {
657 struct net *net = sock_net(in_skb->sk);
658 struct nlattr *tb[NETCONFA_MAX+1];
659 struct inet6_dev *in6_dev = NULL;
660 struct net_device *dev = NULL;
661 struct sk_buff *skb;
662 struct ipv6_devconf *devconf;
663 int ifindex;
664 int err;
665
666 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
667 if (err < 0)
668 return err;
669
670 if (!tb[NETCONFA_IFINDEX])
671 return -EINVAL;
672
673 err = -EINVAL;
674 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
675 switch (ifindex) {
676 case NETCONFA_IFINDEX_ALL:
677 devconf = net->ipv6.devconf_all;
678 break;
679 case NETCONFA_IFINDEX_DEFAULT:
680 devconf = net->ipv6.devconf_dflt;
681 break;
682 default:
683 dev = dev_get_by_index(net, ifindex);
684 if (!dev)
685 return -EINVAL;
686 in6_dev = in6_dev_get(dev);
687 if (!in6_dev)
688 goto errout;
689 devconf = &in6_dev->cnf;
690 break;
691 }
692
693 err = -ENOBUFS;
694 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
695 if (!skb)
696 goto errout;
697
698 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
699 NETLINK_CB(in_skb).portid,
700 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
701 NETCONFA_ALL);
702 if (err < 0) {
703 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
704 WARN_ON(err == -EMSGSIZE);
705 kfree_skb(skb);
706 goto errout;
707 }
708 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
709 errout:
710 if (in6_dev)
711 in6_dev_put(in6_dev);
712 dev_put(dev);
713 return err;
714 }
715
716 /* Combine dev_addr_genid and dev_base_seq to detect changes.
717 */
inet6_base_seq(const struct net * net)718 static u32 inet6_base_seq(const struct net *net)
719 {
720 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
721 READ_ONCE(net->dev_base_seq);
722
723 /* Must not return 0 (see nl_dump_check_consistent()).
724 * Chose a value far away from 0.
725 */
726 if (!res)
727 res = 0x80000000;
728 return res;
729 }
730
inet6_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)731 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
732 struct netlink_callback *cb)
733 {
734 const struct nlmsghdr *nlh = cb->nlh;
735 struct net *net = sock_net(skb->sk);
736 struct {
737 unsigned long ifindex;
738 unsigned int all_default;
739 } *ctx = (void *)cb->ctx;
740 struct net_device *dev;
741 struct inet6_dev *idev;
742 int err = 0;
743
744 if (cb->strict_check) {
745 struct netlink_ext_ack *extack = cb->extack;
746 struct netconfmsg *ncm;
747
748 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
749 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
750 return -EINVAL;
751 }
752
753 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
754 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
755 return -EINVAL;
756 }
757 }
758
759 rcu_read_lock();
760 for_each_netdev_dump(net, dev, ctx->ifindex) {
761 idev = __in6_dev_get(dev);
762 if (!idev)
763 continue;
764 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
765 &idev->cnf,
766 NETLINK_CB(cb->skb).portid,
767 nlh->nlmsg_seq,
768 RTM_NEWNETCONF,
769 NLM_F_MULTI,
770 NETCONFA_ALL);
771 if (err < 0)
772 goto done;
773 }
774 if (ctx->all_default == 0) {
775 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
776 net->ipv6.devconf_all,
777 NETLINK_CB(cb->skb).portid,
778 nlh->nlmsg_seq,
779 RTM_NEWNETCONF, NLM_F_MULTI,
780 NETCONFA_ALL);
781 if (err < 0)
782 goto done;
783 ctx->all_default++;
784 }
785 if (ctx->all_default == 1) {
786 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
787 net->ipv6.devconf_dflt,
788 NETLINK_CB(cb->skb).portid,
789 nlh->nlmsg_seq,
790 RTM_NEWNETCONF, NLM_F_MULTI,
791 NETCONFA_ALL);
792 if (err < 0)
793 goto done;
794 ctx->all_default++;
795 }
796 done:
797 rcu_read_unlock();
798 return err;
799 }
800
801 #ifdef CONFIG_SYSCTL
dev_forward_change(struct inet6_dev * idev)802 static void dev_forward_change(struct inet6_dev *idev)
803 {
804 struct net_device *dev;
805 struct inet6_ifaddr *ifa;
806 LIST_HEAD(tmp_addr_list);
807
808 if (!idev)
809 return;
810 dev = idev->dev;
811 if (idev->cnf.forwarding)
812 dev_disable_lro(dev);
813 if (dev->flags & IFF_MULTICAST) {
814 if (idev->cnf.forwarding) {
815 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
816 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
817 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
818 } else {
819 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
820 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
821 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
822 }
823 }
824
825 read_lock_bh(&idev->lock);
826 list_for_each_entry(ifa, &idev->addr_list, if_list) {
827 if (ifa->flags&IFA_F_TENTATIVE)
828 continue;
829 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
830 }
831 read_unlock_bh(&idev->lock);
832
833 while (!list_empty(&tmp_addr_list)) {
834 ifa = list_first_entry(&tmp_addr_list,
835 struct inet6_ifaddr, if_list_aux);
836 list_del(&ifa->if_list_aux);
837 if (idev->cnf.forwarding)
838 addrconf_join_anycast(ifa);
839 else
840 addrconf_leave_anycast(ifa);
841 }
842
843 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
844 NETCONFA_FORWARDING,
845 dev->ifindex, &idev->cnf);
846 }
847
848
addrconf_forward_change(struct net * net,__s32 newf)849 static void addrconf_forward_change(struct net *net, __s32 newf)
850 {
851 struct net_device *dev;
852 struct inet6_dev *idev;
853
854 for_each_netdev(net, dev) {
855 idev = __in6_dev_get(dev);
856 if (idev) {
857 int changed = (!idev->cnf.forwarding) ^ (!newf);
858
859 WRITE_ONCE(idev->cnf.forwarding, newf);
860 if (changed)
861 dev_forward_change(idev);
862 }
863 }
864 }
865
addrconf_fixup_forwarding(const struct ctl_table * table,int * p,int newf)866 static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf)
867 {
868 struct net *net;
869 int old;
870
871 if (!rtnl_trylock())
872 return restart_syscall();
873
874 net = (struct net *)table->extra2;
875 old = *p;
876 WRITE_ONCE(*p, newf);
877
878 if (p == &net->ipv6.devconf_dflt->forwarding) {
879 if ((!newf) ^ (!old))
880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
881 NETCONFA_FORWARDING,
882 NETCONFA_IFINDEX_DEFAULT,
883 net->ipv6.devconf_dflt);
884 rtnl_unlock();
885 return 0;
886 }
887
888 if (p == &net->ipv6.devconf_all->forwarding) {
889 int old_dflt = net->ipv6.devconf_dflt->forwarding;
890
891 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
892 if ((!newf) ^ (!old_dflt))
893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
894 NETCONFA_FORWARDING,
895 NETCONFA_IFINDEX_DEFAULT,
896 net->ipv6.devconf_dflt);
897
898 addrconf_forward_change(net, newf);
899 if ((!newf) ^ (!old))
900 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
901 NETCONFA_FORWARDING,
902 NETCONFA_IFINDEX_ALL,
903 net->ipv6.devconf_all);
904 } else if ((!newf) ^ (!old))
905 dev_forward_change((struct inet6_dev *)table->extra1);
906 rtnl_unlock();
907
908 if (newf)
909 rt6_purge_dflt_routers(net);
910 return 1;
911 }
912
addrconf_linkdown_change(struct net * net,__s32 newf)913 static void addrconf_linkdown_change(struct net *net, __s32 newf)
914 {
915 struct net_device *dev;
916 struct inet6_dev *idev;
917
918 for_each_netdev(net, dev) {
919 idev = __in6_dev_get(dev);
920 if (idev) {
921 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
922
923 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
924 if (changed)
925 inet6_netconf_notify_devconf(dev_net(dev),
926 RTM_NEWNETCONF,
927 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
928 dev->ifindex,
929 &idev->cnf);
930 }
931 }
932 }
933
addrconf_fixup_linkdown(const struct ctl_table * table,int * p,int newf)934 static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf)
935 {
936 struct net *net;
937 int old;
938
939 if (!rtnl_trylock())
940 return restart_syscall();
941
942 net = (struct net *)table->extra2;
943 old = *p;
944 WRITE_ONCE(*p, newf);
945
946 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
947 if ((!newf) ^ (!old))
948 inet6_netconf_notify_devconf(net,
949 RTM_NEWNETCONF,
950 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
951 NETCONFA_IFINDEX_DEFAULT,
952 net->ipv6.devconf_dflt);
953 rtnl_unlock();
954 return 0;
955 }
956
957 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
958 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
959 addrconf_linkdown_change(net, newf);
960 if ((!newf) ^ (!old))
961 inet6_netconf_notify_devconf(net,
962 RTM_NEWNETCONF,
963 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
964 NETCONFA_IFINDEX_ALL,
965 net->ipv6.devconf_all);
966 }
967 rtnl_unlock();
968
969 return 1;
970 }
971
972 #endif
973
974 /* Nobody refers to this ifaddr, destroy it */
inet6_ifa_finish_destroy(struct inet6_ifaddr * ifp)975 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
976 {
977 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
978
979 #ifdef NET_REFCNT_DEBUG
980 pr_debug("%s\n", __func__);
981 #endif
982
983 in6_dev_put(ifp->idev);
984
985 if (cancel_delayed_work(&ifp->dad_work))
986 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
987 ifp);
988
989 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
990 pr_warn("Freeing alive inet6 address %p\n", ifp);
991 return;
992 }
993
994 kfree_rcu(ifp, rcu);
995 }
996
997 static void
ipv6_link_dev_addr(struct inet6_dev * idev,struct inet6_ifaddr * ifp)998 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
999 {
1000 struct list_head *p;
1001 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1002
1003 /*
1004 * Each device address list is sorted in order of scope -
1005 * global before linklocal.
1006 */
1007 list_for_each(p, &idev->addr_list) {
1008 struct inet6_ifaddr *ifa
1009 = list_entry(p, struct inet6_ifaddr, if_list);
1010 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1011 break;
1012 }
1013
1014 list_add_tail_rcu(&ifp->if_list, p);
1015 }
1016
inet6_addr_hash(const struct net * net,const struct in6_addr * addr)1017 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1018 {
1019 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1020
1021 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1022 }
1023
ipv6_chk_same_addr(struct net * net,const struct in6_addr * addr,struct net_device * dev,unsigned int hash)1024 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1025 struct net_device *dev, unsigned int hash)
1026 {
1027 struct inet6_ifaddr *ifp;
1028
1029 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1030 if (ipv6_addr_equal(&ifp->addr, addr)) {
1031 if (!dev || ifp->idev->dev == dev)
1032 return true;
1033 }
1034 }
1035 return false;
1036 }
1037
ipv6_add_addr_hash(struct net_device * dev,struct inet6_ifaddr * ifa)1038 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1039 {
1040 struct net *net = dev_net(dev);
1041 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1042 int err = 0;
1043
1044 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1045
1046 /* Ignore adding duplicate addresses on an interface */
1047 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1048 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1049 err = -EEXIST;
1050 } else {
1051 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1052 }
1053
1054 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1055
1056 return err;
1057 }
1058
1059 /* On success it returns ifp with increased reference count */
1060
1061 static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev * idev,struct ifa6_config * cfg,bool can_block,struct netlink_ext_ack * extack)1062 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1063 bool can_block, struct netlink_ext_ack *extack)
1064 {
1065 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1066 int addr_type = ipv6_addr_type(cfg->pfx);
1067 struct net *net = dev_net(idev->dev);
1068 struct inet6_ifaddr *ifa = NULL;
1069 struct fib6_info *f6i = NULL;
1070 int err = 0;
1071
1072 if (addr_type == IPV6_ADDR_ANY) {
1073 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1074 return ERR_PTR(-EADDRNOTAVAIL);
1075 } else if (addr_type & IPV6_ADDR_MULTICAST &&
1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1077 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1078 return ERR_PTR(-EADDRNOTAVAIL);
1079 } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1080 !netif_is_l3_master(idev->dev) &&
1081 addr_type & IPV6_ADDR_LOOPBACK) {
1082 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1083 return ERR_PTR(-EADDRNOTAVAIL);
1084 }
1085
1086 if (idev->dead) {
1087 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1088 err = -ENODEV;
1089 goto out;
1090 }
1091
1092 if (idev->cnf.disable_ipv6) {
1093 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1094 err = -EACCES;
1095 goto out;
1096 }
1097
1098 /* validator notifier needs to be blocking;
1099 * do not call in atomic context
1100 */
1101 if (can_block) {
1102 struct in6_validator_info i6vi = {
1103 .i6vi_addr = *cfg->pfx,
1104 .i6vi_dev = idev,
1105 .extack = extack,
1106 };
1107
1108 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1109 err = notifier_to_errno(err);
1110 if (err < 0)
1111 goto out;
1112 }
1113
1114 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1115 if (!ifa) {
1116 err = -ENOBUFS;
1117 goto out;
1118 }
1119
1120 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1121 if (IS_ERR(f6i)) {
1122 err = PTR_ERR(f6i);
1123 f6i = NULL;
1124 goto out;
1125 }
1126
1127 neigh_parms_data_state_setall(idev->nd_parms);
1128
1129 ifa->addr = *cfg->pfx;
1130 if (cfg->peer_pfx)
1131 ifa->peer_addr = *cfg->peer_pfx;
1132
1133 spin_lock_init(&ifa->lock);
1134 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1135 INIT_HLIST_NODE(&ifa->addr_lst);
1136 ifa->scope = cfg->scope;
1137 ifa->prefix_len = cfg->plen;
1138 ifa->rt_priority = cfg->rt_priority;
1139 ifa->flags = cfg->ifa_flags;
1140 ifa->ifa_proto = cfg->ifa_proto;
1141 /* No need to add the TENTATIVE flag for addresses with NODAD */
1142 if (!(cfg->ifa_flags & IFA_F_NODAD))
1143 ifa->flags |= IFA_F_TENTATIVE;
1144 ifa->valid_lft = cfg->valid_lft;
1145 ifa->prefered_lft = cfg->preferred_lft;
1146 ifa->cstamp = ifa->tstamp = jiffies;
1147 ifa->tokenized = false;
1148
1149 ifa->rt = f6i;
1150
1151 ifa->idev = idev;
1152 in6_dev_hold(idev);
1153
1154 /* For caller */
1155 refcount_set(&ifa->refcnt, 1);
1156
1157 rcu_read_lock();
1158
1159 err = ipv6_add_addr_hash(idev->dev, ifa);
1160 if (err < 0) {
1161 rcu_read_unlock();
1162 goto out;
1163 }
1164
1165 write_lock_bh(&idev->lock);
1166
1167 /* Add to inet6_dev unicast addr list. */
1168 ipv6_link_dev_addr(idev, ifa);
1169
1170 if (ifa->flags&IFA_F_TEMPORARY) {
1171 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1172 in6_ifa_hold(ifa);
1173 }
1174
1175 in6_ifa_hold(ifa);
1176 write_unlock_bh(&idev->lock);
1177
1178 rcu_read_unlock();
1179
1180 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1181 out:
1182 if (unlikely(err < 0)) {
1183 fib6_info_release(f6i);
1184
1185 if (ifa) {
1186 if (ifa->idev)
1187 in6_dev_put(ifa->idev);
1188 kfree(ifa);
1189 }
1190 ifa = ERR_PTR(err);
1191 }
1192
1193 return ifa;
1194 }
1195
1196 enum cleanup_prefix_rt_t {
1197 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1198 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1199 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1200 };
1201
1202 /*
1203 * Check, whether the prefix for ifp would still need a prefix route
1204 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1205 * constants.
1206 *
1207 * 1) we don't purge prefix if address was not permanent.
1208 * prefix is managed by its own lifetime.
1209 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1210 * 3) if there are no addresses, delete prefix.
1211 * 4) if there are still other permanent address(es),
1212 * corresponding prefix is still permanent.
1213 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1214 * don't purge the prefix, assume user space is managing it.
1215 * 6) otherwise, update prefix lifetime to the
1216 * longest valid lifetime among the corresponding
1217 * addresses on the device.
1218 * Note: subsequent RA will update lifetime.
1219 **/
1220 static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long * expires)1221 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1222 {
1223 struct inet6_ifaddr *ifa;
1224 struct inet6_dev *idev = ifp->idev;
1225 unsigned long lifetime;
1226 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1227
1228 *expires = jiffies;
1229
1230 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1231 if (ifa == ifp)
1232 continue;
1233 if (ifa->prefix_len != ifp->prefix_len ||
1234 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1235 ifp->prefix_len))
1236 continue;
1237 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1238 return CLEANUP_PREFIX_RT_NOP;
1239
1240 action = CLEANUP_PREFIX_RT_EXPIRE;
1241
1242 spin_lock(&ifa->lock);
1243
1244 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1245 /*
1246 * Note: Because this address is
1247 * not permanent, lifetime <
1248 * LONG_MAX / HZ here.
1249 */
1250 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1251 *expires = ifa->tstamp + lifetime * HZ;
1252 spin_unlock(&ifa->lock);
1253 }
1254
1255 return action;
1256 }
1257
1258 static void
cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,bool del_rt,bool del_peer)1259 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1260 bool del_rt, bool del_peer)
1261 {
1262 struct fib6_table *table;
1263 struct fib6_info *f6i;
1264
1265 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1266 ifp->prefix_len,
1267 ifp->idev->dev, 0, RTF_DEFAULT, true);
1268 if (f6i) {
1269 if (del_rt)
1270 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1271 else {
1272 if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1273 table = f6i->fib6_table;
1274 spin_lock_bh(&table->tb6_lock);
1275
1276 fib6_set_expires(f6i, expires);
1277 fib6_add_gc_list(f6i);
1278
1279 spin_unlock_bh(&table->tb6_lock);
1280 }
1281 fib6_info_release(f6i);
1282 }
1283 }
1284 }
1285
1286
1287 /* This function wants to get referenced ifp and releases it before return */
1288
ipv6_del_addr(struct inet6_ifaddr * ifp)1289 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1290 {
1291 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1292 struct net *net = dev_net(ifp->idev->dev);
1293 unsigned long expires;
1294 int state;
1295
1296 ASSERT_RTNL();
1297
1298 spin_lock_bh(&ifp->lock);
1299 state = ifp->state;
1300 ifp->state = INET6_IFADDR_STATE_DEAD;
1301 spin_unlock_bh(&ifp->lock);
1302
1303 if (state == INET6_IFADDR_STATE_DEAD)
1304 goto out;
1305
1306 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1307 hlist_del_init_rcu(&ifp->addr_lst);
1308 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1309
1310 write_lock_bh(&ifp->idev->lock);
1311
1312 if (ifp->flags&IFA_F_TEMPORARY) {
1313 list_del(&ifp->tmp_list);
1314 if (ifp->ifpub) {
1315 in6_ifa_put(ifp->ifpub);
1316 ifp->ifpub = NULL;
1317 }
1318 __in6_ifa_put(ifp);
1319 }
1320
1321 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1322 action = check_cleanup_prefix_route(ifp, &expires);
1323
1324 list_del_rcu(&ifp->if_list);
1325 __in6_ifa_put(ifp);
1326
1327 write_unlock_bh(&ifp->idev->lock);
1328
1329 addrconf_del_dad_work(ifp);
1330
1331 ipv6_ifa_notify(RTM_DELADDR, ifp);
1332
1333 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1334
1335 if (action != CLEANUP_PREFIX_RT_NOP) {
1336 cleanup_prefix_route(ifp, expires,
1337 action == CLEANUP_PREFIX_RT_DEL, false);
1338 }
1339
1340 /* clean up prefsrc entries */
1341 rt6_remove_prefsrc(ifp);
1342 out:
1343 in6_ifa_put(ifp);
1344 }
1345
ipv6_get_regen_advance(const struct inet6_dev * idev)1346 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1347 {
1348 return READ_ONCE(idev->cnf.regen_min_advance) +
1349 READ_ONCE(idev->cnf.regen_max_retry) *
1350 READ_ONCE(idev->cnf.dad_transmits) *
1351 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1352 }
1353
ipv6_create_tempaddr(struct inet6_ifaddr * ifp,bool block)1354 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1355 {
1356 struct inet6_dev *idev = ifp->idev;
1357 unsigned long tmp_tstamp, age;
1358 unsigned long regen_advance;
1359 unsigned long now = jiffies;
1360 u32 if_public_preferred_lft;
1361 s32 cnf_temp_preferred_lft;
1362 struct inet6_ifaddr *ift;
1363 struct ifa6_config cfg;
1364 long max_desync_factor;
1365 struct in6_addr addr;
1366 int ret = 0;
1367
1368 write_lock_bh(&idev->lock);
1369
1370 retry:
1371 in6_dev_hold(idev);
1372 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1373 write_unlock_bh(&idev->lock);
1374 pr_info("%s: use_tempaddr is disabled\n", __func__);
1375 in6_dev_put(idev);
1376 ret = -1;
1377 goto out;
1378 }
1379 spin_lock_bh(&ifp->lock);
1380 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1381 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1382 spin_unlock_bh(&ifp->lock);
1383 write_unlock_bh(&idev->lock);
1384 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1385 __func__);
1386 in6_dev_put(idev);
1387 ret = -1;
1388 goto out;
1389 }
1390 in6_ifa_hold(ifp);
1391 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1392 ipv6_gen_rnd_iid(&addr);
1393
1394 age = (now - ifp->tstamp) / HZ;
1395
1396 regen_advance = ipv6_get_regen_advance(idev);
1397
1398 /* recalculate max_desync_factor each time and update
1399 * idev->desync_factor if it's larger
1400 */
1401 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1402 max_desync_factor = min_t(long,
1403 READ_ONCE(idev->cnf.max_desync_factor),
1404 cnf_temp_preferred_lft - regen_advance);
1405
1406 if (unlikely(idev->desync_factor > max_desync_factor)) {
1407 if (max_desync_factor > 0) {
1408 get_random_bytes(&idev->desync_factor,
1409 sizeof(idev->desync_factor));
1410 idev->desync_factor %= max_desync_factor;
1411 } else {
1412 idev->desync_factor = 0;
1413 }
1414 }
1415
1416 if_public_preferred_lft = ifp->prefered_lft;
1417
1418 memset(&cfg, 0, sizeof(cfg));
1419 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1420 READ_ONCE(idev->cnf.temp_valid_lft) + age);
1421 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1422 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1423 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1424
1425 cfg.plen = ifp->prefix_len;
1426 tmp_tstamp = ifp->tstamp;
1427 spin_unlock_bh(&ifp->lock);
1428
1429 write_unlock_bh(&idev->lock);
1430
1431 /* From RFC 4941:
1432 *
1433 * A temporary address is created only if this calculated Preferred
1434 * Lifetime is greater than REGEN_ADVANCE time units. In
1435 * particular, an implementation must not create a temporary address
1436 * with a zero Preferred Lifetime.
1437 *
1438 * ...
1439 *
1440 * When creating a temporary address, the lifetime values MUST be
1441 * derived from the corresponding prefix as follows:
1442 *
1443 * ...
1444 *
1445 * * Its Preferred Lifetime is the lower of the Preferred Lifetime
1446 * of the public address or TEMP_PREFERRED_LIFETIME -
1447 * DESYNC_FACTOR.
1448 *
1449 * To comply with the RFC's requirements, clamp the preferred lifetime
1450 * to a minimum of regen_advance, unless that would exceed valid_lft or
1451 * ifp->prefered_lft.
1452 *
1453 * Use age calculation as in addrconf_verify to avoid unnecessary
1454 * temporary addresses being generated.
1455 */
1456 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1457 if (cfg.preferred_lft <= regen_advance + age) {
1458 cfg.preferred_lft = regen_advance + age + 1;
1459 if (cfg.preferred_lft > cfg.valid_lft ||
1460 cfg.preferred_lft > if_public_preferred_lft) {
1461 in6_ifa_put(ifp);
1462 in6_dev_put(idev);
1463 ret = -1;
1464 goto out;
1465 }
1466 }
1467
1468 cfg.ifa_flags = IFA_F_TEMPORARY;
1469 /* set in addrconf_prefix_rcv() */
1470 if (ifp->flags & IFA_F_OPTIMISTIC)
1471 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1472
1473 cfg.pfx = &addr;
1474 cfg.scope = ipv6_addr_scope(cfg.pfx);
1475
1476 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1477 if (IS_ERR(ift)) {
1478 in6_ifa_put(ifp);
1479 in6_dev_put(idev);
1480 pr_info("%s: retry temporary address regeneration\n", __func__);
1481 write_lock_bh(&idev->lock);
1482 goto retry;
1483 }
1484
1485 spin_lock_bh(&ift->lock);
1486 ift->ifpub = ifp;
1487 ift->cstamp = now;
1488 ift->tstamp = tmp_tstamp;
1489 spin_unlock_bh(&ift->lock);
1490
1491 addrconf_dad_start(ift);
1492 in6_ifa_put(ift);
1493 in6_dev_put(idev);
1494 out:
1495 return ret;
1496 }
1497
1498 /*
1499 * Choose an appropriate source address (RFC3484)
1500 */
1501 enum {
1502 IPV6_SADDR_RULE_INIT = 0,
1503 IPV6_SADDR_RULE_LOCAL,
1504 IPV6_SADDR_RULE_SCOPE,
1505 IPV6_SADDR_RULE_PREFERRED,
1506 #ifdef CONFIG_IPV6_MIP6
1507 IPV6_SADDR_RULE_HOA,
1508 #endif
1509 IPV6_SADDR_RULE_OIF,
1510 IPV6_SADDR_RULE_LABEL,
1511 IPV6_SADDR_RULE_PRIVACY,
1512 IPV6_SADDR_RULE_ORCHID,
1513 IPV6_SADDR_RULE_PREFIX,
1514 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1515 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1516 #endif
1517 IPV6_SADDR_RULE_MAX
1518 };
1519
1520 struct ipv6_saddr_score {
1521 int rule;
1522 int addr_type;
1523 struct inet6_ifaddr *ifa;
1524 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1525 int scopedist;
1526 int matchlen;
1527 };
1528
1529 struct ipv6_saddr_dst {
1530 const struct in6_addr *addr;
1531 int ifindex;
1532 int scope;
1533 int label;
1534 unsigned int prefs;
1535 };
1536
ipv6_saddr_preferred(int type)1537 static inline int ipv6_saddr_preferred(int type)
1538 {
1539 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1540 return 1;
1541 return 0;
1542 }
1543
ipv6_use_optimistic_addr(const struct net * net,const struct inet6_dev * idev)1544 static bool ipv6_use_optimistic_addr(const struct net *net,
1545 const struct inet6_dev *idev)
1546 {
1547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1548 if (!idev)
1549 return false;
1550 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1551 !READ_ONCE(idev->cnf.optimistic_dad))
1552 return false;
1553 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1554 !READ_ONCE(idev->cnf.use_optimistic))
1555 return false;
1556
1557 return true;
1558 #else
1559 return false;
1560 #endif
1561 }
1562
ipv6_allow_optimistic_dad(const struct net * net,const struct inet6_dev * idev)1563 static bool ipv6_allow_optimistic_dad(const struct net *net,
1564 const struct inet6_dev *idev)
1565 {
1566 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1567 if (!idev)
1568 return false;
1569 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1570 !READ_ONCE(idev->cnf.optimistic_dad))
1571 return false;
1572
1573 return true;
1574 #else
1575 return false;
1576 #endif
1577 }
1578
ipv6_get_saddr_eval(struct net * net,struct ipv6_saddr_score * score,struct ipv6_saddr_dst * dst,int i)1579 static int ipv6_get_saddr_eval(struct net *net,
1580 struct ipv6_saddr_score *score,
1581 struct ipv6_saddr_dst *dst,
1582 int i)
1583 {
1584 int ret;
1585
1586 if (i <= score->rule) {
1587 switch (i) {
1588 case IPV6_SADDR_RULE_SCOPE:
1589 ret = score->scopedist;
1590 break;
1591 case IPV6_SADDR_RULE_PREFIX:
1592 ret = score->matchlen;
1593 break;
1594 default:
1595 ret = !!test_bit(i, score->scorebits);
1596 }
1597 goto out;
1598 }
1599
1600 switch (i) {
1601 case IPV6_SADDR_RULE_INIT:
1602 /* Rule 0: remember if hiscore is not ready yet */
1603 ret = !!score->ifa;
1604 break;
1605 case IPV6_SADDR_RULE_LOCAL:
1606 /* Rule 1: Prefer same address */
1607 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1608 break;
1609 case IPV6_SADDR_RULE_SCOPE:
1610 /* Rule 2: Prefer appropriate scope
1611 *
1612 * ret
1613 * ^
1614 * -1 | d 15
1615 * ---+--+-+---> scope
1616 * |
1617 * | d is scope of the destination.
1618 * B-d | \
1619 * | \ <- smaller scope is better if
1620 * B-15 | \ if scope is enough for destination.
1621 * | ret = B - scope (-1 <= scope >= d <= 15).
1622 * d-C-1 | /
1623 * |/ <- greater is better
1624 * -C / if scope is not enough for destination.
1625 * /| ret = scope - C (-1 <= d < scope <= 15).
1626 *
1627 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1628 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1629 * Assume B = 0 and we get C > 29.
1630 */
1631 ret = __ipv6_addr_src_scope(score->addr_type);
1632 if (ret >= dst->scope)
1633 ret = -ret;
1634 else
1635 ret -= 128; /* 30 is enough */
1636 score->scopedist = ret;
1637 break;
1638 case IPV6_SADDR_RULE_PREFERRED:
1639 {
1640 /* Rule 3: Avoid deprecated and optimistic addresses */
1641 u8 avoid = IFA_F_DEPRECATED;
1642
1643 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1644 avoid |= IFA_F_OPTIMISTIC;
1645 ret = ipv6_saddr_preferred(score->addr_type) ||
1646 !(score->ifa->flags & avoid);
1647 break;
1648 }
1649 #ifdef CONFIG_IPV6_MIP6
1650 case IPV6_SADDR_RULE_HOA:
1651 {
1652 /* Rule 4: Prefer home address */
1653 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1654 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1655 break;
1656 }
1657 #endif
1658 case IPV6_SADDR_RULE_OIF:
1659 /* Rule 5: Prefer outgoing interface */
1660 ret = (!dst->ifindex ||
1661 dst->ifindex == score->ifa->idev->dev->ifindex);
1662 break;
1663 case IPV6_SADDR_RULE_LABEL:
1664 /* Rule 6: Prefer matching label */
1665 ret = ipv6_addr_label(net,
1666 &score->ifa->addr, score->addr_type,
1667 score->ifa->idev->dev->ifindex) == dst->label;
1668 break;
1669 case IPV6_SADDR_RULE_PRIVACY:
1670 {
1671 /* Rule 7: Prefer public address
1672 * Note: prefer temporary address if use_tempaddr >= 2
1673 */
1674 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1675 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1676 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1677 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1678 break;
1679 }
1680 case IPV6_SADDR_RULE_ORCHID:
1681 /* Rule 8-: Prefer ORCHID vs ORCHID or
1682 * non-ORCHID vs non-ORCHID
1683 */
1684 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1685 ipv6_addr_orchid(dst->addr));
1686 break;
1687 case IPV6_SADDR_RULE_PREFIX:
1688 /* Rule 8: Use longest matching prefix */
1689 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1690 if (ret > score->ifa->prefix_len)
1691 ret = score->ifa->prefix_len;
1692 score->matchlen = ret;
1693 break;
1694 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1695 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1696 /* Optimistic addresses still have lower precedence than other
1697 * preferred addresses.
1698 */
1699 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1700 break;
1701 #endif
1702 default:
1703 ret = 0;
1704 }
1705
1706 if (ret)
1707 __set_bit(i, score->scorebits);
1708 score->rule = i;
1709 out:
1710 return ret;
1711 }
1712
__ipv6_dev_get_saddr(struct net * net,struct ipv6_saddr_dst * dst,struct inet6_dev * idev,struct ipv6_saddr_score * scores,int hiscore_idx)1713 static int __ipv6_dev_get_saddr(struct net *net,
1714 struct ipv6_saddr_dst *dst,
1715 struct inet6_dev *idev,
1716 struct ipv6_saddr_score *scores,
1717 int hiscore_idx)
1718 {
1719 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1720
1721 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1722 int i;
1723
1724 /*
1725 * - Tentative Address (RFC2462 section 5.4)
1726 * - A tentative address is not considered
1727 * "assigned to an interface" in the traditional
1728 * sense, unless it is also flagged as optimistic.
1729 * - Candidate Source Address (section 4)
1730 * - In any case, anycast addresses, multicast
1731 * addresses, and the unspecified address MUST
1732 * NOT be included in a candidate set.
1733 */
1734 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1735 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1736 continue;
1737
1738 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1739
1740 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1741 score->addr_type & IPV6_ADDR_MULTICAST)) {
1742 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1743 idev->dev->name);
1744 continue;
1745 }
1746
1747 score->rule = -1;
1748 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1749
1750 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1751 int minihiscore, miniscore;
1752
1753 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1754 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1755
1756 if (minihiscore > miniscore) {
1757 if (i == IPV6_SADDR_RULE_SCOPE &&
1758 score->scopedist > 0) {
1759 /*
1760 * special case:
1761 * each remaining entry
1762 * has too small (not enough)
1763 * scope, because ifa entries
1764 * are sorted by their scope
1765 * values.
1766 */
1767 goto out;
1768 }
1769 break;
1770 } else if (minihiscore < miniscore) {
1771 swap(hiscore, score);
1772 hiscore_idx = 1 - hiscore_idx;
1773
1774 /* restore our iterator */
1775 score->ifa = hiscore->ifa;
1776
1777 break;
1778 }
1779 }
1780 }
1781 out:
1782 return hiscore_idx;
1783 }
1784
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)1785 static int ipv6_get_saddr_master(struct net *net,
1786 const struct net_device *dst_dev,
1787 const struct net_device *master,
1788 struct ipv6_saddr_dst *dst,
1789 struct ipv6_saddr_score *scores,
1790 int hiscore_idx)
1791 {
1792 struct inet6_dev *idev;
1793
1794 idev = __in6_dev_get(dst_dev);
1795 if (idev)
1796 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1797 scores, hiscore_idx);
1798
1799 idev = __in6_dev_get(master);
1800 if (idev)
1801 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1802 scores, hiscore_idx);
1803
1804 return hiscore_idx;
1805 }
1806
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)1807 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1808 const struct in6_addr *daddr, unsigned int prefs,
1809 struct in6_addr *saddr)
1810 {
1811 struct ipv6_saddr_score scores[2], *hiscore;
1812 struct ipv6_saddr_dst dst;
1813 struct inet6_dev *idev;
1814 struct net_device *dev;
1815 int dst_type;
1816 bool use_oif_addr = false;
1817 int hiscore_idx = 0;
1818 int ret = 0;
1819
1820 dst_type = __ipv6_addr_type(daddr);
1821 dst.addr = daddr;
1822 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1823 dst.scope = __ipv6_addr_src_scope(dst_type);
1824 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1825 dst.prefs = prefs;
1826
1827 scores[hiscore_idx].rule = -1;
1828 scores[hiscore_idx].ifa = NULL;
1829
1830 rcu_read_lock();
1831
1832 /* Candidate Source Address (section 4)
1833 * - multicast and link-local destination address,
1834 * the set of candidate source address MUST only
1835 * include addresses assigned to interfaces
1836 * belonging to the same link as the outgoing
1837 * interface.
1838 * (- For site-local destination addresses, the
1839 * set of candidate source addresses MUST only
1840 * include addresses assigned to interfaces
1841 * belonging to the same site as the outgoing
1842 * interface.)
1843 * - "It is RECOMMENDED that the candidate source addresses
1844 * be the set of unicast addresses assigned to the
1845 * interface that will be used to send to the destination
1846 * (the 'outgoing' interface)." (RFC 6724)
1847 */
1848 if (dst_dev) {
1849 idev = __in6_dev_get(dst_dev);
1850 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1851 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1852 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1853 use_oif_addr = true;
1854 }
1855 }
1856
1857 if (use_oif_addr) {
1858 if (idev)
1859 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1860 } else {
1861 const struct net_device *master;
1862 int master_idx = 0;
1863
1864 /* if dst_dev exists and is enslaved to an L3 device, then
1865 * prefer addresses from dst_dev and then the master over
1866 * any other enslaved devices in the L3 domain.
1867 */
1868 master = l3mdev_master_dev_rcu(dst_dev);
1869 if (master) {
1870 master_idx = master->ifindex;
1871
1872 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1873 master, &dst,
1874 scores, hiscore_idx);
1875
1876 if (scores[hiscore_idx].ifa &&
1877 scores[hiscore_idx].scopedist >= 0)
1878 goto out;
1879 }
1880
1881 for_each_netdev_rcu(net, dev) {
1882 /* only consider addresses on devices in the
1883 * same L3 domain
1884 */
1885 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1886 continue;
1887 idev = __in6_dev_get(dev);
1888 if (!idev)
1889 continue;
1890 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1891 }
1892 }
1893
1894 out:
1895 hiscore = &scores[hiscore_idx];
1896 if (!hiscore->ifa)
1897 ret = -EADDRNOTAVAIL;
1898 else
1899 *saddr = hiscore->ifa->addr;
1900
1901 rcu_read_unlock();
1902 return ret;
1903 }
1904 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1905
__ipv6_get_lladdr(struct inet6_dev * idev,struct in6_addr * addr,u32 banned_flags)1906 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1907 u32 banned_flags)
1908 {
1909 struct inet6_ifaddr *ifp;
1910 int err = -EADDRNOTAVAIL;
1911
1912 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1913 if (ifp->scope > IFA_LINK)
1914 break;
1915 if (ifp->scope == IFA_LINK &&
1916 !(ifp->flags & banned_flags)) {
1917 *addr = ifp->addr;
1918 err = 0;
1919 break;
1920 }
1921 }
1922 return err;
1923 }
1924
ipv6_get_lladdr(struct net_device * dev,struct in6_addr * addr,u32 banned_flags)1925 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1926 u32 banned_flags)
1927 {
1928 struct inet6_dev *idev;
1929 int err = -EADDRNOTAVAIL;
1930
1931 rcu_read_lock();
1932 idev = __in6_dev_get(dev);
1933 if (idev) {
1934 read_lock_bh(&idev->lock);
1935 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1936 read_unlock_bh(&idev->lock);
1937 }
1938 rcu_read_unlock();
1939 return err;
1940 }
1941
ipv6_count_addresses(const struct inet6_dev * idev)1942 static int ipv6_count_addresses(const struct inet6_dev *idev)
1943 {
1944 const struct inet6_ifaddr *ifp;
1945 int cnt = 0;
1946
1947 rcu_read_lock();
1948 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1949 cnt++;
1950 rcu_read_unlock();
1951 return cnt;
1952 }
1953
ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)1954 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1955 const struct net_device *dev, int strict)
1956 {
1957 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1958 strict, IFA_F_TENTATIVE);
1959 }
1960 EXPORT_SYMBOL(ipv6_chk_addr);
1961
1962 /* device argument is used to find the L3 domain of interest. If
1963 * skip_dev_check is set, then the ifp device is not checked against
1964 * the passed in dev argument. So the 2 cases for addresses checks are:
1965 * 1. does the address exist in the L3 domain that dev is part of
1966 * (skip_dev_check = true), or
1967 *
1968 * 2. does the address exist on the specific device
1969 * (skip_dev_check = false)
1970 */
1971 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)1972 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1973 const struct net_device *dev, bool skip_dev_check,
1974 int strict, u32 banned_flags)
1975 {
1976 unsigned int hash = inet6_addr_hash(net, addr);
1977 struct net_device *l3mdev, *ndev;
1978 struct inet6_ifaddr *ifp;
1979 u32 ifp_flags;
1980
1981 rcu_read_lock();
1982
1983 l3mdev = l3mdev_master_dev_rcu(dev);
1984 if (skip_dev_check)
1985 dev = NULL;
1986
1987 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1988 ndev = ifp->idev->dev;
1989
1990 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1991 continue;
1992
1993 /* Decouple optimistic from tentative for evaluation here.
1994 * Ban optimistic addresses explicitly, when required.
1995 */
1996 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1997 ? (ifp->flags&~IFA_F_TENTATIVE)
1998 : ifp->flags;
1999 if (ipv6_addr_equal(&ifp->addr, addr) &&
2000 !(ifp_flags&banned_flags) &&
2001 (!dev || ndev == dev ||
2002 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2003 rcu_read_unlock();
2004 return ndev;
2005 }
2006 }
2007
2008 rcu_read_unlock();
2009 return NULL;
2010 }
2011
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)2012 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2013 const struct net_device *dev, bool skip_dev_check,
2014 int strict, u32 banned_flags)
2015 {
2016 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2017 strict, banned_flags) ? 1 : 0;
2018 }
2019 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2020
2021
2022 /* Compares an address/prefix_len with addresses on device @dev.
2023 * If one is found it returns true.
2024 */
ipv6_chk_custom_prefix(const struct in6_addr * addr,const unsigned int prefix_len,struct net_device * dev)2025 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2026 const unsigned int prefix_len, struct net_device *dev)
2027 {
2028 const struct inet6_ifaddr *ifa;
2029 const struct inet6_dev *idev;
2030 bool ret = false;
2031
2032 rcu_read_lock();
2033 idev = __in6_dev_get(dev);
2034 if (idev) {
2035 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2036 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2037 if (ret)
2038 break;
2039 }
2040 }
2041 rcu_read_unlock();
2042
2043 return ret;
2044 }
2045 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2046
ipv6_chk_prefix(const struct in6_addr * addr,struct net_device * dev)2047 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2048 {
2049 const struct inet6_ifaddr *ifa;
2050 const struct inet6_dev *idev;
2051 int onlink;
2052
2053 onlink = 0;
2054 rcu_read_lock();
2055 idev = __in6_dev_get(dev);
2056 if (idev) {
2057 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2058 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2059 ifa->prefix_len);
2060 if (onlink)
2061 break;
2062 }
2063 }
2064 rcu_read_unlock();
2065 return onlink;
2066 }
2067 EXPORT_SYMBOL(ipv6_chk_prefix);
2068
2069 /**
2070 * ipv6_dev_find - find the first device with a given source address.
2071 * @net: the net namespace
2072 * @addr: the source address
2073 * @dev: used to find the L3 domain of interest
2074 *
2075 * The caller should be protected by RCU, or RTNL.
2076 */
ipv6_dev_find(struct net * net,const struct in6_addr * addr,struct net_device * dev)2077 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2078 struct net_device *dev)
2079 {
2080 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2081 IFA_F_TENTATIVE);
2082 }
2083 EXPORT_SYMBOL(ipv6_dev_find);
2084
ipv6_get_ifaddr(struct net * net,const struct in6_addr * addr,struct net_device * dev,int strict)2085 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2086 struct net_device *dev, int strict)
2087 {
2088 unsigned int hash = inet6_addr_hash(net, addr);
2089 struct inet6_ifaddr *ifp, *result = NULL;
2090
2091 rcu_read_lock();
2092 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2093 if (ipv6_addr_equal(&ifp->addr, addr)) {
2094 if (!dev || ifp->idev->dev == dev ||
2095 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2096 if (in6_ifa_hold_safe(ifp)) {
2097 result = ifp;
2098 break;
2099 }
2100 }
2101 }
2102 }
2103 rcu_read_unlock();
2104
2105 return result;
2106 }
2107
2108 /* Gets referenced address, destroys ifaddr */
2109
addrconf_dad_stop(struct inet6_ifaddr * ifp,int dad_failed)2110 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2111 {
2112 if (dad_failed)
2113 ifp->flags |= IFA_F_DADFAILED;
2114
2115 if (ifp->flags&IFA_F_TEMPORARY) {
2116 struct inet6_ifaddr *ifpub;
2117 spin_lock_bh(&ifp->lock);
2118 ifpub = ifp->ifpub;
2119 if (ifpub) {
2120 in6_ifa_hold(ifpub);
2121 spin_unlock_bh(&ifp->lock);
2122 ipv6_create_tempaddr(ifpub, true);
2123 in6_ifa_put(ifpub);
2124 } else {
2125 spin_unlock_bh(&ifp->lock);
2126 }
2127 ipv6_del_addr(ifp);
2128 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2129 spin_lock_bh(&ifp->lock);
2130 addrconf_del_dad_work(ifp);
2131 ifp->flags |= IFA_F_TENTATIVE;
2132 if (dad_failed)
2133 ifp->flags &= ~IFA_F_OPTIMISTIC;
2134 spin_unlock_bh(&ifp->lock);
2135 if (dad_failed)
2136 ipv6_ifa_notify(0, ifp);
2137 in6_ifa_put(ifp);
2138 } else {
2139 ipv6_del_addr(ifp);
2140 }
2141 }
2142
addrconf_dad_end(struct inet6_ifaddr * ifp)2143 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2144 {
2145 int err = -ENOENT;
2146
2147 spin_lock_bh(&ifp->lock);
2148 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2149 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2150 err = 0;
2151 }
2152 spin_unlock_bh(&ifp->lock);
2153
2154 return err;
2155 }
2156
addrconf_dad_failure(struct sk_buff * skb,struct inet6_ifaddr * ifp)2157 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2158 {
2159 struct inet6_dev *idev = ifp->idev;
2160 struct net *net = dev_net(idev->dev);
2161 int max_addresses;
2162
2163 if (addrconf_dad_end(ifp)) {
2164 in6_ifa_put(ifp);
2165 return;
2166 }
2167
2168 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2169 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2170
2171 spin_lock_bh(&ifp->lock);
2172
2173 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2174 struct in6_addr new_addr;
2175 struct inet6_ifaddr *ifp2;
2176 int retries = ifp->stable_privacy_retry + 1;
2177 struct ifa6_config cfg = {
2178 .pfx = &new_addr,
2179 .plen = ifp->prefix_len,
2180 .ifa_flags = ifp->flags,
2181 .valid_lft = ifp->valid_lft,
2182 .preferred_lft = ifp->prefered_lft,
2183 .scope = ifp->scope,
2184 };
2185
2186 if (retries > net->ipv6.sysctl.idgen_retries) {
2187 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2188 ifp->idev->dev->name);
2189 goto errdad;
2190 }
2191
2192 new_addr = ifp->addr;
2193 if (ipv6_generate_stable_address(&new_addr, retries,
2194 idev))
2195 goto errdad;
2196
2197 spin_unlock_bh(&ifp->lock);
2198
2199 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2200 if (max_addresses &&
2201 ipv6_count_addresses(idev) >= max_addresses)
2202 goto lock_errdad;
2203
2204 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2205 ifp->idev->dev->name);
2206
2207 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2208 if (IS_ERR(ifp2))
2209 goto lock_errdad;
2210
2211 spin_lock_bh(&ifp2->lock);
2212 ifp2->stable_privacy_retry = retries;
2213 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2214 spin_unlock_bh(&ifp2->lock);
2215
2216 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2217 in6_ifa_put(ifp2);
2218 lock_errdad:
2219 spin_lock_bh(&ifp->lock);
2220 }
2221
2222 errdad:
2223 /* transition from _POSTDAD to _ERRDAD */
2224 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2225 spin_unlock_bh(&ifp->lock);
2226
2227 addrconf_mod_dad_work(ifp, 0);
2228 in6_ifa_put(ifp);
2229 }
2230
2231 /* Join to solicited addr multicast group.
2232 * caller must hold RTNL */
addrconf_join_solict(struct net_device * dev,const struct in6_addr * addr)2233 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2234 {
2235 struct in6_addr maddr;
2236
2237 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2238 return;
2239
2240 addrconf_addr_solict_mult(addr, &maddr);
2241 ipv6_dev_mc_inc(dev, &maddr);
2242 }
2243
2244 /* caller must hold RTNL */
addrconf_leave_solict(struct inet6_dev * idev,const struct in6_addr * addr)2245 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2246 {
2247 struct in6_addr maddr;
2248
2249 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2250 return;
2251
2252 addrconf_addr_solict_mult(addr, &maddr);
2253 __ipv6_dev_mc_dec(idev, &maddr);
2254 }
2255
2256 /* caller must hold RTNL */
addrconf_join_anycast(struct inet6_ifaddr * ifp)2257 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2258 {
2259 struct in6_addr addr;
2260
2261 if (ifp->prefix_len >= 127) /* RFC 6164 */
2262 return;
2263 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2264 if (ipv6_addr_any(&addr))
2265 return;
2266 __ipv6_dev_ac_inc(ifp->idev, &addr);
2267 }
2268
2269 /* caller must hold RTNL */
addrconf_leave_anycast(struct inet6_ifaddr * ifp)2270 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2271 {
2272 struct in6_addr addr;
2273
2274 if (ifp->prefix_len >= 127) /* RFC 6164 */
2275 return;
2276 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2277 if (ipv6_addr_any(&addr))
2278 return;
2279 __ipv6_dev_ac_dec(ifp->idev, &addr);
2280 }
2281
addrconf_ifid_6lowpan(u8 * eui,struct net_device * dev)2282 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2283 {
2284 switch (dev->addr_len) {
2285 case ETH_ALEN:
2286 memcpy(eui, dev->dev_addr, 3);
2287 eui[3] = 0xFF;
2288 eui[4] = 0xFE;
2289 memcpy(eui + 5, dev->dev_addr + 3, 3);
2290 break;
2291 case EUI64_ADDR_LEN:
2292 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2293 eui[0] ^= 2;
2294 break;
2295 default:
2296 return -1;
2297 }
2298
2299 return 0;
2300 }
2301
addrconf_ifid_ieee1394(u8 * eui,struct net_device * dev)2302 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2303 {
2304 const union fwnet_hwaddr *ha;
2305
2306 if (dev->addr_len != FWNET_ALEN)
2307 return -1;
2308
2309 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2310
2311 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2312 eui[0] ^= 2;
2313 return 0;
2314 }
2315
addrconf_ifid_arcnet(u8 * eui,struct net_device * dev)2316 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2317 {
2318 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2319 if (dev->addr_len != ARCNET_ALEN)
2320 return -1;
2321 memset(eui, 0, 7);
2322 eui[7] = *(u8 *)dev->dev_addr;
2323 return 0;
2324 }
2325
addrconf_ifid_infiniband(u8 * eui,struct net_device * dev)2326 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2327 {
2328 if (dev->addr_len != INFINIBAND_ALEN)
2329 return -1;
2330 memcpy(eui, dev->dev_addr + 12, 8);
2331 eui[0] |= 2;
2332 return 0;
2333 }
2334
__ipv6_isatap_ifid(u8 * eui,__be32 addr)2335 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2336 {
2337 if (addr == 0)
2338 return -1;
2339 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2340 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2341 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2342 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2343 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2344 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2345 eui[1] = 0;
2346 eui[2] = 0x5E;
2347 eui[3] = 0xFE;
2348 memcpy(eui + 4, &addr, 4);
2349 return 0;
2350 }
2351
addrconf_ifid_sit(u8 * eui,struct net_device * dev)2352 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2353 {
2354 if (dev->priv_flags & IFF_ISATAP)
2355 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2356 return -1;
2357 }
2358
addrconf_ifid_gre(u8 * eui,struct net_device * dev)2359 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2360 {
2361 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2362 }
2363
addrconf_ifid_ip6tnl(u8 * eui,struct net_device * dev)2364 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2365 {
2366 memcpy(eui, dev->perm_addr, 3);
2367 memcpy(eui + 5, dev->perm_addr + 3, 3);
2368 eui[3] = 0xFF;
2369 eui[4] = 0xFE;
2370 eui[0] ^= 2;
2371 return 0;
2372 }
2373
ipv6_generate_eui64(u8 * eui,struct net_device * dev)2374 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2375 {
2376 switch (dev->type) {
2377 case ARPHRD_ETHER:
2378 case ARPHRD_FDDI:
2379 return addrconf_ifid_eui48(eui, dev);
2380 case ARPHRD_ARCNET:
2381 return addrconf_ifid_arcnet(eui, dev);
2382 case ARPHRD_INFINIBAND:
2383 return addrconf_ifid_infiniband(eui, dev);
2384 case ARPHRD_SIT:
2385 return addrconf_ifid_sit(eui, dev);
2386 case ARPHRD_IPGRE:
2387 case ARPHRD_TUNNEL:
2388 return addrconf_ifid_gre(eui, dev);
2389 case ARPHRD_6LOWPAN:
2390 return addrconf_ifid_6lowpan(eui, dev);
2391 case ARPHRD_IEEE1394:
2392 return addrconf_ifid_ieee1394(eui, dev);
2393 case ARPHRD_TUNNEL6:
2394 case ARPHRD_IP6GRE:
2395 case ARPHRD_RAWIP:
2396 return addrconf_ifid_ip6tnl(eui, dev);
2397 }
2398 return -1;
2399 }
2400
ipv6_inherit_eui64(u8 * eui,struct inet6_dev * idev)2401 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2402 {
2403 int err = -1;
2404 struct inet6_ifaddr *ifp;
2405
2406 read_lock_bh(&idev->lock);
2407 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2408 if (ifp->scope > IFA_LINK)
2409 break;
2410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2411 memcpy(eui, ifp->addr.s6_addr+8, 8);
2412 err = 0;
2413 break;
2414 }
2415 }
2416 read_unlock_bh(&idev->lock);
2417 return err;
2418 }
2419
2420 /* Generation of a randomized Interface Identifier
2421 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2422 */
2423
ipv6_gen_rnd_iid(struct in6_addr * addr)2424 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2425 {
2426 regen:
2427 get_random_bytes(&addr->s6_addr[8], 8);
2428
2429 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2430 * check if generated address is not inappropriate:
2431 *
2432 * - Reserved IPv6 Interface Identifiers
2433 * - XXX: already assigned to an address on the device
2434 */
2435
2436 /* Subnet-router anycast: 0000:0000:0000:0000 */
2437 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2438 goto regen;
2439
2440 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2441 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2442 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2443 */
2444 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2445 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2446 goto regen;
2447
2448 /* Reserved subnet anycast addresses */
2449 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2450 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2451 goto regen;
2452 }
2453
2454 /*
2455 * Add prefix route.
2456 */
2457
2458 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)2459 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2460 struct net_device *dev, unsigned long expires,
2461 u32 flags, gfp_t gfp_flags)
2462 {
2463 struct fib6_config cfg = {
2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2465 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2466 .fc_ifindex = dev->ifindex,
2467 .fc_expires = expires,
2468 .fc_dst_len = plen,
2469 .fc_flags = RTF_UP | flags,
2470 .fc_nlinfo.nl_net = dev_net(dev),
2471 .fc_protocol = RTPROT_KERNEL,
2472 .fc_type = RTN_UNICAST,
2473 };
2474
2475 cfg.fc_dst = *pfx;
2476
2477 /* Prevent useless cloning on PtP SIT.
2478 This thing is done here expecting that the whole
2479 class of non-broadcast devices need not cloning.
2480 */
2481 #if IS_ENABLED(CONFIG_IPV6_SIT)
2482 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2483 cfg.fc_flags |= RTF_NONEXTHOP;
2484 #endif
2485
2486 ip6_route_add(&cfg, gfp_flags, NULL);
2487 }
2488
2489
addrconf_get_prefix_route(const struct in6_addr * pfx,int plen,const struct net_device * dev,u32 flags,u32 noflags,bool no_gw)2490 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2491 int plen,
2492 const struct net_device *dev,
2493 u32 flags, u32 noflags,
2494 bool no_gw)
2495 {
2496 struct fib6_node *fn;
2497 struct fib6_info *rt = NULL;
2498 struct fib6_table *table;
2499 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2500
2501 table = fib6_get_table(dev_net(dev), tb_id);
2502 if (!table)
2503 return NULL;
2504
2505 rcu_read_lock();
2506 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2507 if (!fn)
2508 goto out;
2509
2510 for_each_fib6_node_rt_rcu(fn) {
2511 /* prefix routes only use builtin fib6_nh */
2512 if (rt->nh)
2513 continue;
2514
2515 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2516 continue;
2517 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2518 continue;
2519 if ((rt->fib6_flags & flags) != flags)
2520 continue;
2521 if ((rt->fib6_flags & noflags) != 0)
2522 continue;
2523 if (!fib6_info_hold_safe(rt))
2524 continue;
2525 break;
2526 }
2527 out:
2528 rcu_read_unlock();
2529 return rt;
2530 }
2531
2532
2533 /* Create "default" multicast route to the interface */
2534
addrconf_add_mroute(struct net_device * dev)2535 static void addrconf_add_mroute(struct net_device *dev)
2536 {
2537 struct fib6_config cfg = {
2538 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2539 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2540 .fc_ifindex = dev->ifindex,
2541 .fc_dst_len = 8,
2542 .fc_flags = RTF_UP,
2543 .fc_type = RTN_MULTICAST,
2544 .fc_nlinfo.nl_net = dev_net(dev),
2545 .fc_protocol = RTPROT_KERNEL,
2546 };
2547
2548 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2549
2550 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2551 }
2552
addrconf_add_dev(struct net_device * dev)2553 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2554 {
2555 struct inet6_dev *idev;
2556
2557 ASSERT_RTNL();
2558
2559 idev = ipv6_find_idev(dev);
2560 if (IS_ERR(idev))
2561 return idev;
2562
2563 if (idev->cnf.disable_ipv6)
2564 return ERR_PTR(-EACCES);
2565
2566 /* Add default multicast route */
2567 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2568 addrconf_add_mroute(dev);
2569
2570 return idev;
2571 }
2572
manage_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp,__u32 valid_lft,__u32 prefered_lft,bool create,unsigned long now)2573 static void manage_tempaddrs(struct inet6_dev *idev,
2574 struct inet6_ifaddr *ifp,
2575 __u32 valid_lft, __u32 prefered_lft,
2576 bool create, unsigned long now)
2577 {
2578 u32 flags;
2579 struct inet6_ifaddr *ift;
2580
2581 read_lock_bh(&idev->lock);
2582 /* update all temporary addresses in the list */
2583 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2584 int age, max_valid, max_prefered;
2585
2586 if (ifp != ift->ifpub)
2587 continue;
2588
2589 /* RFC 4941 section 3.3:
2590 * If a received option will extend the lifetime of a public
2591 * address, the lifetimes of temporary addresses should
2592 * be extended, subject to the overall constraint that no
2593 * temporary addresses should ever remain "valid" or "preferred"
2594 * for a time longer than (TEMP_VALID_LIFETIME) or
2595 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2596 */
2597 age = (now - ift->cstamp) / HZ;
2598 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2599 if (max_valid < 0)
2600 max_valid = 0;
2601
2602 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2603 idev->desync_factor - age;
2604 if (max_prefered < 0)
2605 max_prefered = 0;
2606
2607 if (valid_lft > max_valid)
2608 valid_lft = max_valid;
2609
2610 if (prefered_lft > max_prefered)
2611 prefered_lft = max_prefered;
2612
2613 spin_lock(&ift->lock);
2614 flags = ift->flags;
2615 ift->valid_lft = valid_lft;
2616 ift->prefered_lft = prefered_lft;
2617 ift->tstamp = now;
2618 if (prefered_lft > 0)
2619 ift->flags &= ~IFA_F_DEPRECATED;
2620
2621 spin_unlock(&ift->lock);
2622 if (!(flags&IFA_F_TENTATIVE))
2623 ipv6_ifa_notify(0, ift);
2624 }
2625
2626 /* Also create a temporary address if it's enabled but no temporary
2627 * address currently exists.
2628 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2629 * as part of cleanup (ie. deleting the mngtmpaddr).
2630 * We don't want that to result in creating a new temporary ip address.
2631 */
2632 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2633 create = true;
2634
2635 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2636 /* When a new public address is created as described
2637 * in [ADDRCONF], also create a new temporary address.
2638 */
2639 read_unlock_bh(&idev->lock);
2640 ipv6_create_tempaddr(ifp, false);
2641 } else {
2642 read_unlock_bh(&idev->lock);
2643 }
2644 }
2645
is_addr_mode_generate_stable(struct inet6_dev * idev)2646 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2647 {
2648 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2649 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2650 }
2651
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)2652 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2653 const struct prefix_info *pinfo,
2654 struct inet6_dev *in6_dev,
2655 const struct in6_addr *addr, int addr_type,
2656 u32 addr_flags, bool sllao, bool tokenized,
2657 __u32 valid_lft, u32 prefered_lft)
2658 {
2659 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2660 int create = 0, update_lft = 0;
2661
2662 if (!ifp && valid_lft) {
2663 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2664 struct ifa6_config cfg = {
2665 .pfx = addr,
2666 .plen = pinfo->prefix_len,
2667 .ifa_flags = addr_flags,
2668 .valid_lft = valid_lft,
2669 .preferred_lft = prefered_lft,
2670 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2671 .ifa_proto = IFAPROT_KERNEL_RA
2672 };
2673
2674 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2675 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2676 READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2677 !net->ipv6.devconf_all->forwarding && sllao)
2678 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2679 #endif
2680
2681 /* Do not allow to create too much of autoconfigured
2682 * addresses; this would be too easy way to crash kernel.
2683 */
2684 if (!max_addresses ||
2685 ipv6_count_addresses(in6_dev) < max_addresses)
2686 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2687
2688 if (IS_ERR_OR_NULL(ifp))
2689 return -1;
2690
2691 create = 1;
2692 spin_lock_bh(&ifp->lock);
2693 ifp->flags |= IFA_F_MANAGETEMPADDR;
2694 ifp->cstamp = jiffies;
2695 ifp->tokenized = tokenized;
2696 spin_unlock_bh(&ifp->lock);
2697 addrconf_dad_start(ifp);
2698 }
2699
2700 if (ifp) {
2701 u32 flags;
2702 unsigned long now;
2703 u32 stored_lft;
2704
2705 /* update lifetime (RFC2462 5.5.3 e) */
2706 spin_lock_bh(&ifp->lock);
2707 now = jiffies;
2708 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2709 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2710 else
2711 stored_lft = 0;
2712
2713 /* RFC4862 Section 5.5.3e:
2714 * "Note that the preferred lifetime of the
2715 * corresponding address is always reset to
2716 * the Preferred Lifetime in the received
2717 * Prefix Information option, regardless of
2718 * whether the valid lifetime is also reset or
2719 * ignored."
2720 *
2721 * So we should always update prefered_lft here.
2722 */
2723 update_lft = !create && stored_lft;
2724
2725 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2726 const u32 minimum_lft = min_t(u32,
2727 stored_lft, MIN_VALID_LIFETIME);
2728 valid_lft = max(valid_lft, minimum_lft);
2729 }
2730
2731 if (update_lft) {
2732 ifp->valid_lft = valid_lft;
2733 ifp->prefered_lft = prefered_lft;
2734 WRITE_ONCE(ifp->tstamp, now);
2735 flags = ifp->flags;
2736 ifp->flags &= ~IFA_F_DEPRECATED;
2737 spin_unlock_bh(&ifp->lock);
2738
2739 if (!(flags&IFA_F_TENTATIVE))
2740 ipv6_ifa_notify(0, ifp);
2741 } else
2742 spin_unlock_bh(&ifp->lock);
2743
2744 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2745 create, now);
2746
2747 in6_ifa_put(ifp);
2748 addrconf_verify(net);
2749 }
2750
2751 return 0;
2752 }
2753 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2754
addrconf_prefix_rcv(struct net_device * dev,u8 * opt,int len,bool sllao)2755 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2756 {
2757 struct prefix_info *pinfo;
2758 struct fib6_table *table;
2759 __u32 valid_lft;
2760 __u32 prefered_lft;
2761 int addr_type, err;
2762 u32 addr_flags = 0;
2763 struct inet6_dev *in6_dev;
2764 struct net *net = dev_net(dev);
2765 bool ignore_autoconf = false;
2766
2767 pinfo = (struct prefix_info *) opt;
2768
2769 if (len < sizeof(struct prefix_info)) {
2770 netdev_dbg(dev, "addrconf: prefix option too short\n");
2771 return;
2772 }
2773
2774 /*
2775 * Validation checks ([ADDRCONF], page 19)
2776 */
2777
2778 addr_type = ipv6_addr_type(&pinfo->prefix);
2779
2780 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2781 return;
2782
2783 valid_lft = ntohl(pinfo->valid);
2784 prefered_lft = ntohl(pinfo->prefered);
2785
2786 if (prefered_lft > valid_lft) {
2787 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2788 return;
2789 }
2790
2791 in6_dev = in6_dev_get(dev);
2792
2793 if (!in6_dev) {
2794 net_dbg_ratelimited("addrconf: device %s not configured\n",
2795 dev->name);
2796 return;
2797 }
2798
2799 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2800 goto put;
2801
2802 /*
2803 * Two things going on here:
2804 * 1) Add routes for on-link prefixes
2805 * 2) Configure prefixes with the auto flag set
2806 */
2807
2808 if (pinfo->onlink) {
2809 struct fib6_info *rt;
2810 unsigned long rt_expires;
2811
2812 /* Avoid arithmetic overflow. Really, we could
2813 * save rt_expires in seconds, likely valid_lft,
2814 * but it would require division in fib gc, that it
2815 * not good.
2816 */
2817 if (HZ > USER_HZ)
2818 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2819 else
2820 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2821
2822 if (addrconf_finite_timeout(rt_expires))
2823 rt_expires *= HZ;
2824
2825 rt = addrconf_get_prefix_route(&pinfo->prefix,
2826 pinfo->prefix_len,
2827 dev,
2828 RTF_ADDRCONF | RTF_PREFIX_RT,
2829 RTF_DEFAULT, true);
2830
2831 if (rt) {
2832 /* Autoconf prefix route */
2833 if (valid_lft == 0) {
2834 ip6_del_rt(net, rt, false);
2835 rt = NULL;
2836 } else {
2837 table = rt->fib6_table;
2838 spin_lock_bh(&table->tb6_lock);
2839
2840 if (addrconf_finite_timeout(rt_expires)) {
2841 /* not infinity */
2842 fib6_set_expires(rt, jiffies + rt_expires);
2843 fib6_add_gc_list(rt);
2844 } else {
2845 fib6_clean_expires(rt);
2846 fib6_remove_gc_list(rt);
2847 }
2848
2849 spin_unlock_bh(&table->tb6_lock);
2850 }
2851 } else if (valid_lft) {
2852 clock_t expires = 0;
2853 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2854 if (addrconf_finite_timeout(rt_expires)) {
2855 /* not infinity */
2856 flags |= RTF_EXPIRES;
2857 expires = jiffies_to_clock_t(rt_expires);
2858 }
2859 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2860 0, dev, expires, flags,
2861 GFP_ATOMIC);
2862 }
2863 fib6_info_release(rt);
2864 }
2865
2866 /* Try to figure out our local address for this prefix */
2867
2868 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd;
2869 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) {
2870 struct in6_addr addr;
2871 bool tokenized = false, dev_addr_generated = false;
2872
2873 if (pinfo->prefix_len == 64) {
2874 memcpy(&addr, &pinfo->prefix, 8);
2875
2876 if (!ipv6_addr_any(&in6_dev->token)) {
2877 read_lock_bh(&in6_dev->lock);
2878 memcpy(addr.s6_addr + 8,
2879 in6_dev->token.s6_addr + 8, 8);
2880 read_unlock_bh(&in6_dev->lock);
2881 tokenized = true;
2882 } else if (is_addr_mode_generate_stable(in6_dev) &&
2883 !ipv6_generate_stable_address(&addr, 0,
2884 in6_dev)) {
2885 addr_flags |= IFA_F_STABLE_PRIVACY;
2886 goto ok;
2887 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2888 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2889 goto put;
2890 } else {
2891 dev_addr_generated = true;
2892 }
2893 goto ok;
2894 }
2895 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2896 pinfo->prefix_len);
2897 goto put;
2898
2899 ok:
2900 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2901 &addr, addr_type,
2902 addr_flags, sllao,
2903 tokenized, valid_lft,
2904 prefered_lft);
2905 if (err)
2906 goto put;
2907
2908 /* Ignore error case here because previous prefix add addr was
2909 * successful which will be notified.
2910 */
2911 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2912 addr_type, addr_flags, sllao,
2913 tokenized, valid_lft,
2914 prefered_lft,
2915 dev_addr_generated);
2916 }
2917 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2918 put:
2919 in6_dev_put(in6_dev);
2920 }
2921
addrconf_set_sit_dstaddr(struct net * net,struct net_device * dev,struct in6_ifreq * ireq)2922 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2923 struct in6_ifreq *ireq)
2924 {
2925 struct ip_tunnel_parm_kern p = { };
2926 int err;
2927
2928 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2929 return -EADDRNOTAVAIL;
2930
2931 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2932 p.iph.version = 4;
2933 p.iph.ihl = 5;
2934 p.iph.protocol = IPPROTO_IPV6;
2935 p.iph.ttl = 64;
2936
2937 if (!dev->netdev_ops->ndo_tunnel_ctl)
2938 return -EOPNOTSUPP;
2939 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2940 if (err)
2941 return err;
2942
2943 dev = __dev_get_by_name(net, p.name);
2944 if (!dev)
2945 return -ENOBUFS;
2946 return dev_open(dev, NULL);
2947 }
2948
2949 /*
2950 * Set destination address.
2951 * Special case for SIT interfaces where we create a new "virtual"
2952 * device.
2953 */
addrconf_set_dstaddr(struct net * net,void __user * arg)2954 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2955 {
2956 struct net_device *dev;
2957 struct in6_ifreq ireq;
2958 int err = -ENODEV;
2959
2960 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2961 return -ENODEV;
2962 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2963 return -EFAULT;
2964
2965 rtnl_lock();
2966 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2967 if (dev && dev->type == ARPHRD_SIT)
2968 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2969 rtnl_unlock();
2970 return err;
2971 }
2972
ipv6_mc_config(struct sock * sk,bool join,const struct in6_addr * addr,int ifindex)2973 static int ipv6_mc_config(struct sock *sk, bool join,
2974 const struct in6_addr *addr, int ifindex)
2975 {
2976 int ret;
2977
2978 ASSERT_RTNL();
2979
2980 lock_sock(sk);
2981 if (join)
2982 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2983 else
2984 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2985 release_sock(sk);
2986
2987 return ret;
2988 }
2989
2990 /*
2991 * Manual configuration of address on an interface
2992 */
inet6_addr_add(struct net * net,int ifindex,struct ifa6_config * cfg,struct netlink_ext_ack * extack)2993 static int inet6_addr_add(struct net *net, int ifindex,
2994 struct ifa6_config *cfg,
2995 struct netlink_ext_ack *extack)
2996 {
2997 struct inet6_ifaddr *ifp;
2998 struct inet6_dev *idev;
2999 struct net_device *dev;
3000 unsigned long timeout;
3001 clock_t expires;
3002 u32 flags;
3003
3004 ASSERT_RTNL();
3005
3006 if (cfg->plen > 128) {
3007 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3008 return -EINVAL;
3009 }
3010
3011 /* check the lifetime */
3012 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3013 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3014 return -EINVAL;
3015 }
3016
3017 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3018 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3019 return -EINVAL;
3020 }
3021
3022 dev = __dev_get_by_index(net, ifindex);
3023 if (!dev)
3024 return -ENODEV;
3025
3026 idev = addrconf_add_dev(dev);
3027 if (IS_ERR(idev)) {
3028 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3029 return PTR_ERR(idev);
3030 }
3031
3032 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3033 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3034 true, cfg->pfx, ifindex);
3035
3036 if (ret < 0) {
3037 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3038 return ret;
3039 }
3040 }
3041
3042 cfg->scope = ipv6_addr_scope(cfg->pfx);
3043
3044 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3045 if (addrconf_finite_timeout(timeout)) {
3046 expires = jiffies_to_clock_t(timeout * HZ);
3047 cfg->valid_lft = timeout;
3048 flags = RTF_EXPIRES;
3049 } else {
3050 expires = 0;
3051 flags = 0;
3052 cfg->ifa_flags |= IFA_F_PERMANENT;
3053 }
3054
3055 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3056 if (addrconf_finite_timeout(timeout)) {
3057 if (timeout == 0)
3058 cfg->ifa_flags |= IFA_F_DEPRECATED;
3059 cfg->preferred_lft = timeout;
3060 }
3061
3062 ifp = ipv6_add_addr(idev, cfg, true, extack);
3063 if (!IS_ERR(ifp)) {
3064 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3065 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3066 ifp->rt_priority, dev, expires,
3067 flags, GFP_KERNEL);
3068 }
3069
3070 /* Send a netlink notification if DAD is enabled and
3071 * optimistic flag is not set
3072 */
3073 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3074 ipv6_ifa_notify(0, ifp);
3075 /*
3076 * Note that section 3.1 of RFC 4429 indicates
3077 * that the Optimistic flag should not be set for
3078 * manually configured addresses
3079 */
3080 addrconf_dad_start(ifp);
3081 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3082 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3083 cfg->preferred_lft, true, jiffies);
3084 in6_ifa_put(ifp);
3085 addrconf_verify_rtnl(net);
3086 return 0;
3087 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3088 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3089 cfg->pfx, ifindex);
3090 }
3091
3092 return PTR_ERR(ifp);
3093 }
3094
inet6_addr_del(struct net * net,int ifindex,u32 ifa_flags,const struct in6_addr * pfx,unsigned int plen,struct netlink_ext_ack * extack)3095 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3096 const struct in6_addr *pfx, unsigned int plen,
3097 struct netlink_ext_ack *extack)
3098 {
3099 struct inet6_ifaddr *ifp;
3100 struct inet6_dev *idev;
3101 struct net_device *dev;
3102
3103 if (plen > 128) {
3104 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3105 return -EINVAL;
3106 }
3107
3108 dev = __dev_get_by_index(net, ifindex);
3109 if (!dev) {
3110 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3111 return -ENODEV;
3112 }
3113
3114 idev = __in6_dev_get(dev);
3115 if (!idev) {
3116 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3117 return -ENXIO;
3118 }
3119
3120 read_lock_bh(&idev->lock);
3121 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3122 if (ifp->prefix_len == plen &&
3123 ipv6_addr_equal(pfx, &ifp->addr)) {
3124 in6_ifa_hold(ifp);
3125 read_unlock_bh(&idev->lock);
3126
3127 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3128 (ifa_flags & IFA_F_MANAGETEMPADDR))
3129 manage_tempaddrs(idev, ifp, 0, 0, false,
3130 jiffies);
3131 ipv6_del_addr(ifp);
3132 addrconf_verify_rtnl(net);
3133 if (ipv6_addr_is_multicast(pfx)) {
3134 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3135 false, pfx, dev->ifindex);
3136 }
3137 return 0;
3138 }
3139 }
3140 read_unlock_bh(&idev->lock);
3141
3142 NL_SET_ERR_MSG_MOD(extack, "address not found");
3143 return -EADDRNOTAVAIL;
3144 }
3145
3146
addrconf_add_ifaddr(struct net * net,void __user * arg)3147 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3148 {
3149 struct ifa6_config cfg = {
3150 .ifa_flags = IFA_F_PERMANENT,
3151 .preferred_lft = INFINITY_LIFE_TIME,
3152 .valid_lft = INFINITY_LIFE_TIME,
3153 };
3154 struct in6_ifreq ireq;
3155 int err;
3156
3157 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3158 return -EPERM;
3159
3160 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3161 return -EFAULT;
3162
3163 cfg.pfx = &ireq.ifr6_addr;
3164 cfg.plen = ireq.ifr6_prefixlen;
3165
3166 rtnl_lock();
3167 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3168 rtnl_unlock();
3169 return err;
3170 }
3171
addrconf_del_ifaddr(struct net * net,void __user * arg)3172 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3173 {
3174 struct in6_ifreq ireq;
3175 int err;
3176
3177 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3178 return -EPERM;
3179
3180 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3181 return -EFAULT;
3182
3183 rtnl_lock();
3184 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3185 ireq.ifr6_prefixlen, NULL);
3186 rtnl_unlock();
3187 return err;
3188 }
3189
add_addr(struct inet6_dev * idev,const struct in6_addr * addr,int plen,int scope,u8 proto)3190 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3191 int plen, int scope, u8 proto)
3192 {
3193 struct inet6_ifaddr *ifp;
3194 struct ifa6_config cfg = {
3195 .pfx = addr,
3196 .plen = plen,
3197 .ifa_flags = IFA_F_PERMANENT,
3198 .valid_lft = INFINITY_LIFE_TIME,
3199 .preferred_lft = INFINITY_LIFE_TIME,
3200 .scope = scope,
3201 .ifa_proto = proto
3202 };
3203
3204 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3205 if (!IS_ERR(ifp)) {
3206 spin_lock_bh(&ifp->lock);
3207 ifp->flags &= ~IFA_F_TENTATIVE;
3208 spin_unlock_bh(&ifp->lock);
3209 rt_genid_bump_ipv6(dev_net(idev->dev));
3210 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3211 in6_ifa_put(ifp);
3212 }
3213 }
3214
3215 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
add_v4_addrs(struct inet6_dev * idev)3216 static void add_v4_addrs(struct inet6_dev *idev)
3217 {
3218 struct in6_addr addr;
3219 struct net_device *dev;
3220 struct net *net = dev_net(idev->dev);
3221 int scope, plen, offset = 0;
3222 u32 pflags = 0;
3223
3224 ASSERT_RTNL();
3225
3226 memset(&addr, 0, sizeof(struct in6_addr));
3227 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3228 if (idev->dev->addr_len == sizeof(struct in6_addr))
3229 offset = sizeof(struct in6_addr) - 4;
3230 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3231
3232 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3233 scope = IPV6_ADDR_COMPATv4;
3234 plen = 96;
3235 pflags |= RTF_NONEXTHOP;
3236 } else {
3237 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3238 return;
3239
3240 addr.s6_addr32[0] = htonl(0xfe800000);
3241 scope = IFA_LINK;
3242 plen = 64;
3243 }
3244
3245 if (addr.s6_addr32[3]) {
3246 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3247 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3248 GFP_KERNEL);
3249 return;
3250 }
3251
3252 for_each_netdev(net, dev) {
3253 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3254 if (in_dev && (dev->flags & IFF_UP)) {
3255 struct in_ifaddr *ifa;
3256 int flag = scope;
3257
3258 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3259 addr.s6_addr32[3] = ifa->ifa_local;
3260
3261 if (ifa->ifa_scope == RT_SCOPE_LINK)
3262 continue;
3263 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3264 if (idev->dev->flags&IFF_POINTOPOINT)
3265 continue;
3266 flag |= IFA_HOST;
3267 }
3268
3269 add_addr(idev, &addr, plen, flag,
3270 IFAPROT_UNSPEC);
3271 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3272 0, pflags, GFP_KERNEL);
3273 }
3274 }
3275 }
3276 }
3277 #endif
3278
init_loopback(struct net_device * dev)3279 static void init_loopback(struct net_device *dev)
3280 {
3281 struct inet6_dev *idev;
3282
3283 /* ::1 */
3284
3285 ASSERT_RTNL();
3286
3287 idev = ipv6_find_idev(dev);
3288 if (IS_ERR(idev)) {
3289 pr_debug("%s: add_dev failed\n", __func__);
3290 return;
3291 }
3292
3293 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3294 }
3295
addrconf_add_linklocal(struct inet6_dev * idev,const struct in6_addr * addr,u32 flags)3296 void addrconf_add_linklocal(struct inet6_dev *idev,
3297 const struct in6_addr *addr, u32 flags)
3298 {
3299 struct ifa6_config cfg = {
3300 .pfx = addr,
3301 .plen = 64,
3302 .ifa_flags = flags | IFA_F_PERMANENT,
3303 .valid_lft = INFINITY_LIFE_TIME,
3304 .preferred_lft = INFINITY_LIFE_TIME,
3305 .scope = IFA_LINK,
3306 .ifa_proto = IFAPROT_KERNEL_LL
3307 };
3308 struct inet6_ifaddr *ifp;
3309
3310 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3311 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3312 READ_ONCE(idev->cnf.optimistic_dad)) &&
3313 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3314 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3315 #endif
3316
3317 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3318 if (!IS_ERR(ifp)) {
3319 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3320 0, 0, GFP_ATOMIC);
3321 addrconf_dad_start(ifp);
3322 in6_ifa_put(ifp);
3323 }
3324 }
3325 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3326
ipv6_reserved_interfaceid(struct in6_addr address)3327 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3328 {
3329 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3330 return true;
3331
3332 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3333 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3334 return true;
3335
3336 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3337 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3338 return true;
3339
3340 return false;
3341 }
3342
ipv6_generate_stable_address(struct in6_addr * address,u8 dad_count,const struct inet6_dev * idev)3343 static int ipv6_generate_stable_address(struct in6_addr *address,
3344 u8 dad_count,
3345 const struct inet6_dev *idev)
3346 {
3347 static DEFINE_SPINLOCK(lock);
3348 static __u32 digest[SHA1_DIGEST_WORDS];
3349 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3350
3351 static union {
3352 char __data[SHA1_BLOCK_SIZE];
3353 struct {
3354 struct in6_addr secret;
3355 __be32 prefix[2];
3356 unsigned char hwaddr[MAX_ADDR_LEN];
3357 u8 dad_count;
3358 } __packed;
3359 } data;
3360
3361 struct in6_addr secret;
3362 struct in6_addr temp;
3363 struct net *net = dev_net(idev->dev);
3364
3365 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3366
3367 if (idev->cnf.stable_secret.initialized)
3368 secret = idev->cnf.stable_secret.secret;
3369 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3370 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3371 else
3372 return -1;
3373
3374 retry:
3375 spin_lock_bh(&lock);
3376
3377 sha1_init(digest);
3378 memset(&data, 0, sizeof(data));
3379 memset(workspace, 0, sizeof(workspace));
3380 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3381 data.prefix[0] = address->s6_addr32[0];
3382 data.prefix[1] = address->s6_addr32[1];
3383 data.secret = secret;
3384 data.dad_count = dad_count;
3385
3386 sha1_transform(digest, data.__data, workspace);
3387
3388 temp = *address;
3389 temp.s6_addr32[2] = (__force __be32)digest[0];
3390 temp.s6_addr32[3] = (__force __be32)digest[1];
3391
3392 spin_unlock_bh(&lock);
3393
3394 if (ipv6_reserved_interfaceid(temp)) {
3395 dad_count++;
3396 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3397 return -1;
3398 goto retry;
3399 }
3400
3401 *address = temp;
3402 return 0;
3403 }
3404
ipv6_gen_mode_random_init(struct inet6_dev * idev)3405 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3406 {
3407 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3408
3409 if (s->initialized)
3410 return;
3411 s = &idev->cnf.stable_secret;
3412 get_random_bytes(&s->secret, sizeof(s->secret));
3413 s->initialized = true;
3414 }
3415
addrconf_addr_gen(struct inet6_dev * idev,bool prefix_route)3416 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3417 {
3418 struct in6_addr addr;
3419
3420 /* no link local addresses on L3 master devices */
3421 if (netif_is_l3_master(idev->dev))
3422 return;
3423
3424 /* no link local addresses on devices flagged as slaves */
3425 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3426 return;
3427
3428 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3429
3430 switch (idev->cnf.addr_gen_mode) {
3431 case IN6_ADDR_GEN_MODE_RANDOM:
3432 ipv6_gen_mode_random_init(idev);
3433 fallthrough;
3434 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3435 if (!ipv6_generate_stable_address(&addr, 0, idev))
3436 addrconf_add_linklocal(idev, &addr,
3437 IFA_F_STABLE_PRIVACY);
3438 else if (prefix_route)
3439 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3440 0, 0, GFP_KERNEL);
3441 break;
3442 case IN6_ADDR_GEN_MODE_EUI64:
3443 /* addrconf_add_linklocal also adds a prefix_route and we
3444 * only need to care about prefix routes if ipv6_generate_eui64
3445 * couldn't generate one.
3446 */
3447 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3448 addrconf_add_linklocal(idev, &addr, 0);
3449 else if (prefix_route)
3450 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3451 0, 0, GFP_KERNEL);
3452 break;
3453 case IN6_ADDR_GEN_MODE_NONE:
3454 default:
3455 /* will not add any link local address */
3456 break;
3457 }
3458 }
3459
addrconf_dev_config(struct net_device * dev)3460 static void addrconf_dev_config(struct net_device *dev)
3461 {
3462 struct inet6_dev *idev;
3463
3464 ASSERT_RTNL();
3465
3466 if ((dev->type != ARPHRD_ETHER) &&
3467 (dev->type != ARPHRD_FDDI) &&
3468 (dev->type != ARPHRD_ARCNET) &&
3469 (dev->type != ARPHRD_INFINIBAND) &&
3470 (dev->type != ARPHRD_IEEE1394) &&
3471 (dev->type != ARPHRD_TUNNEL6) &&
3472 (dev->type != ARPHRD_6LOWPAN) &&
3473 (dev->type != ARPHRD_TUNNEL) &&
3474 (dev->type != ARPHRD_NONE) &&
3475 (dev->type != ARPHRD_RAWIP)) {
3476 /* Alas, we support only Ethernet autoconfiguration. */
3477 idev = __in6_dev_get(dev);
3478 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3479 dev->flags & IFF_MULTICAST)
3480 ipv6_mc_up(idev);
3481 return;
3482 }
3483
3484 idev = addrconf_add_dev(dev);
3485 if (IS_ERR(idev))
3486 return;
3487
3488 /* this device type has no EUI support */
3489 if (dev->type == ARPHRD_NONE &&
3490 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3491 WRITE_ONCE(idev->cnf.addr_gen_mode,
3492 IN6_ADDR_GEN_MODE_RANDOM);
3493
3494 addrconf_addr_gen(idev, false);
3495 }
3496
3497 #if IS_ENABLED(CONFIG_IPV6_SIT)
addrconf_sit_config(struct net_device * dev)3498 static void addrconf_sit_config(struct net_device *dev)
3499 {
3500 struct inet6_dev *idev;
3501
3502 ASSERT_RTNL();
3503
3504 /*
3505 * Configure the tunnel with one of our IPv4
3506 * addresses... we should configure all of
3507 * our v4 addrs in the tunnel
3508 */
3509
3510 idev = ipv6_find_idev(dev);
3511 if (IS_ERR(idev)) {
3512 pr_debug("%s: add_dev failed\n", __func__);
3513 return;
3514 }
3515
3516 if (dev->priv_flags & IFF_ISATAP) {
3517 addrconf_addr_gen(idev, false);
3518 return;
3519 }
3520
3521 add_v4_addrs(idev);
3522
3523 if (dev->flags&IFF_POINTOPOINT)
3524 addrconf_add_mroute(dev);
3525 }
3526 #endif
3527
3528 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
addrconf_gre_config(struct net_device * dev)3529 static void addrconf_gre_config(struct net_device *dev)
3530 {
3531 struct inet6_dev *idev;
3532
3533 ASSERT_RTNL();
3534
3535 idev = ipv6_find_idev(dev);
3536 if (IS_ERR(idev)) {
3537 pr_debug("%s: add_dev failed\n", __func__);
3538 return;
3539 }
3540
3541 if (dev->type == ARPHRD_ETHER) {
3542 addrconf_addr_gen(idev, true);
3543 return;
3544 }
3545
3546 add_v4_addrs(idev);
3547
3548 if (dev->flags & IFF_POINTOPOINT)
3549 addrconf_add_mroute(dev);
3550 }
3551 #endif
3552
addrconf_init_auto_addrs(struct net_device * dev)3553 static void addrconf_init_auto_addrs(struct net_device *dev)
3554 {
3555 switch (dev->type) {
3556 #if IS_ENABLED(CONFIG_IPV6_SIT)
3557 case ARPHRD_SIT:
3558 addrconf_sit_config(dev);
3559 break;
3560 #endif
3561 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3562 case ARPHRD_IP6GRE:
3563 case ARPHRD_IPGRE:
3564 addrconf_gre_config(dev);
3565 break;
3566 #endif
3567 case ARPHRD_LOOPBACK:
3568 init_loopback(dev);
3569 break;
3570
3571 default:
3572 addrconf_dev_config(dev);
3573 break;
3574 }
3575 }
3576
fixup_permanent_addr(struct net * net,struct inet6_dev * idev,struct inet6_ifaddr * ifp)3577 static int fixup_permanent_addr(struct net *net,
3578 struct inet6_dev *idev,
3579 struct inet6_ifaddr *ifp)
3580 {
3581 /* !fib6_node means the host route was removed from the
3582 * FIB, for example, if 'lo' device is taken down. In that
3583 * case regenerate the host route.
3584 */
3585 if (!ifp->rt || !ifp->rt->fib6_node) {
3586 struct fib6_info *f6i, *prev;
3587
3588 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3589 GFP_ATOMIC, NULL);
3590 if (IS_ERR(f6i))
3591 return PTR_ERR(f6i);
3592
3593 /* ifp->rt can be accessed outside of rtnl */
3594 spin_lock(&ifp->lock);
3595 prev = ifp->rt;
3596 ifp->rt = f6i;
3597 spin_unlock(&ifp->lock);
3598
3599 fib6_info_release(prev);
3600 }
3601
3602 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3603 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3604 ifp->rt_priority, idev->dev, 0, 0,
3605 GFP_ATOMIC);
3606 }
3607
3608 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3609 addrconf_dad_start(ifp);
3610
3611 return 0;
3612 }
3613
addrconf_permanent_addr(struct net * net,struct net_device * dev)3614 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3615 {
3616 struct inet6_ifaddr *ifp, *tmp;
3617 struct inet6_dev *idev;
3618
3619 idev = __in6_dev_get(dev);
3620 if (!idev)
3621 return;
3622
3623 write_lock_bh(&idev->lock);
3624
3625 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3626 if ((ifp->flags & IFA_F_PERMANENT) &&
3627 fixup_permanent_addr(net, idev, ifp) < 0) {
3628 write_unlock_bh(&idev->lock);
3629 in6_ifa_hold(ifp);
3630 ipv6_del_addr(ifp);
3631 write_lock_bh(&idev->lock);
3632
3633 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3634 idev->dev->name, &ifp->addr);
3635 }
3636 }
3637
3638 write_unlock_bh(&idev->lock);
3639 }
3640
addrconf_notify(struct notifier_block * this,unsigned long event,void * ptr)3641 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3642 void *ptr)
3643 {
3644 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3645 struct netdev_notifier_change_info *change_info;
3646 struct netdev_notifier_changeupper_info *info;
3647 struct inet6_dev *idev = __in6_dev_get(dev);
3648 struct net *net = dev_net(dev);
3649 int run_pending = 0;
3650 int err;
3651
3652 switch (event) {
3653 case NETDEV_REGISTER:
3654 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3655 idev = ipv6_add_dev(dev);
3656 if (IS_ERR(idev))
3657 return notifier_from_errno(PTR_ERR(idev));
3658 }
3659 break;
3660
3661 case NETDEV_CHANGEMTU:
3662 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3663 if (dev->mtu < IPV6_MIN_MTU) {
3664 addrconf_ifdown(dev, dev != net->loopback_dev);
3665 break;
3666 }
3667
3668 if (idev) {
3669 rt6_mtu_change(dev, dev->mtu);
3670 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3671 break;
3672 }
3673
3674 /* allocate new idev */
3675 idev = ipv6_add_dev(dev);
3676 if (IS_ERR(idev))
3677 break;
3678
3679 /* device is still not ready */
3680 if (!(idev->if_flags & IF_READY))
3681 break;
3682
3683 run_pending = 1;
3684 fallthrough;
3685 case NETDEV_UP:
3686 case NETDEV_CHANGE:
3687 if (idev && idev->cnf.disable_ipv6)
3688 break;
3689
3690 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3691 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3692 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3693 ipv6_mc_up(idev);
3694 break;
3695 }
3696
3697 if (event == NETDEV_UP) {
3698 /* restore routes for permanent addresses */
3699 addrconf_permanent_addr(net, dev);
3700
3701 if (!addrconf_link_ready(dev)) {
3702 /* device is not ready yet. */
3703 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3704 dev->name);
3705 break;
3706 }
3707
3708 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3709 idev = ipv6_add_dev(dev);
3710
3711 if (!IS_ERR_OR_NULL(idev)) {
3712 idev->if_flags |= IF_READY;
3713 run_pending = 1;
3714 }
3715 } else if (event == NETDEV_CHANGE) {
3716 if (!addrconf_link_ready(dev)) {
3717 /* device is still not ready. */
3718 rt6_sync_down_dev(dev, event);
3719 break;
3720 }
3721
3722 if (!IS_ERR_OR_NULL(idev)) {
3723 if (idev->if_flags & IF_READY) {
3724 /* device is already configured -
3725 * but resend MLD reports, we might
3726 * have roamed and need to update
3727 * multicast snooping switches
3728 */
3729 ipv6_mc_up(idev);
3730 change_info = ptr;
3731 if (change_info->flags_changed & IFF_NOARP)
3732 addrconf_dad_run(idev, true);
3733 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3734 break;
3735 }
3736 idev->if_flags |= IF_READY;
3737 }
3738
3739 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3740 dev->name);
3741
3742 run_pending = 1;
3743 }
3744
3745 addrconf_init_auto_addrs(dev);
3746
3747 if (!IS_ERR_OR_NULL(idev)) {
3748 if (run_pending)
3749 addrconf_dad_run(idev, false);
3750
3751 /* Device has an address by now */
3752 rt6_sync_up(dev, RTNH_F_DEAD);
3753
3754 /*
3755 * If the MTU changed during the interface down,
3756 * when the interface up, the changed MTU must be
3757 * reflected in the idev as well as routers.
3758 */
3759 if (idev->cnf.mtu6 != dev->mtu &&
3760 dev->mtu >= IPV6_MIN_MTU) {
3761 rt6_mtu_change(dev, dev->mtu);
3762 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3763 }
3764 WRITE_ONCE(idev->tstamp, jiffies);
3765 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3766
3767 /*
3768 * If the changed mtu during down is lower than
3769 * IPV6_MIN_MTU stop IPv6 on this interface.
3770 */
3771 if (dev->mtu < IPV6_MIN_MTU)
3772 addrconf_ifdown(dev, dev != net->loopback_dev);
3773 }
3774 break;
3775
3776 case NETDEV_DOWN:
3777 case NETDEV_UNREGISTER:
3778 /*
3779 * Remove all addresses from this interface.
3780 */
3781 addrconf_ifdown(dev, event != NETDEV_DOWN);
3782 break;
3783
3784 case NETDEV_CHANGENAME:
3785 if (idev) {
3786 snmp6_unregister_dev(idev);
3787 addrconf_sysctl_unregister(idev);
3788 err = addrconf_sysctl_register(idev);
3789 if (err)
3790 return notifier_from_errno(err);
3791 err = snmp6_register_dev(idev);
3792 if (err) {
3793 addrconf_sysctl_unregister(idev);
3794 return notifier_from_errno(err);
3795 }
3796 }
3797 break;
3798
3799 case NETDEV_PRE_TYPE_CHANGE:
3800 case NETDEV_POST_TYPE_CHANGE:
3801 if (idev)
3802 addrconf_type_change(dev, event);
3803 break;
3804
3805 case NETDEV_CHANGEUPPER:
3806 info = ptr;
3807
3808 /* flush all routes if dev is linked to or unlinked from
3809 * an L3 master device (e.g., VRF)
3810 */
3811 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3812 addrconf_ifdown(dev, false);
3813 }
3814
3815 return NOTIFY_OK;
3816 }
3817
3818 /*
3819 * addrconf module should be notified of a device going up
3820 */
3821 static struct notifier_block ipv6_dev_notf = {
3822 .notifier_call = addrconf_notify,
3823 .priority = ADDRCONF_NOTIFY_PRIORITY,
3824 };
3825
addrconf_type_change(struct net_device * dev,unsigned long event)3826 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3827 {
3828 struct inet6_dev *idev;
3829 ASSERT_RTNL();
3830
3831 idev = __in6_dev_get(dev);
3832
3833 if (event == NETDEV_POST_TYPE_CHANGE)
3834 ipv6_mc_remap(idev);
3835 else if (event == NETDEV_PRE_TYPE_CHANGE)
3836 ipv6_mc_unmap(idev);
3837 }
3838
addr_is_local(const struct in6_addr * addr)3839 static bool addr_is_local(const struct in6_addr *addr)
3840 {
3841 return ipv6_addr_type(addr) &
3842 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3843 }
3844
addrconf_ifdown(struct net_device * dev,bool unregister)3845 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3846 {
3847 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3848 struct net *net = dev_net(dev);
3849 struct inet6_dev *idev;
3850 struct inet6_ifaddr *ifa;
3851 LIST_HEAD(tmp_addr_list);
3852 bool keep_addr = false;
3853 bool was_ready;
3854 int state, i;
3855
3856 ASSERT_RTNL();
3857
3858 rt6_disable_ip(dev, event);
3859
3860 idev = __in6_dev_get(dev);
3861 if (!idev)
3862 return -ENODEV;
3863
3864 /*
3865 * Step 1: remove reference to ipv6 device from parent device.
3866 * Do not dev_put!
3867 */
3868 if (unregister) {
3869 idev->dead = 1;
3870
3871 /* protected by rtnl_lock */
3872 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3873
3874 /* Step 1.5: remove snmp6 entry */
3875 snmp6_unregister_dev(idev);
3876
3877 }
3878
3879 /* combine the user config with event to determine if permanent
3880 * addresses are to be removed from address hash table
3881 */
3882 if (!unregister && !idev->cnf.disable_ipv6) {
3883 /* aggregate the system setting and interface setting */
3884 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3885
3886 if (!_keep_addr)
3887 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3888
3889 keep_addr = (_keep_addr > 0);
3890 }
3891
3892 /* Step 2: clear hash table */
3893 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3894 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3895
3896 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3897 restart:
3898 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3899 if (ifa->idev == idev) {
3900 addrconf_del_dad_work(ifa);
3901 /* combined flag + permanent flag decide if
3902 * address is retained on a down event
3903 */
3904 if (!keep_addr ||
3905 !(ifa->flags & IFA_F_PERMANENT) ||
3906 addr_is_local(&ifa->addr)) {
3907 hlist_del_init_rcu(&ifa->addr_lst);
3908 goto restart;
3909 }
3910 }
3911 }
3912 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3913 }
3914
3915 write_lock_bh(&idev->lock);
3916
3917 addrconf_del_rs_timer(idev);
3918
3919 /* Step 2: clear flags for stateless addrconf, repeated down
3920 * detection
3921 */
3922 was_ready = idev->if_flags & IF_READY;
3923 if (!unregister)
3924 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3925
3926 /* Step 3: clear tempaddr list */
3927 while (!list_empty(&idev->tempaddr_list)) {
3928 ifa = list_first_entry(&idev->tempaddr_list,
3929 struct inet6_ifaddr, tmp_list);
3930 list_del(&ifa->tmp_list);
3931 write_unlock_bh(&idev->lock);
3932 spin_lock_bh(&ifa->lock);
3933
3934 if (ifa->ifpub) {
3935 in6_ifa_put(ifa->ifpub);
3936 ifa->ifpub = NULL;
3937 }
3938 spin_unlock_bh(&ifa->lock);
3939 in6_ifa_put(ifa);
3940 write_lock_bh(&idev->lock);
3941 }
3942
3943 list_for_each_entry(ifa, &idev->addr_list, if_list)
3944 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3945 write_unlock_bh(&idev->lock);
3946
3947 while (!list_empty(&tmp_addr_list)) {
3948 struct fib6_info *rt = NULL;
3949 bool keep;
3950
3951 ifa = list_first_entry(&tmp_addr_list,
3952 struct inet6_ifaddr, if_list_aux);
3953 list_del(&ifa->if_list_aux);
3954
3955 addrconf_del_dad_work(ifa);
3956
3957 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3958 !addr_is_local(&ifa->addr);
3959
3960 spin_lock_bh(&ifa->lock);
3961
3962 if (keep) {
3963 /* set state to skip the notifier below */
3964 state = INET6_IFADDR_STATE_DEAD;
3965 ifa->state = INET6_IFADDR_STATE_PREDAD;
3966 if (!(ifa->flags & IFA_F_NODAD))
3967 ifa->flags |= IFA_F_TENTATIVE;
3968
3969 rt = ifa->rt;
3970 ifa->rt = NULL;
3971 } else {
3972 state = ifa->state;
3973 ifa->state = INET6_IFADDR_STATE_DEAD;
3974 }
3975
3976 spin_unlock_bh(&ifa->lock);
3977
3978 if (rt)
3979 ip6_del_rt(net, rt, false);
3980
3981 if (state != INET6_IFADDR_STATE_DEAD) {
3982 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3983 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3984 } else {
3985 if (idev->cnf.forwarding)
3986 addrconf_leave_anycast(ifa);
3987 addrconf_leave_solict(ifa->idev, &ifa->addr);
3988 }
3989
3990 if (!keep) {
3991 write_lock_bh(&idev->lock);
3992 list_del_rcu(&ifa->if_list);
3993 write_unlock_bh(&idev->lock);
3994 in6_ifa_put(ifa);
3995 }
3996 }
3997
3998 /* Step 5: Discard anycast and multicast list */
3999 if (unregister) {
4000 ipv6_ac_destroy_dev(idev);
4001 ipv6_mc_destroy_dev(idev);
4002 } else if (was_ready) {
4003 ipv6_mc_down(idev);
4004 }
4005
4006 WRITE_ONCE(idev->tstamp, jiffies);
4007 idev->ra_mtu = 0;
4008
4009 /* Last: Shot the device (if unregistered) */
4010 if (unregister) {
4011 addrconf_sysctl_unregister(idev);
4012 neigh_parms_release(&nd_tbl, idev->nd_parms);
4013 neigh_ifdown(&nd_tbl, dev);
4014 in6_dev_put(idev);
4015 }
4016 return 0;
4017 }
4018
addrconf_rs_timer(struct timer_list * t)4019 static void addrconf_rs_timer(struct timer_list *t)
4020 {
4021 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4022 struct net_device *dev = idev->dev;
4023 struct in6_addr lladdr;
4024 int rtr_solicits;
4025
4026 write_lock(&idev->lock);
4027 if (idev->dead || !(idev->if_flags & IF_READY))
4028 goto out;
4029
4030 if (!ipv6_accept_ra(idev))
4031 goto out;
4032
4033 /* Announcement received after solicitation was sent */
4034 if (idev->if_flags & IF_RA_RCVD)
4035 goto out;
4036
4037 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4038
4039 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4040 write_unlock(&idev->lock);
4041 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4042 ndisc_send_rs(dev, &lladdr,
4043 &in6addr_linklocal_allrouters);
4044 else
4045 goto put;
4046
4047 write_lock(&idev->lock);
4048 idev->rs_interval = rfc3315_s14_backoff_update(
4049 idev->rs_interval,
4050 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4051 /* The wait after the last probe can be shorter */
4052 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4053 READ_ONCE(idev->cnf.rtr_solicits)) ?
4054 READ_ONCE(idev->cnf.rtr_solicit_delay) :
4055 idev->rs_interval);
4056 } else {
4057 /*
4058 * Note: we do not support deprecated "all on-link"
4059 * assumption any longer.
4060 */
4061 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4062 }
4063
4064 out:
4065 write_unlock(&idev->lock);
4066 put:
4067 in6_dev_put(idev);
4068 }
4069
4070 /*
4071 * Duplicate Address Detection
4072 */
addrconf_dad_kick(struct inet6_ifaddr * ifp)4073 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4074 {
4075 struct inet6_dev *idev = ifp->idev;
4076 unsigned long rand_num;
4077 u64 nonce;
4078
4079 if (ifp->flags & IFA_F_OPTIMISTIC)
4080 rand_num = 0;
4081 else
4082 rand_num = get_random_u32_below(
4083 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4084
4085 nonce = 0;
4086 if (READ_ONCE(idev->cnf.enhanced_dad) ||
4087 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4088 do
4089 get_random_bytes(&nonce, 6);
4090 while (nonce == 0);
4091 }
4092 ifp->dad_nonce = nonce;
4093 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4094 addrconf_mod_dad_work(ifp, rand_num);
4095 }
4096
addrconf_dad_begin(struct inet6_ifaddr * ifp)4097 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4098 {
4099 struct inet6_dev *idev = ifp->idev;
4100 struct net_device *dev = idev->dev;
4101 bool bump_id, notify = false;
4102 struct net *net;
4103
4104 addrconf_join_solict(dev, &ifp->addr);
4105
4106 read_lock_bh(&idev->lock);
4107 spin_lock(&ifp->lock);
4108 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4109 goto out;
4110
4111 net = dev_net(dev);
4112 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4113 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4114 READ_ONCE(idev->cnf.accept_dad) < 1) ||
4115 !(ifp->flags&IFA_F_TENTATIVE) ||
4116 ifp->flags & IFA_F_NODAD) {
4117 bool send_na = false;
4118
4119 if (ifp->flags & IFA_F_TENTATIVE &&
4120 !(ifp->flags & IFA_F_OPTIMISTIC))
4121 send_na = true;
4122 bump_id = ifp->flags & IFA_F_TENTATIVE;
4123 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4124 spin_unlock(&ifp->lock);
4125 read_unlock_bh(&idev->lock);
4126
4127 addrconf_dad_completed(ifp, bump_id, send_na);
4128 return;
4129 }
4130
4131 if (!(idev->if_flags & IF_READY)) {
4132 spin_unlock(&ifp->lock);
4133 read_unlock_bh(&idev->lock);
4134 /*
4135 * If the device is not ready:
4136 * - keep it tentative if it is a permanent address.
4137 * - otherwise, kill it.
4138 */
4139 in6_ifa_hold(ifp);
4140 addrconf_dad_stop(ifp, 0);
4141 return;
4142 }
4143
4144 /*
4145 * Optimistic nodes can start receiving
4146 * Frames right away
4147 */
4148 if (ifp->flags & IFA_F_OPTIMISTIC) {
4149 ip6_ins_rt(net, ifp->rt);
4150 if (ipv6_use_optimistic_addr(net, idev)) {
4151 /* Because optimistic nodes can use this address,
4152 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4153 */
4154 notify = true;
4155 }
4156 }
4157
4158 addrconf_dad_kick(ifp);
4159 out:
4160 spin_unlock(&ifp->lock);
4161 read_unlock_bh(&idev->lock);
4162 if (notify)
4163 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4164 }
4165
addrconf_dad_start(struct inet6_ifaddr * ifp)4166 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4167 {
4168 bool begin_dad = false;
4169
4170 spin_lock_bh(&ifp->lock);
4171 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4172 ifp->state = INET6_IFADDR_STATE_PREDAD;
4173 begin_dad = true;
4174 }
4175 spin_unlock_bh(&ifp->lock);
4176
4177 if (begin_dad)
4178 addrconf_mod_dad_work(ifp, 0);
4179 }
4180
addrconf_dad_work(struct work_struct * w)4181 static void addrconf_dad_work(struct work_struct *w)
4182 {
4183 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4184 struct inet6_ifaddr,
4185 dad_work);
4186 struct inet6_dev *idev = ifp->idev;
4187 bool bump_id, disable_ipv6 = false;
4188 struct in6_addr mcaddr;
4189
4190 enum {
4191 DAD_PROCESS,
4192 DAD_BEGIN,
4193 DAD_ABORT,
4194 } action = DAD_PROCESS;
4195
4196 rtnl_lock();
4197
4198 spin_lock_bh(&ifp->lock);
4199 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4200 action = DAD_BEGIN;
4201 ifp->state = INET6_IFADDR_STATE_DAD;
4202 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4203 action = DAD_ABORT;
4204 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4205
4206 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4207 READ_ONCE(idev->cnf.accept_dad) > 1) &&
4208 !idev->cnf.disable_ipv6 &&
4209 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4210 struct in6_addr addr;
4211
4212 addr.s6_addr32[0] = htonl(0xfe800000);
4213 addr.s6_addr32[1] = 0;
4214
4215 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4216 ipv6_addr_equal(&ifp->addr, &addr)) {
4217 /* DAD failed for link-local based on MAC */
4218 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4219
4220 pr_info("%s: IPv6 being disabled!\n",
4221 ifp->idev->dev->name);
4222 disable_ipv6 = true;
4223 }
4224 }
4225 }
4226 spin_unlock_bh(&ifp->lock);
4227
4228 if (action == DAD_BEGIN) {
4229 addrconf_dad_begin(ifp);
4230 goto out;
4231 } else if (action == DAD_ABORT) {
4232 in6_ifa_hold(ifp);
4233 addrconf_dad_stop(ifp, 1);
4234 if (disable_ipv6)
4235 addrconf_ifdown(idev->dev, false);
4236 goto out;
4237 }
4238
4239 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4240 goto out;
4241
4242 write_lock_bh(&idev->lock);
4243 if (idev->dead || !(idev->if_flags & IF_READY)) {
4244 write_unlock_bh(&idev->lock);
4245 goto out;
4246 }
4247
4248 spin_lock(&ifp->lock);
4249 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4250 spin_unlock(&ifp->lock);
4251 write_unlock_bh(&idev->lock);
4252 goto out;
4253 }
4254
4255 if (ifp->dad_probes == 0) {
4256 bool send_na = false;
4257
4258 /*
4259 * DAD was successful
4260 */
4261
4262 if (ifp->flags & IFA_F_TENTATIVE &&
4263 !(ifp->flags & IFA_F_OPTIMISTIC))
4264 send_na = true;
4265 bump_id = ifp->flags & IFA_F_TENTATIVE;
4266 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4267 spin_unlock(&ifp->lock);
4268 write_unlock_bh(&idev->lock);
4269
4270 addrconf_dad_completed(ifp, bump_id, send_na);
4271
4272 goto out;
4273 }
4274
4275 ifp->dad_probes--;
4276 addrconf_mod_dad_work(ifp,
4277 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4278 HZ/100));
4279 spin_unlock(&ifp->lock);
4280 write_unlock_bh(&idev->lock);
4281
4282 /* send a neighbour solicitation for our addr */
4283 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4284 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4285 ifp->dad_nonce);
4286 out:
4287 in6_ifa_put(ifp);
4288 rtnl_unlock();
4289 }
4290
4291 /* ifp->idev must be at least read locked */
ipv6_lonely_lladdr(struct inet6_ifaddr * ifp)4292 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4293 {
4294 struct inet6_ifaddr *ifpiter;
4295 struct inet6_dev *idev = ifp->idev;
4296
4297 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4298 if (ifpiter->scope > IFA_LINK)
4299 break;
4300 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4301 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4302 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4303 IFA_F_PERMANENT)
4304 return false;
4305 }
4306 return true;
4307 }
4308
addrconf_dad_completed(struct inet6_ifaddr * ifp,bool bump_id,bool send_na)4309 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4310 bool send_na)
4311 {
4312 struct net_device *dev = ifp->idev->dev;
4313 struct in6_addr lladdr;
4314 bool send_rs, send_mld;
4315
4316 addrconf_del_dad_work(ifp);
4317
4318 /*
4319 * Configure the address for reception. Now it is valid.
4320 */
4321
4322 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4323
4324 /* If added prefix is link local and we are prepared to process
4325 router advertisements, start sending router solicitations.
4326 */
4327
4328 read_lock_bh(&ifp->idev->lock);
4329 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4330 send_rs = send_mld &&
4331 ipv6_accept_ra(ifp->idev) &&
4332 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4333 (dev->flags & IFF_LOOPBACK) == 0 &&
4334 (dev->type != ARPHRD_TUNNEL) &&
4335 !netif_is_team_port(dev);
4336 read_unlock_bh(&ifp->idev->lock);
4337
4338 /* While dad is in progress mld report's source address is in6_addrany.
4339 * Resend with proper ll now.
4340 */
4341 if (send_mld)
4342 ipv6_mc_dad_complete(ifp->idev);
4343
4344 /* send unsolicited NA if enabled */
4345 if (send_na &&
4346 (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4347 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4348 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4349 /*router=*/ !!ifp->idev->cnf.forwarding,
4350 /*solicited=*/ false, /*override=*/ true,
4351 /*inc_opt=*/ true);
4352 }
4353
4354 if (send_rs) {
4355 /*
4356 * If a host as already performed a random delay
4357 * [...] as part of DAD [...] there is no need
4358 * to delay again before sending the first RS
4359 */
4360 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4361 return;
4362 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4363
4364 write_lock_bh(&ifp->idev->lock);
4365 spin_lock(&ifp->lock);
4366 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4367 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4368 ifp->idev->rs_probes = 1;
4369 ifp->idev->if_flags |= IF_RS_SENT;
4370 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4371 spin_unlock(&ifp->lock);
4372 write_unlock_bh(&ifp->idev->lock);
4373 }
4374
4375 if (bump_id)
4376 rt_genid_bump_ipv6(dev_net(dev));
4377
4378 /* Make sure that a new temporary address will be created
4379 * before this temporary address becomes deprecated.
4380 */
4381 if (ifp->flags & IFA_F_TEMPORARY)
4382 addrconf_verify_rtnl(dev_net(dev));
4383 }
4384
addrconf_dad_run(struct inet6_dev * idev,bool restart)4385 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4386 {
4387 struct inet6_ifaddr *ifp;
4388
4389 read_lock_bh(&idev->lock);
4390 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4391 spin_lock(&ifp->lock);
4392 if ((ifp->flags & IFA_F_TENTATIVE &&
4393 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4394 if (restart)
4395 ifp->state = INET6_IFADDR_STATE_PREDAD;
4396 addrconf_dad_kick(ifp);
4397 }
4398 spin_unlock(&ifp->lock);
4399 }
4400 read_unlock_bh(&idev->lock);
4401 }
4402
4403 #ifdef CONFIG_PROC_FS
4404 struct if6_iter_state {
4405 struct seq_net_private p;
4406 int bucket;
4407 int offset;
4408 };
4409
if6_get_first(struct seq_file * seq,loff_t pos)4410 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4411 {
4412 struct if6_iter_state *state = seq->private;
4413 struct net *net = seq_file_net(seq);
4414 struct inet6_ifaddr *ifa = NULL;
4415 int p = 0;
4416
4417 /* initial bucket if pos is 0 */
4418 if (pos == 0) {
4419 state->bucket = 0;
4420 state->offset = 0;
4421 }
4422
4423 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4424 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4425 addr_lst) {
4426 /* sync with offset */
4427 if (p < state->offset) {
4428 p++;
4429 continue;
4430 }
4431 return ifa;
4432 }
4433
4434 /* prepare for next bucket */
4435 state->offset = 0;
4436 p = 0;
4437 }
4438 return NULL;
4439 }
4440
if6_get_next(struct seq_file * seq,struct inet6_ifaddr * ifa)4441 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4442 struct inet6_ifaddr *ifa)
4443 {
4444 struct if6_iter_state *state = seq->private;
4445 struct net *net = seq_file_net(seq);
4446
4447 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4448 state->offset++;
4449 return ifa;
4450 }
4451
4452 state->offset = 0;
4453 while (++state->bucket < IN6_ADDR_HSIZE) {
4454 hlist_for_each_entry_rcu(ifa,
4455 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4456 return ifa;
4457 }
4458 }
4459
4460 return NULL;
4461 }
4462
if6_seq_start(struct seq_file * seq,loff_t * pos)4463 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4464 __acquires(rcu)
4465 {
4466 rcu_read_lock();
4467 return if6_get_first(seq, *pos);
4468 }
4469
if6_seq_next(struct seq_file * seq,void * v,loff_t * pos)4470 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4471 {
4472 struct inet6_ifaddr *ifa;
4473
4474 ifa = if6_get_next(seq, v);
4475 ++*pos;
4476 return ifa;
4477 }
4478
if6_seq_stop(struct seq_file * seq,void * v)4479 static void if6_seq_stop(struct seq_file *seq, void *v)
4480 __releases(rcu)
4481 {
4482 rcu_read_unlock();
4483 }
4484
if6_seq_show(struct seq_file * seq,void * v)4485 static int if6_seq_show(struct seq_file *seq, void *v)
4486 {
4487 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4488 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4489 &ifp->addr,
4490 ifp->idev->dev->ifindex,
4491 ifp->prefix_len,
4492 ifp->scope,
4493 (u8) ifp->flags,
4494 ifp->idev->dev->name);
4495 return 0;
4496 }
4497
4498 static const struct seq_operations if6_seq_ops = {
4499 .start = if6_seq_start,
4500 .next = if6_seq_next,
4501 .show = if6_seq_show,
4502 .stop = if6_seq_stop,
4503 };
4504
if6_proc_net_init(struct net * net)4505 static int __net_init if6_proc_net_init(struct net *net)
4506 {
4507 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4508 sizeof(struct if6_iter_state)))
4509 return -ENOMEM;
4510 return 0;
4511 }
4512
if6_proc_net_exit(struct net * net)4513 static void __net_exit if6_proc_net_exit(struct net *net)
4514 {
4515 remove_proc_entry("if_inet6", net->proc_net);
4516 }
4517
4518 static struct pernet_operations if6_proc_net_ops = {
4519 .init = if6_proc_net_init,
4520 .exit = if6_proc_net_exit,
4521 };
4522
if6_proc_init(void)4523 int __init if6_proc_init(void)
4524 {
4525 return register_pernet_subsys(&if6_proc_net_ops);
4526 }
4527
if6_proc_exit(void)4528 void if6_proc_exit(void)
4529 {
4530 unregister_pernet_subsys(&if6_proc_net_ops);
4531 }
4532 #endif /* CONFIG_PROC_FS */
4533
4534 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4535 /* Check if address is a home address configured on any interface. */
ipv6_chk_home_addr(struct net * net,const struct in6_addr * addr)4536 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4537 {
4538 unsigned int hash = inet6_addr_hash(net, addr);
4539 struct inet6_ifaddr *ifp = NULL;
4540 int ret = 0;
4541
4542 rcu_read_lock();
4543 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4544 if (ipv6_addr_equal(&ifp->addr, addr) &&
4545 (ifp->flags & IFA_F_HOMEADDRESS)) {
4546 ret = 1;
4547 break;
4548 }
4549 }
4550 rcu_read_unlock();
4551 return ret;
4552 }
4553 #endif
4554
4555 /* RFC6554 has some algorithm to avoid loops in segment routing by
4556 * checking if the segments contains any of a local interface address.
4557 *
4558 * Quote:
4559 *
4560 * To detect loops in the SRH, a router MUST determine if the SRH
4561 * includes multiple addresses assigned to any interface on that router.
4562 * If such addresses appear more than once and are separated by at least
4563 * one address not assigned to that router.
4564 */
ipv6_chk_rpl_srh_loop(struct net * net,const struct in6_addr * segs,unsigned char nsegs)4565 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4566 unsigned char nsegs)
4567 {
4568 const struct in6_addr *addr;
4569 int i, ret = 0, found = 0;
4570 struct inet6_ifaddr *ifp;
4571 bool separated = false;
4572 unsigned int hash;
4573 bool hash_found;
4574
4575 rcu_read_lock();
4576 for (i = 0; i < nsegs; i++) {
4577 addr = &segs[i];
4578 hash = inet6_addr_hash(net, addr);
4579
4580 hash_found = false;
4581 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4582
4583 if (ipv6_addr_equal(&ifp->addr, addr)) {
4584 hash_found = true;
4585 break;
4586 }
4587 }
4588
4589 if (hash_found) {
4590 if (found > 1 && separated) {
4591 ret = 1;
4592 break;
4593 }
4594
4595 separated = false;
4596 found++;
4597 } else {
4598 separated = true;
4599 }
4600 }
4601 rcu_read_unlock();
4602
4603 return ret;
4604 }
4605
4606 /*
4607 * Periodic address status verification
4608 */
4609
addrconf_verify_rtnl(struct net * net)4610 static void addrconf_verify_rtnl(struct net *net)
4611 {
4612 unsigned long now, next, next_sec, next_sched;
4613 struct inet6_ifaddr *ifp;
4614 int i;
4615
4616 ASSERT_RTNL();
4617
4618 rcu_read_lock_bh();
4619 now = jiffies;
4620 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4621
4622 cancel_delayed_work(&net->ipv6.addr_chk_work);
4623
4624 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4625 restart:
4626 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4627 unsigned long age;
4628
4629 /* When setting preferred_lft to a value not zero or
4630 * infinity, while valid_lft is infinity
4631 * IFA_F_PERMANENT has a non-infinity life time.
4632 */
4633 if ((ifp->flags & IFA_F_PERMANENT) &&
4634 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4635 continue;
4636
4637 spin_lock(&ifp->lock);
4638 /* We try to batch several events at once. */
4639 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4640
4641 if ((ifp->flags&IFA_F_TEMPORARY) &&
4642 !(ifp->flags&IFA_F_TENTATIVE) &&
4643 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4644 !ifp->regen_count && ifp->ifpub) {
4645 /* This is a non-regenerated temporary addr. */
4646
4647 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4648
4649 if (age + regen_advance >= ifp->prefered_lft) {
4650 struct inet6_ifaddr *ifpub = ifp->ifpub;
4651 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4652 next = ifp->tstamp + ifp->prefered_lft * HZ;
4653
4654 ifp->regen_count++;
4655 in6_ifa_hold(ifp);
4656 in6_ifa_hold(ifpub);
4657 spin_unlock(&ifp->lock);
4658
4659 spin_lock(&ifpub->lock);
4660 ifpub->regen_count = 0;
4661 spin_unlock(&ifpub->lock);
4662 rcu_read_unlock_bh();
4663 ipv6_create_tempaddr(ifpub, true);
4664 in6_ifa_put(ifpub);
4665 in6_ifa_put(ifp);
4666 rcu_read_lock_bh();
4667 goto restart;
4668 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4669 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4670 }
4671
4672 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4673 age >= ifp->valid_lft) {
4674 spin_unlock(&ifp->lock);
4675 in6_ifa_hold(ifp);
4676 rcu_read_unlock_bh();
4677 ipv6_del_addr(ifp);
4678 rcu_read_lock_bh();
4679 goto restart;
4680 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4681 spin_unlock(&ifp->lock);
4682 continue;
4683 } else if (age >= ifp->prefered_lft) {
4684 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4685 int deprecate = 0;
4686
4687 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4688 deprecate = 1;
4689 ifp->flags |= IFA_F_DEPRECATED;
4690 }
4691
4692 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4693 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4694 next = ifp->tstamp + ifp->valid_lft * HZ;
4695
4696 spin_unlock(&ifp->lock);
4697
4698 if (deprecate) {
4699 in6_ifa_hold(ifp);
4700
4701 ipv6_ifa_notify(0, ifp);
4702 in6_ifa_put(ifp);
4703 goto restart;
4704 }
4705 } else {
4706 /* ifp->prefered_lft <= ifp->valid_lft */
4707 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4708 next = ifp->tstamp + ifp->prefered_lft * HZ;
4709 spin_unlock(&ifp->lock);
4710 }
4711 }
4712 }
4713
4714 next_sec = round_jiffies_up(next);
4715 next_sched = next;
4716
4717 /* If rounded timeout is accurate enough, accept it. */
4718 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4719 next_sched = next_sec;
4720
4721 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4722 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4723 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4724
4725 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4726 now, next, next_sec, next_sched);
4727 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4728 rcu_read_unlock_bh();
4729 }
4730
addrconf_verify_work(struct work_struct * w)4731 static void addrconf_verify_work(struct work_struct *w)
4732 {
4733 struct net *net = container_of(to_delayed_work(w), struct net,
4734 ipv6.addr_chk_work);
4735
4736 rtnl_lock();
4737 addrconf_verify_rtnl(net);
4738 rtnl_unlock();
4739 }
4740
addrconf_verify(struct net * net)4741 static void addrconf_verify(struct net *net)
4742 {
4743 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4744 }
4745
extract_addr(struct nlattr * addr,struct nlattr * local,struct in6_addr ** peer_pfx)4746 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4747 struct in6_addr **peer_pfx)
4748 {
4749 struct in6_addr *pfx = NULL;
4750
4751 *peer_pfx = NULL;
4752
4753 if (addr)
4754 pfx = nla_data(addr);
4755
4756 if (local) {
4757 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4758 *peer_pfx = pfx;
4759 pfx = nla_data(local);
4760 }
4761
4762 return pfx;
4763 }
4764
4765 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4766 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4767 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4768 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4769 [IFA_FLAGS] = { .len = sizeof(u32) },
4770 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4771 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4772 [IFA_PROTO] = { .type = NLA_U8 },
4773 };
4774
4775 static int
inet6_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4776 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4777 struct netlink_ext_ack *extack)
4778 {
4779 struct net *net = sock_net(skb->sk);
4780 struct ifaddrmsg *ifm;
4781 struct nlattr *tb[IFA_MAX+1];
4782 struct in6_addr *pfx, *peer_pfx;
4783 u32 ifa_flags;
4784 int err;
4785
4786 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4787 ifa_ipv6_policy, extack);
4788 if (err < 0)
4789 return err;
4790
4791 ifm = nlmsg_data(nlh);
4792 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4793 if (!pfx)
4794 return -EINVAL;
4795
4796 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4797
4798 /* We ignore other flags so far. */
4799 ifa_flags &= IFA_F_MANAGETEMPADDR;
4800
4801 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4802 ifm->ifa_prefixlen, extack);
4803 }
4804
modify_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,u32 flags,bool modify_peer)4805 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4806 unsigned long expires, u32 flags,
4807 bool modify_peer)
4808 {
4809 struct fib6_table *table;
4810 struct fib6_info *f6i;
4811 u32 prio;
4812
4813 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4814 ifp->prefix_len,
4815 ifp->idev->dev, 0, RTF_DEFAULT, true);
4816 if (!f6i)
4817 return -ENOENT;
4818
4819 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4820 if (f6i->fib6_metric != prio) {
4821 /* delete old one */
4822 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4823
4824 /* add new one */
4825 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4826 ifp->prefix_len,
4827 ifp->rt_priority, ifp->idev->dev,
4828 expires, flags, GFP_KERNEL);
4829 } else {
4830 table = f6i->fib6_table;
4831 spin_lock_bh(&table->tb6_lock);
4832
4833 if (!(flags & RTF_EXPIRES)) {
4834 fib6_clean_expires(f6i);
4835 fib6_remove_gc_list(f6i);
4836 } else {
4837 fib6_set_expires(f6i, expires);
4838 fib6_add_gc_list(f6i);
4839 }
4840
4841 spin_unlock_bh(&table->tb6_lock);
4842
4843 fib6_info_release(f6i);
4844 }
4845
4846 return 0;
4847 }
4848
inet6_addr_modify(struct net * net,struct inet6_ifaddr * ifp,struct ifa6_config * cfg)4849 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4850 struct ifa6_config *cfg)
4851 {
4852 u32 flags;
4853 clock_t expires;
4854 unsigned long timeout;
4855 bool was_managetempaddr;
4856 bool had_prefixroute;
4857 bool new_peer = false;
4858
4859 ASSERT_RTNL();
4860
4861 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4862 return -EINVAL;
4863
4864 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4865 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4866 return -EINVAL;
4867
4868 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4869 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4870
4871 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4872 if (addrconf_finite_timeout(timeout)) {
4873 expires = jiffies_to_clock_t(timeout * HZ);
4874 cfg->valid_lft = timeout;
4875 flags = RTF_EXPIRES;
4876 } else {
4877 expires = 0;
4878 flags = 0;
4879 cfg->ifa_flags |= IFA_F_PERMANENT;
4880 }
4881
4882 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4883 if (addrconf_finite_timeout(timeout)) {
4884 if (timeout == 0)
4885 cfg->ifa_flags |= IFA_F_DEPRECATED;
4886 cfg->preferred_lft = timeout;
4887 }
4888
4889 if (cfg->peer_pfx &&
4890 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4891 if (!ipv6_addr_any(&ifp->peer_addr))
4892 cleanup_prefix_route(ifp, expires, true, true);
4893 new_peer = true;
4894 }
4895
4896 spin_lock_bh(&ifp->lock);
4897 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4898 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4899 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4900 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4901 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4902 IFA_F_NOPREFIXROUTE);
4903 ifp->flags |= cfg->ifa_flags;
4904 WRITE_ONCE(ifp->tstamp, jiffies);
4905 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4906 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4907 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4908
4909 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4910 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4911
4912 if (new_peer)
4913 ifp->peer_addr = *cfg->peer_pfx;
4914
4915 spin_unlock_bh(&ifp->lock);
4916 if (!(ifp->flags&IFA_F_TENTATIVE))
4917 ipv6_ifa_notify(0, ifp);
4918
4919 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4920 int rc = -ENOENT;
4921
4922 if (had_prefixroute)
4923 rc = modify_prefix_route(ifp, expires, flags, false);
4924
4925 /* prefix route could have been deleted; if so restore it */
4926 if (rc == -ENOENT) {
4927 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4928 ifp->rt_priority, ifp->idev->dev,
4929 expires, flags, GFP_KERNEL);
4930 }
4931
4932 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4933 rc = modify_prefix_route(ifp, expires, flags, true);
4934
4935 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4936 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4937 ifp->rt_priority, ifp->idev->dev,
4938 expires, flags, GFP_KERNEL);
4939 }
4940 } else if (had_prefixroute) {
4941 enum cleanup_prefix_rt_t action;
4942 unsigned long rt_expires;
4943
4944 write_lock_bh(&ifp->idev->lock);
4945 action = check_cleanup_prefix_route(ifp, &rt_expires);
4946 write_unlock_bh(&ifp->idev->lock);
4947
4948 if (action != CLEANUP_PREFIX_RT_NOP) {
4949 cleanup_prefix_route(ifp, rt_expires,
4950 action == CLEANUP_PREFIX_RT_DEL, false);
4951 }
4952 }
4953
4954 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4955 if (was_managetempaddr &&
4956 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4957 cfg->valid_lft = 0;
4958 cfg->preferred_lft = 0;
4959 }
4960 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4961 cfg->preferred_lft, !was_managetempaddr,
4962 jiffies);
4963 }
4964
4965 addrconf_verify_rtnl(net);
4966
4967 return 0;
4968 }
4969
4970 static int
inet6_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4971 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4972 struct netlink_ext_ack *extack)
4973 {
4974 struct net *net = sock_net(skb->sk);
4975 struct ifaddrmsg *ifm;
4976 struct nlattr *tb[IFA_MAX+1];
4977 struct in6_addr *peer_pfx;
4978 struct inet6_ifaddr *ifa;
4979 struct net_device *dev;
4980 struct inet6_dev *idev;
4981 struct ifa6_config cfg;
4982 int err;
4983
4984 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4985 ifa_ipv6_policy, extack);
4986 if (err < 0)
4987 return err;
4988
4989 memset(&cfg, 0, sizeof(cfg));
4990
4991 ifm = nlmsg_data(nlh);
4992 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4993 if (!cfg.pfx)
4994 return -EINVAL;
4995
4996 cfg.peer_pfx = peer_pfx;
4997 cfg.plen = ifm->ifa_prefixlen;
4998 if (tb[IFA_RT_PRIORITY])
4999 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
5000
5001 if (tb[IFA_PROTO])
5002 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
5003
5004 cfg.valid_lft = INFINITY_LIFE_TIME;
5005 cfg.preferred_lft = INFINITY_LIFE_TIME;
5006
5007 if (tb[IFA_CACHEINFO]) {
5008 struct ifa_cacheinfo *ci;
5009
5010 ci = nla_data(tb[IFA_CACHEINFO]);
5011 cfg.valid_lft = ci->ifa_valid;
5012 cfg.preferred_lft = ci->ifa_prefered;
5013 }
5014
5015 dev = __dev_get_by_index(net, ifm->ifa_index);
5016 if (!dev) {
5017 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5018 return -ENODEV;
5019 }
5020
5021 if (tb[IFA_FLAGS])
5022 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
5023 else
5024 cfg.ifa_flags = ifm->ifa_flags;
5025
5026 /* We ignore other flags so far. */
5027 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5028 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5029 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5030
5031 idev = ipv6_find_idev(dev);
5032 if (IS_ERR(idev))
5033 return PTR_ERR(idev);
5034
5035 if (!ipv6_allow_optimistic_dad(net, idev))
5036 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5037
5038 if (cfg.ifa_flags & IFA_F_NODAD &&
5039 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5040 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5041 return -EINVAL;
5042 }
5043
5044 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5045 if (!ifa) {
5046 /*
5047 * It would be best to check for !NLM_F_CREATE here but
5048 * userspace already relies on not having to provide this.
5049 */
5050 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5051 }
5052
5053 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5054 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5055 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5056 err = -EEXIST;
5057 } else {
5058 err = inet6_addr_modify(net, ifa, &cfg);
5059 }
5060
5061 in6_ifa_put(ifa);
5062
5063 return err;
5064 }
5065
put_ifaddrmsg(struct nlmsghdr * nlh,u8 prefixlen,u32 flags,u8 scope,int ifindex)5066 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5067 u8 scope, int ifindex)
5068 {
5069 struct ifaddrmsg *ifm;
5070
5071 ifm = nlmsg_data(nlh);
5072 ifm->ifa_family = AF_INET6;
5073 ifm->ifa_prefixlen = prefixlen;
5074 ifm->ifa_flags = flags;
5075 ifm->ifa_scope = scope;
5076 ifm->ifa_index = ifindex;
5077 }
5078
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)5079 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5080 unsigned long tstamp, u32 preferred, u32 valid)
5081 {
5082 struct ifa_cacheinfo ci;
5083
5084 ci.cstamp = cstamp_delta(cstamp);
5085 ci.tstamp = cstamp_delta(tstamp);
5086 ci.ifa_prefered = preferred;
5087 ci.ifa_valid = valid;
5088
5089 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5090 }
5091
rt_scope(int ifa_scope)5092 static inline int rt_scope(int ifa_scope)
5093 {
5094 if (ifa_scope & IFA_HOST)
5095 return RT_SCOPE_HOST;
5096 else if (ifa_scope & IFA_LINK)
5097 return RT_SCOPE_LINK;
5098 else if (ifa_scope & IFA_SITE)
5099 return RT_SCOPE_SITE;
5100 else
5101 return RT_SCOPE_UNIVERSE;
5102 }
5103
inet6_ifaddr_msgsize(void)5104 static inline int inet6_ifaddr_msgsize(void)
5105 {
5106 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5107 + nla_total_size(16) /* IFA_LOCAL */
5108 + nla_total_size(16) /* IFA_ADDRESS */
5109 + nla_total_size(sizeof(struct ifa_cacheinfo))
5110 + nla_total_size(4) /* IFA_FLAGS */
5111 + nla_total_size(1) /* IFA_PROTO */
5112 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5113 }
5114
5115 enum addr_type_t {
5116 UNICAST_ADDR,
5117 MULTICAST_ADDR,
5118 ANYCAST_ADDR,
5119 };
5120
5121 struct inet6_fill_args {
5122 u32 portid;
5123 u32 seq;
5124 int event;
5125 unsigned int flags;
5126 int netnsid;
5127 int ifindex;
5128 enum addr_type_t type;
5129 };
5130
inet6_fill_ifaddr(struct sk_buff * skb,const struct inet6_ifaddr * ifa,struct inet6_fill_args * args)5131 static int inet6_fill_ifaddr(struct sk_buff *skb,
5132 const struct inet6_ifaddr *ifa,
5133 struct inet6_fill_args *args)
5134 {
5135 struct nlmsghdr *nlh;
5136 u32 preferred, valid;
5137 u32 flags, priority;
5138 u8 proto;
5139
5140 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5141 sizeof(struct ifaddrmsg), args->flags);
5142 if (!nlh)
5143 return -EMSGSIZE;
5144
5145 flags = READ_ONCE(ifa->flags);
5146 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5147 ifa->idev->dev->ifindex);
5148
5149 if (args->netnsid >= 0 &&
5150 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5151 goto error;
5152
5153 preferred = READ_ONCE(ifa->prefered_lft);
5154 valid = READ_ONCE(ifa->valid_lft);
5155
5156 if (!((flags & IFA_F_PERMANENT) &&
5157 (preferred == INFINITY_LIFE_TIME))) {
5158 if (preferred != INFINITY_LIFE_TIME) {
5159 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5160
5161 if (preferred > tval)
5162 preferred -= tval;
5163 else
5164 preferred = 0;
5165 if (valid != INFINITY_LIFE_TIME) {
5166 if (valid > tval)
5167 valid -= tval;
5168 else
5169 valid = 0;
5170 }
5171 }
5172 } else {
5173 preferred = INFINITY_LIFE_TIME;
5174 valid = INFINITY_LIFE_TIME;
5175 }
5176
5177 if (!ipv6_addr_any(&ifa->peer_addr)) {
5178 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5179 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5180 goto error;
5181 } else {
5182 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5183 goto error;
5184 }
5185
5186 priority = READ_ONCE(ifa->rt_priority);
5187 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5188 goto error;
5189
5190 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5191 preferred, valid) < 0)
5192 goto error;
5193
5194 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5195 goto error;
5196
5197 proto = READ_ONCE(ifa->ifa_proto);
5198 if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5199 goto error;
5200
5201 nlmsg_end(skb, nlh);
5202 return 0;
5203
5204 error:
5205 nlmsg_cancel(skb, nlh);
5206 return -EMSGSIZE;
5207 }
5208
inet6_fill_ifmcaddr(struct sk_buff * skb,const struct ifmcaddr6 * ifmca,struct inet6_fill_args * args)5209 static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5210 const struct ifmcaddr6 *ifmca,
5211 struct inet6_fill_args *args)
5212 {
5213 int ifindex = ifmca->idev->dev->ifindex;
5214 u8 scope = RT_SCOPE_UNIVERSE;
5215 struct nlmsghdr *nlh;
5216
5217 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5218 scope = RT_SCOPE_SITE;
5219
5220 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5221 sizeof(struct ifaddrmsg), args->flags);
5222 if (!nlh)
5223 return -EMSGSIZE;
5224
5225 if (args->netnsid >= 0 &&
5226 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5227 nlmsg_cancel(skb, nlh);
5228 return -EMSGSIZE;
5229 }
5230
5231 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5232 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5233 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5234 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5235 nlmsg_cancel(skb, nlh);
5236 return -EMSGSIZE;
5237 }
5238
5239 nlmsg_end(skb, nlh);
5240 return 0;
5241 }
5242
inet6_fill_ifacaddr(struct sk_buff * skb,const struct ifacaddr6 * ifaca,struct inet6_fill_args * args)5243 static int inet6_fill_ifacaddr(struct sk_buff *skb,
5244 const struct ifacaddr6 *ifaca,
5245 struct inet6_fill_args *args)
5246 {
5247 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5248 int ifindex = dev ? dev->ifindex : 1;
5249 u8 scope = RT_SCOPE_UNIVERSE;
5250 struct nlmsghdr *nlh;
5251
5252 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5253 scope = RT_SCOPE_SITE;
5254
5255 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5256 sizeof(struct ifaddrmsg), args->flags);
5257 if (!nlh)
5258 return -EMSGSIZE;
5259
5260 if (args->netnsid >= 0 &&
5261 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5262 nlmsg_cancel(skb, nlh);
5263 return -EMSGSIZE;
5264 }
5265
5266 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5267 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5268 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5269 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5270 nlmsg_cancel(skb, nlh);
5271 return -EMSGSIZE;
5272 }
5273
5274 nlmsg_end(skb, nlh);
5275 return 0;
5276 }
5277
5278 /* called with rcu_read_lock() */
in6_dump_addrs(const struct inet6_dev * idev,struct sk_buff * skb,struct netlink_callback * cb,int * s_ip_idx,struct inet6_fill_args * fillargs)5279 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5280 struct netlink_callback *cb, int *s_ip_idx,
5281 struct inet6_fill_args *fillargs)
5282 {
5283 const struct ifmcaddr6 *ifmca;
5284 const struct ifacaddr6 *ifaca;
5285 int ip_idx = 0;
5286 int err = 0;
5287
5288 switch (fillargs->type) {
5289 case UNICAST_ADDR: {
5290 const struct inet6_ifaddr *ifa;
5291 fillargs->event = RTM_NEWADDR;
5292
5293 /* unicast address incl. temp addr */
5294 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5295 if (ip_idx < *s_ip_idx)
5296 goto next;
5297 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5298 if (err < 0)
5299 break;
5300 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5301 next:
5302 ip_idx++;
5303 }
5304 break;
5305 }
5306 case MULTICAST_ADDR:
5307 fillargs->event = RTM_GETMULTICAST;
5308
5309 /* multicast address */
5310 for (ifmca = rcu_dereference(idev->mc_list);
5311 ifmca;
5312 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5313 if (ip_idx < *s_ip_idx)
5314 continue;
5315 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5316 if (err < 0)
5317 break;
5318 }
5319 break;
5320 case ANYCAST_ADDR:
5321 fillargs->event = RTM_GETANYCAST;
5322 /* anycast address */
5323 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5324 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5325 if (ip_idx < *s_ip_idx)
5326 continue;
5327 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5328 if (err < 0)
5329 break;
5330 }
5331 break;
5332 default:
5333 break;
5334 }
5335 *s_ip_idx = err ? ip_idx : 0;
5336 return err;
5337 }
5338
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)5339 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5340 struct inet6_fill_args *fillargs,
5341 struct net **tgt_net, struct sock *sk,
5342 struct netlink_callback *cb)
5343 {
5344 struct netlink_ext_ack *extack = cb->extack;
5345 struct nlattr *tb[IFA_MAX+1];
5346 struct ifaddrmsg *ifm;
5347 int err, i;
5348
5349 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5350 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5351 return -EINVAL;
5352 }
5353
5354 ifm = nlmsg_data(nlh);
5355 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5356 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5357 return -EINVAL;
5358 }
5359
5360 fillargs->ifindex = ifm->ifa_index;
5361 if (fillargs->ifindex) {
5362 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5363 fillargs->flags |= NLM_F_DUMP_FILTERED;
5364 }
5365
5366 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5367 ifa_ipv6_policy, extack);
5368 if (err < 0)
5369 return err;
5370
5371 for (i = 0; i <= IFA_MAX; ++i) {
5372 if (!tb[i])
5373 continue;
5374
5375 if (i == IFA_TARGET_NETNSID) {
5376 struct net *net;
5377
5378 fillargs->netnsid = nla_get_s32(tb[i]);
5379 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5380 if (IS_ERR(net)) {
5381 fillargs->netnsid = -1;
5382 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5383 return PTR_ERR(net);
5384 }
5385 *tgt_net = net;
5386 } else {
5387 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5388 return -EINVAL;
5389 }
5390 }
5391
5392 return 0;
5393 }
5394
inet6_dump_addr(struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type)5395 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5396 enum addr_type_t type)
5397 {
5398 struct net *tgt_net = sock_net(skb->sk);
5399 const struct nlmsghdr *nlh = cb->nlh;
5400 struct inet6_fill_args fillargs = {
5401 .portid = NETLINK_CB(cb->skb).portid,
5402 .seq = cb->nlh->nlmsg_seq,
5403 .flags = NLM_F_MULTI,
5404 .netnsid = -1,
5405 .type = type,
5406 };
5407 struct {
5408 unsigned long ifindex;
5409 int ip_idx;
5410 } *ctx = (void *)cb->ctx;
5411 struct net_device *dev;
5412 struct inet6_dev *idev;
5413 int err = 0;
5414
5415 rcu_read_lock();
5416 if (cb->strict_check) {
5417 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5418 skb->sk, cb);
5419 if (err < 0)
5420 goto done;
5421
5422 err = 0;
5423 if (fillargs.ifindex) {
5424 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5425 if (!dev) {
5426 err = -ENODEV;
5427 goto done;
5428 }
5429 idev = __in6_dev_get(dev);
5430 if (idev)
5431 err = in6_dump_addrs(idev, skb, cb,
5432 &ctx->ip_idx,
5433 &fillargs);
5434 goto done;
5435 }
5436 }
5437
5438 cb->seq = inet6_base_seq(tgt_net);
5439 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5440 idev = __in6_dev_get(dev);
5441 if (!idev)
5442 continue;
5443 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5444 &fillargs);
5445 if (err < 0)
5446 goto done;
5447 }
5448 done:
5449 rcu_read_unlock();
5450 if (fillargs.netnsid >= 0)
5451 put_net(tgt_net);
5452
5453 return err;
5454 }
5455
inet6_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)5456 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5457 {
5458 enum addr_type_t type = UNICAST_ADDR;
5459
5460 return inet6_dump_addr(skb, cb, type);
5461 }
5462
inet6_dump_ifmcaddr(struct sk_buff * skb,struct netlink_callback * cb)5463 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5464 {
5465 enum addr_type_t type = MULTICAST_ADDR;
5466
5467 return inet6_dump_addr(skb, cb, type);
5468 }
5469
5470
inet6_dump_ifacaddr(struct sk_buff * skb,struct netlink_callback * cb)5471 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5472 {
5473 enum addr_type_t type = ANYCAST_ADDR;
5474
5475 return inet6_dump_addr(skb, cb, type);
5476 }
5477
inet6_rtm_valid_getaddr_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)5478 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5479 const struct nlmsghdr *nlh,
5480 struct nlattr **tb,
5481 struct netlink_ext_ack *extack)
5482 {
5483 struct ifaddrmsg *ifm;
5484 int i, err;
5485
5486 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5487 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5488 return -EINVAL;
5489 }
5490
5491 if (!netlink_strict_get_check(skb))
5492 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5493 ifa_ipv6_policy, extack);
5494
5495 ifm = nlmsg_data(nlh);
5496 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5497 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5498 return -EINVAL;
5499 }
5500
5501 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5502 ifa_ipv6_policy, extack);
5503 if (err)
5504 return err;
5505
5506 for (i = 0; i <= IFA_MAX; i++) {
5507 if (!tb[i])
5508 continue;
5509
5510 switch (i) {
5511 case IFA_TARGET_NETNSID:
5512 case IFA_ADDRESS:
5513 case IFA_LOCAL:
5514 break;
5515 default:
5516 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5517 return -EINVAL;
5518 }
5519 }
5520
5521 return 0;
5522 }
5523
inet6_rtm_getaddr(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5524 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5525 struct netlink_ext_ack *extack)
5526 {
5527 struct net *tgt_net = sock_net(in_skb->sk);
5528 struct inet6_fill_args fillargs = {
5529 .portid = NETLINK_CB(in_skb).portid,
5530 .seq = nlh->nlmsg_seq,
5531 .event = RTM_NEWADDR,
5532 .flags = 0,
5533 .netnsid = -1,
5534 };
5535 struct ifaddrmsg *ifm;
5536 struct nlattr *tb[IFA_MAX+1];
5537 struct in6_addr *addr = NULL, *peer;
5538 struct net_device *dev = NULL;
5539 struct inet6_ifaddr *ifa;
5540 struct sk_buff *skb;
5541 int err;
5542
5543 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5544 if (err < 0)
5545 return err;
5546
5547 if (tb[IFA_TARGET_NETNSID]) {
5548 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5549
5550 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5551 fillargs.netnsid);
5552 if (IS_ERR(tgt_net))
5553 return PTR_ERR(tgt_net);
5554 }
5555
5556 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5557 if (!addr) {
5558 err = -EINVAL;
5559 goto errout;
5560 }
5561 ifm = nlmsg_data(nlh);
5562 if (ifm->ifa_index)
5563 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5564
5565 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5566 if (!ifa) {
5567 err = -EADDRNOTAVAIL;
5568 goto errout;
5569 }
5570
5571 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5572 if (!skb) {
5573 err = -ENOBUFS;
5574 goto errout_ifa;
5575 }
5576
5577 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5578 if (err < 0) {
5579 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5580 WARN_ON(err == -EMSGSIZE);
5581 kfree_skb(skb);
5582 goto errout_ifa;
5583 }
5584 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5585 errout_ifa:
5586 in6_ifa_put(ifa);
5587 errout:
5588 dev_put(dev);
5589 if (fillargs.netnsid >= 0)
5590 put_net(tgt_net);
5591
5592 return err;
5593 }
5594
inet6_ifa_notify(int event,struct inet6_ifaddr * ifa)5595 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5596 {
5597 struct sk_buff *skb;
5598 struct net *net = dev_net(ifa->idev->dev);
5599 struct inet6_fill_args fillargs = {
5600 .portid = 0,
5601 .seq = 0,
5602 .event = event,
5603 .flags = 0,
5604 .netnsid = -1,
5605 };
5606 int err = -ENOBUFS;
5607
5608 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5609 if (!skb)
5610 goto errout;
5611
5612 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5613 if (err < 0) {
5614 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5615 WARN_ON(err == -EMSGSIZE);
5616 kfree_skb(skb);
5617 goto errout;
5618 }
5619 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5620 return;
5621 errout:
5622 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5623 }
5624
ipv6_store_devconf(const struct ipv6_devconf * cnf,__s32 * array,int bytes)5625 static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5626 __s32 *array, int bytes)
5627 {
5628 BUG_ON(bytes < (DEVCONF_MAX * 4));
5629
5630 memset(array, 0, bytes);
5631 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5632 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5633 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5634 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5635 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5636 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5637 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5638 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5639 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5640 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5641 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5642 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5643 array[DEVCONF_RTR_SOLICIT_DELAY] =
5644 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5645 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5646 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5647 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5648 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5649 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5650 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5651 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5652 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5653 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5654 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5655 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5656 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5657 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5658 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5659 READ_ONCE(cnf->accept_ra_min_hop_limit);
5660 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5661 #ifdef CONFIG_IPV6_ROUTER_PREF
5662 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5663 array[DEVCONF_RTR_PROBE_INTERVAL] =
5664 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5665 #ifdef CONFIG_IPV6_ROUTE_INFO
5666 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5667 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5668 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5669 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5670 #endif
5671 #endif
5672 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5673 array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5674 READ_ONCE(cnf->accept_source_route);
5675 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5676 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5677 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5678 #endif
5679 #ifdef CONFIG_IPV6_MROUTE
5680 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5681 #endif
5682 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5683 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5684 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5685 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5686 array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5687 READ_ONCE(cnf->suppress_frag_ndisc);
5688 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5689 READ_ONCE(cnf->accept_ra_from_local);
5690 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5691 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5692 READ_ONCE(cnf->ignore_routes_with_linkdown);
5693 /* we omit DEVCONF_STABLE_SECRET for now */
5694 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5695 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5696 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5697 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5698 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5699 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5700 #ifdef CONFIG_IPV6_SEG6_HMAC
5701 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5702 #endif
5703 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5704 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5705 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5706 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5707 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5708 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5709 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5710 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5711 array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5712 READ_ONCE(cnf->ndisc_evict_nocarrier);
5713 array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5714 READ_ONCE(cnf->accept_untracked_na);
5715 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5716 }
5717
inet6_ifla6_size(void)5718 static inline size_t inet6_ifla6_size(void)
5719 {
5720 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5721 + nla_total_size(sizeof(struct ifla_cacheinfo))
5722 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5723 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5724 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5725 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5726 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5727 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5728 + 0;
5729 }
5730
inet6_if_nlmsg_size(void)5731 static inline size_t inet6_if_nlmsg_size(void)
5732 {
5733 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5734 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5735 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5736 + nla_total_size(4) /* IFLA_MTU */
5737 + nla_total_size(4) /* IFLA_LINK */
5738 + nla_total_size(1) /* IFLA_OPERSTATE */
5739 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5740 }
5741
__snmp6_fill_statsdev(u64 * stats,atomic_long_t * mib,int bytes)5742 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5743 int bytes)
5744 {
5745 int i;
5746 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5747 BUG_ON(pad < 0);
5748
5749 /* Use put_unaligned() because stats may not be aligned for u64. */
5750 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5751 for (i = 1; i < ICMP6_MIB_MAX; i++)
5752 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5753
5754 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5755 }
5756
__snmp6_fill_stats64(u64 * stats,void __percpu * mib,int bytes,size_t syncpoff)5757 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5758 int bytes, size_t syncpoff)
5759 {
5760 int i, c;
5761 u64 buff[IPSTATS_MIB_MAX];
5762 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5763
5764 BUG_ON(pad < 0);
5765
5766 memset(buff, 0, sizeof(buff));
5767 buff[0] = IPSTATS_MIB_MAX;
5768
5769 for_each_possible_cpu(c) {
5770 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5771 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5772 }
5773
5774 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5775 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5776 }
5777
snmp6_fill_stats(u64 * stats,struct inet6_dev * idev,int attrtype,int bytes)5778 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5779 int bytes)
5780 {
5781 switch (attrtype) {
5782 case IFLA_INET6_STATS:
5783 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5784 offsetof(struct ipstats_mib, syncp));
5785 break;
5786 case IFLA_INET6_ICMP6STATS:
5787 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5788 break;
5789 }
5790 }
5791
inet6_fill_ifla6_attrs(struct sk_buff * skb,struct inet6_dev * idev,u32 ext_filter_mask)5792 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5793 u32 ext_filter_mask)
5794 {
5795 struct ifla_cacheinfo ci;
5796 struct nlattr *nla;
5797 u32 ra_mtu;
5798
5799 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5800 goto nla_put_failure;
5801 ci.max_reasm_len = IPV6_MAXPLEN;
5802 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5803 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5804 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5805 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5806 goto nla_put_failure;
5807 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5808 if (!nla)
5809 goto nla_put_failure;
5810 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5811
5812 /* XXX - MC not implemented */
5813
5814 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5815 return 0;
5816
5817 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5818 if (!nla)
5819 goto nla_put_failure;
5820 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5821
5822 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5823 if (!nla)
5824 goto nla_put_failure;
5825 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5826
5827 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5828 if (!nla)
5829 goto nla_put_failure;
5830 read_lock_bh(&idev->lock);
5831 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5832 read_unlock_bh(&idev->lock);
5833
5834 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5835 READ_ONCE(idev->cnf.addr_gen_mode)))
5836 goto nla_put_failure;
5837
5838 ra_mtu = READ_ONCE(idev->ra_mtu);
5839 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5840 goto nla_put_failure;
5841
5842 return 0;
5843
5844 nla_put_failure:
5845 return -EMSGSIZE;
5846 }
5847
inet6_get_link_af_size(const struct net_device * dev,u32 ext_filter_mask)5848 static size_t inet6_get_link_af_size(const struct net_device *dev,
5849 u32 ext_filter_mask)
5850 {
5851 if (!__in6_dev_get(dev))
5852 return 0;
5853
5854 return inet6_ifla6_size();
5855 }
5856
inet6_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)5857 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5858 u32 ext_filter_mask)
5859 {
5860 struct inet6_dev *idev = __in6_dev_get(dev);
5861
5862 if (!idev)
5863 return -ENODATA;
5864
5865 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5866 return -EMSGSIZE;
5867
5868 return 0;
5869 }
5870
inet6_set_iftoken(struct inet6_dev * idev,struct in6_addr * token,struct netlink_ext_ack * extack)5871 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5872 struct netlink_ext_ack *extack)
5873 {
5874 struct inet6_ifaddr *ifp;
5875 struct net_device *dev = idev->dev;
5876 bool clear_token, update_rs = false;
5877 struct in6_addr ll_addr;
5878
5879 ASSERT_RTNL();
5880
5881 if (!token)
5882 return -EINVAL;
5883
5884 if (dev->flags & IFF_LOOPBACK) {
5885 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5886 return -EINVAL;
5887 }
5888
5889 if (dev->flags & IFF_NOARP) {
5890 NL_SET_ERR_MSG_MOD(extack,
5891 "Device does not do neighbour discovery");
5892 return -EINVAL;
5893 }
5894
5895 if (!ipv6_accept_ra(idev)) {
5896 NL_SET_ERR_MSG_MOD(extack,
5897 "Router advertisement is disabled on device");
5898 return -EINVAL;
5899 }
5900
5901 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5902 NL_SET_ERR_MSG(extack,
5903 "Router solicitation is disabled on device");
5904 return -EINVAL;
5905 }
5906
5907 write_lock_bh(&idev->lock);
5908
5909 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5910 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5911
5912 write_unlock_bh(&idev->lock);
5913
5914 clear_token = ipv6_addr_any(token);
5915 if (clear_token)
5916 goto update_lft;
5917
5918 if (!idev->dead && (idev->if_flags & IF_READY) &&
5919 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5920 IFA_F_OPTIMISTIC)) {
5921 /* If we're not ready, then normal ifup will take care
5922 * of this. Otherwise, we need to request our rs here.
5923 */
5924 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5925 update_rs = true;
5926 }
5927
5928 update_lft:
5929 write_lock_bh(&idev->lock);
5930
5931 if (update_rs) {
5932 idev->if_flags |= IF_RS_SENT;
5933 idev->rs_interval = rfc3315_s14_backoff_init(
5934 READ_ONCE(idev->cnf.rtr_solicit_interval));
5935 idev->rs_probes = 1;
5936 addrconf_mod_rs_timer(idev, idev->rs_interval);
5937 }
5938
5939 /* Well, that's kinda nasty ... */
5940 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5941 spin_lock(&ifp->lock);
5942 if (ifp->tokenized) {
5943 ifp->valid_lft = 0;
5944 ifp->prefered_lft = 0;
5945 }
5946 spin_unlock(&ifp->lock);
5947 }
5948
5949 write_unlock_bh(&idev->lock);
5950 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5951 addrconf_verify_rtnl(dev_net(dev));
5952 return 0;
5953 }
5954
5955 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5956 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5957 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5958 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5959 .reject_message =
5960 "IFLA_INET6_RA_MTU can not be set" },
5961 };
5962
check_addr_gen_mode(int mode)5963 static int check_addr_gen_mode(int mode)
5964 {
5965 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5966 mode != IN6_ADDR_GEN_MODE_NONE &&
5967 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5968 mode != IN6_ADDR_GEN_MODE_RANDOM)
5969 return -EINVAL;
5970 return 1;
5971 }
5972
check_stable_privacy(struct inet6_dev * idev,struct net * net,int mode)5973 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5974 int mode)
5975 {
5976 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5977 !idev->cnf.stable_secret.initialized &&
5978 !net->ipv6.devconf_dflt->stable_secret.initialized)
5979 return -EINVAL;
5980 return 1;
5981 }
5982
inet6_validate_link_af(const struct net_device * dev,const struct nlattr * nla,struct netlink_ext_ack * extack)5983 static int inet6_validate_link_af(const struct net_device *dev,
5984 const struct nlattr *nla,
5985 struct netlink_ext_ack *extack)
5986 {
5987 struct nlattr *tb[IFLA_INET6_MAX + 1];
5988 struct inet6_dev *idev = NULL;
5989 int err;
5990
5991 if (dev) {
5992 idev = __in6_dev_get(dev);
5993 if (!idev)
5994 return -EAFNOSUPPORT;
5995 }
5996
5997 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5998 inet6_af_policy, extack);
5999 if (err)
6000 return err;
6001
6002 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6003 return -EINVAL;
6004
6005 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6006 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6007
6008 if (check_addr_gen_mode(mode) < 0)
6009 return -EINVAL;
6010 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6011 return -EINVAL;
6012 }
6013
6014 return 0;
6015 }
6016
inet6_set_link_af(struct net_device * dev,const struct nlattr * nla,struct netlink_ext_ack * extack)6017 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6018 struct netlink_ext_ack *extack)
6019 {
6020 struct inet6_dev *idev = __in6_dev_get(dev);
6021 struct nlattr *tb[IFLA_INET6_MAX + 1];
6022 int err;
6023
6024 if (!idev)
6025 return -EAFNOSUPPORT;
6026
6027 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6028 return -EINVAL;
6029
6030 if (tb[IFLA_INET6_TOKEN]) {
6031 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6032 extack);
6033 if (err)
6034 return err;
6035 }
6036
6037 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6038 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6039
6040 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6041 }
6042
6043 return 0;
6044 }
6045
inet6_fill_ifinfo(struct sk_buff * skb,struct inet6_dev * idev,u32 portid,u32 seq,int event,unsigned int flags)6046 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6047 u32 portid, u32 seq, int event, unsigned int flags)
6048 {
6049 struct net_device *dev = idev->dev;
6050 struct ifinfomsg *hdr;
6051 struct nlmsghdr *nlh;
6052 int ifindex, iflink;
6053 void *protoinfo;
6054
6055 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6056 if (!nlh)
6057 return -EMSGSIZE;
6058
6059 hdr = nlmsg_data(nlh);
6060 hdr->ifi_family = AF_INET6;
6061 hdr->__ifi_pad = 0;
6062 hdr->ifi_type = dev->type;
6063 ifindex = READ_ONCE(dev->ifindex);
6064 hdr->ifi_index = ifindex;
6065 hdr->ifi_flags = dev_get_flags(dev);
6066 hdr->ifi_change = 0;
6067
6068 iflink = dev_get_iflink(dev);
6069 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6070 (dev->addr_len &&
6071 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6072 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6073 (ifindex != iflink &&
6074 nla_put_u32(skb, IFLA_LINK, iflink)) ||
6075 nla_put_u8(skb, IFLA_OPERSTATE,
6076 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6077 goto nla_put_failure;
6078 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6079 if (!protoinfo)
6080 goto nla_put_failure;
6081
6082 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6083 goto nla_put_failure;
6084
6085 nla_nest_end(skb, protoinfo);
6086 nlmsg_end(skb, nlh);
6087 return 0;
6088
6089 nla_put_failure:
6090 nlmsg_cancel(skb, nlh);
6091 return -EMSGSIZE;
6092 }
6093
inet6_valid_dump_ifinfo(const struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6094 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6095 struct netlink_ext_ack *extack)
6096 {
6097 struct ifinfomsg *ifm;
6098
6099 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6100 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6101 return -EINVAL;
6102 }
6103
6104 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6105 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6106 return -EINVAL;
6107 }
6108
6109 ifm = nlmsg_data(nlh);
6110 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6111 ifm->ifi_change || ifm->ifi_index) {
6112 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6113 return -EINVAL;
6114 }
6115
6116 return 0;
6117 }
6118
inet6_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)6119 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6120 {
6121 struct net *net = sock_net(skb->sk);
6122 struct {
6123 unsigned long ifindex;
6124 } *ctx = (void *)cb->ctx;
6125 struct net_device *dev;
6126 struct inet6_dev *idev;
6127 int err;
6128
6129 /* only requests using strict checking can pass data to
6130 * influence the dump
6131 */
6132 if (cb->strict_check) {
6133 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6134
6135 if (err < 0)
6136 return err;
6137 }
6138
6139 err = 0;
6140 rcu_read_lock();
6141 for_each_netdev_dump(net, dev, ctx->ifindex) {
6142 idev = __in6_dev_get(dev);
6143 if (!idev)
6144 continue;
6145 err = inet6_fill_ifinfo(skb, idev,
6146 NETLINK_CB(cb->skb).portid,
6147 cb->nlh->nlmsg_seq,
6148 RTM_NEWLINK, NLM_F_MULTI);
6149 if (err < 0)
6150 break;
6151 }
6152 rcu_read_unlock();
6153
6154 return err;
6155 }
6156
inet6_ifinfo_notify(int event,struct inet6_dev * idev)6157 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6158 {
6159 struct sk_buff *skb;
6160 struct net *net = dev_net(idev->dev);
6161 int err = -ENOBUFS;
6162
6163 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6164 if (!skb)
6165 goto errout;
6166
6167 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6168 if (err < 0) {
6169 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6170 WARN_ON(err == -EMSGSIZE);
6171 kfree_skb(skb);
6172 goto errout;
6173 }
6174 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6175 return;
6176 errout:
6177 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6178 }
6179
inet6_prefix_nlmsg_size(void)6180 static inline size_t inet6_prefix_nlmsg_size(void)
6181 {
6182 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6183 + nla_total_size(sizeof(struct in6_addr))
6184 + nla_total_size(sizeof(struct prefix_cacheinfo));
6185 }
6186
inet6_fill_prefix(struct sk_buff * skb,struct inet6_dev * idev,struct prefix_info * pinfo,u32 portid,u32 seq,int event,unsigned int flags)6187 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6188 struct prefix_info *pinfo, u32 portid, u32 seq,
6189 int event, unsigned int flags)
6190 {
6191 struct prefixmsg *pmsg;
6192 struct nlmsghdr *nlh;
6193 struct prefix_cacheinfo ci;
6194
6195 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6196 if (!nlh)
6197 return -EMSGSIZE;
6198
6199 pmsg = nlmsg_data(nlh);
6200 pmsg->prefix_family = AF_INET6;
6201 pmsg->prefix_pad1 = 0;
6202 pmsg->prefix_pad2 = 0;
6203 pmsg->prefix_ifindex = idev->dev->ifindex;
6204 pmsg->prefix_len = pinfo->prefix_len;
6205 pmsg->prefix_type = pinfo->type;
6206 pmsg->prefix_pad3 = 0;
6207 pmsg->prefix_flags = pinfo->flags;
6208
6209 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6210 goto nla_put_failure;
6211 ci.preferred_time = ntohl(pinfo->prefered);
6212 ci.valid_time = ntohl(pinfo->valid);
6213 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6214 goto nla_put_failure;
6215 nlmsg_end(skb, nlh);
6216 return 0;
6217
6218 nla_put_failure:
6219 nlmsg_cancel(skb, nlh);
6220 return -EMSGSIZE;
6221 }
6222
inet6_prefix_notify(int event,struct inet6_dev * idev,struct prefix_info * pinfo)6223 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6224 struct prefix_info *pinfo)
6225 {
6226 struct sk_buff *skb;
6227 struct net *net = dev_net(idev->dev);
6228 int err = -ENOBUFS;
6229
6230 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6231 if (!skb)
6232 goto errout;
6233
6234 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6235 if (err < 0) {
6236 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6237 WARN_ON(err == -EMSGSIZE);
6238 kfree_skb(skb);
6239 goto errout;
6240 }
6241 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6242 return;
6243 errout:
6244 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6245 }
6246
__ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6247 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6248 {
6249 struct net *net = dev_net(ifp->idev->dev);
6250
6251 if (event)
6252 ASSERT_RTNL();
6253
6254 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6255
6256 switch (event) {
6257 case RTM_NEWADDR:
6258 /*
6259 * If the address was optimistic we inserted the route at the
6260 * start of our DAD process, so we don't need to do it again.
6261 * If the device was taken down in the middle of the DAD
6262 * cycle there is a race where we could get here without a
6263 * host route, so nothing to insert. That will be fixed when
6264 * the device is brought up.
6265 */
6266 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6267 ip6_ins_rt(net, ifp->rt);
6268 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6269 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6270 &ifp->addr, ifp->idev->dev->name);
6271 }
6272
6273 if (ifp->idev->cnf.forwarding)
6274 addrconf_join_anycast(ifp);
6275 if (!ipv6_addr_any(&ifp->peer_addr))
6276 addrconf_prefix_route(&ifp->peer_addr, 128,
6277 ifp->rt_priority, ifp->idev->dev,
6278 0, 0, GFP_ATOMIC);
6279 break;
6280 case RTM_DELADDR:
6281 if (ifp->idev->cnf.forwarding)
6282 addrconf_leave_anycast(ifp);
6283 addrconf_leave_solict(ifp->idev, &ifp->addr);
6284 if (!ipv6_addr_any(&ifp->peer_addr)) {
6285 struct fib6_info *rt;
6286
6287 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6288 ifp->idev->dev, 0, 0,
6289 false);
6290 if (rt)
6291 ip6_del_rt(net, rt, false);
6292 }
6293 if (ifp->rt) {
6294 ip6_del_rt(net, ifp->rt, false);
6295 ifp->rt = NULL;
6296 }
6297 rt_genid_bump_ipv6(net);
6298 break;
6299 }
6300 atomic_inc(&net->ipv6.dev_addr_genid);
6301 }
6302
ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6303 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6304 {
6305 if (likely(ifp->idev->dead == 0))
6306 __ipv6_ifa_notify(event, ifp);
6307 }
6308
6309 #ifdef CONFIG_SYSCTL
6310
addrconf_sysctl_forward(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6311 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,
6312 void *buffer, size_t *lenp, loff_t *ppos)
6313 {
6314 int *valp = ctl->data;
6315 int val = *valp;
6316 loff_t pos = *ppos;
6317 struct ctl_table lctl;
6318 int ret;
6319
6320 /*
6321 * ctl->data points to idev->cnf.forwarding, we should
6322 * not modify it until we get the rtnl lock.
6323 */
6324 lctl = *ctl;
6325 lctl.data = &val;
6326
6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6328
6329 if (write)
6330 ret = addrconf_fixup_forwarding(ctl, valp, val);
6331 if (ret)
6332 *ppos = pos;
6333 return ret;
6334 }
6335
addrconf_sysctl_mtu(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6336 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write,
6337 void *buffer, size_t *lenp, loff_t *ppos)
6338 {
6339 struct inet6_dev *idev = ctl->extra1;
6340 int min_mtu = IPV6_MIN_MTU;
6341 struct ctl_table lctl;
6342
6343 lctl = *ctl;
6344 lctl.extra1 = &min_mtu;
6345 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6346
6347 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6348 }
6349
dev_disable_change(struct inet6_dev * idev)6350 static void dev_disable_change(struct inet6_dev *idev)
6351 {
6352 struct netdev_notifier_info info;
6353
6354 if (!idev || !idev->dev)
6355 return;
6356
6357 netdev_notifier_info_init(&info, idev->dev);
6358 if (idev->cnf.disable_ipv6)
6359 addrconf_notify(NULL, NETDEV_DOWN, &info);
6360 else
6361 addrconf_notify(NULL, NETDEV_UP, &info);
6362 }
6363
addrconf_disable_change(struct net * net,__s32 newf)6364 static void addrconf_disable_change(struct net *net, __s32 newf)
6365 {
6366 struct net_device *dev;
6367 struct inet6_dev *idev;
6368
6369 for_each_netdev(net, dev) {
6370 idev = __in6_dev_get(dev);
6371 if (idev) {
6372 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6373
6374 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6375 if (changed)
6376 dev_disable_change(idev);
6377 }
6378 }
6379 }
6380
addrconf_disable_ipv6(const struct ctl_table * table,int * p,int newf)6381 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf)
6382 {
6383 struct net *net = (struct net *)table->extra2;
6384 int old;
6385
6386 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6387 WRITE_ONCE(*p, newf);
6388 return 0;
6389 }
6390
6391 if (!rtnl_trylock())
6392 return restart_syscall();
6393
6394 old = *p;
6395 WRITE_ONCE(*p, newf);
6396
6397 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6398 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6399 addrconf_disable_change(net, newf);
6400 } else if ((!newf) ^ (!old))
6401 dev_disable_change((struct inet6_dev *)table->extra1);
6402
6403 rtnl_unlock();
6404 return 0;
6405 }
6406
addrconf_sysctl_disable(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6407 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
6408 void *buffer, size_t *lenp, loff_t *ppos)
6409 {
6410 int *valp = ctl->data;
6411 int val = *valp;
6412 loff_t pos = *ppos;
6413 struct ctl_table lctl;
6414 int ret;
6415
6416 /*
6417 * ctl->data points to idev->cnf.disable_ipv6, we should
6418 * not modify it until we get the rtnl lock.
6419 */
6420 lctl = *ctl;
6421 lctl.data = &val;
6422
6423 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6424
6425 if (write)
6426 ret = addrconf_disable_ipv6(ctl, valp, val);
6427 if (ret)
6428 *ppos = pos;
6429 return ret;
6430 }
6431
addrconf_sysctl_proxy_ndp(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6432 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
6433 void *buffer, size_t *lenp, loff_t *ppos)
6434 {
6435 int *valp = ctl->data;
6436 int ret;
6437 int old, new;
6438
6439 old = *valp;
6440 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6441 new = *valp;
6442
6443 if (write && old != new) {
6444 struct net *net = ctl->extra2;
6445
6446 if (!rtnl_trylock())
6447 return restart_syscall();
6448
6449 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6450 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6451 NETCONFA_PROXY_NEIGH,
6452 NETCONFA_IFINDEX_DEFAULT,
6453 net->ipv6.devconf_dflt);
6454 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6455 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6456 NETCONFA_PROXY_NEIGH,
6457 NETCONFA_IFINDEX_ALL,
6458 net->ipv6.devconf_all);
6459 else {
6460 struct inet6_dev *idev = ctl->extra1;
6461
6462 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6463 NETCONFA_PROXY_NEIGH,
6464 idev->dev->ifindex,
6465 &idev->cnf);
6466 }
6467 rtnl_unlock();
6468 }
6469
6470 return ret;
6471 }
6472
addrconf_sysctl_addr_gen_mode(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6473 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write,
6474 void *buffer, size_t *lenp,
6475 loff_t *ppos)
6476 {
6477 int ret = 0;
6478 u32 new_val;
6479 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6480 struct net *net = (struct net *)ctl->extra2;
6481 struct ctl_table tmp = {
6482 .data = &new_val,
6483 .maxlen = sizeof(new_val),
6484 .mode = ctl->mode,
6485 };
6486
6487 if (!rtnl_trylock())
6488 return restart_syscall();
6489
6490 new_val = *((u32 *)ctl->data);
6491
6492 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6493 if (ret != 0)
6494 goto out;
6495
6496 if (write) {
6497 if (check_addr_gen_mode(new_val) < 0) {
6498 ret = -EINVAL;
6499 goto out;
6500 }
6501
6502 if (idev) {
6503 if (check_stable_privacy(idev, net, new_val) < 0) {
6504 ret = -EINVAL;
6505 goto out;
6506 }
6507
6508 if (idev->cnf.addr_gen_mode != new_val) {
6509 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6510 addrconf_init_auto_addrs(idev->dev);
6511 }
6512 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6513 struct net_device *dev;
6514
6515 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6516 for_each_netdev(net, dev) {
6517 idev = __in6_dev_get(dev);
6518 if (idev &&
6519 idev->cnf.addr_gen_mode != new_val) {
6520 WRITE_ONCE(idev->cnf.addr_gen_mode,
6521 new_val);
6522 addrconf_init_auto_addrs(idev->dev);
6523 }
6524 }
6525 }
6526
6527 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6528 }
6529
6530 out:
6531 rtnl_unlock();
6532
6533 return ret;
6534 }
6535
addrconf_sysctl_stable_secret(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6536 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write,
6537 void *buffer, size_t *lenp,
6538 loff_t *ppos)
6539 {
6540 int err;
6541 struct in6_addr addr;
6542 char str[IPV6_MAX_STRLEN];
6543 struct ctl_table lctl = *ctl;
6544 struct net *net = ctl->extra2;
6545 struct ipv6_stable_secret *secret = ctl->data;
6546
6547 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6548 return -EIO;
6549
6550 lctl.maxlen = IPV6_MAX_STRLEN;
6551 lctl.data = str;
6552
6553 if (!rtnl_trylock())
6554 return restart_syscall();
6555
6556 if (!write && !secret->initialized) {
6557 err = -EIO;
6558 goto out;
6559 }
6560
6561 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6562 if (err >= sizeof(str)) {
6563 err = -EIO;
6564 goto out;
6565 }
6566
6567 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6568 if (err || !write)
6569 goto out;
6570
6571 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6572 err = -EIO;
6573 goto out;
6574 }
6575
6576 secret->initialized = true;
6577 secret->secret = addr;
6578
6579 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6580 struct net_device *dev;
6581
6582 for_each_netdev(net, dev) {
6583 struct inet6_dev *idev = __in6_dev_get(dev);
6584
6585 if (idev) {
6586 WRITE_ONCE(idev->cnf.addr_gen_mode,
6587 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6588 }
6589 }
6590 } else {
6591 struct inet6_dev *idev = ctl->extra1;
6592
6593 WRITE_ONCE(idev->cnf.addr_gen_mode,
6594 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6595 }
6596
6597 out:
6598 rtnl_unlock();
6599
6600 return err;
6601 }
6602
6603 static
addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6604 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
6605 int write, void *buffer,
6606 size_t *lenp,
6607 loff_t *ppos)
6608 {
6609 int *valp = ctl->data;
6610 int val = *valp;
6611 loff_t pos = *ppos;
6612 struct ctl_table lctl;
6613 int ret;
6614
6615 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6616 * we should not modify it until we get the rtnl lock.
6617 */
6618 lctl = *ctl;
6619 lctl.data = &val;
6620
6621 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6622
6623 if (write)
6624 ret = addrconf_fixup_linkdown(ctl, valp, val);
6625 if (ret)
6626 *ppos = pos;
6627 return ret;
6628 }
6629
6630 static
addrconf_set_nopolicy(struct rt6_info * rt,int action)6631 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6632 {
6633 if (rt) {
6634 if (action)
6635 rt->dst.flags |= DST_NOPOLICY;
6636 else
6637 rt->dst.flags &= ~DST_NOPOLICY;
6638 }
6639 }
6640
6641 static
addrconf_disable_policy_idev(struct inet6_dev * idev,int val)6642 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6643 {
6644 struct inet6_ifaddr *ifa;
6645
6646 read_lock_bh(&idev->lock);
6647 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6648 spin_lock(&ifa->lock);
6649 if (ifa->rt) {
6650 /* host routes only use builtin fib6_nh */
6651 struct fib6_nh *nh = ifa->rt->fib6_nh;
6652 int cpu;
6653
6654 rcu_read_lock();
6655 ifa->rt->dst_nopolicy = val ? true : false;
6656 if (nh->rt6i_pcpu) {
6657 for_each_possible_cpu(cpu) {
6658 struct rt6_info **rtp;
6659
6660 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6661 addrconf_set_nopolicy(*rtp, val);
6662 }
6663 }
6664 rcu_read_unlock();
6665 }
6666 spin_unlock(&ifa->lock);
6667 }
6668 read_unlock_bh(&idev->lock);
6669 }
6670
6671 static
addrconf_disable_policy(const struct ctl_table * ctl,int * valp,int val)6672 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val)
6673 {
6674 struct net *net = (struct net *)ctl->extra2;
6675 struct inet6_dev *idev;
6676
6677 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6678 WRITE_ONCE(*valp, val);
6679 return 0;
6680 }
6681
6682 if (!rtnl_trylock())
6683 return restart_syscall();
6684
6685 WRITE_ONCE(*valp, val);
6686
6687 if (valp == &net->ipv6.devconf_all->disable_policy) {
6688 struct net_device *dev;
6689
6690 for_each_netdev(net, dev) {
6691 idev = __in6_dev_get(dev);
6692 if (idev)
6693 addrconf_disable_policy_idev(idev, val);
6694 }
6695 } else {
6696 idev = (struct inet6_dev *)ctl->extra1;
6697 addrconf_disable_policy_idev(idev, val);
6698 }
6699
6700 rtnl_unlock();
6701 return 0;
6702 }
6703
addrconf_sysctl_disable_policy(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6704 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write,
6705 void *buffer, size_t *lenp, loff_t *ppos)
6706 {
6707 int *valp = ctl->data;
6708 int val = *valp;
6709 loff_t pos = *ppos;
6710 struct ctl_table lctl;
6711 int ret;
6712
6713 lctl = *ctl;
6714 lctl.data = &val;
6715 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6716
6717 if (write && (*valp != val))
6718 ret = addrconf_disable_policy(ctl, valp, val);
6719
6720 if (ret)
6721 *ppos = pos;
6722
6723 return ret;
6724 }
6725
6726 static int minus_one = -1;
6727 static const int two_five_five = 255;
6728 static u32 ioam6_if_id_max = U16_MAX;
6729
6730 static const struct ctl_table addrconf_sysctl[] = {
6731 {
6732 .procname = "forwarding",
6733 .data = &ipv6_devconf.forwarding,
6734 .maxlen = sizeof(int),
6735 .mode = 0644,
6736 .proc_handler = addrconf_sysctl_forward,
6737 },
6738 {
6739 .procname = "hop_limit",
6740 .data = &ipv6_devconf.hop_limit,
6741 .maxlen = sizeof(int),
6742 .mode = 0644,
6743 .proc_handler = proc_dointvec_minmax,
6744 .extra1 = (void *)SYSCTL_ONE,
6745 .extra2 = (void *)&two_five_five,
6746 },
6747 {
6748 .procname = "mtu",
6749 .data = &ipv6_devconf.mtu6,
6750 .maxlen = sizeof(int),
6751 .mode = 0644,
6752 .proc_handler = addrconf_sysctl_mtu,
6753 },
6754 {
6755 .procname = "accept_ra",
6756 .data = &ipv6_devconf.accept_ra,
6757 .maxlen = sizeof(int),
6758 .mode = 0644,
6759 .proc_handler = proc_dointvec,
6760 },
6761 {
6762 .procname = "accept_redirects",
6763 .data = &ipv6_devconf.accept_redirects,
6764 .maxlen = sizeof(int),
6765 .mode = 0644,
6766 .proc_handler = proc_dointvec,
6767 },
6768 {
6769 .procname = "autoconf",
6770 .data = &ipv6_devconf.autoconf,
6771 .maxlen = sizeof(int),
6772 .mode = 0644,
6773 .proc_handler = proc_dointvec,
6774 },
6775 {
6776 .procname = "dad_transmits",
6777 .data = &ipv6_devconf.dad_transmits,
6778 .maxlen = sizeof(int),
6779 .mode = 0644,
6780 .proc_handler = proc_dointvec,
6781 },
6782 {
6783 .procname = "router_solicitations",
6784 .data = &ipv6_devconf.rtr_solicits,
6785 .maxlen = sizeof(int),
6786 .mode = 0644,
6787 .proc_handler = proc_dointvec_minmax,
6788 .extra1 = &minus_one,
6789 },
6790 {
6791 .procname = "router_solicitation_interval",
6792 .data = &ipv6_devconf.rtr_solicit_interval,
6793 .maxlen = sizeof(int),
6794 .mode = 0644,
6795 .proc_handler = proc_dointvec_jiffies,
6796 },
6797 {
6798 .procname = "router_solicitation_max_interval",
6799 .data = &ipv6_devconf.rtr_solicit_max_interval,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = proc_dointvec_jiffies,
6803 },
6804 {
6805 .procname = "router_solicitation_delay",
6806 .data = &ipv6_devconf.rtr_solicit_delay,
6807 .maxlen = sizeof(int),
6808 .mode = 0644,
6809 .proc_handler = proc_dointvec_jiffies,
6810 },
6811 {
6812 .procname = "force_mld_version",
6813 .data = &ipv6_devconf.force_mld_version,
6814 .maxlen = sizeof(int),
6815 .mode = 0644,
6816 .proc_handler = proc_dointvec,
6817 },
6818 {
6819 .procname = "mldv1_unsolicited_report_interval",
6820 .data =
6821 &ipv6_devconf.mldv1_unsolicited_report_interval,
6822 .maxlen = sizeof(int),
6823 .mode = 0644,
6824 .proc_handler = proc_dointvec_ms_jiffies,
6825 },
6826 {
6827 .procname = "mldv2_unsolicited_report_interval",
6828 .data =
6829 &ipv6_devconf.mldv2_unsolicited_report_interval,
6830 .maxlen = sizeof(int),
6831 .mode = 0644,
6832 .proc_handler = proc_dointvec_ms_jiffies,
6833 },
6834 {
6835 .procname = "use_tempaddr",
6836 .data = &ipv6_devconf.use_tempaddr,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = proc_dointvec,
6840 },
6841 {
6842 .procname = "temp_valid_lft",
6843 .data = &ipv6_devconf.temp_valid_lft,
6844 .maxlen = sizeof(int),
6845 .mode = 0644,
6846 .proc_handler = proc_dointvec,
6847 },
6848 {
6849 .procname = "temp_prefered_lft",
6850 .data = &ipv6_devconf.temp_prefered_lft,
6851 .maxlen = sizeof(int),
6852 .mode = 0644,
6853 .proc_handler = proc_dointvec,
6854 },
6855 {
6856 .procname = "regen_min_advance",
6857 .data = &ipv6_devconf.regen_min_advance,
6858 .maxlen = sizeof(int),
6859 .mode = 0644,
6860 .proc_handler = proc_dointvec,
6861 },
6862 {
6863 .procname = "regen_max_retry",
6864 .data = &ipv6_devconf.regen_max_retry,
6865 .maxlen = sizeof(int),
6866 .mode = 0644,
6867 .proc_handler = proc_dointvec,
6868 },
6869 {
6870 .procname = "max_desync_factor",
6871 .data = &ipv6_devconf.max_desync_factor,
6872 .maxlen = sizeof(int),
6873 .mode = 0644,
6874 .proc_handler = proc_dointvec,
6875 },
6876 {
6877 .procname = "max_addresses",
6878 .data = &ipv6_devconf.max_addresses,
6879 .maxlen = sizeof(int),
6880 .mode = 0644,
6881 .proc_handler = proc_dointvec,
6882 },
6883 {
6884 .procname = "accept_ra_defrtr",
6885 .data = &ipv6_devconf.accept_ra_defrtr,
6886 .maxlen = sizeof(int),
6887 .mode = 0644,
6888 .proc_handler = proc_dointvec,
6889 },
6890 {
6891 .procname = "ra_defrtr_metric",
6892 .data = &ipv6_devconf.ra_defrtr_metric,
6893 .maxlen = sizeof(u32),
6894 .mode = 0644,
6895 .proc_handler = proc_douintvec_minmax,
6896 .extra1 = (void *)SYSCTL_ONE,
6897 },
6898 {
6899 .procname = "accept_ra_min_hop_limit",
6900 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6901 .maxlen = sizeof(int),
6902 .mode = 0644,
6903 .proc_handler = proc_dointvec,
6904 },
6905 {
6906 .procname = "accept_ra_min_lft",
6907 .data = &ipv6_devconf.accept_ra_min_lft,
6908 .maxlen = sizeof(int),
6909 .mode = 0644,
6910 .proc_handler = proc_dointvec,
6911 },
6912 {
6913 .procname = "accept_ra_pinfo",
6914 .data = &ipv6_devconf.accept_ra_pinfo,
6915 .maxlen = sizeof(int),
6916 .mode = 0644,
6917 .proc_handler = proc_dointvec,
6918 },
6919 {
6920 .procname = "ra_honor_pio_life",
6921 .data = &ipv6_devconf.ra_honor_pio_life,
6922 .maxlen = sizeof(u8),
6923 .mode = 0644,
6924 .proc_handler = proc_dou8vec_minmax,
6925 .extra1 = SYSCTL_ZERO,
6926 .extra2 = SYSCTL_ONE,
6927 },
6928 {
6929 .procname = "ra_honor_pio_pflag",
6930 .data = &ipv6_devconf.ra_honor_pio_pflag,
6931 .maxlen = sizeof(u8),
6932 .mode = 0644,
6933 .proc_handler = proc_dou8vec_minmax,
6934 .extra1 = SYSCTL_ZERO,
6935 .extra2 = SYSCTL_ONE,
6936 },
6937 #ifdef CONFIG_IPV6_ROUTER_PREF
6938 {
6939 .procname = "accept_ra_rtr_pref",
6940 .data = &ipv6_devconf.accept_ra_rtr_pref,
6941 .maxlen = sizeof(int),
6942 .mode = 0644,
6943 .proc_handler = proc_dointvec,
6944 },
6945 {
6946 .procname = "router_probe_interval",
6947 .data = &ipv6_devconf.rtr_probe_interval,
6948 .maxlen = sizeof(int),
6949 .mode = 0644,
6950 .proc_handler = proc_dointvec_jiffies,
6951 },
6952 #ifdef CONFIG_IPV6_ROUTE_INFO
6953 {
6954 .procname = "accept_ra_rt_info_min_plen",
6955 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6956 .maxlen = sizeof(int),
6957 .mode = 0644,
6958 .proc_handler = proc_dointvec,
6959 },
6960 {
6961 .procname = "accept_ra_rt_info_max_plen",
6962 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6963 .maxlen = sizeof(int),
6964 .mode = 0644,
6965 .proc_handler = proc_dointvec,
6966 },
6967 #endif
6968 #endif
6969 {
6970 .procname = "proxy_ndp",
6971 .data = &ipv6_devconf.proxy_ndp,
6972 .maxlen = sizeof(int),
6973 .mode = 0644,
6974 .proc_handler = addrconf_sysctl_proxy_ndp,
6975 },
6976 {
6977 .procname = "accept_source_route",
6978 .data = &ipv6_devconf.accept_source_route,
6979 .maxlen = sizeof(int),
6980 .mode = 0644,
6981 .proc_handler = proc_dointvec,
6982 },
6983 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6984 {
6985 .procname = "optimistic_dad",
6986 .data = &ipv6_devconf.optimistic_dad,
6987 .maxlen = sizeof(int),
6988 .mode = 0644,
6989 .proc_handler = proc_dointvec,
6990 },
6991 {
6992 .procname = "use_optimistic",
6993 .data = &ipv6_devconf.use_optimistic,
6994 .maxlen = sizeof(int),
6995 .mode = 0644,
6996 .proc_handler = proc_dointvec,
6997 },
6998 #endif
6999 #ifdef CONFIG_IPV6_MROUTE
7000 {
7001 .procname = "mc_forwarding",
7002 .data = &ipv6_devconf.mc_forwarding,
7003 .maxlen = sizeof(int),
7004 .mode = 0444,
7005 .proc_handler = proc_dointvec,
7006 },
7007 #endif
7008 {
7009 .procname = "disable_ipv6",
7010 .data = &ipv6_devconf.disable_ipv6,
7011 .maxlen = sizeof(int),
7012 .mode = 0644,
7013 .proc_handler = addrconf_sysctl_disable,
7014 },
7015 {
7016 .procname = "accept_dad",
7017 .data = &ipv6_devconf.accept_dad,
7018 .maxlen = sizeof(int),
7019 .mode = 0644,
7020 .proc_handler = proc_dointvec,
7021 },
7022 {
7023 .procname = "force_tllao",
7024 .data = &ipv6_devconf.force_tllao,
7025 .maxlen = sizeof(int),
7026 .mode = 0644,
7027 .proc_handler = proc_dointvec
7028 },
7029 {
7030 .procname = "ndisc_notify",
7031 .data = &ipv6_devconf.ndisc_notify,
7032 .maxlen = sizeof(int),
7033 .mode = 0644,
7034 .proc_handler = proc_dointvec
7035 },
7036 {
7037 .procname = "suppress_frag_ndisc",
7038 .data = &ipv6_devconf.suppress_frag_ndisc,
7039 .maxlen = sizeof(int),
7040 .mode = 0644,
7041 .proc_handler = proc_dointvec
7042 },
7043 {
7044 .procname = "accept_ra_from_local",
7045 .data = &ipv6_devconf.accept_ra_from_local,
7046 .maxlen = sizeof(int),
7047 .mode = 0644,
7048 .proc_handler = proc_dointvec,
7049 },
7050 {
7051 .procname = "accept_ra_mtu",
7052 .data = &ipv6_devconf.accept_ra_mtu,
7053 .maxlen = sizeof(int),
7054 .mode = 0644,
7055 .proc_handler = proc_dointvec,
7056 },
7057 {
7058 .procname = "stable_secret",
7059 .data = &ipv6_devconf.stable_secret,
7060 .maxlen = IPV6_MAX_STRLEN,
7061 .mode = 0600,
7062 .proc_handler = addrconf_sysctl_stable_secret,
7063 },
7064 {
7065 .procname = "use_oif_addrs_only",
7066 .data = &ipv6_devconf.use_oif_addrs_only,
7067 .maxlen = sizeof(int),
7068 .mode = 0644,
7069 .proc_handler = proc_dointvec,
7070 },
7071 {
7072 .procname = "ignore_routes_with_linkdown",
7073 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7074 .maxlen = sizeof(int),
7075 .mode = 0644,
7076 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7077 },
7078 {
7079 .procname = "drop_unicast_in_l2_multicast",
7080 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7081 .maxlen = sizeof(int),
7082 .mode = 0644,
7083 .proc_handler = proc_dointvec,
7084 },
7085 {
7086 .procname = "drop_unsolicited_na",
7087 .data = &ipv6_devconf.drop_unsolicited_na,
7088 .maxlen = sizeof(int),
7089 .mode = 0644,
7090 .proc_handler = proc_dointvec,
7091 },
7092 {
7093 .procname = "keep_addr_on_down",
7094 .data = &ipv6_devconf.keep_addr_on_down,
7095 .maxlen = sizeof(int),
7096 .mode = 0644,
7097 .proc_handler = proc_dointvec,
7098
7099 },
7100 {
7101 .procname = "seg6_enabled",
7102 .data = &ipv6_devconf.seg6_enabled,
7103 .maxlen = sizeof(int),
7104 .mode = 0644,
7105 .proc_handler = proc_dointvec,
7106 },
7107 #ifdef CONFIG_IPV6_SEG6_HMAC
7108 {
7109 .procname = "seg6_require_hmac",
7110 .data = &ipv6_devconf.seg6_require_hmac,
7111 .maxlen = sizeof(int),
7112 .mode = 0644,
7113 .proc_handler = proc_dointvec,
7114 },
7115 #endif
7116 {
7117 .procname = "enhanced_dad",
7118 .data = &ipv6_devconf.enhanced_dad,
7119 .maxlen = sizeof(int),
7120 .mode = 0644,
7121 .proc_handler = proc_dointvec,
7122 },
7123 {
7124 .procname = "addr_gen_mode",
7125 .data = &ipv6_devconf.addr_gen_mode,
7126 .maxlen = sizeof(int),
7127 .mode = 0644,
7128 .proc_handler = addrconf_sysctl_addr_gen_mode,
7129 },
7130 {
7131 .procname = "disable_policy",
7132 .data = &ipv6_devconf.disable_policy,
7133 .maxlen = sizeof(int),
7134 .mode = 0644,
7135 .proc_handler = addrconf_sysctl_disable_policy,
7136 },
7137 {
7138 .procname = "ndisc_tclass",
7139 .data = &ipv6_devconf.ndisc_tclass,
7140 .maxlen = sizeof(int),
7141 .mode = 0644,
7142 .proc_handler = proc_dointvec_minmax,
7143 .extra1 = (void *)SYSCTL_ZERO,
7144 .extra2 = (void *)&two_five_five,
7145 },
7146 {
7147 .procname = "rpl_seg_enabled",
7148 .data = &ipv6_devconf.rpl_seg_enabled,
7149 .maxlen = sizeof(int),
7150 .mode = 0644,
7151 .proc_handler = proc_dointvec,
7152 },
7153 {
7154 .procname = "ioam6_enabled",
7155 .data = &ipv6_devconf.ioam6_enabled,
7156 .maxlen = sizeof(u8),
7157 .mode = 0644,
7158 .proc_handler = proc_dou8vec_minmax,
7159 .extra1 = (void *)SYSCTL_ZERO,
7160 .extra2 = (void *)SYSCTL_ONE,
7161 },
7162 {
7163 .procname = "ioam6_id",
7164 .data = &ipv6_devconf.ioam6_id,
7165 .maxlen = sizeof(u32),
7166 .mode = 0644,
7167 .proc_handler = proc_douintvec_minmax,
7168 .extra1 = (void *)SYSCTL_ZERO,
7169 .extra2 = (void *)&ioam6_if_id_max,
7170 },
7171 {
7172 .procname = "ioam6_id_wide",
7173 .data = &ipv6_devconf.ioam6_id_wide,
7174 .maxlen = sizeof(u32),
7175 .mode = 0644,
7176 .proc_handler = proc_douintvec,
7177 },
7178 {
7179 .procname = "ndisc_evict_nocarrier",
7180 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7181 .maxlen = sizeof(u8),
7182 .mode = 0644,
7183 .proc_handler = proc_dou8vec_minmax,
7184 .extra1 = (void *)SYSCTL_ZERO,
7185 .extra2 = (void *)SYSCTL_ONE,
7186 },
7187 {
7188 .procname = "accept_untracked_na",
7189 .data = &ipv6_devconf.accept_untracked_na,
7190 .maxlen = sizeof(int),
7191 .mode = 0644,
7192 .proc_handler = proc_dointvec_minmax,
7193 .extra1 = SYSCTL_ZERO,
7194 .extra2 = SYSCTL_TWO,
7195 },
7196 };
7197
__addrconf_sysctl_register(struct net * net,char * dev_name,struct inet6_dev * idev,struct ipv6_devconf * p)7198 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7199 struct inet6_dev *idev, struct ipv6_devconf *p)
7200 {
7201 size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7202 int i, ifindex;
7203 struct ctl_table *table;
7204 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7205
7206 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7207 if (!table)
7208 goto out;
7209
7210 for (i = 0; i < table_size; i++) {
7211 table[i].data += (char *)p - (char *)&ipv6_devconf;
7212 /* If one of these is already set, then it is not safe to
7213 * overwrite either of them: this makes proc_dointvec_minmax
7214 * usable.
7215 */
7216 if (!table[i].extra1 && !table[i].extra2) {
7217 table[i].extra1 = idev; /* embedded; no ref */
7218 table[i].extra2 = net;
7219 }
7220 }
7221
7222 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7223
7224 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7225 table_size);
7226 if (!p->sysctl_header)
7227 goto free;
7228
7229 if (!strcmp(dev_name, "all"))
7230 ifindex = NETCONFA_IFINDEX_ALL;
7231 else if (!strcmp(dev_name, "default"))
7232 ifindex = NETCONFA_IFINDEX_DEFAULT;
7233 else
7234 ifindex = idev->dev->ifindex;
7235 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7236 ifindex, p);
7237 return 0;
7238
7239 free:
7240 kfree(table);
7241 out:
7242 return -ENOBUFS;
7243 }
7244
__addrconf_sysctl_unregister(struct net * net,struct ipv6_devconf * p,int ifindex)7245 static void __addrconf_sysctl_unregister(struct net *net,
7246 struct ipv6_devconf *p, int ifindex)
7247 {
7248 const struct ctl_table *table;
7249
7250 if (!p->sysctl_header)
7251 return;
7252
7253 table = p->sysctl_header->ctl_table_arg;
7254 unregister_net_sysctl_table(p->sysctl_header);
7255 p->sysctl_header = NULL;
7256 kfree(table);
7257
7258 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7259 }
7260
addrconf_sysctl_register(struct inet6_dev * idev)7261 static int addrconf_sysctl_register(struct inet6_dev *idev)
7262 {
7263 int err;
7264
7265 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7266 return -EINVAL;
7267
7268 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7269 &ndisc_ifinfo_sysctl_change);
7270 if (err)
7271 return err;
7272 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7273 idev, &idev->cnf);
7274 if (err)
7275 neigh_sysctl_unregister(idev->nd_parms);
7276
7277 return err;
7278 }
7279
addrconf_sysctl_unregister(struct inet6_dev * idev)7280 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7281 {
7282 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7283 idev->dev->ifindex);
7284 neigh_sysctl_unregister(idev->nd_parms);
7285 }
7286
7287
7288 #endif
7289
addrconf_init_net(struct net * net)7290 static int __net_init addrconf_init_net(struct net *net)
7291 {
7292 int err = -ENOMEM;
7293 struct ipv6_devconf *all, *dflt;
7294
7295 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7296 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7297 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7298 sizeof(struct hlist_head),
7299 GFP_KERNEL);
7300 if (!net->ipv6.inet6_addr_lst)
7301 goto err_alloc_addr;
7302
7303 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7304 if (!all)
7305 goto err_alloc_all;
7306
7307 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7308 if (!dflt)
7309 goto err_alloc_dflt;
7310
7311 if (!net_eq(net, &init_net)) {
7312 switch (net_inherit_devconf()) {
7313 case 1: /* copy from init_net */
7314 memcpy(all, init_net.ipv6.devconf_all,
7315 sizeof(ipv6_devconf));
7316 memcpy(dflt, init_net.ipv6.devconf_dflt,
7317 sizeof(ipv6_devconf_dflt));
7318 break;
7319 case 3: /* copy from the current netns */
7320 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7321 sizeof(ipv6_devconf));
7322 memcpy(dflt,
7323 current->nsproxy->net_ns->ipv6.devconf_dflt,
7324 sizeof(ipv6_devconf_dflt));
7325 break;
7326 case 0:
7327 case 2:
7328 /* use compiled values */
7329 break;
7330 }
7331 }
7332
7333 /* these will be inherited by all namespaces */
7334 dflt->autoconf = ipv6_defaults.autoconf;
7335 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7336
7337 dflt->stable_secret.initialized = false;
7338 all->stable_secret.initialized = false;
7339
7340 net->ipv6.devconf_all = all;
7341 net->ipv6.devconf_dflt = dflt;
7342
7343 #ifdef CONFIG_SYSCTL
7344 err = __addrconf_sysctl_register(net, "all", NULL, all);
7345 if (err < 0)
7346 goto err_reg_all;
7347
7348 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7349 if (err < 0)
7350 goto err_reg_dflt;
7351 #endif
7352 return 0;
7353
7354 #ifdef CONFIG_SYSCTL
7355 err_reg_dflt:
7356 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7357 err_reg_all:
7358 kfree(dflt);
7359 net->ipv6.devconf_dflt = NULL;
7360 #endif
7361 err_alloc_dflt:
7362 kfree(all);
7363 net->ipv6.devconf_all = NULL;
7364 err_alloc_all:
7365 kfree(net->ipv6.inet6_addr_lst);
7366 err_alloc_addr:
7367 return err;
7368 }
7369
addrconf_exit_net(struct net * net)7370 static void __net_exit addrconf_exit_net(struct net *net)
7371 {
7372 int i;
7373
7374 #ifdef CONFIG_SYSCTL
7375 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7376 NETCONFA_IFINDEX_DEFAULT);
7377 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7378 NETCONFA_IFINDEX_ALL);
7379 #endif
7380 kfree(net->ipv6.devconf_dflt);
7381 net->ipv6.devconf_dflt = NULL;
7382 kfree(net->ipv6.devconf_all);
7383 net->ipv6.devconf_all = NULL;
7384
7385 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7386 /*
7387 * Check hash table, then free it.
7388 */
7389 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7390 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7391
7392 kfree(net->ipv6.inet6_addr_lst);
7393 net->ipv6.inet6_addr_lst = NULL;
7394 }
7395
7396 static struct pernet_operations addrconf_ops = {
7397 .init = addrconf_init_net,
7398 .exit = addrconf_exit_net,
7399 };
7400
7401 static struct rtnl_af_ops inet6_ops __read_mostly = {
7402 .family = AF_INET6,
7403 .fill_link_af = inet6_fill_link_af,
7404 .get_link_af_size = inet6_get_link_af_size,
7405 .validate_link_af = inet6_validate_link_af,
7406 .set_link_af = inet6_set_link_af,
7407 };
7408
7409 /*
7410 * Init / cleanup code
7411 */
7412
addrconf_init(void)7413 int __init addrconf_init(void)
7414 {
7415 struct inet6_dev *idev;
7416 int err;
7417
7418 err = ipv6_addr_label_init();
7419 if (err < 0) {
7420 pr_crit("%s: cannot initialize default policy table: %d\n",
7421 __func__, err);
7422 goto out;
7423 }
7424
7425 err = register_pernet_subsys(&addrconf_ops);
7426 if (err < 0)
7427 goto out_addrlabel;
7428
7429 /* All works using addrconf_wq need to lock rtnl. */
7430 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7431 if (!addrconf_wq) {
7432 err = -ENOMEM;
7433 goto out_nowq;
7434 }
7435
7436 rtnl_lock();
7437 idev = ipv6_add_dev(blackhole_netdev);
7438 rtnl_unlock();
7439 if (IS_ERR(idev)) {
7440 err = PTR_ERR(idev);
7441 goto errlo;
7442 }
7443
7444 ip6_route_init_special_entries();
7445
7446 register_netdevice_notifier(&ipv6_dev_notf);
7447
7448 addrconf_verify(&init_net);
7449
7450 rtnl_af_register(&inet6_ops);
7451
7452 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7453 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED);
7454 if (err < 0)
7455 goto errout;
7456
7457 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7458 inet6_rtm_newaddr, NULL, 0);
7459 if (err < 0)
7460 goto errout;
7461 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7462 inet6_rtm_deladdr, NULL, 0);
7463 if (err < 0)
7464 goto errout;
7465 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7466 inet6_rtm_getaddr, inet6_dump_ifaddr,
7467 RTNL_FLAG_DOIT_UNLOCKED |
7468 RTNL_FLAG_DUMP_UNLOCKED);
7469 if (err < 0)
7470 goto errout;
7471 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7472 NULL, inet6_dump_ifmcaddr,
7473 RTNL_FLAG_DUMP_UNLOCKED);
7474 if (err < 0)
7475 goto errout;
7476 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7477 NULL, inet6_dump_ifacaddr,
7478 RTNL_FLAG_DUMP_UNLOCKED);
7479 if (err < 0)
7480 goto errout;
7481 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7482 inet6_netconf_get_devconf,
7483 inet6_netconf_dump_devconf,
7484 RTNL_FLAG_DOIT_UNLOCKED |
7485 RTNL_FLAG_DUMP_UNLOCKED);
7486 if (err < 0)
7487 goto errout;
7488 err = ipv6_addr_label_rtnl_register();
7489 if (err < 0)
7490 goto errout;
7491
7492 return 0;
7493 errout:
7494 rtnl_unregister_all(PF_INET6);
7495 rtnl_af_unregister(&inet6_ops);
7496 unregister_netdevice_notifier(&ipv6_dev_notf);
7497 errlo:
7498 destroy_workqueue(addrconf_wq);
7499 out_nowq:
7500 unregister_pernet_subsys(&addrconf_ops);
7501 out_addrlabel:
7502 ipv6_addr_label_cleanup();
7503 out:
7504 return err;
7505 }
7506
addrconf_cleanup(void)7507 void addrconf_cleanup(void)
7508 {
7509 struct net_device *dev;
7510
7511 unregister_netdevice_notifier(&ipv6_dev_notf);
7512 unregister_pernet_subsys(&addrconf_ops);
7513 ipv6_addr_label_cleanup();
7514
7515 rtnl_af_unregister(&inet6_ops);
7516
7517 rtnl_lock();
7518
7519 /* clean dev list */
7520 for_each_netdev(&init_net, dev) {
7521 if (__in6_dev_get(dev) == NULL)
7522 continue;
7523 addrconf_ifdown(dev, true);
7524 }
7525 addrconf_ifdown(init_net.loopback_dev, true);
7526
7527 rtnl_unlock();
7528
7529 destroy_workqueue(addrconf_wq);
7530 }
7531