addrconf.c source code [Linux/net/ipv6/addrconf.c]

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 <net/netdev_lock.h>
84	#include <linux/if_tunnel.h>
85	#include <linux/rtnetlink.h>
86	#include <linux/netconf.h>
87	#include <linux/random.h>
88	#include <linux/uaccess.h>
89	#include <linux/unaligned.h>
90
91	#include <linux/proc_fs.h>
92	#include <linux/seq_file.h>
93	#include <linux/export.h>
94	#include <linux/ioam6.h>
95
96	#define IPV6_MAX_STRLEN \
97	sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
98
99	static inline u32 cstamp_delta(unsigned long cstamp)
100	{
101	return (cstamp - INITIAL_JIFFIES) * `100UL` / HZ;
102	}
103
104	static inline s32 rfc3315_s14_backoff_init(s32 irt)
105	{
106	/ multiply 'initial retransmission time' by 0.9 .. 1.1 /
107	u64 tmp = get_random_u32_inclusive(floor: `900000`, ceil: `1100000`) * (u64)irt;
108	do_div(tmp, `1000000`);
109	return (s32)tmp;
110	}
111
112	static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
113	{
114	/ multiply 'retransmission timeout' by 1.9 .. 2.1 /
115	u64 tmp = get_random_u32_inclusive(floor: `1900000`, ceil: `2100000`) * (u64)rt;
116	do_div(tmp, `1000000`);
117	if ((s32)tmp > mrt) {
118	/ multiply 'maximum retransmission time' by 0.9 .. 1.1 /
119	tmp = get_random_u32_inclusive(floor: `900000`, ceil: `1100000`) * (u64)mrt;
120	do_div(tmp, `1000000`);
121	}
122	return (s32)tmp;
123	}
124
125	#ifdef CONFIG_SYSCTL
126	static int addrconf_sysctl_register(struct inet6_dev *idev);
127	static void addrconf_sysctl_unregister(struct inet6_dev *idev);
128	#else
129	static inline int addrconf_sysctl_register(struct inet6_dev *idev)
130	{
131	return `0`;
132	}
133
134	static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
135	{
136	}
137	#endif
138
139	static void ipv6_gen_rnd_iid(struct in6_addr *addr);
140
141	static int ipv6_generate_eui64(u8 eui, struct* net_device *dev);
142	static int ipv6_count_addresses(const struct inet6_dev *idev);
143	static int ipv6_generate_stable_address(struct in6_addr *addr,
144	u8 dad_count,
145	const struct inet6_dev *idev);
146
147	#define IN6_ADDR_HSIZE_SHIFT 8
148	#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149
150	static void addrconf_verify(struct net *net);
151	static void addrconf_verify_rtnl(struct net *net);
152
153	static struct workqueue_struct *addrconf_wq;
154
155	static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
156	static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
157
158	static void addrconf_type_change(struct net_device *dev,
159	unsigned long event);
160	static int addrconf_ifdown(struct net_device *dev, bool unregister);
161
162	static struct fib6_info addrconf_get_prefix_route(const* struct in6_addr *pfx,
163	int plen,
164	const struct net_device *dev,
165	u32 flags, u32 noflags,
166	bool no_gw);
167
168	static void addrconf_dad_start(struct inet6_ifaddr *ifp);
169	static void addrconf_dad_work(struct work_struct *w);
170	static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
171	bool send_na);
172	static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
173	static void addrconf_rs_timer(struct timer_list *t);
174	static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175	static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
176
177	static void inet6_prefix_notify(int event, struct inet6_dev *idev,
178	struct prefix_info *pinfo);
179
180	static struct ipv6_devconf ipv6_devconf __read_mostly = {
181	.forwarding = `0`,
182	.hop_limit = IPV6_DEFAULT_HOPLIMIT,
183	.mtu6 = IPV6_MIN_MTU,
184	.accept_ra = `1`,
185	.accept_redirects = `1`,
186	.autoconf = `1`,
187	.force_mld_version = `0`,
188	.mldv1_unsolicited_report_interval = `10` * HZ,
189	.mldv2_unsolicited_report_interval = HZ,
190	.dad_transmits = `1`,
191	.rtr_solicits = MAX_RTR_SOLICITATIONS,
192	.rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
193	.rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
194	.rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
195	.use_tempaddr = `0`,
196	.temp_valid_lft = TEMP_VALID_LIFETIME,
197	.temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
198	.regen_min_advance = REGEN_MIN_ADVANCE,
199	.regen_max_retry = REGEN_MAX_RETRY,
200	.max_desync_factor = MAX_DESYNC_FACTOR,
201	.max_addresses = IPV6_MAX_ADDRESSES,
202	.accept_ra_defrtr = `1`,
203	.ra_defrtr_metric = IP6_RT_PRIO_USER,
204	.accept_ra_from_local = `0`,
205	.accept_ra_min_hop_limit= `1`,
206	.accept_ra_min_lft = `0`,
207	.accept_ra_pinfo = `1`,
208	#ifdef CONFIG_IPV6_ROUTER_PREF
209	.accept_ra_rtr_pref = `1`,
210	.rtr_probe_interval = `60` * HZ,
211	#ifdef CONFIG_IPV6_ROUTE_INFO
212	.accept_ra_rt_info_min_plen = `0`,
213	.accept_ra_rt_info_max_plen = `0`,
214	#endif
215	#endif
216	.proxy_ndp = `0`,
217	.accept_source_route = `0`, / we do not accept RH0 by default. /
218	.disable_ipv6 = `0`,
219	.accept_dad = `0`,
220	.suppress_frag_ndisc = `1`,
221	.accept_ra_mtu = `1`,
222	.stable_secret = {
223	.initialized = false,
224	},
225	.use_oif_addrs_only = `0`,
226	.ignore_routes_with_linkdown = `0`,
227	.keep_addr_on_down = `0`,
228	.seg6_enabled = `0`,
229	#ifdef CONFIG_IPV6_SEG6_HMAC
230	.seg6_require_hmac = `0`,
231	#endif
232	.enhanced_dad = `1`,
233	.addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
234	.disable_policy = `0`,
235	.rpl_seg_enabled = `0`,
236	.ioam6_enabled = `0`,
237	.ioam6_id = IOAM6_DEFAULT_IF_ID,
238	.ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
239	.ndisc_evict_nocarrier = `1`,
240	.ra_honor_pio_life = `0`,
241	.ra_honor_pio_pflag = `0`,
242	.force_forwarding = `0`,
243	};
244
245	static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
246	.forwarding = `0`,
247	.hop_limit = IPV6_DEFAULT_HOPLIMIT,
248	.mtu6 = IPV6_MIN_MTU,
249	.accept_ra = `1`,
250	.accept_redirects = `1`,
251	.autoconf = `1`,
252	.force_mld_version = `0`,
253	.mldv1_unsolicited_report_interval = `10` * HZ,
254	.mldv2_unsolicited_report_interval = HZ,
255	.dad_transmits = `1`,
256	.rtr_solicits = MAX_RTR_SOLICITATIONS,
257	.rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
258	.rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
259	.rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
260	.use_tempaddr = `0`,
261	.temp_valid_lft = TEMP_VALID_LIFETIME,
262	.temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
263	.regen_min_advance = REGEN_MIN_ADVANCE,
264	.regen_max_retry = REGEN_MAX_RETRY,
265	.max_desync_factor = MAX_DESYNC_FACTOR,
266	.max_addresses = IPV6_MAX_ADDRESSES,
267	.accept_ra_defrtr = `1`,
268	.ra_defrtr_metric = IP6_RT_PRIO_USER,
269	.accept_ra_from_local = `0`,
270	.accept_ra_min_hop_limit= `1`,
271	.accept_ra_min_lft = `0`,
272	.accept_ra_pinfo = `1`,
273	#ifdef CONFIG_IPV6_ROUTER_PREF
274	.accept_ra_rtr_pref = `1`,
275	.rtr_probe_interval = `60` * HZ,
276	#ifdef CONFIG_IPV6_ROUTE_INFO
277	.accept_ra_rt_info_min_plen = `0`,
278	.accept_ra_rt_info_max_plen = `0`,
279	#endif
280	#endif
281	.proxy_ndp = `0`,
282	.accept_source_route = `0`, / we do not accept RH0 by default. /
283	.disable_ipv6 = `0`,
284	.accept_dad = `1`,
285	.suppress_frag_ndisc = `1`,
286	.accept_ra_mtu = `1`,
287	.stable_secret = {
288	.initialized = false,
289	},
290	.use_oif_addrs_only = `0`,
291	.ignore_routes_with_linkdown = `0`,
292	.keep_addr_on_down = `0`,
293	.seg6_enabled = `0`,
294	#ifdef CONFIG_IPV6_SEG6_HMAC
295	.seg6_require_hmac = `0`,
296	#endif
297	.enhanced_dad = `1`,
298	.addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
299	.disable_policy = `0`,
300	.rpl_seg_enabled = `0`,
301	.ioam6_enabled = `0`,
302	.ioam6_id = IOAM6_DEFAULT_IF_ID,
303	.ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
304	.ndisc_evict_nocarrier = `1`,
305	.ra_honor_pio_life = `0`,
306	.ra_honor_pio_pflag = `0`,
307	.force_forwarding = `0`,
308	};
309
310	/ Check if link is ready: is it up and is a valid qdisc available /
311	static inline bool addrconf_link_ready(const struct net_device *dev)
312	{
313	return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
314	}
315
316	static void addrconf_del_rs_timer(struct inet6_dev *idev)
317	{
318	if (timer_delete(timer: &idev->rs_timer))
319	__in6_dev_put(idev);
320	}
321
322	static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
323	{
324	if (cancel_delayed_work(dwork: &ifp->dad_work))
325	__in6_ifa_put(ifp);
326	}
327
328	static void addrconf_mod_rs_timer(struct inet6_dev *idev,
329	unsigned long when)
330	{
331	if (!mod_timer(timer: &idev->rs_timer, expires: jiffies + when))
332	in6_dev_hold(idev);
333	}
334
335	static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
336	unsigned long delay)
337	{
338	in6_ifa_hold(ifp);
339	if (mod_delayed_work(wq: addrconf_wq, dwork: &ifp->dad_work, delay))
340	in6_ifa_put(ifp);
341	}
342
343	static int snmp6_alloc_dev(struct inet6_dev *idev)
344	{
345	int i;
346
347	idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
348	if (!idev->stats.ipv6)
349	goto err_ip;
350
351	for_each_possible_cpu(i) {
352	struct ipstats_mib *addrconf_stats;
353	addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
354	u64_stats_init(syncp: &addrconf_stats->syncp);
355	}
356
357
358	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
359	GFP_KERNEL);
360	if (!idev->stats.icmpv6dev)
361	goto err_icmp;
362	idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
363	GFP_KERNEL_ACCOUNT);
364	if (!idev->stats.icmpv6msgdev)
365	goto err_icmpmsg;
366
367	return `0`;
368
369	err_icmpmsg:
370	kfree(objp: idev->stats.icmpv6dev);
371	err_icmp:
372	free_percpu(pdata: idev->stats.ipv6);
373	err_ip:
374	return -ENOMEM;
375	}
376
377	static struct inet6_dev ipv6_add_dev(struct* net_device *dev)
378	{
379	struct inet6_dev *ndev;
380	int err = -ENOMEM;
381
382	ASSERT_RTNL();
383	netdev_ops_assert_locked(dev);
384
385	if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
386	return ERR_PTR(error: -EINVAL);
387
388	ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
389	if (!ndev)
390	return ERR_PTR(error: err);
391
392	rwlock_init(&ndev->lock);
393	ndev->dev = dev;
394	INIT_LIST_HEAD(list: &ndev->addr_list);
395	timer_setup(&ndev->rs_timer, addrconf_rs_timer, `0`);
396	memcpy(to: &ndev->cnf, from: dev_net(dev)->ipv6.devconf_dflt, len: sizeof(ndev->cnf));
397
398	if (ndev->cnf.stable_secret.initialized)
399	ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
400
401	ndev->cnf.mtu6 = dev->mtu;
402	ndev->ra_mtu = `0`;
403	ndev->nd_parms = neigh_parms_alloc(dev, tbl: &nd_tbl);
404	if (!ndev->nd_parms) {
405	kfree(objp: ndev);
406	return ERR_PTR(error: err);
407	}
408	if (ndev->cnf.forwarding)
409	netif_disable_lro(dev);
410	/ We refer to the device /
411	netdev_hold(dev, tracker: &ndev->dev_tracker, GFP_KERNEL);
412
413	if (snmp6_alloc_dev(idev: ndev) < `0`) {
414	netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
415	__func__);
416	neigh_parms_release(tbl: &nd_tbl, parms: ndev->nd_parms);
417	netdev_put(dev, tracker: &ndev->dev_tracker);
418	kfree(objp: ndev);
419	return ERR_PTR(error: err);
420	}
421
422	if (dev != blackhole_netdev) {
423	if (snmp6_register_dev(idev: ndev) < `0`) {
424	netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
425	__func__, dev->name);
426	goto err_release;
427	}
428	}
429	/ One reference from device. /
430	refcount_set(r: &ndev->refcnt, n: `1`);
431
432	if (dev->flags & (IFF_NOARP \| IFF_LOOPBACK))
433	ndev->cnf.accept_dad = -`1`;
434
435	#if IS_ENABLED(CONFIG_IPV6_SIT)
436	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
437	pr_info("%s: Disabled Multicast RS\n", dev->name);
438	ndev->cnf.rtr_solicits = `0`;
439	}
440	#endif
441
442	INIT_LIST_HEAD(list: &ndev->tempaddr_list);
443	ndev->desync_factor = U32_MAX;
444	if ((dev->flags&IFF_LOOPBACK) \|\|
445	dev->type == ARPHRD_TUNNEL \|\|
446	dev->type == ARPHRD_TUNNEL6 \|\|
447	dev->type == ARPHRD_SIT \|\|
448	dev->type == ARPHRD_NONE) {
449	ndev->cnf.use_tempaddr = -`1`;
450	}
451
452	ndev->token = in6addr_any;
453
454	if (netif_running(dev) && addrconf_link_ready(dev))
455	ndev->if_flags \|= IF_READY;
456
457	ipv6_mc_init_dev(idev: ndev);
458	ndev->tstamp = jiffies;
459	if (dev != blackhole_netdev) {
460	err = addrconf_sysctl_register(idev: ndev);
461	if (err) {
462	ipv6_mc_destroy_dev(idev: ndev);
463	snmp6_unregister_dev(idev: ndev);
464	goto err_release;
465	}
466	}
467	/ protected by rtnl_lock /
468	rcu_assign_pointer(dev->ip6_ptr, ndev);
469
470	if (dev != blackhole_netdev) {
471	/ Join interface-local all-node multicast group /
472	ipv6_dev_mc_inc(dev, addr: &in6addr_interfacelocal_allnodes);
473
474	/ Join all-node multicast group /
475	ipv6_dev_mc_inc(dev, addr: &in6addr_linklocal_allnodes);
476
477	/ Join all-router multicast group if forwarding is set /
478	if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
479	ipv6_dev_mc_inc(dev, addr: &in6addr_linklocal_allrouters);
480	}
481	return ndev;
482
483	err_release:
484	neigh_parms_release(tbl: &nd_tbl, parms: ndev->nd_parms);
485	ndev->dead = `1`;
486	in6_dev_finish_destroy(idev: ndev);
487	return ERR_PTR(error: err);
488	}
489
490	static struct inet6_dev ipv6_find_idev(struct* net_device *dev)
491	{
492	struct inet6_dev *idev;
493
494	ASSERT_RTNL();
495
496	idev = __in6_dev_get(dev);
497	if (!idev) {
498	idev = ipv6_add_dev(dev);
499	if (IS_ERR(ptr: idev))
500	return idev;
501	}
502
503	if (dev->flags&IFF_UP)
504	ipv6_mc_up(idev);
505	return idev;
506	}
507
508	static int inet6_netconf_msgsize_devconf(int type)
509	{
510	int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
511	+ nla_total_size(payload: `4`); / NETCONFA_IFINDEX /
512	bool all = false;
513
514	if (type == NETCONFA_ALL)
515	all = true;
516
517	if (all \|\| type == NETCONFA_FORWARDING)
518	size += nla_total_size(payload: `4`);
519	#ifdef CONFIG_IPV6_MROUTE
520	if (all \|\| type == NETCONFA_MC_FORWARDING)
521	size += nla_total_size(`4`);
522	#endif
523	if (all \|\| type == NETCONFA_PROXY_NEIGH)
524	size += nla_total_size(payload: `4`);
525
526	if (all \|\| type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
527	size += nla_total_size(payload: `4`);
528
529	return size;
530	}
531
532	static int inet6_netconf_fill_devconf(struct sk_buff skb, int* ifindex,
533	struct ipv6_devconf *devconf, u32 portid,
534	u32 seq, int event, unsigned int flags,
535	int type)
536	{
537	struct nlmsghdr *nlh;
538	struct netconfmsg *ncm;
539	bool all = false;
540
541	nlh = nlmsg_put(skb, portid, seq, type: event, payload: sizeof(struct netconfmsg),
542	flags);
543	if (!nlh)
544	return -EMSGSIZE;
545
546	if (type == NETCONFA_ALL)
547	all = true;
548
549	ncm = nlmsg_data(nlh);
550	ncm->ncm_family = AF_INET6;
551
552	if (nla_put_s32(skb, attrtype: NETCONFA_IFINDEX, value: ifindex) < `0`)
553	goto nla_put_failure;
554
555	if (!devconf)
556	goto out;
557
558	if ((all \|\| type == NETCONFA_FORWARDING) &&
559	nla_put_s32(skb, attrtype: NETCONFA_FORWARDING,
560	READ_ONCE(devconf->forwarding)) < `0`)
561	goto nla_put_failure;
562	#ifdef CONFIG_IPV6_MROUTE
563	if ((all \|\| type == NETCONFA_MC_FORWARDING) &&
564	nla_put_s32(skb, NETCONFA_MC_FORWARDING,
565	atomic_read(&devconf->mc_forwarding)) < `0`)
566	goto nla_put_failure;
567	#endif
568	if ((all \|\| type == NETCONFA_PROXY_NEIGH) &&
569	nla_put_s32(skb, attrtype: NETCONFA_PROXY_NEIGH,
570	READ_ONCE(devconf->proxy_ndp)) < `0`)
571	goto nla_put_failure;
572
573	if ((all \|\| type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
574	nla_put_s32(skb, attrtype: NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
575	READ_ONCE(devconf->ignore_routes_with_linkdown)) < `0`)
576	goto nla_put_failure;
577
578	out:
579	nlmsg_end(skb, nlh);
580	return `0`;
581
582	nla_put_failure:
583	nlmsg_cancel(skb, nlh);
584	return -EMSGSIZE;
585	}
586
587	void inet6_netconf_notify_devconf(struct net net, int* event, int type,
588	int ifindex, struct ipv6_devconf *devconf)
589	{
590	struct sk_buff *skb;
591	int err = -ENOBUFS;
592
593	skb = nlmsg_new(payload: inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
594	if (!skb)
595	goto errout;
596
597	err = inet6_netconf_fill_devconf(skb, ifindex, devconf, portid: `0`, seq: `0`,
598	event, flags: `0`, type);
599	if (err < `0`) {
600	/ -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() /
601	WARN_ON(err == -EMSGSIZE);
602	kfree_skb(skb);
603	goto errout;
604	}
605	rtnl_notify(skb, net, pid: `0`, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
606	return;
607	errout:
608	rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, error: err);
609	}
610
611	static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+`1`] = {
612	[NETCONFA_IFINDEX] = { .len = sizeof(int) },
613	[NETCONFA_FORWARDING] = { .len = sizeof(int) },
614	[NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
615	[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
616	};
617
618	static int inet6_netconf_valid_get_req(struct sk_buff *skb,
619	const struct nlmsghdr *nlh,
620	struct nlattr **tb,
621	struct netlink_ext_ack *extack)
622	{
623	int i, err;
624
625	if (nlh->nlmsg_len < nlmsg_msg_size(payload: sizeof(struct netconfmsg))) {
626	NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
627	return -EINVAL;
628	}
629
630	if (!netlink_strict_get_check(skb))
631	return nlmsg_parse_deprecated(nlh, hdrlen: sizeof(struct netconfmsg),
632	tb, NETCONFA_MAX,
633	policy: devconf_ipv6_policy, extack);
634
635	err = nlmsg_parse_deprecated_strict(nlh, hdrlen: sizeof(struct netconfmsg),
636	tb, NETCONFA_MAX,
637	policy: devconf_ipv6_policy, extack);
638	if (err)
639	return err;
640
641	for (i = `0`; i <= NETCONFA_MAX; i++) {
642	if (!tb[i])
643	continue;
644
645	switch (i) {
646	case NETCONFA_IFINDEX:
647	break;
648	default:
649	NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
650	return -EINVAL;
651	}
652	}
653
654	return `0`;
655	}
656
657	static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
658	struct nlmsghdr *nlh,
659	struct netlink_ext_ack *extack)
660	{
661	struct net *net = sock_net(sk: in_skb->sk);
662	struct nlattr *tb[NETCONFA_MAX+`1`];
663	struct inet6_dev *in6_dev = NULL;
664	struct net_device *dev = NULL;
665	struct sk_buff *skb;
666	struct ipv6_devconf *devconf;
667	int ifindex;
668	int err;
669
670	err = inet6_netconf_valid_get_req(skb: in_skb, nlh, tb, extack);
671	if (err < `0`)
672	return err;
673
674	if (!tb[NETCONFA_IFINDEX])
675	return -EINVAL;
676
677	err = -EINVAL;
678	ifindex = nla_get_s32(nla: tb[NETCONFA_IFINDEX]);
679	switch (ifindex) {
680	case NETCONFA_IFINDEX_ALL:
681	devconf = net->ipv6.devconf_all;
682	break;
683	case NETCONFA_IFINDEX_DEFAULT:
684	devconf = net->ipv6.devconf_dflt;
685	break;
686	default:
687	dev = dev_get_by_index(net, ifindex);
688	if (!dev)
689	return -EINVAL;
690	in6_dev = in6_dev_get(dev);
691	if (!in6_dev)
692	goto errout;
693	devconf = &in6_dev->cnf;
694	break;
695	}
696
697	err = -ENOBUFS;
698	skb = nlmsg_new(payload: inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
699	if (!skb)
700	goto errout;
701
702	err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
703	NETLINK_CB(in_skb).portid,
704	seq: nlh->nlmsg_seq, RTM_NEWNETCONF, flags: `0`,
705	NETCONFA_ALL);
706	if (err < `0`) {
707	/ -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() /
708	WARN_ON(err == -EMSGSIZE);
709	kfree_skb(skb);
710	goto errout;
711	}
712	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
713	errout:
714	if (in6_dev)
715	in6_dev_put(idev: in6_dev);
716	dev_put(dev);
717	return err;
718	}
719
720	/ Combine dev_addr_genid and dev_base_seq to detect changes.*
721	*/
722	static u32 inet6_base_seq(const struct net *net)
723	{
724	u32 res = atomic_read(v: &net->ipv6.dev_addr_genid) +
725	READ_ONCE(net->dev_base_seq);
726
727	/ Must not return 0 (see nl_dump_check_consistent()).*
728	* Chose a value far away from 0.
729	*/
730	if (!res)
731	res = `0x80000000`;
732	return res;
733	}
734
735	static int inet6_netconf_dump_devconf(struct sk_buff *skb,
736	struct netlink_callback *cb)
737	{
738	const struct nlmsghdr *nlh = cb->nlh;
739	struct net *net = sock_net(sk: skb->sk);
740	struct {
741	unsigned long ifindex;
742	unsigned int all_default;
743	} ctx = (void* *)cb->ctx;
744	struct net_device *dev;
745	struct inet6_dev *idev;
746	int err = `0`;
747
748	if (cb->strict_check) {
749	struct netlink_ext_ack *extack = cb->extack;
750	struct netconfmsg *ncm;
751
752	if (nlh->nlmsg_len < nlmsg_msg_size(payload: sizeof(*ncm))) {
753	NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
754	return -EINVAL;
755	}
756
757	if (nlmsg_attrlen(nlh, hdrlen: sizeof(*ncm))) {
758	NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
759	return -EINVAL;
760	}
761	}
762
763	rcu_read_lock();
764	for_each_netdev_dump(net, dev, ctx->ifindex) {
765	idev = __in6_dev_get(dev);
766	if (!idev)
767	continue;
768	err = inet6_netconf_fill_devconf(skb, ifindex: dev->ifindex,
769	devconf: &idev->cnf,
770	NETLINK_CB(cb->skb).portid,
771	seq: nlh->nlmsg_seq,
772	RTM_NEWNETCONF,
773	NLM_F_MULTI,
774	NETCONFA_ALL);
775	if (err < `0`)
776	goto done;
777	}
778	if (ctx->all_default == `0`) {
779	err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
780	devconf: net->ipv6.devconf_all,
781	NETLINK_CB(cb->skb).portid,
782	seq: nlh->nlmsg_seq,
783	RTM_NEWNETCONF, NLM_F_MULTI,
784	NETCONFA_ALL);
785	if (err < `0`)
786	goto done;
787	ctx->all_default++;
788	}
789	if (ctx->all_default == `1`) {
790	err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
791	devconf: net->ipv6.devconf_dflt,
792	NETLINK_CB(cb->skb).portid,
793	seq: nlh->nlmsg_seq,
794	RTM_NEWNETCONF, NLM_F_MULTI,
795	NETCONFA_ALL);
796	if (err < `0`)
797	goto done;
798	ctx->all_default++;
799	}
800	done:
801	rcu_read_unlock();
802	return err;
803	}
804
805	#ifdef CONFIG_SYSCTL
806	static void dev_forward_change(struct inet6_dev *idev)
807	{
808	struct net_device *dev;
809	struct inet6_ifaddr *ifa;
810	LIST_HEAD(tmp_addr_list);
811
812	if (!idev)
813	return;
814	dev = idev->dev;
815	if (idev->cnf.forwarding)
816	dev_disable_lro(dev);
817	if (dev->flags & IFF_MULTICAST) {
818	if (idev->cnf.forwarding) {
819	ipv6_dev_mc_inc(dev, addr: &in6addr_linklocal_allrouters);
820	ipv6_dev_mc_inc(dev, addr: &in6addr_interfacelocal_allrouters);
821	ipv6_dev_mc_inc(dev, addr: &in6addr_sitelocal_allrouters);
822	} else {
823	ipv6_dev_mc_dec(dev, addr: &in6addr_linklocal_allrouters);
824	ipv6_dev_mc_dec(dev, addr: &in6addr_interfacelocal_allrouters);
825	ipv6_dev_mc_dec(dev, addr: &in6addr_sitelocal_allrouters);
826	}
827	}
828
829	read_lock_bh(&idev->lock);
830	list_for_each_entry(ifa, &idev->addr_list, if_list) {
831	if (ifa->flags&IFA_F_TENTATIVE)
832	continue;
833	list_add_tail(new: &ifa->if_list_aux, head: &tmp_addr_list);
834	}
835	read_unlock_bh(&idev->lock);
836
837	while (!list_empty(head: &tmp_addr_list)) {
838	ifa = list_first_entry(&tmp_addr_list,
839	struct inet6_ifaddr, if_list_aux);
840	list_del(entry: &ifa->if_list_aux);
841	if (idev->cnf.forwarding)
842	addrconf_join_anycast(ifp: ifa);
843	else
844	addrconf_leave_anycast(ifp: ifa);
845	}
846
847	inet6_netconf_notify_devconf(net: dev_net(dev), RTM_NEWNETCONF,
848	type: NETCONFA_FORWARDING,
849	ifindex: dev->ifindex, devconf: &idev->cnf);
850	}
851
852
853	static void addrconf_forward_change(struct net *net, __s32 newf)
854	{
855	struct net_device *dev;
856	struct inet6_dev *idev;
857
858	for_each_netdev(net, dev) {
859	idev = __in6_dev_get_rtnl_net(dev);
860	if (idev) {
861	int changed = (!idev->cnf.forwarding) ^ (!newf);
862	/ Disabling all.forwarding sets 0 to force_forwarding for all interfaces /
863	if (newf == `0`)
864	WRITE_ONCE(idev->cnf.force_forwarding, `0`);
865
866	WRITE_ONCE(idev->cnf.forwarding, newf);
867	if (changed)
868	dev_forward_change(idev);
869	}
870	}
871	}
872
873	static int addrconf_fixup_forwarding(const struct ctl_table table, int* p, int* newf)
874	{
875	struct net net = (struct* net *)table->extra2;
876	int old;
877
878	if (!rtnl_net_trylock(net))
879	return restart_syscall();
880
881	old = *p;
882	WRITE_ONCE(*p, newf);
883
884	if (p == &net->ipv6.devconf_dflt->forwarding) {
885	if ((!newf) ^ (!old))
886	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
887	type: NETCONFA_FORWARDING,
888	NETCONFA_IFINDEX_DEFAULT,
889	devconf: net->ipv6.devconf_dflt);
890	rtnl_net_unlock(net);
891	return `0`;
892	}
893
894	if (p == &net->ipv6.devconf_all->forwarding) {
895	int old_dflt = net->ipv6.devconf_dflt->forwarding;
896
897	WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
898	if ((!newf) ^ (!old_dflt))
899	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
900	type: NETCONFA_FORWARDING,
901	NETCONFA_IFINDEX_DEFAULT,
902	devconf: net->ipv6.devconf_dflt);
903
904	addrconf_forward_change(net, newf);
905	if ((!newf) ^ (!old))
906	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
907	type: NETCONFA_FORWARDING,
908	NETCONFA_IFINDEX_ALL,
909	devconf: net->ipv6.devconf_all);
910	} else if ((!newf) ^ (!old))
911	dev_forward_change(idev: (struct inet6_dev *)table->extra1);
912	rtnl_net_unlock(net);
913
914	if (newf)
915	rt6_purge_dflt_routers(net);
916	return `1`;
917	}
918
919	static void addrconf_linkdown_change(struct net *net, __s32 newf)
920	{
921	struct net_device *dev;
922	struct inet6_dev *idev;
923
924	for_each_netdev(net, dev) {
925	idev = __in6_dev_get_rtnl_net(dev);
926	if (idev) {
927	int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
928
929	WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
930	if (changed)
931	inet6_netconf_notify_devconf(net: dev_net(dev),
932	RTM_NEWNETCONF,
933	type: NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
934	ifindex: dev->ifindex,
935	devconf: &idev->cnf);
936	}
937	}
938	}
939
940	static int addrconf_fixup_linkdown(const struct ctl_table table, int* p, int* newf)
941	{
942	struct net net = (struct* net *)table->extra2;
943	int old;
944
945	if (!rtnl_net_trylock(net))
946	return restart_syscall();
947
948	old = *p;
949	WRITE_ONCE(*p, newf);
950
951	if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
952	if ((!newf) ^ (!old))
953	inet6_netconf_notify_devconf(net,
954	RTM_NEWNETCONF,
955	type: NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
956	NETCONFA_IFINDEX_DEFAULT,
957	devconf: net->ipv6.devconf_dflt);
958	rtnl_net_unlock(net);
959	return `0`;
960	}
961
962	if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
963	WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
964	addrconf_linkdown_change(net, newf);
965	if ((!newf) ^ (!old))
966	inet6_netconf_notify_devconf(net,
967	RTM_NEWNETCONF,
968	type: NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
969	NETCONFA_IFINDEX_ALL,
970	devconf: net->ipv6.devconf_all);
971	}
972
973	rtnl_net_unlock(net);
974
975	return `1`;
976	}
977
978	#endif
979
980	/ Nobody refers to this ifaddr, destroy it /
981	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
982	{
983	WARN_ON(!hlist_unhashed(&ifp->addr_lst));
984
985	#ifdef NET_REFCNT_DEBUG
986	pr_debug("%s\n", __func__);
987	#endif
988
989	in6_dev_put(idev: ifp->idev);
990
991	if (cancel_delayed_work(dwork: &ifp->dad_work))
992	pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
993	ifp);
994
995	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
996	pr_warn("Freeing alive inet6 address %p\n", ifp);
997	return;
998	}
999
1000	kfree_rcu(ifp, rcu);
1001	}
1002
1003	static void
1004	ipv6_link_dev_addr(struct inet6_dev idev, struct* inet6_ifaddr *ifp)
1005	{
1006	struct list_head *p;
1007	int ifp_scope = ipv6_addr_src_scope(addr: &ifp->addr);
1008
1009	/*
1010	* Each device address list is sorted in order of scope -
1011	* global before linklocal.
1012	*/
1013	list_for_each(p, &idev->addr_list) {
1014	struct inet6_ifaddr *ifa
1015	= list_entry(p, struct inet6_ifaddr, if_list);
1016	if (ifp_scope >= ipv6_addr_src_scope(addr: &ifa->addr))
1017	break;
1018	}
1019
1020	list_add_tail_rcu(new: &ifp->if_list, head: p);
1021	}
1022
1023	static u32 inet6_addr_hash(const struct net net, const* struct in6_addr *addr)
1024	{
1025	u32 val = __ipv6_addr_jhash(a: addr, initval: net_hash_mix(net));
1026
1027	return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1028	}
1029
1030	static bool ipv6_chk_same_addr(struct net net, const* struct in6_addr *addr,
1031	struct net_device dev, unsigned* int hash)
1032	{
1033	struct inet6_ifaddr *ifp;
1034
1035	hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1036	if (ipv6_addr_equal(a1: &ifp->addr, a2: addr)) {
1037	if (!dev \|\| ifp->idev->dev == dev)
1038	return true;
1039	}
1040	}
1041	return false;
1042	}
1043
1044	static int ipv6_add_addr_hash(struct net_device dev, struct* inet6_ifaddr *ifa)
1045	{
1046	struct net *net = dev_net(dev);
1047	unsigned int hash = inet6_addr_hash(net, addr: &ifa->addr);
1048	int err = `0`;
1049
1050	spin_lock_bh(lock: &net->ipv6.addrconf_hash_lock);
1051
1052	/ Ignore adding duplicate addresses on an interface /
1053	if (ipv6_chk_same_addr(net, addr: &ifa->addr, dev, hash)) {
1054	netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1055	err = -EEXIST;
1056	} else {
1057	hlist_add_head_rcu(n: &ifa->addr_lst, h: &net->ipv6.inet6_addr_lst[hash]);
1058	}
1059
1060	spin_unlock_bh(lock: &net->ipv6.addrconf_hash_lock);
1061
1062	return err;
1063	}
1064
1065	/ On success it returns ifp with increased reference count /
1066
1067	static struct inet6_ifaddr *
1068	ipv6_add_addr(struct inet6_dev idev, struct* ifa6_config *cfg,
1069	bool can_block, struct netlink_ext_ack *extack)
1070	{
1071	gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1072	int addr_type = ipv6_addr_type(addr: cfg->pfx);
1073	struct net *net = dev_net(dev: idev->dev);
1074	struct inet6_ifaddr *ifa = NULL;
1075	struct fib6_info *f6i = NULL;
1076	int err = `0`;
1077
1078	if (addr_type == IPV6_ADDR_ANY) {
1079	NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1080	return ERR_PTR(error: -EADDRNOTAVAIL);
1081	} else if (addr_type & IPV6_ADDR_MULTICAST &&
1082	!(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1083	NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1084	return ERR_PTR(error: -EADDRNOTAVAIL);
1085	} else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1086	!netif_is_l3_master(dev: idev->dev) &&
1087	addr_type & IPV6_ADDR_LOOPBACK) {
1088	NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1089	return ERR_PTR(error: -EADDRNOTAVAIL);
1090	}
1091
1092	if (idev->dead) {
1093	NL_SET_ERR_MSG_MOD(extack, "device is going away");
1094	err = -ENODEV;
1095	goto out;
1096	}
1097
1098	if (idev->cnf.disable_ipv6) {
1099	NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1100	err = -EACCES;
1101	goto out;
1102	}
1103
1104	/ validator notifier needs to be blocking;*
1105	* do not call in atomic context
1106	*/
1107	if (can_block) {
1108	struct in6_validator_info i6vi = {
1109	.i6vi_addr = *cfg->pfx,
1110	.i6vi_dev = idev,
1111	.extack = extack,
1112	};
1113
1114	err = inet6addr_validator_notifier_call_chain(val: NETDEV_UP, v: &i6vi);
1115	err = notifier_to_errno(ret: err);
1116	if (err < `0`)
1117	goto out;
1118	}
1119
1120	ifa = kzalloc(sizeof(*ifa), gfp_flags \| __GFP_ACCOUNT);
1121	if (!ifa) {
1122	err = -ENOBUFS;
1123	goto out;
1124	}
1125
1126	f6i = addrconf_f6i_alloc(net, idev, addr: cfg->pfx, anycast: false, gfp_flags, extack);
1127	if (IS_ERR(ptr: f6i)) {
1128	err = PTR_ERR(ptr: f6i);
1129	f6i = NULL;
1130	goto out;
1131	}
1132
1133	neigh_parms_data_state_setall(p: idev->nd_parms);
1134
1135	ifa->addr = *cfg->pfx;
1136	if (cfg->peer_pfx)
1137	ifa->peer_addr = *cfg->peer_pfx;
1138
1139	spin_lock_init(&ifa->lock);
1140	INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1141	INIT_HLIST_NODE(h: &ifa->addr_lst);
1142	ifa->scope = cfg->scope;
1143	ifa->prefix_len = cfg->plen;
1144	ifa->rt_priority = cfg->rt_priority;
1145	ifa->flags = cfg->ifa_flags;
1146	ifa->ifa_proto = cfg->ifa_proto;
1147	/ No need to add the TENTATIVE flag for addresses with NODAD /
1148	if (!(cfg->ifa_flags & IFA_F_NODAD))
1149	ifa->flags \|= IFA_F_TENTATIVE;
1150	ifa->valid_lft = cfg->valid_lft;
1151	ifa->prefered_lft = cfg->preferred_lft;
1152	ifa->cstamp = ifa->tstamp = jiffies;
1153	ifa->tokenized = false;
1154
1155	ifa->rt = f6i;
1156
1157	ifa->idev = idev;
1158	in6_dev_hold(idev);
1159
1160	/ For caller /
1161	refcount_set(r: &ifa->refcnt, n: `1`);
1162
1163	rcu_read_lock();
1164
1165	err = ipv6_add_addr_hash(dev: idev->dev, ifa);
1166	if (err < `0`) {
1167	rcu_read_unlock();
1168	goto out;
1169	}
1170
1171	write_lock_bh(&idev->lock);
1172
1173	/ Add to inet6_dev unicast addr list. /
1174	ipv6_link_dev_addr(idev, ifp: ifa);
1175
1176	if (ifa->flags&IFA_F_TEMPORARY) {
1177	list_add(new: &ifa->tmp_list, head: &idev->tempaddr_list);
1178	in6_ifa_hold(ifp: ifa);
1179	}
1180
1181	in6_ifa_hold(ifp: ifa);
1182	write_unlock_bh(&idev->lock);
1183
1184	rcu_read_unlock();
1185
1186	inet6addr_notifier_call_chain(val: NETDEV_UP, v: ifa);
1187	out:
1188	if (unlikely(err < `0`)) {
1189	fib6_info_release(f6i);
1190
1191	if (ifa) {
1192	if (ifa->idev)
1193	in6_dev_put(idev: ifa->idev);
1194	kfree(objp: ifa);
1195	}
1196	ifa = ERR_PTR(error: err);
1197	}
1198
1199	return ifa;
1200	}
1201
1202	enum cleanup_prefix_rt_t {
1203	CLEANUP_PREFIX_RT_NOP, / no cleanup action for prefix route /
1204	CLEANUP_PREFIX_RT_DEL, / delete the prefix route /
1205	CLEANUP_PREFIX_RT_EXPIRE, / update the lifetime of the prefix route /
1206	};
1207
1208	/*
1209	* Check, whether the prefix for ifp would still need a prefix route
1210	* after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1211	* constants.
1212	*
1213	* 1) we don't purge prefix if address was not permanent.
1214	* prefix is managed by its own lifetime.
1215	* 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1216	* 3) if there are no addresses, delete prefix.
1217	* 4) if there are still other permanent address(es),
1218	* corresponding prefix is still permanent.
1219	* 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1220	* don't purge the prefix, assume user space is managing it.
1221	* 6) otherwise, update prefix lifetime to the
1222	* longest valid lifetime among the corresponding
1223	* addresses on the device.
1224	* Note: subsequent RA will update lifetime.
1225	**/
1226	static enum cleanup_prefix_rt_t
1227	check_cleanup_prefix_route(struct inet6_ifaddr ifp, unsigned* long *expires)
1228	{
1229	struct inet6_ifaddr *ifa;
1230	struct inet6_dev *idev = ifp->idev;
1231	unsigned long lifetime;
1232	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1233
1234	*expires = jiffies;
1235
1236	list_for_each_entry(ifa, &idev->addr_list, if_list) {
1237	if (ifa == ifp)
1238	continue;
1239	if (ifa->prefix_len != ifp->prefix_len \|\|
1240	!ipv6_prefix_equal(addr1: &ifa->addr, addr2: &ifp->addr,
1241	prefixlen: ifp->prefix_len))
1242	continue;
1243	if (ifa->flags & (IFA_F_PERMANENT \| IFA_F_NOPREFIXROUTE))
1244	return CLEANUP_PREFIX_RT_NOP;
1245
1246	action = CLEANUP_PREFIX_RT_EXPIRE;
1247
1248	spin_lock(lock: &ifa->lock);
1249
1250	lifetime = addrconf_timeout_fixup(timeout: ifa->valid_lft, HZ);
1251	/*
1252	* Note: Because this address is
1253	* not permanent, lifetime <
1254	* LONG_MAX / HZ here.
1255	*/
1256	if (time_before(expires, ifa->tstamp + lifetime HZ))
1257	expires = ifa->tstamp + lifetime HZ;
1258	spin_unlock(lock: &ifa->lock);
1259	}
1260
1261	return action;
1262	}
1263
1264	static void
1265	cleanup_prefix_route(struct inet6_ifaddr ifp, unsigned* long expires,
1266	bool del_rt, bool del_peer)
1267	{
1268	struct fib6_table *table;
1269	struct fib6_info *f6i;
1270
1271	f6i = addrconf_get_prefix_route(pfx: del_peer ? &ifp->peer_addr : &ifp->addr,
1272	plen: ifp->prefix_len,
1273	dev: ifp->idev->dev, flags: `0`, RTF_DEFAULT, no_gw: true);
1274	if (f6i) {
1275	if (del_rt)
1276	ip6_del_rt(net: dev_net(dev: ifp->idev->dev), f6i, skip_notify: false);
1277	else {
1278	if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1279	table = f6i->fib6_table;
1280	spin_lock_bh(lock: &table->tb6_lock);
1281
1282	fib6_set_expires(f6i, expires);
1283	fib6_add_gc_list(f6i);
1284
1285	spin_unlock_bh(lock: &table->tb6_lock);
1286	}
1287	fib6_info_release(f6i);
1288	}
1289	}
1290	}
1291
1292
1293	/ This function wants to get referenced ifp and releases it before return /
1294
1295	static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1296	{
1297	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1298	struct net *net = dev_net(dev: ifp->idev->dev);
1299	unsigned long expires;
1300	int state;
1301
1302	ASSERT_RTNL();
1303
1304	spin_lock_bh(lock: &ifp->lock);
1305	state = ifp->state;
1306	ifp->state = INET6_IFADDR_STATE_DEAD;
1307	spin_unlock_bh(lock: &ifp->lock);
1308
1309	if (state == INET6_IFADDR_STATE_DEAD)
1310	goto out;
1311
1312	spin_lock_bh(lock: &net->ipv6.addrconf_hash_lock);
1313	hlist_del_init_rcu(n: &ifp->addr_lst);
1314	spin_unlock_bh(lock: &net->ipv6.addrconf_hash_lock);
1315
1316	write_lock_bh(&ifp->idev->lock);
1317
1318	if (ifp->flags&IFA_F_TEMPORARY) {
1319	list_del(entry: &ifp->tmp_list);
1320	if (ifp->ifpub) {
1321	in6_ifa_put(ifp: ifp->ifpub);
1322	ifp->ifpub = NULL;
1323	}
1324	__in6_ifa_put(ifp);
1325	}
1326
1327	if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1328	action = check_cleanup_prefix_route(ifp, expires: &expires);
1329
1330	list_del_rcu(entry: &ifp->if_list);
1331	__in6_ifa_put(ifp);
1332
1333	write_unlock_bh(&ifp->idev->lock);
1334
1335	addrconf_del_dad_work(ifp);
1336
1337	ipv6_ifa_notify(RTM_DELADDR, ifa: ifp);
1338
1339	inet6addr_notifier_call_chain(val: NETDEV_DOWN, v: ifp);
1340
1341	if (action != CLEANUP_PREFIX_RT_NOP) {
1342	cleanup_prefix_route(ifp, expires,
1343	del_rt: action == CLEANUP_PREFIX_RT_DEL, del_peer: false);
1344	}
1345
1346	/ clean up prefsrc entries /
1347	rt6_remove_prefsrc(ifp);
1348	out:
1349	in6_ifa_put(ifp);
1350	}
1351
1352	static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1353	{
1354	return READ_ONCE(idev->cnf.regen_min_advance) +
1355	READ_ONCE(idev->cnf.regen_max_retry) *
1356	READ_ONCE(idev->cnf.dad_transmits) *
1357	max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/`100`) / HZ;
1358	}
1359
1360	static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1361	{
1362	struct inet6_dev *idev = ifp->idev;
1363	unsigned long tmp_tstamp, age;
1364	unsigned long regen_advance;
1365	unsigned long now = jiffies;
1366	u32 if_public_preferred_lft;
1367	s32 cnf_temp_preferred_lft;
1368	struct inet6_ifaddr *ift;
1369	struct ifa6_config cfg;
1370	long max_desync_factor;
1371	struct in6_addr addr;
1372	int ret = `0`;
1373
1374	write_lock_bh(&idev->lock);
1375
1376	retry:
1377	in6_dev_hold(idev);
1378	if (READ_ONCE(idev->cnf.use_tempaddr) <= `0`) {
1379	write_unlock_bh(&idev->lock);
1380	pr_info("%s: use_tempaddr is disabled\n", __func__);
1381	in6_dev_put(idev);
1382	ret = -`1`;
1383	goto out;
1384	}
1385	spin_lock_bh(lock: &ifp->lock);
1386	if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1387	WRITE_ONCE(idev->cnf.use_tempaddr, -`1`); /XXX/
1388	spin_unlock_bh(lock: &ifp->lock);
1389	write_unlock_bh(&idev->lock);
1390	pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1391	__func__);
1392	in6_dev_put(idev);
1393	ret = -`1`;
1394	goto out;
1395	}
1396	in6_ifa_hold(ifp);
1397	memcpy(to: addr.s6_addr, from: ifp->addr.s6_addr, len: `8`);
1398	ipv6_gen_rnd_iid(addr: &addr);
1399
1400	age = (now - ifp->tstamp) / HZ;
1401
1402	regen_advance = ipv6_get_regen_advance(idev);
1403
1404	/ recalculate max_desync_factor each time and update*
1405	* idev->desync_factor if it's larger
1406	*/
1407	cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1408	max_desync_factor = min_t(long,
1409	READ_ONCE(idev->cnf.max_desync_factor),
1410	cnf_temp_preferred_lft - regen_advance);
1411
1412	if (unlikely(idev->desync_factor > max_desync_factor)) {
1413	if (max_desync_factor > `0`) {
1414	get_random_bytes(buf: &idev->desync_factor,
1415	len: sizeof(idev->desync_factor));
1416	idev->desync_factor %= max_desync_factor;
1417	} else {
1418	idev->desync_factor = `0`;
1419	}
1420	}
1421
1422	if_public_preferred_lft = ifp->prefered_lft;
1423
1424	memset(s: &cfg, c: `0`, n: sizeof(cfg));
1425	cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1426	READ_ONCE(idev->cnf.temp_valid_lft) + age);
1427	cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1428	cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1429	cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1430
1431	cfg.plen = ifp->prefix_len;
1432	tmp_tstamp = ifp->tstamp;
1433	spin_unlock_bh(lock: &ifp->lock);
1434
1435	write_unlock_bh(&idev->lock);
1436
1437	/ From RFC 4941:*
1438	*
1439	* A temporary address is created only if this calculated Preferred
1440	* Lifetime is greater than REGEN_ADVANCE time units. In
1441	* particular, an implementation must not create a temporary address
1442	* with a zero Preferred Lifetime.
1443	*
1444	* ...
1445	*
1446	* When creating a temporary address, the lifetime values MUST be
1447	* derived from the corresponding prefix as follows:
1448	*
1449	* ...
1450	*
1451	* * Its Preferred Lifetime is the lower of the Preferred Lifetime
1452	* of the public address or TEMP_PREFERRED_LIFETIME -
1453	* DESYNC_FACTOR.
1454	*
1455	* To comply with the RFC's requirements, clamp the preferred lifetime
1456	* to a minimum of regen_advance, unless that would exceed valid_lft or
1457	* ifp->prefered_lft.
1458	*
1459	* Use age calculation as in addrconf_verify to avoid unnecessary
1460	* temporary addresses being generated.
1461	*/
1462	age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1463	if (cfg.preferred_lft <= regen_advance + age) {
1464	cfg.preferred_lft = regen_advance + age + `1`;
1465	if (cfg.preferred_lft > cfg.valid_lft \|\|
1466	cfg.preferred_lft > if_public_preferred_lft) {
1467	in6_ifa_put(ifp);
1468	in6_dev_put(idev);
1469	ret = -`1`;
1470	goto out;
1471	}
1472	}
1473
1474	cfg.ifa_flags = IFA_F_TEMPORARY;
1475	/ set in addrconf_prefix_rcv() /
1476	if (ifp->flags & IFA_F_OPTIMISTIC)
1477	cfg.ifa_flags \|= IFA_F_OPTIMISTIC;
1478
1479	cfg.pfx = &addr;
1480	cfg.scope = ipv6_addr_scope(addr: cfg.pfx);
1481
1482	ift = ipv6_add_addr(idev, cfg: &cfg, can_block: block, NULL);
1483	if (IS_ERR(ptr: ift)) {
1484	in6_ifa_put(ifp);
1485	in6_dev_put(idev);
1486	pr_info("%s: retry temporary address regeneration\n", __func__);
1487	write_lock_bh(&idev->lock);
1488	goto retry;
1489	}
1490
1491	spin_lock_bh(lock: &ift->lock);
1492	ift->ifpub = ifp;
1493	ift->cstamp = now;
1494	ift->tstamp = tmp_tstamp;
1495	spin_unlock_bh(lock: &ift->lock);
1496
1497	addrconf_dad_start(ifp: ift);
1498	in6_ifa_put(ifp: ift);
1499	in6_dev_put(idev);
1500	out:
1501	return ret;
1502	}
1503
1504	/*
1505	* Choose an appropriate source address (RFC3484)
1506	*/
1507	enum {
1508	IPV6_SADDR_RULE_INIT = `0`,
1509	IPV6_SADDR_RULE_LOCAL,
1510	IPV6_SADDR_RULE_SCOPE,
1511	IPV6_SADDR_RULE_PREFERRED,
1512	#ifdef CONFIG_IPV6_MIP6
1513	IPV6_SADDR_RULE_HOA,
1514	#endif
1515	IPV6_SADDR_RULE_OIF,
1516	IPV6_SADDR_RULE_LABEL,
1517	IPV6_SADDR_RULE_PRIVACY,
1518	IPV6_SADDR_RULE_ORCHID,
1519	IPV6_SADDR_RULE_PREFIX,
1520	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1521	IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1522	#endif
1523	IPV6_SADDR_RULE_MAX
1524	};
1525
1526	struct ipv6_saddr_score {
1527	int rule;
1528	int addr_type;
1529	struct inet6_ifaddr *ifa;
1530	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1531	int scopedist;
1532	int matchlen;
1533	};
1534
1535	struct ipv6_saddr_dst {
1536	const struct in6_addr *addr;
1537	int ifindex;
1538	int scope;
1539	int label;
1540	unsigned int prefs;
1541	};
1542
1543	static inline int ipv6_saddr_preferred(int type)
1544	{
1545	if (type & (IPV6_ADDR_MAPPED\|IPV6_ADDR_COMPATv4\|IPV6_ADDR_LOOPBACK))
1546	return `1`;
1547	return `0`;
1548	}
1549
1550	static bool ipv6_use_optimistic_addr(const struct net *net,
1551	const struct inet6_dev *idev)
1552	{
1553	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1554	if (!idev)
1555	return false;
1556	if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1557	!READ_ONCE(idev->cnf.optimistic_dad))
1558	return false;
1559	if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1560	!READ_ONCE(idev->cnf.use_optimistic))
1561	return false;
1562
1563	return true;
1564	#else
1565	return false;
1566	#endif
1567	}
1568
1569	static bool ipv6_allow_optimistic_dad(const struct net *net,
1570	const struct inet6_dev *idev)
1571	{
1572	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1573	if (!idev)
1574	return false;
1575	if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1576	!READ_ONCE(idev->cnf.optimistic_dad))
1577	return false;
1578
1579	return true;
1580	#else
1581	return false;
1582	#endif
1583	}
1584
1585	static int ipv6_get_saddr_eval(struct net *net,
1586	struct ipv6_saddr_score *score,
1587	struct ipv6_saddr_dst *dst,
1588	int i)
1589	{
1590	int ret;
1591
1592	if (i <= score->rule) {
1593	switch (i) {
1594	case IPV6_SADDR_RULE_SCOPE:
1595	ret = score->scopedist;
1596	break;
1597	case IPV6_SADDR_RULE_PREFIX:
1598	ret = score->matchlen;
1599	break;
1600	default:
1601	ret = !!test_bit(i, score->scorebits);
1602	}
1603	goto out;
1604	}
1605
1606	switch (i) {
1607	case IPV6_SADDR_RULE_INIT:
1608	/ Rule 0: remember if hiscore is not ready yet /
1609	ret = !!score->ifa;
1610	break;
1611	case IPV6_SADDR_RULE_LOCAL:
1612	/ Rule 1: Prefer same address /
1613	ret = ipv6_addr_equal(a1: &score->ifa->addr, a2: dst->addr);
1614	break;
1615	case IPV6_SADDR_RULE_SCOPE:
1616	/ Rule 2: Prefer appropriate scope*
1617	*
1618	* ret
1619	* ^
1620	* -1 \| d 15
1621	* ---+--+-+---> scope
1622	* \|
1623	* \| d is scope of the destination.
1624	* B-d \| \
1625	* \| \ <- smaller scope is better if
1626	* B-15 \| \ if scope is enough for destination.
1627	* \| ret = B - scope (-1 <= scope >= d <= 15).
1628	* d-C-1 \| /
1629	* \|/ <- greater is better
1630	* -C / if scope is not enough for destination.
1631	* /\| ret = scope - C (-1 <= d < scope <= 15).
1632	*
1633	* d - C - 1 < B -15 (for all -1 <= d <= 15).
1634	* C > d + 14 - B >= 15 + 14 - B = 29 - B.
1635	* Assume B = 0 and we get C > 29.
1636	*/
1637	ret = __ipv6_addr_src_scope(type: score->addr_type);
1638	if (ret >= dst->scope)
1639	ret = -ret;
1640	else
1641	ret -= `128`; / 30 is enough /
1642	score->scopedist = ret;
1643	break;
1644	case IPV6_SADDR_RULE_PREFERRED:
1645	{
1646	/ Rule 3: Avoid deprecated and optimistic addresses /
1647	u8 avoid = IFA_F_DEPRECATED;
1648
1649	if (!ipv6_use_optimistic_addr(net, idev: score->ifa->idev))
1650	avoid \|= IFA_F_OPTIMISTIC;
1651	ret = ipv6_saddr_preferred(type: score->addr_type) \|\|
1652	!(score->ifa->flags & avoid);
1653	break;
1654	}
1655	#ifdef CONFIG_IPV6_MIP6
1656	case IPV6_SADDR_RULE_HOA:
1657	{
1658	/ Rule 4: Prefer home address /
1659	int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1660	ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1661	break;
1662	}
1663	#endif
1664	case IPV6_SADDR_RULE_OIF:
1665	/ Rule 5: Prefer outgoing interface /
1666	ret = (!dst->ifindex \|\|
1667	dst->ifindex == score->ifa->idev->dev->ifindex);
1668	break;
1669	case IPV6_SADDR_RULE_LABEL:
1670	/ Rule 6: Prefer matching label /
1671	ret = ipv6_addr_label(net,
1672	addr: &score->ifa->addr, type: score->addr_type,
1673	ifindex: score->ifa->idev->dev->ifindex) == dst->label;
1674	break;
1675	case IPV6_SADDR_RULE_PRIVACY:
1676	{
1677	/ Rule 7: Prefer public address*
1678	* Note: prefer temporary address if use_tempaddr >= 2
1679	*/
1680	int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC\|IPV6_PREFER_SRC_TMP) ?
1681	!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1682	READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= `2`;
1683	ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1684	break;
1685	}
1686	case IPV6_SADDR_RULE_ORCHID:
1687	/ Rule 8-: Prefer ORCHID vs ORCHID or*
1688	* non-ORCHID vs non-ORCHID
1689	*/
1690	ret = !(ipv6_addr_orchid(a: &score->ifa->addr) ^
1691	ipv6_addr_orchid(a: dst->addr));
1692	break;
1693	case IPV6_SADDR_RULE_PREFIX:
1694	/ Rule 8: Use longest matching prefix /
1695	ret = ipv6_addr_diff(a1: &score->ifa->addr, a2: dst->addr);
1696	if (ret > score->ifa->prefix_len)
1697	ret = score->ifa->prefix_len;
1698	score->matchlen = ret;
1699	break;
1700	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1701	case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1702	/ Optimistic addresses still have lower precedence than other*
1703	* preferred addresses.
1704	*/
1705	ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1706	break;
1707	#endif
1708	default:
1709	ret = `0`;
1710	}
1711
1712	if (ret)
1713	__set_bit(i, score->scorebits);
1714	score->rule = i;
1715	out:
1716	return ret;
1717	}
1718
1719	static int __ipv6_dev_get_saddr(struct net *net,
1720	struct ipv6_saddr_dst *dst,
1721	struct inet6_dev *idev,
1722	struct ipv6_saddr_score *scores,
1723	int hiscore_idx)
1724	{
1725	struct ipv6_saddr_score score = &scores[`1` - hiscore_idx], hiscore = &scores[hiscore_idx];
1726
1727	list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1728	int i;
1729
1730	/*
1731	* - Tentative Address (RFC2462 section 5.4)
1732	* - A tentative address is not considered
1733	* "assigned to an interface" in the traditional
1734	* sense, unless it is also flagged as optimistic.
1735	* - Candidate Source Address (section 4)
1736	* - In any case, anycast addresses, multicast
1737	* addresses, and the unspecified address MUST
1738	* NOT be included in a candidate set.
1739	*/
1740	if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1741	(!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1742	continue;
1743
1744	score->addr_type = __ipv6_addr_type(addr: &score->ifa->addr);
1745
1746	if (unlikely(score->addr_type == IPV6_ADDR_ANY \|\|
1747	score->addr_type & IPV6_ADDR_MULTICAST)) {
1748	net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1749	idev->dev->name);
1750	continue;
1751	}
1752
1753	score->rule = -`1`;
1754	bitmap_zero(dst: score->scorebits, nbits: IPV6_SADDR_RULE_MAX);
1755
1756	for (i = `0`; i < IPV6_SADDR_RULE_MAX; i++) {
1757	int minihiscore, miniscore;
1758
1759	minihiscore = ipv6_get_saddr_eval(net, score: hiscore, dst, i);
1760	miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1761
1762	if (minihiscore > miniscore) {
1763	if (i == IPV6_SADDR_RULE_SCOPE &&
1764	score->scopedist > `0`) {
1765	/*
1766	* special case:
1767	* each remaining entry
1768	* has too small (not enough)
1769	* scope, because ifa entries
1770	* are sorted by their scope
1771	* values.
1772	*/
1773	goto out;
1774	}
1775	break;
1776	} else if (minihiscore < miniscore) {
1777	swap(hiscore, score);
1778	hiscore_idx = `1` - hiscore_idx;
1779
1780	/ restore our iterator /
1781	score->ifa = hiscore->ifa;
1782
1783	break;
1784	}
1785	}
1786	}
1787	out:
1788	return hiscore_idx;
1789	}
1790
1791	static int ipv6_get_saddr_master(struct net *net,
1792	const struct net_device *dst_dev,
1793	const struct net_device *master,
1794	struct ipv6_saddr_dst *dst,
1795	struct ipv6_saddr_score *scores,
1796	int hiscore_idx)
1797	{
1798	struct inet6_dev *idev;
1799
1800	idev = __in6_dev_get(dev: dst_dev);
1801	if (idev)
1802	hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1803	scores, hiscore_idx);
1804
1805	idev = __in6_dev_get(dev: master);
1806	if (idev)
1807	hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1808	scores, hiscore_idx);
1809
1810	return hiscore_idx;
1811	}
1812
1813	int ipv6_dev_get_saddr(struct net net, const* struct net_device *dst_dev,
1814	const struct in6_addr daddr, unsigned* int prefs,
1815	struct in6_addr *saddr)
1816	{
1817	struct ipv6_saddr_score scores[`2`], *hiscore;
1818	struct ipv6_saddr_dst dst;
1819	struct inet6_dev *idev;
1820	struct net_device *dev;
1821	int dst_type;
1822	bool use_oif_addr = false;
1823	int hiscore_idx = `0`;
1824	int ret = `0`;
1825
1826	dst_type = __ipv6_addr_type(addr: daddr);
1827	dst.addr = daddr;
1828	dst.ifindex = dst_dev ? dst_dev->ifindex : `0`;
1829	dst.scope = __ipv6_addr_src_scope(type: dst_type);
1830	dst.label = ipv6_addr_label(net, addr: daddr, type: dst_type, ifindex: dst.ifindex);
1831	dst.prefs = prefs;
1832
1833	scores[hiscore_idx].rule = -`1`;
1834	scores[hiscore_idx].ifa = NULL;
1835
1836	rcu_read_lock();
1837
1838	/ Candidate Source Address (section 4)*
1839	* - multicast and link-local destination address,
1840	* the set of candidate source address MUST only
1841	* include addresses assigned to interfaces
1842	* belonging to the same link as the outgoing
1843	* interface.
1844	* (- For site-local destination addresses, the
1845	* set of candidate source addresses MUST only
1846	* include addresses assigned to interfaces
1847	* belonging to the same site as the outgoing
1848	* interface.)
1849	* - "It is RECOMMENDED that the candidate source addresses
1850	* be the set of unicast addresses assigned to the
1851	* interface that will be used to send to the destination
1852	* (the 'outgoing' interface)." (RFC 6724)
1853	*/
1854	if (dst_dev) {
1855	idev = __in6_dev_get(dev: dst_dev);
1856	if ((dst_type & IPV6_ADDR_MULTICAST) \|\|
1857	dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL \|\|
1858	(idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1859	use_oif_addr = true;
1860	}
1861	}
1862
1863	if (use_oif_addr) {
1864	if (idev)
1865	hiscore_idx = __ipv6_dev_get_saddr(net, dst: &dst, idev, scores, hiscore_idx);
1866	} else {
1867	const struct net_device *master;
1868	int master_idx = `0`;
1869
1870	/ if dst_dev exists and is enslaved to an L3 device, then*
1871	* prefer addresses from dst_dev and then the master over
1872	* any other enslaved devices in the L3 domain.
1873	*/
1874	master = l3mdev_master_dev_rcu(dev: dst_dev);
1875	if (master) {
1876	master_idx = master->ifindex;
1877
1878	hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1879	master, dst: &dst,
1880	scores, hiscore_idx);
1881
1882	if (scores[hiscore_idx].ifa &&
1883	scores[hiscore_idx].scopedist >= `0`)
1884	goto out;
1885	}
1886
1887	for_each_netdev_rcu(net, dev) {
1888	/ only consider addresses on devices in the*
1889	* same L3 domain
1890	*/
1891	if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1892	continue;
1893	idev = __in6_dev_get(dev);
1894	if (!idev)
1895	continue;
1896	hiscore_idx = __ipv6_dev_get_saddr(net, dst: &dst, idev, scores, hiscore_idx);
1897	}
1898	}
1899
1900	out:
1901	hiscore = &scores[hiscore_idx];
1902	if (!hiscore->ifa)
1903	ret = -EADDRNOTAVAIL;
1904	else
1905	*saddr = hiscore->ifa->addr;
1906
1907	rcu_read_unlock();
1908	return ret;
1909	}
1910	EXPORT_SYMBOL(ipv6_dev_get_saddr);
1911
1912	static int __ipv6_get_lladdr(struct inet6_dev idev, struct* in6_addr *addr,
1913	u32 banned_flags)
1914	{
1915	struct inet6_ifaddr *ifp;
1916	int err = -EADDRNOTAVAIL;
1917
1918	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1919	if (ifp->scope > IFA_LINK)
1920	break;
1921	if (ifp->scope == IFA_LINK &&
1922	!(ifp->flags & banned_flags)) {
1923	*addr = ifp->addr;
1924	err = `0`;
1925	break;
1926	}
1927	}
1928	return err;
1929	}
1930
1931	int ipv6_get_lladdr(struct net_device dev, struct* in6_addr *addr,
1932	u32 banned_flags)
1933	{
1934	struct inet6_dev *idev;
1935	int err = -EADDRNOTAVAIL;
1936
1937	rcu_read_lock();
1938	idev = __in6_dev_get(dev);
1939	if (idev) {
1940	read_lock_bh(&idev->lock);
1941	err = __ipv6_get_lladdr(idev, addr, banned_flags);
1942	read_unlock_bh(&idev->lock);
1943	}
1944	rcu_read_unlock();
1945	return err;
1946	}
1947
1948	static int ipv6_count_addresses(const struct inet6_dev *idev)
1949	{
1950	const struct inet6_ifaddr *ifp;
1951	int cnt = `0`;
1952
1953	rcu_read_lock();
1954	list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1955	cnt++;
1956	rcu_read_unlock();
1957	return cnt;
1958	}
1959
1960	int ipv6_chk_addr(struct net net, const* struct in6_addr *addr,
1961	const struct net_device dev, int* strict)
1962	{
1963	return ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check: !dev,
1964	strict, IFA_F_TENTATIVE);
1965	}
1966	EXPORT_SYMBOL(ipv6_chk_addr);
1967
1968	/ device argument is used to find the L3 domain of interest. If*
1969	* skip_dev_check is set, then the ifp device is not checked against
1970	* the passed in dev argument. So the 2 cases for addresses checks are:
1971	* 1. does the address exist in the L3 domain that dev is part of
1972	* (skip_dev_check = true), or
1973	*
1974	* 2. does the address exist on the specific device
1975	* (skip_dev_check = false)
1976	*/
1977	static struct net_device *
1978	__ipv6_chk_addr_and_flags(struct net net, const* struct in6_addr *addr,
1979	const struct net_device *dev, bool skip_dev_check,
1980	int strict, u32 banned_flags)
1981	{
1982	unsigned int hash = inet6_addr_hash(net, addr);
1983	struct net_device l3mdev, ndev;
1984	struct inet6_ifaddr *ifp;
1985	u32 ifp_flags;
1986
1987	rcu_read_lock();
1988
1989	l3mdev = l3mdev_master_dev_rcu(dev);
1990	if (skip_dev_check)
1991	dev = NULL;
1992
1993	hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1994	ndev = ifp->idev->dev;
1995
1996	if (l3mdev_master_dev_rcu(dev: ndev) != l3mdev)
1997	continue;
1998
1999	/ Decouple optimistic from tentative for evaluation here.*
2000	* Ban optimistic addresses explicitly, when required.
2001	*/
2002	ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
2003	? (ifp->flags&~IFA_F_TENTATIVE)
2004	: ifp->flags;
2005	if (ipv6_addr_equal(a1: &ifp->addr, a2: addr) &&
2006	!(ifp_flags&banned_flags) &&
2007	(!dev \|\| ndev == dev \|\|
2008	!(ifp->scope&(IFA_LINK\|IFA_HOST) \|\| strict))) {
2009	rcu_read_unlock();
2010	return ndev;
2011	}
2012	}
2013
2014	rcu_read_unlock();
2015	return NULL;
2016	}
2017
2018	int ipv6_chk_addr_and_flags(struct net net, const* struct in6_addr *addr,
2019	const struct net_device *dev, bool skip_dev_check,
2020	int strict, u32 banned_flags)
2021	{
2022	return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2023	strict, banned_flags) ? `1` : `0`;
2024	}
2025	EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2026
2027
2028	/ Compares an address/prefix_len with addresses on device @dev.*
2029	* If one is found it returns true.
2030	*/
2031	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2032	const unsigned int prefix_len, struct net_device *dev)
2033	{
2034	const struct inet6_ifaddr *ifa;
2035	const struct inet6_dev *idev;
2036	bool ret = false;
2037
2038	rcu_read_lock();
2039	idev = __in6_dev_get(dev);
2040	if (idev) {
2041	list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2042	ret = ipv6_prefix_equal(addr1: addr, addr2: &ifa->addr, prefixlen: prefix_len);
2043	if (ret)
2044	break;
2045	}
2046	}
2047	rcu_read_unlock();
2048
2049	return ret;
2050	}
2051	EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2052
2053	int ipv6_chk_prefix(const struct in6_addr addr, struct* net_device *dev)
2054	{
2055	const struct inet6_ifaddr *ifa;
2056	const struct inet6_dev *idev;
2057	int onlink;
2058
2059	onlink = `0`;
2060	rcu_read_lock();
2061	idev = __in6_dev_get(dev);
2062	if (idev) {
2063	list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2064	onlink = ipv6_prefix_equal(addr1: addr, addr2: &ifa->addr,
2065	prefixlen: ifa->prefix_len);
2066	if (onlink)
2067	break;
2068	}
2069	}
2070	rcu_read_unlock();
2071	return onlink;
2072	}
2073	EXPORT_SYMBOL(ipv6_chk_prefix);
2074
2075	/**
2076	* ipv6_dev_find - find the first device with a given source address.
2077	* @net: the net namespace
2078	* @addr: the source address
2079	* @dev: used to find the L3 domain of interest
2080	*
2081	* The caller should be protected by RCU, or RTNL.
2082	*/
2083	struct net_device ipv6_dev_find(struct* net net, const* struct in6_addr *addr,
2084	struct net_device *dev)
2085	{
2086	return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check: !dev, strict: `1`,
2087	IFA_F_TENTATIVE);
2088	}
2089	EXPORT_SYMBOL(ipv6_dev_find);
2090
2091	struct inet6_ifaddr ipv6_get_ifaddr(struct* net net, const* struct in6_addr *addr,
2092	struct net_device dev, int* strict)
2093	{
2094	unsigned int hash = inet6_addr_hash(net, addr);
2095	struct inet6_ifaddr ifp, result = NULL;
2096
2097	rcu_read_lock();
2098	hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2099	if (ipv6_addr_equal(a1: &ifp->addr, a2: addr)) {
2100	if (!dev \|\| ifp->idev->dev == dev \|\|
2101	!(ifp->scope&(IFA_LINK\|IFA_HOST) \|\| strict)) {
2102	if (in6_ifa_hold_safe(ifp)) {
2103	result = ifp;
2104	break;
2105	}
2106	}
2107	}
2108	}
2109	rcu_read_unlock();
2110
2111	return result;
2112	}
2113
2114	/ Gets referenced address, destroys ifaddr /
2115
2116	static void addrconf_dad_stop(struct inet6_ifaddr ifp, int* dad_failed)
2117	{
2118	if (dad_failed)
2119	ifp->flags \|= IFA_F_DADFAILED;
2120
2121	if (ifp->flags&IFA_F_TEMPORARY) {
2122	struct inet6_ifaddr *ifpub;
2123	spin_lock_bh(lock: &ifp->lock);
2124	ifpub = ifp->ifpub;
2125	if (ifpub) {
2126	in6_ifa_hold(ifp: ifpub);
2127	spin_unlock_bh(lock: &ifp->lock);
2128	ipv6_create_tempaddr(ifp: ifpub, block: true);
2129	in6_ifa_put(ifp: ifpub);
2130	} else {
2131	spin_unlock_bh(lock: &ifp->lock);
2132	}
2133	ipv6_del_addr(ifp);
2134	} else if (ifp->flags&IFA_F_PERMANENT \|\| !dad_failed) {
2135	spin_lock_bh(lock: &ifp->lock);
2136	addrconf_del_dad_work(ifp);
2137	ifp->flags \|= IFA_F_TENTATIVE;
2138	if (dad_failed)
2139	ifp->flags &= ~IFA_F_OPTIMISTIC;
2140	spin_unlock_bh(lock: &ifp->lock);
2141	if (dad_failed)
2142	ipv6_ifa_notify(event: `0`, ifa: ifp);
2143	in6_ifa_put(ifp);
2144	} else {
2145	ipv6_del_addr(ifp);
2146	}
2147	}
2148
2149	static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2150	{
2151	int err = -ENOENT;
2152
2153	spin_lock_bh(lock: &ifp->lock);
2154	if (ifp->state == INET6_IFADDR_STATE_DAD) {
2155	ifp->state = INET6_IFADDR_STATE_POSTDAD;
2156	err = `0`;
2157	}
2158	spin_unlock_bh(lock: &ifp->lock);
2159
2160	return err;
2161	}
2162
2163	void addrconf_dad_failure(struct sk_buff skb, struct* inet6_ifaddr *ifp)
2164	{
2165	struct inet6_dev *idev = ifp->idev;
2166	struct net *net = dev_net(dev: idev->dev);
2167	int max_addresses;
2168
2169	if (addrconf_dad_end(ifp)) {
2170	in6_ifa_put(ifp);
2171	return;
2172	}
2173
2174	net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2175	ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2176
2177	spin_lock_bh(lock: &ifp->lock);
2178
2179	if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2180	struct in6_addr new_addr;
2181	struct inet6_ifaddr *ifp2;
2182	int retries = ifp->stable_privacy_retry + `1`;
2183	struct ifa6_config cfg = {
2184	.pfx = &new_addr,
2185	.plen = ifp->prefix_len,
2186	.ifa_flags = ifp->flags,
2187	.valid_lft = ifp->valid_lft,
2188	.preferred_lft = ifp->prefered_lft,
2189	.scope = ifp->scope,
2190	};
2191
2192	if (retries > net->ipv6.sysctl.idgen_retries) {
2193	net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2194	ifp->idev->dev->name);
2195	goto errdad;
2196	}
2197
2198	new_addr = ifp->addr;
2199	if (ipv6_generate_stable_address(addr: &new_addr, dad_count: retries,
2200	idev))
2201	goto errdad;
2202
2203	spin_unlock_bh(lock: &ifp->lock);
2204
2205	max_addresses = READ_ONCE(idev->cnf.max_addresses);
2206	if (max_addresses &&
2207	ipv6_count_addresses(idev) >= max_addresses)
2208	goto lock_errdad;
2209
2210	net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2211	ifp->idev->dev->name);
2212
2213	ifp2 = ipv6_add_addr(idev, cfg: &cfg, can_block: false, NULL);
2214	if (IS_ERR(ptr: ifp2))
2215	goto lock_errdad;
2216
2217	spin_lock_bh(lock: &ifp2->lock);
2218	ifp2->stable_privacy_retry = retries;
2219	ifp2->state = INET6_IFADDR_STATE_PREDAD;
2220	spin_unlock_bh(lock: &ifp2->lock);
2221
2222	addrconf_mod_dad_work(ifp: ifp2, delay: net->ipv6.sysctl.idgen_delay);
2223	in6_ifa_put(ifp: ifp2);
2224	lock_errdad:
2225	spin_lock_bh(lock: &ifp->lock);
2226	}
2227
2228	errdad:
2229	/ transition from _POSTDAD to _ERRDAD /
2230	ifp->state = INET6_IFADDR_STATE_ERRDAD;
2231	spin_unlock_bh(lock: &ifp->lock);
2232
2233	addrconf_mod_dad_work(ifp, delay: `0`);
2234	in6_ifa_put(ifp);
2235	}
2236
2237	/ Join to solicited addr multicast group. /
2238	void addrconf_join_solict(struct net_device dev, const* struct in6_addr *addr)
2239	{
2240	struct in6_addr maddr;
2241
2242	if (READ_ONCE(dev->flags) & (IFF_LOOPBACK \| IFF_NOARP))
2243	return;
2244
2245	addrconf_addr_solict_mult(addr, solicited: &maddr);
2246	ipv6_dev_mc_inc(dev, addr: &maddr);
2247	}
2248
2249	void addrconf_leave_solict(struct inet6_dev idev, const* struct in6_addr *addr)
2250	{
2251	struct in6_addr maddr;
2252
2253	if (READ_ONCE(idev->dev->flags) & (IFF_LOOPBACK \| IFF_NOARP))
2254	return;
2255
2256	addrconf_addr_solict_mult(addr, solicited: &maddr);
2257	__ipv6_dev_mc_dec(idev, addr: &maddr);
2258	}
2259
2260	static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2261	{
2262	struct in6_addr addr;
2263
2264	if (ifp->prefix_len >= `127`) / RFC 6164 /
2265	return;
2266	ipv6_addr_prefix(pfx: &addr, addr: &ifp->addr, plen: ifp->prefix_len);
2267	if (ipv6_addr_any(a: &addr))
2268	return;
2269	__ipv6_dev_ac_inc(idev: ifp->idev, addr: &addr);
2270	}
2271
2272	static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2273	{
2274	struct in6_addr addr;
2275
2276	if (ifp->prefix_len >= `127`) / RFC 6164 /
2277	return;
2278	ipv6_addr_prefix(pfx: &addr, addr: &ifp->addr, plen: ifp->prefix_len);
2279	if (ipv6_addr_any(a: &addr))
2280	return;
2281	__ipv6_dev_ac_dec(idev: ifp->idev, addr: &addr);
2282	}
2283
2284	static int addrconf_ifid_6lowpan(u8 eui, struct* net_device *dev)
2285	{
2286	switch (dev->addr_len) {
2287	case ETH_ALEN:
2288	memcpy(to: eui, from: dev->dev_addr, len: `3`);
2289	eui[`3`] = `0xFF`;
2290	eui[`4`] = `0xFE`;
2291	memcpy(to: eui + `5`, from: dev->dev_addr + `3`, len: `3`);
2292	break;
2293	case EUI64_ADDR_LEN:
2294	memcpy(to: eui, from: dev->dev_addr, EUI64_ADDR_LEN);
2295	eui[`0`] ^= `2`;
2296	break;
2297	default:
2298	return -`1`;
2299	}
2300
2301	return `0`;
2302	}
2303
2304	static int addrconf_ifid_ieee1394(u8 eui, struct* net_device *dev)
2305	{
2306	const union fwnet_hwaddr *ha;
2307
2308	if (dev->addr_len != FWNET_ALEN)
2309	return -`1`;
2310
2311	ha = (const union fwnet_hwaddr *)dev->dev_addr;
2312
2313	memcpy(to: eui, from: &ha->uc.uniq_id, len: sizeof(ha->uc.uniq_id));
2314	eui[`0`] ^= `2`;
2315	return `0`;
2316	}
2317
2318	static int addrconf_ifid_arcnet(u8 eui, struct* net_device *dev)
2319	{
2320	/ XXX: inherit EUI-64 from other interface -- yoshfuji /
2321	if (dev->addr_len != ARCNET_ALEN)
2322	return -`1`;
2323	memset(s: eui, c: `0`, n: `7`);
2324	eui[`7`] = (u8 )dev->dev_addr;
2325	return `0`;
2326	}
2327
2328	static int addrconf_ifid_infiniband(u8 eui, struct* net_device *dev)
2329	{
2330	if (dev->addr_len != INFINIBAND_ALEN)
2331	return -`1`;
2332	memcpy(to: eui, from: dev->dev_addr + `12`, len: `8`);
2333	eui[`0`] \|= `2`;
2334	return `0`;
2335	}
2336
2337	static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2338	{
2339	if (addr == `0`)
2340	return -`1`;
2341	eui[`0`] = (ipv4_is_zeronet(addr) \|\| ipv4_is_private_10(addr) \|\|
2342	ipv4_is_loopback(addr) \|\| ipv4_is_linklocal_169(addr) \|\|
2343	ipv4_is_private_172(addr) \|\| ipv4_is_test_192(addr) \|\|
2344	ipv4_is_anycast_6to4(addr) \|\| ipv4_is_private_192(addr) \|\|
2345	ipv4_is_test_198(addr) \|\| ipv4_is_multicast(addr) \|\|
2346	ipv4_is_lbcast(addr)) ? `0x00` : `0x02`;
2347	eui[`1`] = `0`;
2348	eui[`2`] = `0x5E`;
2349	eui[`3`] = `0xFE`;
2350	memcpy(to: eui + `4`, from: &addr, len: `4`);
2351	return `0`;
2352	}
2353
2354	static int addrconf_ifid_sit(u8 eui, struct* net_device *dev)
2355	{
2356	if (dev->priv_flags & IFF_ISATAP)
2357	return __ipv6_isatap_ifid(eui, addr: (__be32 )dev->dev_addr);
2358	return -`1`;
2359	}
2360
2361	static int addrconf_ifid_gre(u8 eui, struct* net_device *dev)
2362	{
2363	return __ipv6_isatap_ifid(eui, addr: (__be32 )dev->dev_addr);
2364	}
2365
2366	static int addrconf_ifid_ip6tnl(u8 eui, struct* net_device *dev)
2367	{
2368	memcpy(to: eui, from: dev->perm_addr, len: `3`);
2369	memcpy(to: eui + `5`, from: dev->perm_addr + `3`, len: `3`);
2370	eui[`3`] = `0xFF`;
2371	eui[`4`] = `0xFE`;
2372	eui[`0`] ^= `2`;
2373	return `0`;
2374	}
2375
2376	static int ipv6_generate_eui64(u8 eui, struct* net_device *dev)
2377	{
2378	switch (dev->type) {
2379	case ARPHRD_ETHER:
2380	case ARPHRD_FDDI:
2381	return addrconf_ifid_eui48(eui, dev);
2382	case ARPHRD_ARCNET:
2383	return addrconf_ifid_arcnet(eui, dev);
2384	case ARPHRD_INFINIBAND:
2385	return addrconf_ifid_infiniband(eui, dev);
2386	case ARPHRD_SIT:
2387	return addrconf_ifid_sit(eui, dev);
2388	case ARPHRD_IPGRE:
2389	case ARPHRD_TUNNEL:
2390	return addrconf_ifid_gre(eui, dev);
2391	case ARPHRD_6LOWPAN:
2392	return addrconf_ifid_6lowpan(eui, dev);
2393	case ARPHRD_IEEE1394:
2394	return addrconf_ifid_ieee1394(eui, dev);
2395	case ARPHRD_TUNNEL6:
2396	case ARPHRD_IP6GRE:
2397	case ARPHRD_RAWIP:
2398	return addrconf_ifid_ip6tnl(eui, dev);
2399	}
2400	return -`1`;
2401	}
2402
2403	static int ipv6_inherit_eui64(u8 eui, struct* inet6_dev *idev)
2404	{
2405	int err = -`1`;
2406	struct inet6_ifaddr *ifp;
2407
2408	read_lock_bh(&idev->lock);
2409	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2410	if (ifp->scope > IFA_LINK)
2411	break;
2412	if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2413	memcpy(to: eui, from: ifp->addr.s6_addr+`8`, len: `8`);
2414	err = `0`;
2415	break;
2416	}
2417	}
2418	read_unlock_bh(&idev->lock);
2419	return err;
2420	}
2421
2422	/ Generation of a randomized Interface Identifier*
2423	* draft-ietf-6man-rfc4941bis, Section 3.3.1
2424	*/
2425
2426	static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2427	{
2428	regen:
2429	get_random_bytes(buf: &addr->s6_addr[`8`], len: `8`);
2430
2431	/ <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:*
2432	* check if generated address is not inappropriate:
2433	*
2434	* - Reserved IPv6 Interface Identifiers
2435	* - XXX: already assigned to an address on the device
2436	*/
2437
2438	/ Subnet-router anycast: 0000:0000:0000:0000 /
2439	if (!(addr->s6_addr32[`2`] \| addr->s6_addr32[`3`]))
2440	goto regen;
2441
2442	/ IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212*
2443	* Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2444	* IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2445	*/
2446	if (ntohl(addr->s6_addr32[`2`]) == `0x02005eff` &&
2447	(ntohl(addr->s6_addr32[`3`]) & `0Xff000000`) == `0xfe000000`)
2448	goto regen;
2449
2450	/ Reserved subnet anycast addresses /
2451	if (ntohl(addr->s6_addr32[`2`]) == `0xfdffffff` &&
2452	ntohl(addr->s6_addr32[`3`]) >= `0Xffffff80`)
2453	goto regen;
2454	}
2455
2456	/*
2457	* Add prefix route.
2458	*/
2459
2460	static void
2461	addrconf_prefix_route(struct in6_addr pfx, int* plen, u32 metric,
2462	struct net_device dev, unsigned* long expires,
2463	u32 flags, gfp_t gfp_flags)
2464	{
2465	struct fib6_config cfg = {
2466	.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2467	.fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2468	.fc_ifindex = dev->ifindex,
2469	.fc_expires = expires,
2470	.fc_dst_len = plen,
2471	.fc_flags = RTF_UP \| flags,
2472	.fc_nlinfo.nl_net = dev_net(dev),
2473	.fc_protocol = RTPROT_KERNEL,
2474	.fc_type = RTN_UNICAST,
2475	};
2476
2477	cfg.fc_dst = *pfx;
2478
2479	/ Prevent useless cloning on PtP SIT.*
2480	This thing is done here expecting that the whole
2481	class of non-broadcast devices need not cloning.
2482	*/
2483	#if IS_ENABLED(CONFIG_IPV6_SIT)
2484	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2485	cfg.fc_flags \|= RTF_NONEXTHOP;
2486	#endif
2487
2488	ip6_route_add(cfg: &cfg, gfp_flags, NULL);
2489	}
2490
2491
2492	static struct fib6_info addrconf_get_prefix_route(const* struct in6_addr *pfx,
2493	int plen,
2494	const struct net_device *dev,
2495	u32 flags, u32 noflags,
2496	bool no_gw)
2497	{
2498	struct fib6_node *fn;
2499	struct fib6_info *rt = NULL;
2500	struct fib6_table *table;
2501	u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2502
2503	table = fib6_get_table(net: dev_net(dev), id: tb_id);
2504	if (!table)
2505	return NULL;
2506
2507	rcu_read_lock();
2508	fn = fib6_locate(root: &table->tb6_root, daddr: pfx, dst_len: plen, NULL, src_len: `0`, exact_match: true);
2509	if (!fn)
2510	goto out;
2511
2512	for_each_fib6_node_rt_rcu(fn) {
2513	/ prefix routes only use builtin fib6_nh /
2514	if (rt->nh)
2515	continue;
2516
2517	if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2518	continue;
2519	if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2520	continue;
2521	if ((rt->fib6_flags & flags) != flags)
2522	continue;
2523	if ((rt->fib6_flags & noflags) != `0`)
2524	continue;
2525	if (!fib6_info_hold_safe(f6i: rt))
2526	continue;
2527	break;
2528	}
2529	out:
2530	rcu_read_unlock();
2531	return rt;
2532	}
2533
2534
2535	/ Create "default" multicast route to the interface /
2536
2537	static void addrconf_add_mroute(struct net_device *dev)
2538	{
2539	struct fib6_config cfg = {
2540	.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2541	.fc_metric = IP6_RT_PRIO_ADDRCONF,
2542	.fc_ifindex = dev->ifindex,
2543	.fc_dst_len = `8`,
2544	.fc_flags = RTF_UP,
2545	.fc_type = RTN_MULTICAST,
2546	.fc_nlinfo.nl_net = dev_net(dev),
2547	.fc_protocol = RTPROT_KERNEL,
2548	};
2549
2550	ipv6_addr_set(addr: &cfg.fc_dst, htonl(`0xFF000000`), w2: `0`, w3: `0`, w4: `0`);
2551
2552	ip6_route_add(cfg: &cfg, GFP_KERNEL, NULL);
2553	}
2554
2555	static struct inet6_dev addrconf_add_dev(struct* net_device *dev)
2556	{
2557	struct inet6_dev *idev;
2558
2559	ASSERT_RTNL();
2560
2561	idev = ipv6_find_idev(dev);
2562	if (IS_ERR(ptr: idev))
2563	return idev;
2564
2565	if (idev->cnf.disable_ipv6)
2566	return ERR_PTR(error: -EACCES);
2567
2568	/ Add default multicast route /
2569	if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2570	addrconf_add_mroute(dev);
2571
2572	return idev;
2573	}
2574
2575	static void delete_tempaddrs(struct inet6_dev *idev,
2576	struct inet6_ifaddr *ifp)
2577	{
2578	struct inet6_ifaddr ift, tmp;
2579
2580	write_lock_bh(&idev->lock);
2581	list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) {
2582	if (ift->ifpub != ifp)
2583	continue;
2584
2585	in6_ifa_hold(ifp: ift);
2586	write_unlock_bh(&idev->lock);
2587	ipv6_del_addr(ifp: ift);
2588	write_lock_bh(&idev->lock);
2589	}
2590	write_unlock_bh(&idev->lock);
2591	}
2592
2593	static void manage_tempaddrs(struct inet6_dev *idev,
2594	struct inet6_ifaddr *ifp,
2595	__u32 valid_lft, __u32 prefered_lft,
2596	bool create, unsigned long now)
2597	{
2598	u32 flags;
2599	struct inet6_ifaddr *ift;
2600
2601	read_lock_bh(&idev->lock);
2602	/ update all temporary addresses in the list /
2603	list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2604	int age, max_valid, max_prefered;
2605
2606	if (ifp != ift->ifpub)
2607	continue;
2608
2609	/ RFC 4941 section 3.3:*
2610	* If a received option will extend the lifetime of a public
2611	* address, the lifetimes of temporary addresses should
2612	* be extended, subject to the overall constraint that no
2613	* temporary addresses should ever remain "valid" or "preferred"
2614	* for a time longer than (TEMP_VALID_LIFETIME) or
2615	* (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2616	*/
2617	age = (now - ift->cstamp) / HZ;
2618	max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2619	if (max_valid < `0`)
2620	max_valid = `0`;
2621
2622	max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2623	idev->desync_factor - age;
2624	if (max_prefered < `0`)
2625	max_prefered = `0`;
2626
2627	if (valid_lft > max_valid)
2628	valid_lft = max_valid;
2629
2630	if (prefered_lft > max_prefered)
2631	prefered_lft = max_prefered;
2632
2633	spin_lock(lock: &ift->lock);
2634	flags = ift->flags;
2635	ift->valid_lft = valid_lft;
2636	ift->prefered_lft = prefered_lft;
2637	ift->tstamp = now;
2638	if (prefered_lft > `0`)
2639	ift->flags &= ~IFA_F_DEPRECATED;
2640
2641	spin_unlock(lock: &ift->lock);
2642	if (!(flags&IFA_F_TENTATIVE))
2643	ipv6_ifa_notify(event: `0`, ifa: ift);
2644	}
2645
2646	/ Also create a temporary address if it's enabled but no temporary*
2647	* address currently exists.
2648	* However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2649	* as part of cleanup (ie. deleting the mngtmpaddr).
2650	* We don't want that to result in creating a new temporary ip address.
2651	*/
2652	if (list_empty(head: &idev->tempaddr_list) && (valid_lft \|\| prefered_lft))
2653	create = true;
2654
2655	if (create && READ_ONCE(idev->cnf.use_tempaddr) > `0`) {
2656	/ When a new public address is created as described*
2657	* in [ADDRCONF], also create a new temporary address.
2658	*/
2659	read_unlock_bh(&idev->lock);
2660	ipv6_create_tempaddr(ifp, block: false);
2661	} else {
2662	read_unlock_bh(&idev->lock);
2663	}
2664	}
2665
2666	static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2667	{
2668	return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY \|\|
2669	idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2670	}
2671
2672	int addrconf_prefix_rcv_add_addr(struct net net, struct* net_device *dev,
2673	const struct prefix_info *pinfo,
2674	struct inet6_dev *in6_dev,
2675	const struct in6_addr addr, int* addr_type,
2676	u32 addr_flags, bool sllao, bool tokenized,
2677	__u32 valid_lft, u32 prefered_lft)
2678	{
2679	struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, strict: `1`);
2680	int create = `0`, update_lft = `0`;
2681
2682	if (!ifp && valid_lft) {
2683	int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2684	struct ifa6_config cfg = {
2685	.pfx = addr,
2686	.plen = pinfo->prefix_len,
2687	.ifa_flags = addr_flags,
2688	.valid_lft = valid_lft,
2689	.preferred_lft = prefered_lft,
2690	.scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2691	.ifa_proto = IFAPROT_KERNEL_RA
2692	};
2693
2694	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2695	if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) \|\|
2696	READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2697	!net->ipv6.devconf_all->forwarding && sllao)
2698	cfg.ifa_flags \|= IFA_F_OPTIMISTIC;
2699	#endif
2700
2701	/ Do not allow to create too much of autoconfigured*
2702	* addresses; this would be too easy way to crash kernel.
2703	*/
2704	if (!max_addresses \|\|
2705	ipv6_count_addresses(idev: in6_dev) < max_addresses)
2706	ifp = ipv6_add_addr(idev: in6_dev, cfg: &cfg, can_block: false, NULL);
2707
2708	if (IS_ERR_OR_NULL(ptr: ifp))
2709	return -`1`;
2710
2711	create = `1`;
2712	spin_lock_bh(lock: &ifp->lock);
2713	ifp->flags \|= IFA_F_MANAGETEMPADDR;
2714	ifp->cstamp = jiffies;
2715	ifp->tokenized = tokenized;
2716	spin_unlock_bh(lock: &ifp->lock);
2717	addrconf_dad_start(ifp);
2718	}
2719
2720	if (ifp) {
2721	u32 flags;
2722	unsigned long now;
2723	u32 stored_lft;
2724
2725	/ update lifetime (RFC2462 5.5.3 e) /
2726	spin_lock_bh(lock: &ifp->lock);
2727	now = jiffies;
2728	if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2729	stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2730	else
2731	stored_lft = `0`;
2732
2733	/ RFC4862 Section 5.5.3e:*
2734	* "Note that the preferred lifetime of the
2735	* corresponding address is always reset to
2736	* the Preferred Lifetime in the received
2737	* Prefix Information option, regardless of
2738	* whether the valid lifetime is also reset or
2739	* ignored."
2740	*
2741	* So we should always update prefered_lft here.
2742	*/
2743	update_lft = !create && stored_lft;
2744
2745	if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2746	const u32 minimum_lft = min_t(u32,
2747	stored_lft, MIN_VALID_LIFETIME);
2748	valid_lft = max(valid_lft, minimum_lft);
2749	}
2750
2751	if (update_lft) {
2752	ifp->valid_lft = valid_lft;
2753	ifp->prefered_lft = prefered_lft;
2754	WRITE_ONCE(ifp->tstamp, now);
2755	flags = ifp->flags;
2756	ifp->flags &= ~IFA_F_DEPRECATED;
2757	spin_unlock_bh(lock: &ifp->lock);
2758
2759	if (!(flags&IFA_F_TENTATIVE))
2760	ipv6_ifa_notify(event: `0`, ifa: ifp);
2761	} else
2762	spin_unlock_bh(lock: &ifp->lock);
2763
2764	manage_tempaddrs(idev: in6_dev, ifp, valid_lft, prefered_lft,
2765	create, now);
2766
2767	in6_ifa_put(ifp);
2768	addrconf_verify(net);
2769	}
2770
2771	return `0`;
2772	}
2773	EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2774
2775	void addrconf_prefix_rcv(struct net_device dev, u8 opt, int len, bool sllao)
2776	{
2777	struct prefix_info *pinfo;
2778	struct fib6_table *table;
2779	__u32 valid_lft;
2780	__u32 prefered_lft;
2781	int addr_type, err;
2782	u32 addr_flags = `0`;
2783	struct inet6_dev *in6_dev;
2784	struct net *net = dev_net(dev);
2785	bool ignore_autoconf = false;
2786
2787	pinfo = (struct prefix_info *) opt;
2788
2789	if (len < sizeof(struct prefix_info)) {
2790	netdev_dbg(dev, "addrconf: prefix option too short\n");
2791	return;
2792	}
2793
2794	/*
2795	* Validation checks ([ADDRCONF], page 19)
2796	*/
2797
2798	addr_type = ipv6_addr_type(addr: &pinfo->prefix);
2799
2800	if (addr_type & (IPV6_ADDR_MULTICAST\|IPV6_ADDR_LINKLOCAL))
2801	return;
2802
2803	valid_lft = ntohl(pinfo->valid);
2804	prefered_lft = ntohl(pinfo->prefered);
2805
2806	if (prefered_lft > valid_lft) {
2807	net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2808	return;
2809	}
2810
2811	in6_dev = in6_dev_get(dev);
2812
2813	if (!in6_dev) {
2814	net_dbg_ratelimited("addrconf: device %s not configured\n",
2815	dev->name);
2816	return;
2817	}
2818
2819	if (valid_lft != `0` && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2820	goto put;
2821
2822	/*
2823	* Two things going on here:
2824	* 1) Add routes for on-link prefixes
2825	* 2) Configure prefixes with the auto flag set
2826	*/
2827
2828	if (pinfo->onlink) {
2829	struct fib6_info *rt;
2830	unsigned long rt_expires;
2831
2832	/ Avoid arithmetic overflow. Really, we could*
2833	* save rt_expires in seconds, likely valid_lft,
2834	* but it would require division in fib gc, that it
2835	* not good.
2836	*/
2837	if (HZ > USER_HZ)
2838	rt_expires = addrconf_timeout_fixup(timeout: valid_lft, HZ);
2839	else
2840	rt_expires = addrconf_timeout_fixup(timeout: valid_lft, USER_HZ);
2841
2842	if (addrconf_finite_timeout(timeout: rt_expires))
2843	rt_expires *= HZ;
2844
2845	rt = addrconf_get_prefix_route(pfx: &pinfo->prefix,
2846	plen: pinfo->prefix_len,
2847	dev,
2848	RTF_ADDRCONF \| RTF_PREFIX_RT,
2849	RTF_DEFAULT, no_gw: true);
2850
2851	if (rt) {
2852	/ Autoconf prefix route /
2853	if (valid_lft == `0`) {
2854	ip6_del_rt(net, f6i: rt, skip_notify: false);
2855	rt = NULL;
2856	} else {
2857	table = rt->fib6_table;
2858	spin_lock_bh(lock: &table->tb6_lock);
2859
2860	if (addrconf_finite_timeout(timeout: rt_expires)) {
2861	/ not infinity /
2862	fib6_set_expires(f6i: rt, expires: jiffies + rt_expires);
2863	fib6_add_gc_list(f6i: rt);
2864	} else {
2865	fib6_clean_expires(f6i: rt);
2866	fib6_remove_gc_list(f6i: rt);
2867	}
2868
2869	spin_unlock_bh(lock: &table->tb6_lock);
2870	}
2871	} else if (valid_lft) {
2872	clock_t expires = `0`;
2873	int flags = RTF_ADDRCONF \| RTF_PREFIX_RT;
2874	if (addrconf_finite_timeout(timeout: rt_expires)) {
2875	/ not infinity /
2876	flags \|= RTF_EXPIRES;
2877	expires = jiffies_to_clock_t(x: rt_expires);
2878	}
2879	addrconf_prefix_route(pfx: &pinfo->prefix, plen: pinfo->prefix_len,
2880	metric: `0`, dev, expires, flags,
2881	GFP_ATOMIC);
2882	}
2883	fib6_info_release(f6i: rt);
2884	}
2885
2886	/ Try to figure out our local address for this prefix /
2887
2888	ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd;
2889	if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) {
2890	struct in6_addr addr;
2891	bool tokenized = false, dev_addr_generated = false;
2892
2893	if (pinfo->prefix_len == `64`) {
2894	memcpy(to: &addr, from: &pinfo->prefix, len: `8`);
2895
2896	if (!ipv6_addr_any(a: &in6_dev->token)) {
2897	read_lock_bh(&in6_dev->lock);
2898	memcpy(to: addr.s6_addr + `8`,
2899	from: in6_dev->token.s6_addr + `8`, len: `8`);
2900	read_unlock_bh(&in6_dev->lock);
2901	tokenized = true;
2902	} else if (is_addr_mode_generate_stable(idev: in6_dev) &&
2903	!ipv6_generate_stable_address(addr: &addr, dad_count: `0`,
2904	idev: in6_dev)) {
2905	addr_flags \|= IFA_F_STABLE_PRIVACY;
2906	goto ok;
2907	} else if (ipv6_generate_eui64(eui: addr.s6_addr + `8`, dev) &&
2908	ipv6_inherit_eui64(eui: addr.s6_addr + `8`, idev: in6_dev)) {
2909	goto put;
2910	} else {
2911	dev_addr_generated = true;
2912	}
2913	goto ok;
2914	}
2915	net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2916	pinfo->prefix_len);
2917	goto put;
2918
2919	ok:
2920	err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2921	&addr, addr_type,
2922	addr_flags, sllao,
2923	tokenized, valid_lft,
2924	prefered_lft);
2925	if (err)
2926	goto put;
2927
2928	/ Ignore error case here because previous prefix add addr was*
2929	* successful which will be notified.
2930	*/
2931	ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, addr: &addr,
2932	addr_type, addr_flags, sllao,
2933	tokenized, valid_lft,
2934	prefered_lft,
2935	dev_addr_generated);
2936	}
2937	inet6_prefix_notify(RTM_NEWPREFIX, idev: in6_dev, pinfo);
2938	put:
2939	in6_dev_put(idev: in6_dev);
2940	}
2941
2942	static int addrconf_set_sit_dstaddr(struct net net, struct* net_device *dev,
2943	struct in6_ifreq *ireq)
2944	{
2945	struct ip_tunnel_parm_kern p = { };
2946	int err;
2947
2948	if (!(ipv6_addr_type(addr: &ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2949	return -EADDRNOTAVAIL;
2950
2951	p.iph.daddr = ireq->ifr6_addr.s6_addr32[`3`];
2952	p.iph.version = `4`;
2953	p.iph.ihl = `5`;
2954	p.iph.protocol = IPPROTO_IPV6;
2955	p.iph.ttl = `64`;
2956
2957	if (!dev->netdev_ops->ndo_tunnel_ctl)
2958	return -EOPNOTSUPP;
2959	err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2960	if (err)
2961	return err;
2962
2963	dev = __dev_get_by_name(net, name: p.name);
2964	if (!dev)
2965	return -ENOBUFS;
2966	return dev_open(dev, NULL);
2967	}
2968
2969	/*
2970	* Set destination address.
2971	* Special case for SIT interfaces where we create a new "virtual"
2972	* device.
2973	*/
2974	int addrconf_set_dstaddr(struct net net, void* __user *arg)
2975	{
2976	struct net_device *dev;
2977	struct in6_ifreq ireq;
2978	int err = -ENODEV;
2979
2980	if (!IS_ENABLED(CONFIG_IPV6_SIT))
2981	return -ENODEV;
2982	if (copy_from_user(to: &ireq, from: arg, n: sizeof(struct in6_ifreq)))
2983	return -EFAULT;
2984
2985	rtnl_net_lock(net);
2986	dev = __dev_get_by_index(net, ifindex: ireq.ifr6_ifindex);
2987	if (dev && dev->type == ARPHRD_SIT)
2988	err = addrconf_set_sit_dstaddr(net, dev, ireq: &ireq);
2989	rtnl_net_unlock(net);
2990	return err;
2991	}
2992
2993	static int ipv6_mc_config(struct sock *sk, bool join,
2994	const struct in6_addr addr, int* ifindex)
2995	{
2996	int ret;
2997
2998	ASSERT_RTNL();
2999
3000	lock_sock(sk);
3001	if (join)
3002	ret = ipv6_sock_mc_join(sk, ifindex, addr);
3003	else
3004	ret = ipv6_sock_mc_drop(sk, ifindex, addr);
3005	release_sock(sk);
3006
3007	return ret;
3008	}
3009
3010	/*
3011	* Manual configuration of address on an interface
3012	*/
3013	static int inet6_addr_add(struct net net, struct* net_device *dev,
3014	struct ifa6_config *cfg, clock_t expires, u32 flags,
3015	struct netlink_ext_ack *extack)
3016	{
3017	struct inet6_ifaddr *ifp;
3018	struct inet6_dev *idev;
3019
3020	ASSERT_RTNL_NET(net);
3021
3022	if (cfg->plen > `128`) {
3023	NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3024	return -EINVAL;
3025	}
3026
3027	if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != `64`) {
3028	NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3029	return -EINVAL;
3030	}
3031
3032	idev = addrconf_add_dev(dev);
3033	if (IS_ERR(ptr: idev)) {
3034	NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3035	return PTR_ERR(ptr: idev);
3036	}
3037
3038	if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3039	int ret = ipv6_mc_config(sk: net->ipv6.mc_autojoin_sk,
3040	join: true, addr: cfg->pfx, ifindex: dev->ifindex);
3041
3042	if (ret < `0`) {
3043	NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3044	return ret;
3045	}
3046	}
3047
3048	cfg->scope = ipv6_addr_scope(addr: cfg->pfx);
3049
3050	ifp = ipv6_add_addr(idev, cfg, can_block: true, extack);
3051	if (!IS_ERR(ptr: ifp)) {
3052	if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3053	addrconf_prefix_route(pfx: &ifp->addr, plen: ifp->prefix_len,
3054	metric: ifp->rt_priority, dev, expires,
3055	flags, GFP_KERNEL);
3056	}
3057
3058	/ Send a netlink notification if DAD is enabled and*
3059	* optimistic flag is not set
3060	*/
3061	if (!(ifp->flags & (IFA_F_OPTIMISTIC \| IFA_F_NODAD)))
3062	ipv6_ifa_notify(event: `0`, ifa: ifp);
3063	/*
3064	* Note that section 3.1 of RFC 4429 indicates
3065	* that the Optimistic flag should not be set for
3066	* manually configured addresses
3067	*/
3068	addrconf_dad_start(ifp);
3069	if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3070	manage_tempaddrs(idev, ifp, valid_lft: cfg->valid_lft,
3071	prefered_lft: cfg->preferred_lft, create: true, now: jiffies);
3072	in6_ifa_put(ifp);
3073	addrconf_verify_rtnl(net);
3074	return `0`;
3075	} else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3076	ipv6_mc_config(sk: net->ipv6.mc_autojoin_sk, join: false,
3077	addr: cfg->pfx, ifindex: dev->ifindex);
3078	}
3079
3080	return PTR_ERR(ptr: ifp);
3081	}
3082
3083	static int inet6_addr_del(struct net net, int* ifindex, u32 ifa_flags,
3084	const struct in6_addr pfx, unsigned* int plen,
3085	struct netlink_ext_ack *extack)
3086	{
3087	struct inet6_ifaddr *ifp;
3088	struct inet6_dev *idev;
3089	struct net_device *dev;
3090
3091	if (plen > `128`) {
3092	NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3093	return -EINVAL;
3094	}
3095
3096	dev = __dev_get_by_index(net, ifindex);
3097	if (!dev) {
3098	NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3099	return -ENODEV;
3100	}
3101
3102	idev = __in6_dev_get_rtnl_net(dev);
3103	if (!idev) {
3104	NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3105	return -ENXIO;
3106	}
3107
3108	read_lock_bh(&idev->lock);
3109	list_for_each_entry(ifp, &idev->addr_list, if_list) {
3110	if (ifp->prefix_len == plen &&
3111	ipv6_addr_equal(a1: pfx, a2: &ifp->addr)) {
3112	in6_ifa_hold(ifp);
3113	read_unlock_bh(&idev->lock);
3114
3115	ipv6_del_addr(ifp);
3116
3117	if (!(ifp->flags & IFA_F_TEMPORARY) &&
3118	(ifp->flags & IFA_F_MANAGETEMPADDR))
3119	delete_tempaddrs(idev, ifp);
3120
3121	addrconf_verify_rtnl(net);
3122	if (ipv6_addr_is_multicast(addr: pfx)) {
3123	ipv6_mc_config(sk: net->ipv6.mc_autojoin_sk,
3124	join: false, addr: pfx, ifindex: dev->ifindex);
3125	}
3126	return `0`;
3127	}
3128	}
3129	read_unlock_bh(&idev->lock);
3130
3131	NL_SET_ERR_MSG_MOD(extack, "address not found");
3132	return -EADDRNOTAVAIL;
3133	}
3134
3135
3136	int addrconf_add_ifaddr(struct net net, void* __user *arg)
3137	{
3138	struct ifa6_config cfg = {
3139	.ifa_flags = IFA_F_PERMANENT,
3140	.preferred_lft = INFINITY_LIFE_TIME,
3141	.valid_lft = INFINITY_LIFE_TIME,
3142	};
3143	struct net_device *dev;
3144	struct in6_ifreq ireq;
3145	int err;
3146
3147	if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
3148	return -EPERM;
3149
3150	if (copy_from_user(to: &ireq, from: arg, n: sizeof(struct in6_ifreq)))
3151	return -EFAULT;
3152
3153	cfg.pfx = &ireq.ifr6_addr;
3154	cfg.plen = ireq.ifr6_prefixlen;
3155
3156	rtnl_net_lock(net);
3157	dev = __dev_get_by_index(net, ifindex: ireq.ifr6_ifindex);
3158	if (dev) {
3159	netdev_lock_ops(dev);
3160	err = inet6_addr_add(net, dev, cfg: &cfg, expires: `0`, flags: `0`, NULL);
3161	netdev_unlock_ops(dev);
3162	} else {
3163	err = -ENODEV;
3164	}
3165	rtnl_net_unlock(net);
3166	return err;
3167	}
3168
3169	int addrconf_del_ifaddr(struct net net, void* __user *arg)
3170	{
3171	struct in6_ifreq ireq;
3172	int err;
3173
3174	if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
3175	return -EPERM;
3176
3177	if (copy_from_user(to: &ireq, from: arg, n: sizeof(struct in6_ifreq)))
3178	return -EFAULT;
3179
3180	rtnl_net_lock(net);
3181	err = inet6_addr_del(net, ifindex: ireq.ifr6_ifindex, ifa_flags: `0`, pfx: &ireq.ifr6_addr,
3182	plen: ireq.ifr6_prefixlen, NULL);
3183	rtnl_net_unlock(net);
3184	return err;
3185	}
3186
3187	static void add_addr(struct inet6_dev idev, const* struct in6_addr *addr,
3188	int plen, int scope, u8 proto)
3189	{
3190	struct inet6_ifaddr *ifp;
3191	struct ifa6_config cfg = {
3192	.pfx = addr,
3193	.plen = plen,
3194	.ifa_flags = IFA_F_PERMANENT,
3195	.valid_lft = INFINITY_LIFE_TIME,
3196	.preferred_lft = INFINITY_LIFE_TIME,
3197	.scope = scope,
3198	.ifa_proto = proto
3199	};
3200
3201	ifp = ipv6_add_addr(idev, cfg: &cfg, can_block: true, NULL);
3202	if (!IS_ERR(ptr: ifp)) {
3203	spin_lock_bh(lock: &ifp->lock);
3204	ifp->flags &= ~IFA_F_TENTATIVE;
3205	spin_unlock_bh(lock: &ifp->lock);
3206	rt_genid_bump_ipv6(net: dev_net(dev: idev->dev));
3207	ipv6_ifa_notify(RTM_NEWADDR, ifa: ifp);
3208	in6_ifa_put(ifp);
3209	}
3210	}
3211
3212	#if IS_ENABLED(CONFIG_IPV6_SIT) \|\| IS_ENABLED(CONFIG_NET_IPGRE)
3213	static void add_v4_addrs(struct inet6_dev *idev)
3214	{
3215	struct in6_addr addr;
3216	struct net_device *dev;
3217	struct net *net = dev_net(dev: idev->dev);
3218	int scope, plen;
3219	u32 pflags = `0`;
3220
3221	ASSERT_RTNL();
3222
3223	memset(s: &addr, c: `0`, n: sizeof(struct in6_addr));
3224	memcpy(to: &addr.s6_addr32[`3`], from: idev->dev->dev_addr, len: `4`);
3225
3226	if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3227	scope = IPV6_ADDR_COMPATv4;
3228	plen = `96`;
3229	pflags \|= RTF_NONEXTHOP;
3230	} else {
3231	if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3232	return;
3233
3234	addr.s6_addr32[`0`] = htonl(`0xfe800000`);
3235	scope = IFA_LINK;
3236	plen = `64`;
3237	}
3238
3239	if (addr.s6_addr32[`3`]) {
3240	add_addr(idev, addr: &addr, plen, scope, IFAPROT_UNSPEC);
3241	addrconf_prefix_route(pfx: &addr, plen, metric: `0`, dev: idev->dev, expires: `0`, flags: pflags,
3242	GFP_KERNEL);
3243	return;
3244	}
3245
3246	for_each_netdev(net, dev) {
3247	struct in_device *in_dev = __in_dev_get_rtnl(dev);
3248	if (in_dev && (dev->flags & IFF_UP)) {
3249	struct in_ifaddr *ifa;
3250	int flag = scope;
3251
3252	in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3253	addr.s6_addr32[`3`] = ifa->ifa_local;
3254
3255	if (ifa->ifa_scope == RT_SCOPE_LINK)
3256	continue;
3257	if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3258	if (idev->dev->flags&IFF_POINTOPOINT)
3259	continue;
3260	flag \|= IFA_HOST;
3261	}
3262
3263	add_addr(idev, addr: &addr, plen, scope: flag,
3264	IFAPROT_UNSPEC);
3265	addrconf_prefix_route(pfx: &addr, plen, metric: `0`, dev: idev->dev,
3266	expires: `0`, flags: pflags, GFP_KERNEL);
3267	}
3268	}
3269	}
3270	}
3271	#endif
3272
3273	static void init_loopback(struct net_device *dev)
3274	{
3275	struct inet6_dev *idev;
3276
3277	/ ::1 /
3278
3279	ASSERT_RTNL();
3280
3281	idev = ipv6_find_idev(dev);
3282	if (IS_ERR(ptr: idev)) {
3283	pr_debug("%s: add_dev failed\n", __func__);
3284	return;
3285	}
3286
3287	add_addr(idev, addr: &in6addr_loopback, plen: `128`, IFA_HOST, IFAPROT_KERNEL_LO);
3288	}
3289
3290	void addrconf_add_linklocal(struct inet6_dev *idev,
3291	const struct in6_addr *addr, u32 flags)
3292	{
3293	struct ifa6_config cfg = {
3294	.pfx = addr,
3295	.plen = `64`,
3296	.ifa_flags = flags \| IFA_F_PERMANENT,
3297	.valid_lft = INFINITY_LIFE_TIME,
3298	.preferred_lft = INFINITY_LIFE_TIME,
3299	.scope = IFA_LINK,
3300	.ifa_proto = IFAPROT_KERNEL_LL
3301	};
3302	struct inet6_ifaddr *ifp;
3303
3304	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3305	if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) \|\|
3306	READ_ONCE(idev->cnf.optimistic_dad)) &&
3307	!dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3308	cfg.ifa_flags \|= IFA_F_OPTIMISTIC;
3309	#endif
3310
3311	ifp = ipv6_add_addr(idev, cfg: &cfg, can_block: true, NULL);
3312	if (!IS_ERR(ptr: ifp)) {
3313	addrconf_prefix_route(pfx: &ifp->addr, plen: ifp->prefix_len, metric: `0`, dev: idev->dev,
3314	expires: `0`, flags: `0`, GFP_ATOMIC);
3315	addrconf_dad_start(ifp);
3316	in6_ifa_put(ifp);
3317	}
3318	}
3319	EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3320
3321	static bool ipv6_reserved_interfaceid(struct in6_addr address)
3322	{
3323	if ((address.s6_addr32[`2`] \| address.s6_addr32[`3`]) == `0`)
3324	return true;
3325
3326	if (address.s6_addr32[`2`] == htonl(`0x02005eff`) &&
3327	((address.s6_addr32[`3`] & htonl(`0xfe000000`)) == htonl(`0xfe000000`)))
3328	return true;
3329
3330	if (address.s6_addr32[`2`] == htonl(`0xfdffffff`) &&
3331	((address.s6_addr32[`3`] & htonl(`0xffffff80`)) == htonl(`0xffffff80`)))
3332	return true;
3333
3334	return false;
3335	}
3336
3337	static int ipv6_generate_stable_address(struct in6_addr *address,
3338	u8 dad_count,
3339	const struct inet6_dev *idev)
3340	{
3341	static DEFINE_SPINLOCK(lock);
3342	static __u32 digest[SHA1_DIGEST_WORDS];
3343	static __u32 workspace[SHA1_WORKSPACE_WORDS];
3344
3345	static union {
3346	char __data[SHA1_BLOCK_SIZE];
3347	struct {
3348	struct in6_addr secret;
3349	__be32 prefix[`2`];
3350	unsigned char hwaddr[MAX_ADDR_LEN];
3351	u8 dad_count;
3352	} __packed;
3353	} data;
3354
3355	struct in6_addr secret;
3356	struct in6_addr temp;
3357	struct net *net = dev_net(dev: idev->dev);
3358
3359	BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3360
3361	if (idev->cnf.stable_secret.initialized)
3362	secret = idev->cnf.stable_secret.secret;
3363	else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3364	secret = net->ipv6.devconf_dflt->stable_secret.secret;
3365	else
3366	return -`1`;
3367
3368	retry:
3369	spin_lock_bh(lock: &lock);
3370
3371	sha1_init_raw(buf: digest);
3372	memset(s: &data, c: `0`, n: sizeof(data));
3373	memset(s: workspace, c: `0`, n: sizeof(workspace));
3374	memcpy(to: data.hwaddr, from: idev->dev->perm_addr, len: idev->dev->addr_len);
3375	data.prefix[`0`] = address->s6_addr32[`0`];
3376	data.prefix[`1`] = address->s6_addr32[`1`];
3377	data.secret = secret;
3378	data.dad_count = dad_count;
3379
3380	sha1_transform(digest, data: data.__data, W: workspace);
3381
3382	temp = *address;
3383	temp.s6_addr32[`2`] = (__force __be32)digest[`0`];
3384	temp.s6_addr32[`3`] = (__force __be32)digest[`1`];
3385
3386	spin_unlock_bh(lock: &lock);
3387
3388	if (ipv6_reserved_interfaceid(address: temp)) {
3389	dad_count++;
3390	if (dad_count > dev_net(dev: idev->dev)->ipv6.sysctl.idgen_retries)
3391	return -`1`;
3392	goto retry;
3393	}
3394
3395	*address = temp;
3396	return `0`;
3397	}
3398
3399	static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3400	{
3401	struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3402
3403	if (s->initialized)
3404	return;
3405	s = &idev->cnf.stable_secret;
3406	get_random_bytes(buf: &s->secret, len: sizeof(s->secret));
3407	s->initialized = true;
3408	}
3409
3410	static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3411	{
3412	struct in6_addr addr;
3413
3414	/ no link local addresses on L3 master devices /
3415	if (netif_is_l3_master(dev: idev->dev))
3416	return;
3417
3418	/ no link local addresses on devices flagged as slaves /
3419	if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3420	return;
3421
3422	ipv6_addr_set(addr: &addr, htonl(`0xFE800000`), w2: `0`, w3: `0`, w4: `0`);
3423
3424	switch (idev->cnf.addr_gen_mode) {
3425	case IN6_ADDR_GEN_MODE_RANDOM:
3426	ipv6_gen_mode_random_init(idev);
3427	fallthrough;
3428	case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3429	if (!ipv6_generate_stable_address(address: &addr, dad_count: `0`, idev))
3430	addrconf_add_linklocal(idev, &addr,
3431	IFA_F_STABLE_PRIVACY);
3432	else if (prefix_route)
3433	addrconf_prefix_route(pfx: &addr, plen: `64`, metric: `0`, dev: idev->dev,
3434	expires: `0`, flags: `0`, GFP_KERNEL);
3435	break;
3436	case IN6_ADDR_GEN_MODE_EUI64:
3437	/ addrconf_add_linklocal also adds a prefix_route and we*
3438	* only need to care about prefix routes if ipv6_generate_eui64
3439	* couldn't generate one.
3440	*/
3441	if (ipv6_generate_eui64(eui: addr.s6_addr + `8`, dev: idev->dev) == `0`)
3442	addrconf_add_linklocal(idev, &addr, `0`);
3443	else if (prefix_route)
3444	addrconf_prefix_route(pfx: &addr, plen: `64`, metric: `0`, dev: idev->dev,
3445	expires: `0`, flags: `0`, GFP_KERNEL);
3446	break;
3447	case IN6_ADDR_GEN_MODE_NONE:
3448	default:
3449	/ will not add any link local address /
3450	break;
3451	}
3452	}
3453
3454	static void addrconf_dev_config(struct net_device *dev)
3455	{
3456	struct inet6_dev *idev;
3457
3458	ASSERT_RTNL();
3459
3460	if ((dev->type != ARPHRD_ETHER) &&
3461	(dev->type != ARPHRD_FDDI) &&
3462	(dev->type != ARPHRD_ARCNET) &&
3463	(dev->type != ARPHRD_INFINIBAND) &&
3464	(dev->type != ARPHRD_IEEE1394) &&
3465	(dev->type != ARPHRD_TUNNEL6) &&
3466	(dev->type != ARPHRD_6LOWPAN) &&
3467	(dev->type != ARPHRD_IP6GRE) &&
3468	(dev->type != ARPHRD_TUNNEL) &&
3469	(dev->type != ARPHRD_NONE) &&
3470	(dev->type != ARPHRD_RAWIP)) {
3471	/ Alas, we support only Ethernet autoconfiguration. /
3472	idev = __in6_dev_get(dev);
3473	if (!IS_ERR_OR_NULL(ptr: idev) && dev->flags & IFF_UP &&
3474	dev->flags & IFF_MULTICAST)
3475	ipv6_mc_up(idev);
3476	return;
3477	}
3478
3479	idev = addrconf_add_dev(dev);
3480	if (IS_ERR(ptr: idev))
3481	return;
3482
3483	/ this device type has no EUI support /
3484	if (dev->type == ARPHRD_NONE &&
3485	idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3486	WRITE_ONCE(idev->cnf.addr_gen_mode,
3487	IN6_ADDR_GEN_MODE_RANDOM);
3488
3489	addrconf_addr_gen(idev, prefix_route: false);
3490	}
3491
3492	#if IS_ENABLED(CONFIG_IPV6_SIT)
3493	static void addrconf_sit_config(struct net_device *dev)
3494	{
3495	struct inet6_dev *idev;
3496
3497	ASSERT_RTNL();
3498
3499	/*
3500	* Configure the tunnel with one of our IPv4
3501	* addresses... we should configure all of
3502	* our v4 addrs in the tunnel
3503	*/
3504
3505	idev = ipv6_find_idev(dev);
3506	if (IS_ERR(ptr: idev)) {
3507	pr_debug("%s: add_dev failed\n", __func__);
3508	return;
3509	}
3510
3511	if (dev->priv_flags & IFF_ISATAP) {
3512	addrconf_addr_gen(idev, prefix_route: false);
3513	return;
3514	}
3515
3516	add_v4_addrs(idev);
3517
3518	if (dev->flags&IFF_POINTOPOINT)
3519	addrconf_add_mroute(dev);
3520	}
3521	#endif
3522
3523	#if IS_ENABLED(CONFIG_NET_IPGRE)
3524	static void addrconf_gre_config(struct net_device *dev)
3525	{
3526	struct inet6_dev *idev;
3527
3528	ASSERT_RTNL();
3529
3530	idev = addrconf_add_dev(dev);
3531	if (IS_ERR(idev))
3532	return;
3533
3534	/ Generate the IPv6 link-local address using addrconf_addr_gen(),*
3535	* unless we have an IPv4 GRE device not bound to an IP address and
3536	* which is in EUI64 mode (as __ipv6_isatap_ifid() would fail in this
3537	* case). Such devices fall back to add_v4_addrs() instead.
3538	*/
3539	if (!((__be32 )dev->dev_addr == `0` &&
3540	idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)) {
3541	addrconf_addr_gen(idev, true);
3542	return;
3543	}
3544
3545	add_v4_addrs(idev);
3546	}
3547	#endif
3548
3549	static void addrconf_init_auto_addrs(struct net_device *dev)
3550	{
3551	switch (dev->type) {
3552	#if IS_ENABLED(CONFIG_IPV6_SIT)
3553	case ARPHRD_SIT:
3554	addrconf_sit_config(dev);
3555	break;
3556	#endif
3557	#if IS_ENABLED(CONFIG_NET_IPGRE)
3558	case ARPHRD_IPGRE:
3559	addrconf_gre_config(dev);
3560	break;
3561	#endif
3562	case ARPHRD_LOOPBACK:
3563	init_loopback(dev);
3564	break;
3565
3566	default:
3567	addrconf_dev_config(dev);
3568	break;
3569	}
3570	}
3571
3572	static int fixup_permanent_addr(struct net *net,
3573	struct inet6_dev *idev,
3574	struct inet6_ifaddr *ifp)
3575	{
3576	/ !fib6_node means the host route was removed from the*
3577	* FIB, for example, if 'lo' device is taken down. In that
3578	* case regenerate the host route.
3579	*/
3580	if (!ifp->rt \|\| !ifp->rt->fib6_node) {
3581	struct fib6_info f6i, prev;
3582
3583	f6i = addrconf_f6i_alloc(net, idev, addr: &ifp->addr, anycast: false,
3584	GFP_ATOMIC, NULL);
3585	if (IS_ERR(ptr: f6i))
3586	return PTR_ERR(ptr: f6i);
3587
3588	/ ifp->rt can be accessed outside of rtnl /
3589	spin_lock(lock: &ifp->lock);
3590	prev = ifp->rt;
3591	ifp->rt = f6i;
3592	spin_unlock(lock: &ifp->lock);
3593
3594	fib6_info_release(f6i: prev);
3595	}
3596
3597	if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3598	addrconf_prefix_route(pfx: &ifp->addr, plen: ifp->prefix_len,
3599	metric: ifp->rt_priority, dev: idev->dev, expires: `0`, flags: `0`,
3600	GFP_ATOMIC);
3601	}
3602
3603	if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3604	addrconf_dad_start(ifp);
3605
3606	return `0`;
3607	}
3608
3609	static void addrconf_permanent_addr(struct net net, struct* net_device *dev)
3610	{
3611	struct inet6_ifaddr ifp, tmp;
3612	struct inet6_dev *idev;
3613
3614	idev = __in6_dev_get(dev);
3615	if (!idev)
3616	return;
3617
3618	write_lock_bh(&idev->lock);
3619
3620	list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3621	if ((ifp->flags & IFA_F_PERMANENT) &&
3622	fixup_permanent_addr(net, idev, ifp) < `0`) {
3623	write_unlock_bh(&idev->lock);
3624	in6_ifa_hold(ifp);
3625	ipv6_del_addr(ifp);
3626	write_lock_bh(&idev->lock);
3627
3628	net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3629	idev->dev->name, &ifp->addr);
3630	}
3631	}
3632
3633	write_unlock_bh(&idev->lock);
3634	}
3635
3636	static int addrconf_notify(struct notifier_block this, unsigned* long event,
3637	void *ptr)
3638	{
3639	struct net_device *dev = netdev_notifier_info_to_dev(info: ptr);
3640	struct netdev_notifier_change_info *change_info;
3641	struct netdev_notifier_changeupper_info *info;
3642	struct inet6_dev *idev = __in6_dev_get(dev);
3643	struct net *net = dev_net(dev);
3644	int run_pending = `0`;
3645	int err;
3646
3647	switch (event) {
3648	case NETDEV_REGISTER:
3649	if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3650	idev = ipv6_add_dev(dev);
3651	if (IS_ERR(ptr: idev))
3652	return notifier_from_errno(err: PTR_ERR(ptr: idev));
3653	}
3654	break;
3655
3656	case NETDEV_CHANGEMTU:
3657	/ if MTU under IPV6_MIN_MTU stop IPv6 on this interface. /
3658	if (dev->mtu < IPV6_MIN_MTU) {
3659	addrconf_ifdown(dev, unregister: dev != net->loopback_dev);
3660	break;
3661	}
3662
3663	if (idev) {
3664	rt6_mtu_change(dev, mtu: dev->mtu);
3665	WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3666	break;
3667	}
3668
3669	/ allocate new idev /
3670	idev = ipv6_add_dev(dev);
3671	if (IS_ERR(ptr: idev))
3672	break;
3673
3674	/ device is still not ready /
3675	if (!(idev->if_flags & IF_READY))
3676	break;
3677
3678	run_pending = `1`;
3679	fallthrough;
3680	case NETDEV_UP:
3681	case NETDEV_CHANGE:
3682	if (idev && idev->cnf.disable_ipv6)
3683	break;
3684
3685	if (dev->priv_flags & IFF_NO_ADDRCONF) {
3686	if (event == NETDEV_UP && !IS_ERR_OR_NULL(ptr: idev) &&
3687	dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3688	ipv6_mc_up(idev);
3689	break;
3690	}
3691
3692	if (event == NETDEV_UP) {
3693	/ restore routes for permanent addresses /
3694	addrconf_permanent_addr(net, dev);
3695
3696	if (!addrconf_link_ready(dev)) {
3697	/ device is not ready yet. /
3698	pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3699	dev->name);
3700	break;
3701	}
3702
3703	if (!idev && dev->mtu >= IPV6_MIN_MTU)
3704	idev = ipv6_add_dev(dev);
3705
3706	if (!IS_ERR_OR_NULL(ptr: idev)) {
3707	idev->if_flags \|= IF_READY;
3708	run_pending = `1`;
3709	}
3710	} else if (event == NETDEV_CHANGE) {
3711	if (!addrconf_link_ready(dev)) {
3712	/ device is still not ready. /
3713	rt6_sync_down_dev(dev, event);
3714	break;
3715	}
3716
3717	if (!IS_ERR_OR_NULL(ptr: idev)) {
3718	if (idev->if_flags & IF_READY) {
3719	/ device is already configured -*
3720	* but resend MLD reports, we might
3721	* have roamed and need to update
3722	* multicast snooping switches
3723	*/
3724	ipv6_mc_up(idev);
3725	change_info = ptr;
3726	if (change_info->flags_changed & IFF_NOARP)
3727	addrconf_dad_run(idev, restart: true);
3728	rt6_sync_up(dev, RTNH_F_LINKDOWN);
3729	break;
3730	}
3731	idev->if_flags \|= IF_READY;
3732	}
3733
3734	pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3735	dev->name);
3736
3737	run_pending = `1`;
3738	}
3739
3740	addrconf_init_auto_addrs(dev);
3741
3742	if (!IS_ERR_OR_NULL(ptr: idev)) {
3743	if (run_pending)
3744	addrconf_dad_run(idev, restart: false);
3745
3746	/ Device has an address by now /
3747	rt6_sync_up(dev, RTNH_F_DEAD);
3748
3749	/*
3750	* If the MTU changed during the interface down,
3751	* when the interface up, the changed MTU must be
3752	* reflected in the idev as well as routers.
3753	*/
3754	if (idev->cnf.mtu6 != dev->mtu &&
3755	dev->mtu >= IPV6_MIN_MTU) {
3756	rt6_mtu_change(dev, mtu: dev->mtu);
3757	WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3758	}
3759	WRITE_ONCE(idev->tstamp, jiffies);
3760	inet6_ifinfo_notify(RTM_NEWLINK, idev);
3761
3762	/*
3763	* If the changed mtu during down is lower than
3764	* IPV6_MIN_MTU stop IPv6 on this interface.
3765	*/
3766	if (dev->mtu < IPV6_MIN_MTU)
3767	addrconf_ifdown(dev, unregister: dev != net->loopback_dev);
3768	}
3769	break;
3770
3771	case NETDEV_DOWN:
3772	case NETDEV_UNREGISTER:
3773	/*
3774	* Remove all addresses from this interface.
3775	*/
3776	addrconf_ifdown(dev, unregister: event != NETDEV_DOWN);
3777	break;
3778
3779	case NETDEV_CHANGENAME:
3780	if (idev) {
3781	snmp6_unregister_dev(idev);
3782	addrconf_sysctl_unregister(idev);
3783	err = addrconf_sysctl_register(idev);
3784	if (err)
3785	return notifier_from_errno(err);
3786	err = snmp6_register_dev(idev);
3787	if (err) {
3788	addrconf_sysctl_unregister(idev);
3789	return notifier_from_errno(err);
3790	}
3791	}
3792	break;
3793
3794	case NETDEV_PRE_TYPE_CHANGE:
3795	case NETDEV_POST_TYPE_CHANGE:
3796	if (idev)
3797	addrconf_type_change(dev, event);
3798	break;
3799
3800	case NETDEV_CHANGEUPPER:
3801	info = ptr;
3802
3803	/ flush all routes if dev is linked to or unlinked from*
3804	* an L3 master device (e.g., VRF)
3805	*/
3806	if (info->upper_dev && netif_is_l3_master(dev: info->upper_dev))
3807	addrconf_ifdown(dev, unregister: false);
3808	}
3809
3810	return NOTIFY_OK;
3811	}
3812
3813	/*
3814	* addrconf module should be notified of a device going up
3815	*/
3816	static struct notifier_block ipv6_dev_notf = {
3817	.notifier_call = addrconf_notify,
3818	.priority = ADDRCONF_NOTIFY_PRIORITY,
3819	};
3820
3821	static void addrconf_type_change(struct net_device dev, unsigned* long event)
3822	{
3823	struct inet6_dev *idev;
3824	ASSERT_RTNL();
3825
3826	idev = __in6_dev_get(dev);
3827
3828	if (event == NETDEV_POST_TYPE_CHANGE)
3829	ipv6_mc_remap(idev);
3830	else if (event == NETDEV_PRE_TYPE_CHANGE)
3831	ipv6_mc_unmap(idev);
3832	}
3833
3834	static bool addr_is_local(const struct in6_addr *addr)
3835	{
3836	return ipv6_addr_type(addr) &
3837	(IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_LOOPBACK);
3838	}
3839
3840	static int addrconf_ifdown(struct net_device *dev, bool unregister)
3841	{
3842	unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3843	struct net *net = dev_net(dev);
3844	struct inet6_dev *idev;
3845	struct inet6_ifaddr *ifa;
3846	LIST_HEAD(tmp_addr_list);
3847	bool keep_addr = false;
3848	bool was_ready;
3849	int state, i;
3850
3851	ASSERT_RTNL();
3852
3853	rt6_disable_ip(dev, event);
3854
3855	idev = __in6_dev_get(dev);
3856	if (!idev)
3857	return -ENODEV;
3858
3859	/*
3860	* Step 1: remove reference to ipv6 device from parent device.
3861	* Do not dev_put!
3862	*/
3863	if (unregister) {
3864	WRITE_ONCE(idev->dead, `1`);
3865
3866	/ protected by rtnl_lock /
3867	RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3868
3869	/ Step 1.5: remove snmp6 entry /
3870	snmp6_unregister_dev(idev);
3871
3872	}
3873
3874	/ combine the user config with event to determine if permanent*
3875	* addresses are to be removed from address hash table
3876	*/
3877	if (!unregister && !idev->cnf.disable_ipv6) {
3878	/ aggregate the system setting and interface setting /
3879	int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3880
3881	if (!_keep_addr)
3882	_keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3883
3884	keep_addr = (_keep_addr > `0`);
3885	}
3886
3887	/ Step 2: clear hash table /
3888	for (i = `0`; i < IN6_ADDR_HSIZE; i++) {
3889	struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3890
3891	spin_lock_bh(lock: &net->ipv6.addrconf_hash_lock);
3892	restart:
3893	hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3894	if (ifa->idev == idev) {
3895	addrconf_del_dad_work(ifp: ifa);
3896	/ combined flag + permanent flag decide if*
3897	* address is retained on a down event
3898	*/
3899	if (!keep_addr \|\|
3900	!(ifa->flags & IFA_F_PERMANENT) \|\|
3901	addr_is_local(addr: &ifa->addr)) {
3902	hlist_del_init_rcu(n: &ifa->addr_lst);
3903	goto restart;
3904	}
3905	}
3906	}
3907	spin_unlock_bh(lock: &net->ipv6.addrconf_hash_lock);
3908	}
3909
3910	write_lock_bh(&idev->lock);
3911
3912	addrconf_del_rs_timer(idev);
3913
3914	/ Step 2: clear flags for stateless addrconf, repeated down*
3915	* detection
3916	*/
3917	was_ready = idev->if_flags & IF_READY;
3918	if (!unregister)
3919	idev->if_flags &= ~(IF_RS_SENT\|IF_RA_RCVD\|IF_READY);
3920
3921	/ Step 3: clear tempaddr list /
3922	while (!list_empty(head: &idev->tempaddr_list)) {
3923	ifa = list_first_entry(&idev->tempaddr_list,
3924	struct inet6_ifaddr, tmp_list);
3925	list_del(entry: &ifa->tmp_list);
3926	write_unlock_bh(&idev->lock);
3927	spin_lock_bh(lock: &ifa->lock);
3928
3929	if (ifa->ifpub) {
3930	in6_ifa_put(ifp: ifa->ifpub);
3931	ifa->ifpub = NULL;
3932	}
3933	spin_unlock_bh(lock: &ifa->lock);
3934	in6_ifa_put(ifp: ifa);
3935	write_lock_bh(&idev->lock);
3936	}
3937
3938	list_for_each_entry(ifa, &idev->addr_list, if_list)
3939	list_add_tail(new: &ifa->if_list_aux, head: &tmp_addr_list);
3940	write_unlock_bh(&idev->lock);
3941
3942	while (!list_empty(head: &tmp_addr_list)) {
3943	struct fib6_info *rt = NULL;
3944	bool keep;
3945
3946	ifa = list_first_entry(&tmp_addr_list,
3947	struct inet6_ifaddr, if_list_aux);
3948	list_del(entry: &ifa->if_list_aux);
3949
3950	addrconf_del_dad_work(ifp: ifa);
3951
3952	keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3953	!addr_is_local(addr: &ifa->addr);
3954
3955	spin_lock_bh(lock: &ifa->lock);
3956
3957	if (keep) {
3958	/ set state to skip the notifier below /
3959	state = INET6_IFADDR_STATE_DEAD;
3960	ifa->state = INET6_IFADDR_STATE_PREDAD;
3961	if (!(ifa->flags & IFA_F_NODAD))
3962	ifa->flags \|= IFA_F_TENTATIVE;
3963
3964	rt = ifa->rt;
3965	ifa->rt = NULL;
3966	} else {
3967	state = ifa->state;
3968	ifa->state = INET6_IFADDR_STATE_DEAD;
3969	}
3970
3971	spin_unlock_bh(lock: &ifa->lock);
3972
3973	if (rt)
3974	ip6_del_rt(net, f6i: rt, skip_notify: false);
3975
3976	if (state != INET6_IFADDR_STATE_DEAD) {
3977	__ipv6_ifa_notify(RTM_DELADDR, ifa);
3978	inet6addr_notifier_call_chain(val: NETDEV_DOWN, v: ifa);
3979	} else {
3980	if (idev->cnf.forwarding)
3981	addrconf_leave_anycast(ifp: ifa);
3982	addrconf_leave_solict(idev: ifa->idev, addr: &ifa->addr);
3983	}
3984
3985	if (!keep) {
3986	write_lock_bh(&idev->lock);
3987	list_del_rcu(entry: &ifa->if_list);
3988	write_unlock_bh(&idev->lock);
3989	in6_ifa_put(ifp: ifa);
3990	}
3991	}
3992
3993	/ Step 5: Discard anycast and multicast list /
3994	if (unregister) {
3995	ipv6_ac_destroy_dev(idev);
3996	ipv6_mc_destroy_dev(idev);
3997	} else if (was_ready) {
3998	ipv6_mc_down(idev);
3999	}
4000
4001	WRITE_ONCE(idev->tstamp, jiffies);
4002	idev->ra_mtu = `0`;
4003
4004	/ Last: Shot the device (if unregistered) /
4005	if (unregister) {
4006	addrconf_sysctl_unregister(idev);
4007	neigh_parms_release(tbl: &nd_tbl, parms: idev->nd_parms);
4008	neigh_ifdown(tbl: &nd_tbl, dev);
4009	in6_dev_put(idev);
4010	}
4011	return `0`;
4012	}
4013
4014	static void addrconf_rs_timer(struct timer_list *t)
4015	{
4016	struct inet6_dev *idev = timer_container_of(idev, t, rs_timer);
4017	struct net_device *dev = idev->dev;
4018	struct in6_addr lladdr;
4019	int rtr_solicits;
4020
4021	write_lock(&idev->lock);
4022	if (idev->dead \|\| !(idev->if_flags & IF_READY))
4023	goto out;
4024
4025	if (!ipv6_accept_ra(idev))
4026	goto out;
4027
4028	/ Announcement received after solicitation was sent /
4029	if (idev->if_flags & IF_RA_RCVD)
4030	goto out;
4031
4032	rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4033
4034	if (idev->rs_probes++ < rtr_solicits \|\| rtr_solicits < `0`) {
4035	write_unlock(&idev->lock);
4036	if (!ipv6_get_lladdr(dev, addr: &lladdr, IFA_F_TENTATIVE))
4037	ndisc_send_rs(dev, saddr: &lladdr,
4038	daddr: &in6addr_linklocal_allrouters);
4039	else
4040	goto put;
4041
4042	write_lock(&idev->lock);
4043	idev->rs_interval = rfc3315_s14_backoff_update(
4044	rt: idev->rs_interval,
4045	READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4046	/ The wait after the last probe can be shorter /
4047	addrconf_mod_rs_timer(idev, when: (idev->rs_probes ==
4048	READ_ONCE(idev->cnf.rtr_solicits)) ?
4049	READ_ONCE(idev->cnf.rtr_solicit_delay) :
4050	idev->rs_interval);
4051	} else {
4052	/*
4053	* Note: we do not support deprecated "all on-link"
4054	* assumption any longer.
4055	*/
4056	pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4057	}
4058
4059	out:
4060	write_unlock(&idev->lock);
4061	put:
4062	in6_dev_put(idev);
4063	}
4064
4065	/*
4066	* Duplicate Address Detection
4067	*/
4068	static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4069	{
4070	struct inet6_dev *idev = ifp->idev;
4071	unsigned long rand_num;
4072	u64 nonce;
4073
4074	if (ifp->flags & IFA_F_OPTIMISTIC)
4075	rand_num = `0`;
4076	else
4077	rand_num = get_random_u32_below(
4078	READ_ONCE(idev->cnf.rtr_solicit_delay) ? : `1`);
4079
4080	nonce = `0`;
4081	if (READ_ONCE(idev->cnf.enhanced_dad) \|\|
4082	READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4083	do
4084	get_random_bytes(buf: &nonce, len: `6`);
4085	while (nonce == `0`);
4086	}
4087	ifp->dad_nonce = nonce;
4088	ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4089	addrconf_mod_dad_work(ifp, delay: rand_num);
4090	}
4091
4092	static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4093	{
4094	struct inet6_dev *idev = ifp->idev;
4095	struct net_device *dev = idev->dev;
4096	bool bump_id, notify = false;
4097	struct net *net;
4098
4099	addrconf_join_solict(dev, addr: &ifp->addr);
4100
4101	read_lock_bh(&idev->lock);
4102	spin_lock(lock: &ifp->lock);
4103	if (ifp->state == INET6_IFADDR_STATE_DEAD)
4104	goto out;
4105
4106	net = dev_net(dev);
4107	if (dev->flags&(IFF_NOARP\|IFF_LOOPBACK) \|\|
4108	(READ_ONCE(net->ipv6.devconf_all->accept_dad) < `1` &&
4109	READ_ONCE(idev->cnf.accept_dad) < `1`) \|\|
4110	!(ifp->flags&IFA_F_TENTATIVE) \|\|
4111	ifp->flags & IFA_F_NODAD) {
4112	bool send_na = false;
4113
4114	if (ifp->flags & IFA_F_TENTATIVE &&
4115	!(ifp->flags & IFA_F_OPTIMISTIC))
4116	send_na = true;
4117	bump_id = ifp->flags & IFA_F_TENTATIVE;
4118	ifp->flags &= ~(IFA_F_TENTATIVE\|IFA_F_OPTIMISTIC\|IFA_F_DADFAILED);
4119	spin_unlock(lock: &ifp->lock);
4120	read_unlock_bh(&idev->lock);
4121
4122	addrconf_dad_completed(ifp, bump_id, send_na);
4123	return;
4124	}
4125
4126	if (!(idev->if_flags & IF_READY)) {
4127	spin_unlock(lock: &ifp->lock);
4128	read_unlock_bh(&idev->lock);
4129	/*
4130	* If the device is not ready:
4131	* - keep it tentative if it is a permanent address.
4132	* - otherwise, kill it.
4133	*/
4134	in6_ifa_hold(ifp);
4135	addrconf_dad_stop(ifp, dad_failed: `0`);
4136	return;
4137	}
4138
4139	/*
4140	* Optimistic nodes can start receiving
4141	* Frames right away
4142	*/
4143	if (ifp->flags & IFA_F_OPTIMISTIC) {
4144	ip6_ins_rt(net, f6i: ifp->rt);
4145	if (ipv6_use_optimistic_addr(net, idev)) {
4146	/ Because optimistic nodes can use this address,*
4147	* notify listeners. If DAD fails, RTM_DELADDR is sent.
4148	*/
4149	notify = true;
4150	}
4151	}
4152
4153	addrconf_dad_kick(ifp);
4154	out:
4155	spin_unlock(lock: &ifp->lock);
4156	read_unlock_bh(&idev->lock);
4157	if (notify)
4158	ipv6_ifa_notify(RTM_NEWADDR, ifa: ifp);
4159	}
4160
4161	static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4162	{
4163	bool begin_dad = false;
4164
4165	spin_lock_bh(lock: &ifp->lock);
4166	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4167	ifp->state = INET6_IFADDR_STATE_PREDAD;
4168	begin_dad = true;
4169	}
4170	spin_unlock_bh(lock: &ifp->lock);
4171
4172	if (begin_dad)
4173	addrconf_mod_dad_work(ifp, delay: `0`);
4174	}
4175
4176	static void addrconf_dad_work(struct work_struct *w)
4177	{
4178	struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4179	struct inet6_ifaddr,
4180	dad_work);
4181	struct inet6_dev *idev = ifp->idev;
4182	bool bump_id, disable_ipv6 = false;
4183	struct in6_addr mcaddr;
4184	struct net *net;
4185
4186	enum {
4187	DAD_PROCESS,
4188	DAD_BEGIN,
4189	DAD_ABORT,
4190	} action = DAD_PROCESS;
4191
4192	net = dev_net(dev: idev->dev);
4193
4194	rtnl_net_lock(net);
4195
4196	spin_lock_bh(lock: &ifp->lock);
4197	if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4198	action = DAD_BEGIN;
4199	ifp->state = INET6_IFADDR_STATE_DAD;
4200	} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4201	action = DAD_ABORT;
4202	ifp->state = INET6_IFADDR_STATE_POSTDAD;
4203
4204	if ((READ_ONCE(net->ipv6.devconf_all->accept_dad) > `1` \|\|
4205	READ_ONCE(idev->cnf.accept_dad) > `1`) &&
4206	!idev->cnf.disable_ipv6 &&
4207	!(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4208	struct in6_addr addr;
4209
4210	addr.s6_addr32[`0`] = htonl(`0xfe800000`);
4211	addr.s6_addr32[`1`] = `0`;
4212
4213	if (!ipv6_generate_eui64(eui: addr.s6_addr + `8`, dev: idev->dev) &&
4214	ipv6_addr_equal(a1: &ifp->addr, a2: &addr)) {
4215	/ DAD failed for link-local based on MAC /
4216	WRITE_ONCE(idev->cnf.disable_ipv6, `1`);
4217
4218	pr_info("%s: IPv6 being disabled!\n",
4219	ifp->idev->dev->name);
4220	disable_ipv6 = true;
4221	}
4222	}
4223	}
4224	spin_unlock_bh(lock: &ifp->lock);
4225
4226	if (action == DAD_BEGIN) {
4227	addrconf_dad_begin(ifp);
4228	goto out;
4229	} else if (action == DAD_ABORT) {
4230	in6_ifa_hold(ifp);
4231	addrconf_dad_stop(ifp, dad_failed: `1`);
4232	if (disable_ipv6)
4233	addrconf_ifdown(dev: idev->dev, unregister: false);
4234	goto out;
4235	}
4236
4237	if (!ifp->dad_probes && addrconf_dad_end(ifp))
4238	goto out;
4239
4240	write_lock_bh(&idev->lock);
4241	if (idev->dead \|\| !(idev->if_flags & IF_READY)) {
4242	write_unlock_bh(&idev->lock);
4243	goto out;
4244	}
4245
4246	spin_lock(lock: &ifp->lock);
4247	if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4248	spin_unlock(lock: &ifp->lock);
4249	write_unlock_bh(&idev->lock);
4250	goto out;
4251	}
4252
4253	if (ifp->dad_probes == `0`) {
4254	bool send_na = false;
4255
4256	/*
4257	* DAD was successful
4258	*/
4259
4260	if (ifp->flags & IFA_F_TENTATIVE &&
4261	!(ifp->flags & IFA_F_OPTIMISTIC))
4262	send_na = true;
4263	bump_id = ifp->flags & IFA_F_TENTATIVE;
4264	ifp->flags &= ~(IFA_F_TENTATIVE\|IFA_F_OPTIMISTIC\|IFA_F_DADFAILED);
4265	spin_unlock(lock: &ifp->lock);
4266	write_unlock_bh(&idev->lock);
4267
4268	addrconf_dad_completed(ifp, bump_id, send_na);
4269
4270	goto out;
4271	}
4272
4273	ifp->dad_probes--;
4274	addrconf_mod_dad_work(ifp,
4275	max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4276	HZ/`100`));
4277	spin_unlock(lock: &ifp->lock);
4278	write_unlock_bh(&idev->lock);
4279
4280	/ send a neighbour solicitation for our addr /
4281	addrconf_addr_solict_mult(addr: &ifp->addr, solicited: &mcaddr);
4282	ndisc_send_ns(dev: ifp->idev->dev, solicit: &ifp->addr, daddr: &mcaddr, saddr: &in6addr_any,
4283	nonce: ifp->dad_nonce);
4284	out:
4285	in6_ifa_put(ifp);
4286	rtnl_net_unlock(net);
4287	}
4288
4289	/ ifp->idev must be at least read locked /
4290	static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4291	{
4292	struct inet6_ifaddr *ifpiter;
4293	struct inet6_dev *idev = ifp->idev;
4294
4295	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4296	if (ifpiter->scope > IFA_LINK)
4297	break;
4298	if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4299	(ifpiter->flags & (IFA_F_PERMANENT\|IFA_F_TENTATIVE\|
4300	IFA_F_OPTIMISTIC\|IFA_F_DADFAILED)) ==
4301	IFA_F_PERMANENT)
4302	return false;
4303	}
4304	return true;
4305	}
4306
4307	static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4308	bool send_na)
4309	{
4310	struct net_device *dev = ifp->idev->dev;
4311	struct in6_addr lladdr;
4312	bool send_rs, send_mld;
4313
4314	addrconf_del_dad_work(ifp);
4315
4316	/*
4317	* Configure the address for reception. Now it is valid.
4318	*/
4319
4320	ipv6_ifa_notify(RTM_NEWADDR, ifa: ifp);
4321
4322	/ If added prefix is link local and we are prepared to process*
4323	router advertisements, start sending router solicitations.
4324	*/
4325
4326	read_lock_bh(&ifp->idev->lock);
4327	send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4328	send_rs = send_mld &&
4329	ipv6_accept_ra(idev: ifp->idev) &&
4330	READ_ONCE(ifp->idev->cnf.rtr_solicits) != `0` &&
4331	(dev->flags & IFF_LOOPBACK) == `0` &&
4332	(dev->type != ARPHRD_TUNNEL) &&
4333	!netif_is_team_port(dev);
4334	read_unlock_bh(&ifp->idev->lock);
4335
4336	/ While dad is in progress mld report's source address is in6_addrany.*
4337	* Resend with proper ll now.
4338	*/
4339	if (send_mld)
4340	ipv6_mc_dad_complete(idev: ifp->idev);
4341
4342	/ send unsolicited NA if enabled /
4343	if (send_na &&
4344	(READ_ONCE(ifp->idev->cnf.ndisc_notify) \|\|
4345	READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4346	ndisc_send_na(dev, daddr: &in6addr_linklocal_allnodes, solicited_addr: &ifp->addr,
4347	/router=/ !!ifp->idev->cnf.forwarding,
4348	/solicited=/ false, /override=/ true,
4349	/inc_opt=/ true);
4350	}
4351
4352	if (send_rs) {
4353	/*
4354	* If a host as already performed a random delay
4355	* [...] as part of DAD [...] there is no need
4356	* to delay again before sending the first RS
4357	*/
4358	if (ipv6_get_lladdr(dev, addr: &lladdr, IFA_F_TENTATIVE))
4359	return;
4360	ndisc_send_rs(dev, saddr: &lladdr, daddr: &in6addr_linklocal_allrouters);
4361
4362	write_lock_bh(&ifp->idev->lock);
4363	spin_lock(lock: &ifp->lock);
4364	ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4365	READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4366	ifp->idev->rs_probes = `1`;
4367	ifp->idev->if_flags \|= IF_RS_SENT;
4368	addrconf_mod_rs_timer(idev: ifp->idev, when: ifp->idev->rs_interval);
4369	spin_unlock(lock: &ifp->lock);
4370	write_unlock_bh(&ifp->idev->lock);
4371	}
4372
4373	if (bump_id)
4374	rt_genid_bump_ipv6(net: dev_net(dev));
4375
4376	/ Make sure that a new temporary address will be created*
4377	* before this temporary address becomes deprecated.
4378	*/
4379	if (ifp->flags & IFA_F_TEMPORARY)
4380	addrconf_verify_rtnl(net: dev_net(dev));
4381	}
4382
4383	static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4384	{
4385	struct inet6_ifaddr *ifp;
4386
4387	read_lock_bh(&idev->lock);
4388	list_for_each_entry(ifp, &idev->addr_list, if_list) {
4389	spin_lock(lock: &ifp->lock);
4390	if ((ifp->flags & IFA_F_TENTATIVE &&
4391	ifp->state == INET6_IFADDR_STATE_DAD) \|\| restart) {
4392	if (restart)
4393	ifp->state = INET6_IFADDR_STATE_PREDAD;
4394	addrconf_dad_kick(ifp);
4395	}
4396	spin_unlock(lock: &ifp->lock);
4397	}
4398	read_unlock_bh(&idev->lock);
4399	}
4400
4401	#ifdef CONFIG_PROC_FS
4402	struct if6_iter_state {
4403	struct seq_net_private p;
4404	int bucket;
4405	int offset;
4406	};
4407
4408	static struct inet6_ifaddr if6_get_first(struct* seq_file *seq, loff_t pos)
4409	{
4410	struct if6_iter_state *state = seq->private;
4411	struct net *net = seq_file_net(seq);
4412	struct inet6_ifaddr *ifa = NULL;
4413	int p = `0`;
4414
4415	/ initial bucket if pos is 0 /
4416	if (pos == `0`) {
4417	state->bucket = `0`;
4418	state->offset = `0`;
4419	}
4420
4421	for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4422	hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4423	addr_lst) {
4424	/ sync with offset /
4425	if (p < state->offset) {
4426	p++;
4427	continue;
4428	}
4429	return ifa;
4430	}
4431
4432	/ prepare for next bucket /
4433	state->offset = `0`;
4434	p = `0`;
4435	}
4436	return NULL;
4437	}
4438
4439	static struct inet6_ifaddr if6_get_next(struct* seq_file *seq,
4440	struct inet6_ifaddr *ifa)
4441	{
4442	struct if6_iter_state *state = seq->private;
4443	struct net *net = seq_file_net(seq);
4444
4445	hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4446	state->offset++;
4447	return ifa;
4448	}
4449
4450	state->offset = `0`;
4451	while (++state->bucket < IN6_ADDR_HSIZE) {
4452	hlist_for_each_entry_rcu(ifa,
4453	&net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4454	return ifa;
4455	}
4456	}
4457
4458	return NULL;
4459	}
4460
4461	static void if6_seq_start(struct* seq_file seq, loff_t pos)
4462	__acquires(rcu)
4463	{
4464	rcu_read_lock();
4465	return if6_get_first(seq, pos: *pos);
4466	}
4467
4468	static void if6_seq_next(struct* seq_file seq, void* v, loff_t pos)
4469	{
4470	struct inet6_ifaddr *ifa;
4471
4472	ifa = if6_get_next(seq, ifa: v);
4473	++*pos;
4474	return ifa;
4475	}
4476
4477	static void if6_seq_stop(struct seq_file seq, void* *v)
4478	__releases(rcu)
4479	{
4480	rcu_read_unlock();
4481	}
4482
4483	static int if6_seq_show(struct seq_file seq, void* *v)
4484	{
4485	struct inet6_ifaddr ifp = (struct* inet6_ifaddr *)v;
4486	seq_printf(m: seq, fmt: "%pi6 %02x %02x %02x %02x %8s\n",
4487	&ifp->addr,
4488	ifp->idev->dev->ifindex,
4489	ifp->prefix_len,
4490	ifp->scope,
4491	(u8) ifp->flags,
4492	ifp->idev->dev->name);
4493	return `0`;
4494	}
4495
4496	static const struct seq_operations if6_seq_ops = {
4497	.start = if6_seq_start,
4498	.next = if6_seq_next,
4499	.show = if6_seq_show,
4500	.stop = if6_seq_stop,
4501	};
4502
4503	static int __net_init if6_proc_net_init(struct net *net)
4504	{
4505	if (!proc_create_net("if_inet6", `0444`, net->proc_net, &if6_seq_ops,
4506	sizeof(struct if6_iter_state)))
4507	return -ENOMEM;
4508	return `0`;
4509	}
4510
4511	static void __net_exit if6_proc_net_exit(struct net *net)
4512	{
4513	remove_proc_entry("if_inet6", net->proc_net);
4514	}
4515
4516	static struct pernet_operations if6_proc_net_ops = {
4517	.init = if6_proc_net_init,
4518	.exit = if6_proc_net_exit,
4519	};
4520
4521	int __init if6_proc_init(void)
4522	{
4523	return register_pernet_subsys(&if6_proc_net_ops);
4524	}
4525
4526	void if6_proc_exit(void)
4527	{
4528	unregister_pernet_subsys(&if6_proc_net_ops);
4529	}
4530	#endif /* CONFIG_PROC_FS */
4531
4532	#if IS_ENABLED(CONFIG_IPV6_MIP6)
4533	/ Check if address is a home address configured on any interface. /
4534	int ipv6_chk_home_addr(struct net net, const* struct in6_addr *addr)
4535	{
4536	unsigned int hash = inet6_addr_hash(net, addr);
4537	struct inet6_ifaddr *ifp = NULL;
4538	int ret = `0`;
4539
4540	rcu_read_lock();
4541	hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4542	if (ipv6_addr_equal(&ifp->addr, addr) &&
4543	(ifp->flags & IFA_F_HOMEADDRESS)) {
4544	ret = `1`;
4545	break;
4546	}
4547	}
4548	rcu_read_unlock();
4549	return ret;
4550	}
4551	#endif
4552
4553	/ RFC6554 has some algorithm to avoid loops in segment routing by*
4554	* checking if the segments contains any of a local interface address.
4555	*
4556	* Quote:
4557	*
4558	* To detect loops in the SRH, a router MUST determine if the SRH
4559	* includes multiple addresses assigned to any interface on that router.
4560	* If such addresses appear more than once and are separated by at least
4561	* one address not assigned to that router.
4562	*/
4563	int ipv6_chk_rpl_srh_loop(struct net net, const* struct in6_addr *segs,
4564	unsigned char nsegs)
4565	{
4566	const struct in6_addr *addr;
4567	int i, ret = `0`, found = `0`;
4568	struct inet6_ifaddr *ifp;
4569	bool separated = false;
4570	unsigned int hash;
4571	bool hash_found;
4572
4573	rcu_read_lock();
4574	for (i = `0`; i < nsegs; i++) {
4575	addr = &segs[i];
4576	hash = inet6_addr_hash(net, addr);
4577
4578	hash_found = false;
4579	hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4580
4581	if (ipv6_addr_equal(a1: &ifp->addr, a2: addr)) {
4582	hash_found = true;
4583	break;
4584	}
4585	}
4586
4587	if (hash_found) {
4588	if (found > `1` && separated) {
4589	ret = `1`;
4590	break;
4591	}
4592
4593	separated = false;
4594	found++;
4595	} else {
4596	separated = true;
4597	}
4598	}
4599	rcu_read_unlock();
4600
4601	return ret;
4602	}
4603
4604	/*
4605	* Periodic address status verification
4606	*/
4607
4608	static void addrconf_verify_rtnl(struct net *net)
4609	{
4610	unsigned long now, next, next_sec, next_sched;
4611	struct inet6_ifaddr *ifp;
4612	int i;
4613
4614	ASSERT_RTNL();
4615
4616	rcu_read_lock_bh();
4617	now = jiffies;
4618	next = round_jiffies_up(j: now + ADDR_CHECK_FREQUENCY);
4619
4620	cancel_delayed_work(dwork: &net->ipv6.addr_chk_work);
4621
4622	for (i = `0`; i < IN6_ADDR_HSIZE; i++) {
4623	restart:
4624	hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4625	unsigned long age;
4626
4627	/ When setting preferred_lft to a value not zero or*
4628	* infinity, while valid_lft is infinity
4629	* IFA_F_PERMANENT has a non-infinity life time.
4630	*/
4631	if ((ifp->flags & IFA_F_PERMANENT) &&
4632	(ifp->prefered_lft == INFINITY_LIFE_TIME))
4633	continue;
4634
4635	spin_lock(lock: &ifp->lock);
4636	/ We try to batch several events at once. /
4637	age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4638
4639	if ((ifp->flags&IFA_F_TEMPORARY) &&
4640	!(ifp->flags&IFA_F_TENTATIVE) &&
4641	ifp->prefered_lft != INFINITY_LIFE_TIME &&
4642	!ifp->regen_count && ifp->ifpub) {
4643	/ This is a non-regenerated temporary addr. /
4644
4645	unsigned long regen_advance = ipv6_get_regen_advance(idev: ifp->idev);
4646
4647	if (age + regen_advance >= ifp->prefered_lft) {
4648	struct inet6_ifaddr *ifpub = ifp->ifpub;
4649	if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4650	next = ifp->tstamp + ifp->prefered_lft * HZ;
4651
4652	ifp->regen_count++;
4653	in6_ifa_hold(ifp);
4654	in6_ifa_hold(ifp: ifpub);
4655	spin_unlock(lock: &ifp->lock);
4656
4657	spin_lock(lock: &ifpub->lock);
4658	ifpub->regen_count = `0`;
4659	spin_unlock(lock: &ifpub->lock);
4660	rcu_read_unlock_bh();
4661	ipv6_create_tempaddr(ifp: ifpub, block: true);
4662	in6_ifa_put(ifp: ifpub);
4663	in6_ifa_put(ifp);
4664	rcu_read_lock_bh();
4665	goto restart;
4666	} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4667	next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4668	}
4669
4670	if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4671	age >= ifp->valid_lft) {
4672	spin_unlock(lock: &ifp->lock);
4673	in6_ifa_hold(ifp);
4674	rcu_read_unlock_bh();
4675	ipv6_del_addr(ifp);
4676	rcu_read_lock_bh();
4677	goto restart;
4678	} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4679	spin_unlock(lock: &ifp->lock);
4680	continue;
4681	} else if (age >= ifp->prefered_lft) {
4682	/ jiffies - ifp->tstamp > age >= ifp->prefered_lft /
4683	int deprecate = `0`;
4684
4685	if (!(ifp->flags&IFA_F_DEPRECATED)) {
4686	deprecate = `1`;
4687	ifp->flags \|= IFA_F_DEPRECATED;
4688	}
4689
4690	if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4691	(time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4692	next = ifp->tstamp + ifp->valid_lft * HZ;
4693
4694	spin_unlock(lock: &ifp->lock);
4695
4696	if (deprecate) {
4697	in6_ifa_hold(ifp);
4698
4699	ipv6_ifa_notify(event: `0`, ifa: ifp);
4700	in6_ifa_put(ifp);
4701	goto restart;
4702	}
4703	} else {
4704	/ ifp->prefered_lft <= ifp->valid_lft /
4705	if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4706	next = ifp->tstamp + ifp->prefered_lft * HZ;
4707	spin_unlock(lock: &ifp->lock);
4708	}
4709	}
4710	}
4711
4712	next_sec = round_jiffies_up(j: next);
4713	next_sched = next;
4714
4715	/ If rounded timeout is accurate enough, accept it. /
4716	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4717	next_sched = next_sec;
4718
4719	/ And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. /
4720	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4721	next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4722
4723	pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4724	now, next, next_sec, next_sched);
4725	mod_delayed_work(wq: addrconf_wq, dwork: &net->ipv6.addr_chk_work, delay: next_sched - now);
4726	rcu_read_unlock_bh();
4727	}
4728
4729	static void addrconf_verify_work(struct work_struct *w)
4730	{
4731	struct net net = container_of(to_delayed_work(w), struct* net,
4732	ipv6.addr_chk_work);
4733
4734	rtnl_net_lock(net);
4735	addrconf_verify_rtnl(net);
4736	rtnl_net_unlock(net);
4737	}
4738
4739	static void addrconf_verify(struct net *net)
4740	{
4741	mod_delayed_work(wq: addrconf_wq, dwork: &net->ipv6.addr_chk_work, delay: `0`);
4742	}
4743
4744	static struct in6_addr extract_addr(struct* nlattr addr, struct* nlattr *local,
4745	struct in6_addr **peer_pfx)
4746	{
4747	struct in6_addr *pfx = NULL;
4748
4749	*peer_pfx = NULL;
4750
4751	if (addr)
4752	pfx = nla_data(nla: addr);
4753
4754	if (local) {
4755	if (pfx && nla_memcmp(nla: local, data: pfx, size: sizeof(*pfx)))
4756	*peer_pfx = pfx;
4757	pfx = nla_data(nla: local);
4758	}
4759
4760	return pfx;
4761	}
4762
4763	static const struct nla_policy ifa_ipv6_policy[IFA_MAX+`1`] = {
4764	[IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4765	[IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4766	[IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4767	[IFA_FLAGS] = { .len = sizeof(u32) },
4768	[IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4769	[IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4770	[IFA_PROTO] = { .type = NLA_U8 },
4771	};
4772
4773	static int
4774	inet6_rtm_deladdr(struct sk_buff skb, struct* nlmsghdr *nlh,
4775	struct netlink_ext_ack *extack)
4776	{
4777	struct net *net = sock_net(sk: skb->sk);
4778	struct ifaddrmsg *ifm;
4779	struct nlattr *tb[IFA_MAX+`1`];
4780	struct in6_addr pfx, peer_pfx;
4781	u32 ifa_flags;
4782	int err;
4783
4784	err = nlmsg_parse_deprecated(nlh, hdrlen: sizeof(*ifm), tb, IFA_MAX,
4785	policy: ifa_ipv6_policy, extack);
4786	if (err < `0`)
4787	return err;
4788
4789	ifm = nlmsg_data(nlh);
4790	pfx = extract_addr(addr: tb[IFA_ADDRESS], local: tb[IFA_LOCAL], peer_pfx: &peer_pfx);
4791	if (!pfx)
4792	return -EINVAL;
4793
4794	ifa_flags = nla_get_u32_default(nla: tb[IFA_FLAGS], defvalue: ifm->ifa_flags);
4795
4796	/ We ignore other flags so far. /
4797	ifa_flags &= IFA_F_MANAGETEMPADDR;
4798
4799	rtnl_net_lock(net);
4800	err = inet6_addr_del(net, ifindex: ifm->ifa_index, ifa_flags, pfx,
4801	plen: ifm->ifa_prefixlen, extack);
4802	rtnl_net_unlock(net);
4803
4804	return err;
4805	}
4806
4807	static int modify_prefix_route(struct net net, struct* inet6_ifaddr *ifp,
4808	unsigned long expires, u32 flags,
4809	bool modify_peer)
4810	{
4811	struct fib6_table *table;
4812	struct fib6_info *f6i;
4813	u32 prio;
4814
4815	f6i = addrconf_get_prefix_route(pfx: modify_peer ? &ifp->peer_addr : &ifp->addr,
4816	plen: ifp->prefix_len,
4817	dev: ifp->idev->dev, flags: `0`, RTF_DEFAULT, no_gw: true);
4818	if (!f6i)
4819	return -ENOENT;
4820
4821	prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4822	if (f6i->fib6_metric != prio) {
4823	/ delete old one /
4824	ip6_del_rt(net: dev_net(dev: ifp->idev->dev), f6i, skip_notify: false);
4825
4826	/ add new one /
4827	addrconf_prefix_route(pfx: modify_peer ? &ifp->peer_addr : &ifp->addr,
4828	plen: ifp->prefix_len,
4829	metric: ifp->rt_priority, dev: ifp->idev->dev,
4830	expires, flags, GFP_KERNEL);
4831	return `0`;
4832	}
4833	if (f6i != net->ipv6.fib6_null_entry) {
4834	table = f6i->fib6_table;
4835	spin_lock_bh(lock: &table->tb6_lock);
4836
4837	if (!(flags & RTF_EXPIRES)) {
4838	fib6_clean_expires(f6i);
4839	fib6_remove_gc_list(f6i);
4840	} else {
4841	fib6_set_expires(f6i, expires);
4842	fib6_add_gc_list(f6i);
4843	}
4844
4845	spin_unlock_bh(lock: &table->tb6_lock);
4846	}
4847	fib6_info_release(f6i);
4848
4849	return `0`;
4850	}
4851
4852	static int inet6_addr_modify(struct net net, struct* inet6_ifaddr *ifp,
4853	struct ifa6_config *cfg, clock_t expires,
4854	u32 flags)
4855	{
4856	bool was_managetempaddr;
4857	bool new_peer = false;
4858	bool had_prefixroute;
4859
4860	ASSERT_RTNL_NET(net);
4861
4862	if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4863	(ifp->flags & IFA_F_TEMPORARY \|\| ifp->prefix_len != `64`))
4864	return -EINVAL;
4865
4866	if (!(ifp->flags & IFA_F_TENTATIVE) \|\| ifp->flags & IFA_F_DADFAILED)
4867	cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4868
4869	if (cfg->peer_pfx &&
4870	memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4871	if (!ipv6_addr_any(a: &ifp->peer_addr))
4872	cleanup_prefix_route(ifp, expires, del_rt: true, del_peer: true);
4873	new_peer = true;
4874	}
4875
4876	spin_lock_bh(lock: &ifp->lock);
4877	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4878	had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4879	!(ifp->flags & IFA_F_NOPREFIXROUTE);
4880	ifp->flags &= ~(IFA_F_DEPRECATED \| IFA_F_PERMANENT \| IFA_F_NODAD \|
4881	IFA_F_HOMEADDRESS \| IFA_F_MANAGETEMPADDR \|
4882	IFA_F_NOPREFIXROUTE);
4883	ifp->flags \|= cfg->ifa_flags;
4884	WRITE_ONCE(ifp->tstamp, jiffies);
4885	WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4886	WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4887	WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4888
4889	if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4890	WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4891
4892	if (new_peer)
4893	ifp->peer_addr = *cfg->peer_pfx;
4894
4895	spin_unlock_bh(lock: &ifp->lock);
4896	if (!(ifp->flags&IFA_F_TENTATIVE))
4897	ipv6_ifa_notify(event: `0`, ifa: ifp);
4898
4899	if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4900	int rc = -ENOENT;
4901
4902	if (had_prefixroute)
4903	rc = modify_prefix_route(net, ifp, expires, flags, modify_peer: false);
4904
4905	/ prefix route could have been deleted; if so restore it /
4906	if (rc == -ENOENT) {
4907	addrconf_prefix_route(pfx: &ifp->addr, plen: ifp->prefix_len,
4908	metric: ifp->rt_priority, dev: ifp->idev->dev,
4909	expires, flags, GFP_KERNEL);
4910	}
4911
4912	if (had_prefixroute && !ipv6_addr_any(a: &ifp->peer_addr))
4913	rc = modify_prefix_route(net, ifp, expires, flags, modify_peer: true);
4914
4915	if (rc == -ENOENT && !ipv6_addr_any(a: &ifp->peer_addr)) {
4916	addrconf_prefix_route(pfx: &ifp->peer_addr, plen: ifp->prefix_len,
4917	metric: ifp->rt_priority, dev: ifp->idev->dev,
4918	expires, flags, GFP_KERNEL);
4919	}
4920	} else if (had_prefixroute) {
4921	enum cleanup_prefix_rt_t action;
4922	unsigned long rt_expires;
4923
4924	write_lock_bh(&ifp->idev->lock);
4925	action = check_cleanup_prefix_route(ifp, expires: &rt_expires);
4926	write_unlock_bh(&ifp->idev->lock);
4927
4928	if (action != CLEANUP_PREFIX_RT_NOP) {
4929	cleanup_prefix_route(ifp, expires: rt_expires,
4930	del_rt: action == CLEANUP_PREFIX_RT_DEL, del_peer: false);
4931	}
4932	}
4933
4934	if (was_managetempaddr \|\| ifp->flags & IFA_F_MANAGETEMPADDR) {
4935	if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4936	delete_tempaddrs(idev: ifp->idev, ifp);
4937	else
4938	manage_tempaddrs(idev: ifp->idev, ifp, valid_lft: cfg->valid_lft,
4939	prefered_lft: cfg->preferred_lft, create: !was_managetempaddr,
4940	now: jiffies);
4941	}
4942
4943	addrconf_verify_rtnl(net);
4944
4945	return `0`;
4946	}
4947
4948	static int
4949	inet6_rtm_newaddr(struct sk_buff skb, struct* nlmsghdr *nlh,
4950	struct netlink_ext_ack *extack)
4951	{
4952	struct net *net = sock_net(sk: skb->sk);
4953	struct nlattr *tb[IFA_MAX+`1`];
4954	struct in6_addr *peer_pfx;
4955	struct inet6_ifaddr *ifa;
4956	struct net_device *dev;
4957	struct inet6_dev *idev;
4958	struct ifa6_config cfg;
4959	struct ifaddrmsg *ifm;
4960	unsigned long timeout;
4961	clock_t expires;
4962	u32 flags;
4963	int err;
4964
4965	err = nlmsg_parse_deprecated(nlh, hdrlen: sizeof(*ifm), tb, IFA_MAX,
4966	policy: ifa_ipv6_policy, extack);
4967	if (err < `0`)
4968	return err;
4969
4970	memset(s: &cfg, c: `0`, n: sizeof(cfg));
4971
4972	ifm = nlmsg_data(nlh);
4973	cfg.pfx = extract_addr(addr: tb[IFA_ADDRESS], local: tb[IFA_LOCAL], peer_pfx: &peer_pfx);
4974	if (!cfg.pfx)
4975	return -EINVAL;
4976
4977	cfg.peer_pfx = peer_pfx;
4978	cfg.plen = ifm->ifa_prefixlen;
4979	if (tb[IFA_RT_PRIORITY])
4980	cfg.rt_priority = nla_get_u32(nla: tb[IFA_RT_PRIORITY]);
4981
4982	if (tb[IFA_PROTO])
4983	cfg.ifa_proto = nla_get_u8(nla: tb[IFA_PROTO]);
4984
4985	cfg.ifa_flags = nla_get_u32_default(nla: tb[IFA_FLAGS], defvalue: ifm->ifa_flags);
4986
4987	/ We ignore other flags so far. /
4988	cfg.ifa_flags &= IFA_F_NODAD \| IFA_F_HOMEADDRESS \|
4989	IFA_F_MANAGETEMPADDR \| IFA_F_NOPREFIXROUTE \|
4990	IFA_F_MCAUTOJOIN \| IFA_F_OPTIMISTIC;
4991
4992	cfg.ifa_flags \|= IFA_F_PERMANENT;
4993	cfg.valid_lft = INFINITY_LIFE_TIME;
4994	cfg.preferred_lft = INFINITY_LIFE_TIME;
4995	expires = `0`;
4996	flags = `0`;
4997
4998	if (tb[IFA_CACHEINFO]) {
4999	struct ifa_cacheinfo *ci;
5000
5001	ci = nla_data(nla: tb[IFA_CACHEINFO]);
5002	cfg.valid_lft = ci->ifa_valid;
5003	cfg.preferred_lft = ci->ifa_prefered;
5004
5005	if (!cfg.valid_lft \|\| cfg.preferred_lft > cfg.valid_lft) {
5006	NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
5007	return -EINVAL;
5008	}
5009
5010	timeout = addrconf_timeout_fixup(timeout: cfg.valid_lft, HZ);
5011	if (addrconf_finite_timeout(timeout)) {
5012	cfg.ifa_flags &= ~IFA_F_PERMANENT;
5013	cfg.valid_lft = timeout;
5014	expires = jiffies_to_clock_t(x: timeout * HZ);
5015	flags = RTF_EXPIRES;
5016	}
5017
5018	timeout = addrconf_timeout_fixup(timeout: cfg.preferred_lft, HZ);
5019	if (addrconf_finite_timeout(timeout)) {
5020	if (timeout == `0`)
5021	cfg.ifa_flags \|= IFA_F_DEPRECATED;
5022
5023	cfg.preferred_lft = timeout;
5024	}
5025	}
5026
5027	rtnl_net_lock(net);
5028
5029	dev = __dev_get_by_index(net, ifindex: ifm->ifa_index);
5030	if (!dev) {
5031	NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5032	err = -ENODEV;
5033	goto unlock_rtnl;
5034	}
5035
5036	netdev_lock_ops(dev);
5037	idev = ipv6_find_idev(dev);
5038	if (IS_ERR(ptr: idev)) {
5039	err = PTR_ERR(ptr: idev);
5040	goto unlock;
5041	}
5042
5043	if (!ipv6_allow_optimistic_dad(net, idev))
5044	cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5045
5046	if (cfg.ifa_flags & IFA_F_NODAD &&
5047	cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5048	NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5049	err = -EINVAL;
5050	goto unlock;
5051	}
5052
5053	ifa = ipv6_get_ifaddr(net, addr: cfg.pfx, dev, strict: `1`);
5054	if (!ifa) {
5055	/*
5056	* It would be best to check for !NLM_F_CREATE here but
5057	* userspace already relies on not having to provide this.
5058	*/
5059	err = inet6_addr_add(net, dev, cfg: &cfg, expires, flags, extack);
5060	goto unlock;
5061	}
5062
5063	if (nlh->nlmsg_flags & NLM_F_EXCL \|\|
5064	!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5065	NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5066	err = -EEXIST;
5067	} else {
5068	err = inet6_addr_modify(net, ifp: ifa, cfg: &cfg, expires, flags);
5069	}
5070
5071	in6_ifa_put(ifp: ifa);
5072	unlock:
5073	netdev_unlock_ops(dev);
5074	unlock_rtnl:
5075	rtnl_net_unlock(net);
5076
5077	return err;
5078	}
5079
5080	static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5081	u8 scope, int ifindex)
5082	{
5083	struct ifaddrmsg *ifm;
5084
5085	ifm = nlmsg_data(nlh);
5086	ifm->ifa_family = AF_INET6;
5087	ifm->ifa_prefixlen = prefixlen;
5088	ifm->ifa_flags = flags;
5089	ifm->ifa_scope = scope;
5090	ifm->ifa_index = ifindex;
5091	}
5092
5093	static int put_cacheinfo(struct sk_buff skb, unsigned* long cstamp,
5094	unsigned long tstamp, u32 preferred, u32 valid)
5095	{
5096	struct ifa_cacheinfo ci;
5097
5098	ci.cstamp = cstamp_delta(cstamp);
5099	ci.tstamp = cstamp_delta(cstamp: tstamp);
5100	ci.ifa_prefered = preferred;
5101	ci.ifa_valid = valid;
5102
5103	return nla_put(skb, attrtype: IFA_CACHEINFO, attrlen: sizeof(ci), data: &ci);
5104	}
5105
5106	static inline int rt_scope(int ifa_scope)
5107	{
5108	if (ifa_scope & IFA_HOST)
5109	return RT_SCOPE_HOST;
5110	else if (ifa_scope & IFA_LINK)
5111	return RT_SCOPE_LINK;
5112	else if (ifa_scope & IFA_SITE)
5113	return RT_SCOPE_SITE;
5114	else
5115	return RT_SCOPE_UNIVERSE;
5116	}
5117
5118	static inline int inet6_ifaddr_msgsize(void)
5119	{
5120	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5121	+ nla_total_size(payload: `16`) / IFA_LOCAL /
5122	+ nla_total_size(payload: `16`) / IFA_ADDRESS /
5123	+ nla_total_size(payload: sizeof(struct ifa_cacheinfo))
5124	+ nla_total_size(payload: `4`) / IFA_FLAGS /
5125	+ nla_total_size(payload: `1`) / IFA_PROTO /
5126	+ nla_total_size(payload: `4`) / IFA_RT_PRIORITY /;
5127	}
5128
5129	static int inet6_fill_ifaddr(struct sk_buff *skb,
5130	const struct inet6_ifaddr *ifa,
5131	struct inet6_fill_args *args)
5132	{
5133	struct nlmsghdr *nlh;
5134	u32 preferred, valid;
5135	u32 flags, priority;
5136	u8 proto;
5137
5138	nlh = nlmsg_put(skb, portid: args->portid, seq: args->seq, type: args->event,
5139	payload: sizeof(struct ifaddrmsg), flags: args->flags);
5140	if (!nlh)
5141	return -EMSGSIZE;
5142
5143	flags = READ_ONCE(ifa->flags);
5144	put_ifaddrmsg(nlh, prefixlen: ifa->prefix_len, flags: ifa->flags, scope: rt_scope(ifa_scope: ifa->scope),
5145	ifindex: ifa->idev->dev->ifindex);
5146
5147	if (args->netnsid >= `0` &&
5148	nla_put_s32(skb, attrtype: IFA_TARGET_NETNSID, value: args->netnsid))
5149	goto error;
5150
5151	preferred = READ_ONCE(ifa->prefered_lft);
5152	valid = READ_ONCE(ifa->valid_lft);
5153
5154	if (!((flags & IFA_F_PERMANENT) &&
5155	(preferred == INFINITY_LIFE_TIME))) {
5156	if (preferred != INFINITY_LIFE_TIME) {
5157	long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5158
5159	if (preferred > tval)
5160	preferred -= tval;
5161	else
5162	preferred = `0`;
5163	if (valid != INFINITY_LIFE_TIME) {
5164	if (valid > tval)
5165	valid -= tval;
5166	else
5167	valid = `0`;
5168	}
5169	}
5170	} else {
5171	preferred = INFINITY_LIFE_TIME;
5172	valid = INFINITY_LIFE_TIME;
5173	}
5174
5175	if (!ipv6_addr_any(a: &ifa->peer_addr)) {
5176	if (nla_put_in6_addr(skb, attrtype: IFA_LOCAL, addr: &ifa->addr) < `0` \|\|
5177	nla_put_in6_addr(skb, attrtype: IFA_ADDRESS, addr: &ifa->peer_addr) < `0`)
5178	goto error;
5179	} else {
5180	if (nla_put_in6_addr(skb, attrtype: IFA_ADDRESS, addr: &ifa->addr) < `0`)
5181	goto error;
5182	}
5183
5184	priority = READ_ONCE(ifa->rt_priority);
5185	if (priority && nla_put_u32(skb, attrtype: IFA_RT_PRIORITY, value: priority))
5186	goto error;
5187
5188	if (put_cacheinfo(skb, cstamp: ifa->cstamp, READ_ONCE(ifa->tstamp),
5189	preferred, valid) < `0`)
5190	goto error;
5191
5192	if (nla_put_u32(skb, attrtype: IFA_FLAGS, value: flags) < `0`)
5193	goto error;
5194
5195	proto = READ_ONCE(ifa->ifa_proto);
5196	if (proto && nla_put_u8(skb, attrtype: IFA_PROTO, value: proto))
5197	goto error;
5198
5199	nlmsg_end(skb, nlh);
5200	return `0`;
5201
5202	error:
5203	nlmsg_cancel(skb, nlh);
5204	return -EMSGSIZE;
5205	}
5206
5207	int inet6_fill_ifmcaddr(struct sk_buff *skb,
5208	const struct ifmcaddr6 *ifmca,
5209	struct inet6_fill_args *args)
5210	{
5211	int ifindex = ifmca->idev->dev->ifindex;
5212	u8 scope = RT_SCOPE_UNIVERSE;
5213	struct nlmsghdr *nlh;
5214
5215	if (!args->force_rt_scope_universe &&
5216	ipv6_addr_scope(addr: &ifmca->mca_addr) & IFA_SITE)
5217	scope = RT_SCOPE_SITE;
5218
5219	nlh = nlmsg_put(skb, portid: args->portid, seq: args->seq, type: args->event,
5220	payload: sizeof(struct ifaddrmsg), flags: args->flags);
5221	if (!nlh)
5222	return -EMSGSIZE;
5223
5224	if (args->netnsid >= `0` &&
5225	nla_put_s32(skb, attrtype: IFA_TARGET_NETNSID, value: args->netnsid)) {
5226	nlmsg_cancel(skb, nlh);
5227	return -EMSGSIZE;
5228	}
5229
5230	put_ifaddrmsg(nlh, prefixlen: `128`, IFA_F_PERMANENT, scope, ifindex);
5231	if (nla_put_in6_addr(skb, attrtype: IFA_MULTICAST, addr: &ifmca->mca_addr) < `0` \|\|
5232	put_cacheinfo(skb, cstamp: ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5233	INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < `0`) {
5234	nlmsg_cancel(skb, nlh);
5235	return -EMSGSIZE;
5236	}
5237
5238	nlmsg_end(skb, nlh);
5239	return `0`;
5240	}
5241
5242	int inet6_fill_ifacaddr(struct sk_buff *skb,
5243	const struct ifacaddr6 *ifaca,
5244	struct inet6_fill_args *args)
5245	{
5246	struct net_device *dev = fib6_info_nh_dev(f6i: ifaca->aca_rt);
5247	int ifindex = dev ? dev->ifindex : `1`;
5248	u8 scope = RT_SCOPE_UNIVERSE;
5249	struct nlmsghdr *nlh;
5250
5251	if (ipv6_addr_scope(addr: &ifaca->aca_addr) & IFA_SITE)
5252	scope = RT_SCOPE_SITE;
5253
5254	nlh = nlmsg_put(skb, portid: args->portid, seq: args->seq, type: args->event,
5255	payload: sizeof(struct ifaddrmsg), flags: args->flags);
5256	if (!nlh)
5257	return -EMSGSIZE;
5258
5259	if (args->netnsid >= `0` &&
5260	nla_put_s32(skb, attrtype: IFA_TARGET_NETNSID, value: args->netnsid)) {
5261	nlmsg_cancel(skb, nlh);
5262	return -EMSGSIZE;
5263	}
5264
5265	put_ifaddrmsg(nlh, prefixlen: `128`, IFA_F_PERMANENT, scope, ifindex);
5266	if (nla_put_in6_addr(skb, attrtype: IFA_ANYCAST, addr: &ifaca->aca_addr) < `0` \|\|
5267	put_cacheinfo(skb, cstamp: ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5268	INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < `0`) {
5269	nlmsg_cancel(skb, nlh);
5270	return -EMSGSIZE;
5271	}
5272
5273	nlmsg_end(skb, nlh);
5274	return `0`;
5275	}
5276
5277	/ called with rcu_read_lock() /
5278	static int in6_dump_addrs(const struct inet6_dev idev, struct* sk_buff *skb,
5279	struct netlink_callback cb, int* *s_ip_idx,
5280	struct inet6_fill_args *fillargs)
5281	{
5282	const struct ifmcaddr6 *ifmca;
5283	const struct ifacaddr6 *ifaca;
5284	int ip_idx = `0`;
5285	int err = `0`;
5286
5287	switch (fillargs->type) {
5288	case UNICAST_ADDR: {
5289	const struct inet6_ifaddr *ifa;
5290	fillargs->event = RTM_NEWADDR;
5291
5292	/ unicast address incl. temp addr /
5293	list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5294	if (ip_idx < *s_ip_idx)
5295	goto next;
5296	err = inet6_fill_ifaddr(skb, ifa, args: fillargs);
5297	if (err < `0`)
5298	break;
5299	nl_dump_check_consistent(cb, nlh: nlmsg_hdr(skb));
5300	next:
5301	ip_idx++;
5302	}
5303	break;
5304	}
5305	case MULTICAST_ADDR:
5306	fillargs->event = RTM_GETMULTICAST;
5307
5308	/ multicast address /
5309	for (ifmca = rcu_dereference(idev->mc_list);
5310	ifmca;
5311	ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5312	if (ip_idx < *s_ip_idx)
5313	continue;
5314	err = inet6_fill_ifmcaddr(skb, ifmca, args: fillargs);
5315	if (err < `0`)
5316	break;
5317	}
5318	break;
5319	case ANYCAST_ADDR:
5320	fillargs->event = RTM_GETANYCAST;
5321	/ anycast address /
5322	for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5323	ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5324	if (ip_idx < *s_ip_idx)
5325	continue;
5326	err = inet6_fill_ifacaddr(skb, ifaca, args: fillargs);
5327	if (err < `0`)
5328	break;
5329	}
5330	break;
5331	default:
5332	break;
5333	}
5334	*s_ip_idx = err ? ip_idx : `0`;
5335	return err;
5336	}
5337
5338	static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5339	struct inet6_fill_args *fillargs,
5340	struct net tgt_net, struct** sock *sk,
5341	struct netlink_callback *cb)
5342	{
5343	struct netlink_ext_ack *extack = cb->extack;
5344	struct nlattr *tb[IFA_MAX+`1`];
5345	struct ifaddrmsg *ifm;
5346	int err, i;
5347
5348	ifm = nlmsg_payload(nlh, len: sizeof(*ifm));
5349	if (!ifm) {
5350	NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5351	return -EINVAL;
5352	}
5353
5354	if (ifm->ifa_prefixlen \|\| ifm->ifa_flags \|\| ifm->ifa_scope) {
5355	NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5356	return -EINVAL;
5357	}
5358
5359	fillargs->ifindex = ifm->ifa_index;
5360	if (fillargs->ifindex) {
5361	cb->answer_flags \|= NLM_F_DUMP_FILTERED;
5362	fillargs->flags \|= NLM_F_DUMP_FILTERED;
5363	}
5364
5365	err = nlmsg_parse_deprecated_strict(nlh, hdrlen: sizeof(*ifm), tb, IFA_MAX,
5366	policy: ifa_ipv6_policy, extack);
5367	if (err < `0`)
5368	return err;
5369
5370	for (i = `0`; i <= IFA_MAX; ++i) {
5371	if (!tb[i])
5372	continue;
5373
5374	if (i == IFA_TARGET_NETNSID) {
5375	struct net *net;
5376
5377	fillargs->netnsid = nla_get_s32(nla: tb[i]);
5378	net = rtnl_get_net_ns_capable(sk, netnsid: fillargs->netnsid);
5379	if (IS_ERR(ptr: net)) {
5380	fillargs->netnsid = -`1`;
5381	NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5382	return PTR_ERR(ptr: net);
5383	}
5384	*tgt_net = net;
5385	} else {
5386	NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5387	return -EINVAL;
5388	}
5389	}
5390
5391	return `0`;
5392	}
5393
5394	static int inet6_dump_addr(struct sk_buff skb, struct* netlink_callback *cb,
5395	enum addr_type_t type)
5396	{
5397	struct net *tgt_net = sock_net(sk: skb->sk);
5398	const struct nlmsghdr *nlh = cb->nlh;
5399	struct inet6_fill_args fillargs = {
5400	.portid = NETLINK_CB(cb->skb).portid,
5401	.seq = cb->nlh->nlmsg_seq,
5402	.flags = NLM_F_MULTI,
5403	.netnsid = -`1`,
5404	.type = type,
5405	.force_rt_scope_universe = false,
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: &fillargs, tgt_net: &tgt_net,
5418	sk: 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(net: tgt_net, ifindex: 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	s_ip_idx: &ctx->ip_idx,
5433	fillargs: &fillargs);
5434	goto done;
5435	}
5436	}
5437
5438	cb->seq = inet6_base_seq(net: 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, s_ip_idx: &ctx->ip_idx,
5444	fillargs: &fillargs);
5445	if (err < `0`)
5446	goto done;
5447	}
5448	done:
5449	rcu_read_unlock();
5450	if (fillargs.netnsid >= `0`)
5451	put_net(net: tgt_net);
5452
5453	return err;
5454	}
5455
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
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
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
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	ifm = nlmsg_payload(nlh, len: sizeof(*ifm));
5487	if (!ifm) {
5488	NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5489	return -EINVAL;
5490	}
5491
5492	if (!netlink_strict_get_check(skb))
5493	return nlmsg_parse_deprecated(nlh, hdrlen: sizeof(*ifm), tb, IFA_MAX,
5494	policy: ifa_ipv6_policy, extack);
5495
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, hdrlen: sizeof(*ifm), tb, IFA_MAX,
5502	policy: 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
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(sk: 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	.force_rt_scope_universe = false,
5535	};
5536	struct ifaddrmsg *ifm;
5537	struct nlattr *tb[IFA_MAX+`1`];
5538	struct in6_addr addr = NULL, peer;
5539	struct net_device *dev = NULL;
5540	struct inet6_ifaddr *ifa;
5541	struct sk_buff *skb;
5542	int err;
5543
5544	err = inet6_rtm_valid_getaddr_req(skb: in_skb, nlh, tb, extack);
5545	if (err < `0`)
5546	return err;
5547
5548	if (tb[IFA_TARGET_NETNSID]) {
5549	fillargs.netnsid = nla_get_s32(nla: tb[IFA_TARGET_NETNSID]);
5550
5551	tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5552	netnsid: fillargs.netnsid);
5553	if (IS_ERR(ptr: tgt_net))
5554	return PTR_ERR(ptr: tgt_net);
5555	}
5556
5557	addr = extract_addr(addr: tb[IFA_ADDRESS], local: tb[IFA_LOCAL], peer_pfx: &peer);
5558	if (!addr) {
5559	err = -EINVAL;
5560	goto errout;
5561	}
5562	ifm = nlmsg_data(nlh);
5563	if (ifm->ifa_index)
5564	dev = dev_get_by_index(net: tgt_net, ifindex: ifm->ifa_index);
5565
5566	ifa = ipv6_get_ifaddr(net: tgt_net, addr, dev, strict: `1`);
5567	if (!ifa) {
5568	err = -EADDRNOTAVAIL;
5569	goto errout;
5570	}
5571
5572	skb = nlmsg_new(payload: inet6_ifaddr_msgsize(), GFP_KERNEL);
5573	if (!skb) {
5574	err = -ENOBUFS;
5575	goto errout_ifa;
5576	}
5577
5578	err = inet6_fill_ifaddr(skb, ifa, args: &fillargs);
5579	if (err < `0`) {
5580	/ -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() /
5581	WARN_ON(err == -EMSGSIZE);
5582	kfree_skb(skb);
5583	goto errout_ifa;
5584	}
5585	err = rtnl_unicast(skb, net: tgt_net, NETLINK_CB(in_skb).portid);
5586	errout_ifa:
5587	in6_ifa_put(ifp: ifa);
5588	errout:
5589	dev_put(dev);
5590	if (fillargs.netnsid >= `0`)
5591	put_net(net: tgt_net);
5592
5593	return err;
5594	}
5595
5596	static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5597	{
5598	struct sk_buff *skb;
5599	struct net *net = dev_net(dev: ifa->idev->dev);
5600	struct inet6_fill_args fillargs = {
5601	.portid = `0`,
5602	.seq = `0`,
5603	.event = event,
5604	.flags = `0`,
5605	.netnsid = -`1`,
5606	.force_rt_scope_universe = false,
5607	};
5608	int err = -ENOBUFS;
5609
5610	skb = nlmsg_new(payload: inet6_ifaddr_msgsize(), GFP_ATOMIC);
5611	if (!skb)
5612	goto errout;
5613
5614	err = inet6_fill_ifaddr(skb, ifa, args: &fillargs);
5615	if (err < `0`) {
5616	/ -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() /
5617	WARN_ON(err == -EMSGSIZE);
5618	kfree_skb(skb);
5619	goto errout;
5620	}
5621	rtnl_notify(skb, net, pid: `0`, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5622	return;
5623	errout:
5624	rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, error: err);
5625	}
5626
5627	static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5628	__s32 array, int* bytes)
5629	{
5630	BUG_ON(bytes < (DEVCONF_MAX * `4`));
5631
5632	memset(s: array, c: `0`, n: bytes);
5633	array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5634	array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5635	array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5636	array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5637	array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5638	array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5639	array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5640	array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5641	array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5642	jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5643	array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5644	jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5645	array[DEVCONF_RTR_SOLICIT_DELAY] =
5646	jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5647	array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5648	array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5649	jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5650	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5651	jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5652	array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5653	array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5654	array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5655	array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5656	array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5657	array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5658	array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5659	array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5660	array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5661	READ_ONCE(cnf->accept_ra_min_hop_limit);
5662	array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5663	#ifdef CONFIG_IPV6_ROUTER_PREF
5664	array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5665	array[DEVCONF_RTR_PROBE_INTERVAL] =
5666	jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5667	#ifdef CONFIG_IPV6_ROUTE_INFO
5668	array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5669	READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5670	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5671	READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5672	#endif
5673	#endif
5674	array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5675	array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5676	READ_ONCE(cnf->accept_source_route);
5677	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5678	array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5679	array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5680	#endif
5681	#ifdef CONFIG_IPV6_MROUTE
5682	array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5683	#endif
5684	array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5685	array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5686	array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5687	array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5688	array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5689	READ_ONCE(cnf->suppress_frag_ndisc);
5690	array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5691	READ_ONCE(cnf->accept_ra_from_local);
5692	array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5693	array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5694	READ_ONCE(cnf->ignore_routes_with_linkdown);
5695	/ we omit DEVCONF_STABLE_SECRET for now /
5696	array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5697	array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5698	READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5699	array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5700	array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5701	array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5702	#ifdef CONFIG_IPV6_SEG6_HMAC
5703	array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5704	#endif
5705	array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5706	array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5707	array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5708	array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5709	array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5710	array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5711	array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5712	array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5713	array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5714	READ_ONCE(cnf->ndisc_evict_nocarrier);
5715	array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5716	READ_ONCE(cnf->accept_untracked_na);
5717	array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5718	array[DEVCONF_FORCE_FORWARDING] = READ_ONCE(cnf->force_forwarding);
5719	}
5720
5721	static inline size_t inet6_ifla6_size(void)
5722	{
5723	return nla_total_size(payload: `4`) / IFLA_INET6_FLAGS /
5724	+ nla_total_size(payload: sizeof(struct ifla_cacheinfo))
5725	+ nla_total_size(payload: DEVCONF_MAX * `4`) / IFLA_INET6_CONF /
5726	+ nla_total_size(IPSTATS_MIB_MAX * `8`) / IFLA_INET6_STATS /
5727	+ nla_total_size(ICMP6_MIB_MAX * `8`) / IFLA_INET6_ICMP6STATS /
5728	+ nla_total_size(payload: sizeof(struct in6_addr)) / IFLA_INET6_TOKEN /
5729	+ nla_total_size(payload: `1`) / IFLA_INET6_ADDR_GEN_MODE /
5730	+ nla_total_size(payload: `4`) / IFLA_INET6_RA_MTU /
5731	+ `0`;
5732	}
5733
5734	static inline size_t inet6_if_nlmsg_size(void)
5735	{
5736	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5737	+ nla_total_size(IFNAMSIZ) / IFLA_IFNAME /
5738	+ nla_total_size(MAX_ADDR_LEN) / IFLA_ADDRESS /
5739	+ nla_total_size(payload: `4`) / IFLA_MTU /
5740	+ nla_total_size(payload: `4`) / IFLA_LINK /
5741	+ nla_total_size(payload: `1`) / IFLA_OPERSTATE /
5742	+ nla_total_size(payload: inet6_ifla6_size()); / IFLA_PROTINFO /
5743	}
5744
5745	static inline void __snmp6_fill_statsdev(u64 stats, atomic_long_t mib,
5746	int bytes)
5747	{
5748	int i;
5749	int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5750	BUG_ON(pad < `0`);
5751
5752	/ Use put_unaligned() because stats may not be aligned for u64. /
5753	put_unaligned(ICMP6_MIB_MAX, &stats[`0`]);
5754	for (i = `1`; i < ICMP6_MIB_MAX; i++)
5755	put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5756
5757	memset(s: &stats[ICMP6_MIB_MAX], c: `0`, n: pad);
5758	}
5759
5760	static inline void __snmp6_fill_stats64(u64 stats, void* __percpu *mib,
5761	int bytes, size_t syncpoff)
5762	{
5763	int i, c;
5764	u64 buff[IPSTATS_MIB_MAX];
5765	int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5766
5767	BUG_ON(pad < `0`);
5768
5769	memset(s: buff, c: `0`, n: sizeof(buff));
5770	buff[`0`] = IPSTATS_MIB_MAX;
5771
5772	for_each_possible_cpu(c) {
5773	for (i = `1`; i < IPSTATS_MIB_MAX; i++)
5774	buff[i] += snmp_get_cpu_field64(mib, cpu: c, offct: i, syncp_offset: syncpoff);
5775	}
5776
5777	memcpy(to: stats, from: buff, IPSTATS_MIB_MAX * sizeof(u64));
5778	memset(s: &stats[IPSTATS_MIB_MAX], c: `0`, n: pad);
5779	}
5780
5781	static void snmp6_fill_stats(u64 stats, struct* inet6_dev idev, int* attrtype,
5782	int bytes)
5783	{
5784	switch (attrtype) {
5785	case IFLA_INET6_STATS:
5786	__snmp6_fill_stats64(stats, mib: idev->stats.ipv6, bytes,
5787	offsetof(struct ipstats_mib, syncp));
5788	break;
5789	case IFLA_INET6_ICMP6STATS:
5790	__snmp6_fill_statsdev(stats, mib: idev->stats.icmpv6dev->mibs, bytes);
5791	break;
5792	}
5793	}
5794
5795	static int inet6_fill_ifla6_stats_attrs(struct sk_buff *skb,
5796	struct inet6_dev *idev)
5797	{
5798	struct nlattr *nla;
5799
5800	nla = nla_reserve(skb, attrtype: IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5801	if (!nla)
5802	goto nla_put_failure;
5803	snmp6_fill_stats(stats: nla_data(nla), idev, attrtype: IFLA_INET6_STATS, bytes: nla_len(nla));
5804
5805	nla = nla_reserve(skb, attrtype: IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5806	if (!nla)
5807	goto nla_put_failure;
5808	snmp6_fill_stats(stats: nla_data(nla), idev, attrtype: IFLA_INET6_ICMP6STATS, bytes: nla_len(nla));
5809
5810	return `0`;
5811
5812	nla_put_failure:
5813	return -EMSGSIZE;
5814	}
5815
5816	static int inet6_fill_ifla6_attrs(struct sk_buff skb, struct* inet6_dev *idev,
5817	u32 ext_filter_mask)
5818	{
5819	struct ifla_cacheinfo ci;
5820	struct nlattr *nla;
5821	u32 ra_mtu;
5822
5823	if (nla_put_u32(skb, attrtype: IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5824	goto nla_put_failure;
5825	ci.max_reasm_len = IPV6_MAXPLEN;
5826	ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5827	ci.reachable_time = jiffies_to_msecs(j: idev->nd_parms->reachable_time);
5828	ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5829	if (nla_put(skb, attrtype: IFLA_INET6_CACHEINFO, attrlen: sizeof(ci), data: &ci))
5830	goto nla_put_failure;
5831	nla = nla_reserve(skb, attrtype: IFLA_INET6_CONF, attrlen: DEVCONF_MAX * sizeof(s32));
5832	if (!nla)
5833	goto nla_put_failure;
5834	ipv6_store_devconf(cnf: &idev->cnf, array: nla_data(nla), bytes: nla_len(nla));
5835
5836	/ XXX - MC not implemented /
5837
5838	if (!(ext_filter_mask & RTEXT_FILTER_SKIP_STATS)) {
5839	if (inet6_fill_ifla6_stats_attrs(skb, idev) < `0`)
5840	goto nla_put_failure;
5841	}
5842
5843	nla = nla_reserve(skb, attrtype: IFLA_INET6_TOKEN, attrlen: sizeof(struct in6_addr));
5844	if (!nla)
5845	goto nla_put_failure;
5846	read_lock_bh(&idev->lock);
5847	memcpy(to: nla_data(nla), from: idev->token.s6_addr, len: nla_len(nla));
5848	read_unlock_bh(&idev->lock);
5849
5850	if (nla_put_u8(skb, attrtype: IFLA_INET6_ADDR_GEN_MODE,
5851	READ_ONCE(idev->cnf.addr_gen_mode)))
5852	goto nla_put_failure;
5853
5854	ra_mtu = READ_ONCE(idev->ra_mtu);
5855	if (ra_mtu && nla_put_u32(skb, attrtype: IFLA_INET6_RA_MTU, value: ra_mtu))
5856	goto nla_put_failure;
5857
5858	return `0`;
5859
5860	nla_put_failure:
5861	return -EMSGSIZE;
5862	}
5863
5864	static size_t inet6_get_link_af_size(const struct net_device *dev,
5865	u32 ext_filter_mask)
5866	{
5867	if (!__in6_dev_get(dev))
5868	return `0`;
5869
5870	return inet6_ifla6_size();
5871	}
5872
5873	static int inet6_fill_link_af(struct sk_buff skb, const* struct net_device *dev,
5874	u32 ext_filter_mask)
5875	{
5876	struct inet6_dev *idev = __in6_dev_get(dev);
5877
5878	if (!idev)
5879	return -ENODATA;
5880
5881	if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < `0`)
5882	return -EMSGSIZE;
5883
5884	return `0`;
5885	}
5886
5887	static int inet6_set_iftoken(struct inet6_dev idev, struct* in6_addr *token,
5888	struct netlink_ext_ack *extack)
5889	{
5890	struct inet6_ifaddr *ifp;
5891	struct net_device *dev = idev->dev;
5892	bool clear_token, update_rs = false;
5893	struct in6_addr ll_addr;
5894
5895	ASSERT_RTNL();
5896
5897	if (!token)
5898	return -EINVAL;
5899
5900	if (dev->flags & IFF_LOOPBACK) {
5901	NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5902	return -EINVAL;
5903	}
5904
5905	if (dev->flags & IFF_NOARP) {
5906	NL_SET_ERR_MSG_MOD(extack,
5907	"Device does not do neighbour discovery");
5908	return -EINVAL;
5909	}
5910
5911	if (!ipv6_accept_ra(idev)) {
5912	NL_SET_ERR_MSG_MOD(extack,
5913	"Router advertisement is disabled on device");
5914	return -EINVAL;
5915	}
5916
5917	if (READ_ONCE(idev->cnf.rtr_solicits) == `0`) {
5918	NL_SET_ERR_MSG(extack,
5919	"Router solicitation is disabled on device");
5920	return -EINVAL;
5921	}
5922
5923	write_lock_bh(&idev->lock);
5924
5925	BUILD_BUG_ON(sizeof(token->s6_addr) != `16`);
5926	memcpy(to: idev->token.s6_addr + `8`, from: token->s6_addr + `8`, len: `8`);
5927
5928	write_unlock_bh(&idev->lock);
5929
5930	clear_token = ipv6_addr_any(a: token);
5931	if (clear_token)
5932	goto update_lft;
5933
5934	if (!idev->dead && (idev->if_flags & IF_READY) &&
5935	!ipv6_get_lladdr(dev, addr: &ll_addr, IFA_F_TENTATIVE \|
5936	IFA_F_OPTIMISTIC)) {
5937	/ If we're not ready, then normal ifup will take care*
5938	* of this. Otherwise, we need to request our rs here.
5939	*/
5940	ndisc_send_rs(dev, saddr: &ll_addr, daddr: &in6addr_linklocal_allrouters);
5941	update_rs = true;
5942	}
5943
5944	update_lft:
5945	write_lock_bh(&idev->lock);
5946
5947	if (update_rs) {
5948	idev->if_flags \|= IF_RS_SENT;
5949	idev->rs_interval = rfc3315_s14_backoff_init(
5950	READ_ONCE(idev->cnf.rtr_solicit_interval));
5951	idev->rs_probes = `1`;
5952	addrconf_mod_rs_timer(idev, when: idev->rs_interval);
5953	}
5954
5955	/ Well, that's kinda nasty ... /
5956	list_for_each_entry(ifp, &idev->addr_list, if_list) {
5957	spin_lock(lock: &ifp->lock);
5958	if (ifp->tokenized) {
5959	ifp->valid_lft = `0`;
5960	ifp->prefered_lft = `0`;
5961	}
5962	spin_unlock(lock: &ifp->lock);
5963	}
5964
5965	write_unlock_bh(&idev->lock);
5966	inet6_ifinfo_notify(RTM_NEWLINK, idev);
5967	addrconf_verify_rtnl(net: dev_net(dev));
5968	return `0`;
5969	}
5970
5971	static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + `1`] = {
5972	[IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5973	[IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5974	[IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5975	.reject_message =
5976	"IFLA_INET6_RA_MTU can not be set" },
5977	};
5978
5979	static int check_addr_gen_mode(int mode)
5980	{
5981	if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5982	mode != IN6_ADDR_GEN_MODE_NONE &&
5983	mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5984	mode != IN6_ADDR_GEN_MODE_RANDOM)
5985	return -EINVAL;
5986	return `1`;
5987	}
5988
5989	static int check_stable_privacy(struct inet6_dev idev, struct* net *net,
5990	int mode)
5991	{
5992	if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5993	!idev->cnf.stable_secret.initialized &&
5994	!net->ipv6.devconf_dflt->stable_secret.initialized)
5995	return -EINVAL;
5996	return `1`;
5997	}
5998
5999	static int inet6_validate_link_af(const struct net_device *dev,
6000	const struct nlattr *nla,
6001	struct netlink_ext_ack *extack)
6002	{
6003	struct nlattr *tb[IFLA_INET6_MAX + `1`];
6004	struct inet6_dev *idev = NULL;
6005	int err;
6006
6007	if (dev) {
6008	idev = __in6_dev_get(dev);
6009	if (!idev)
6010	return -EAFNOSUPPORT;
6011	}
6012
6013	err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
6014	policy: inet6_af_policy, extack);
6015	if (err)
6016	return err;
6017
6018	if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6019	return -EINVAL;
6020
6021	if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6022	u8 mode = nla_get_u8(nla: tb[IFLA_INET6_ADDR_GEN_MODE]);
6023
6024	if (check_addr_gen_mode(mode) < `0`)
6025	return -EINVAL;
6026	if (dev && check_stable_privacy(idev, net: dev_net(dev), mode) < `0`)
6027	return -EINVAL;
6028	}
6029
6030	return `0`;
6031	}
6032
6033	static int inet6_set_link_af(struct net_device dev, const* struct nlattr *nla,
6034	struct netlink_ext_ack *extack)
6035	{
6036	struct inet6_dev *idev = __in6_dev_get(dev);
6037	struct nlattr *tb[IFLA_INET6_MAX + `1`];
6038	int err;
6039
6040	if (!idev)
6041	return -EAFNOSUPPORT;
6042
6043	if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < `0`)
6044	return -EINVAL;
6045
6046	if (tb[IFLA_INET6_TOKEN]) {
6047	err = inet6_set_iftoken(idev, token: nla_data(nla: tb[IFLA_INET6_TOKEN]),
6048	extack);
6049	if (err)
6050	return err;
6051	}
6052
6053	if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6054	u8 mode = nla_get_u8(nla: tb[IFLA_INET6_ADDR_GEN_MODE]);
6055
6056	WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6057	}
6058
6059	return `0`;
6060	}
6061
6062	static int inet6_fill_ifinfo(struct sk_buff skb, struct* inet6_dev *idev,
6063	u32 portid, u32 seq, int event, unsigned int flags)
6064	{
6065	struct net_device *dev = idev->dev;
6066	struct ifinfomsg *hdr;
6067	struct nlmsghdr *nlh;
6068	int ifindex, iflink;
6069	void *protoinfo;
6070
6071	nlh = nlmsg_put(skb, portid, seq, type: event, payload: sizeof(*hdr), flags);
6072	if (!nlh)
6073	return -EMSGSIZE;
6074
6075	hdr = nlmsg_data(nlh);
6076	hdr->ifi_family = AF_INET6;
6077	hdr->__ifi_pad = `0`;
6078	hdr->ifi_type = dev->type;
6079	ifindex = READ_ONCE(dev->ifindex);
6080	hdr->ifi_index = ifindex;
6081	hdr->ifi_flags = netif_get_flags(dev);
6082	hdr->ifi_change = `0`;
6083
6084	iflink = dev_get_iflink(dev);
6085	if (nla_put_string(skb, attrtype: IFLA_IFNAME, str: dev->name) \|\|
6086	(dev->addr_len &&
6087	nla_put(skb, attrtype: IFLA_ADDRESS, attrlen: dev->addr_len, data: dev->dev_addr)) \|\|
6088	nla_put_u32(skb, attrtype: IFLA_MTU, READ_ONCE(dev->mtu)) \|\|
6089	(ifindex != iflink &&
6090	nla_put_u32(skb, attrtype: IFLA_LINK, value: iflink)) \|\|
6091	nla_put_u8(skb, attrtype: IFLA_OPERSTATE,
6092	value: netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6093	goto nla_put_failure;
6094	protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6095	if (!protoinfo)
6096	goto nla_put_failure;
6097
6098	if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask: `0`) < `0`)
6099	goto nla_put_failure;
6100
6101	nla_nest_end(skb, start: protoinfo);
6102	nlmsg_end(skb, nlh);
6103	return `0`;
6104
6105	nla_put_failure:
6106	nlmsg_cancel(skb, nlh);
6107	return -EMSGSIZE;
6108	}
6109
6110	static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6111	struct netlink_ext_ack *extack)
6112	{
6113	struct ifinfomsg *ifm;
6114
6115	ifm = nlmsg_payload(nlh, len: sizeof(*ifm));
6116	if (!ifm) {
6117	NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6118	return -EINVAL;
6119	}
6120
6121	if (nlmsg_attrlen(nlh, hdrlen: sizeof(*ifm))) {
6122	NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6123	return -EINVAL;
6124	}
6125
6126	if (ifm->__ifi_pad \|\| ifm->ifi_type \|\| ifm->ifi_flags \|\|
6127	ifm->ifi_change \|\| ifm->ifi_index) {
6128	NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6129	return -EINVAL;
6130	}
6131
6132	return `0`;
6133	}
6134
6135	static int inet6_dump_ifinfo(struct sk_buff skb, struct* netlink_callback *cb)
6136	{
6137	struct net *net = sock_net(sk: skb->sk);
6138	struct {
6139	unsigned long ifindex;
6140	} ctx = (void* *)cb->ctx;
6141	struct net_device *dev;
6142	struct inet6_dev *idev;
6143	int err;
6144
6145	/ only requests using strict checking can pass data to*
6146	* influence the dump
6147	*/
6148	if (cb->strict_check) {
6149	err = inet6_valid_dump_ifinfo(nlh: cb->nlh, extack: cb->extack);
6150
6151	if (err < `0`)
6152	return err;
6153	}
6154
6155	err = `0`;
6156	rcu_read_lock();
6157	for_each_netdev_dump(net, dev, ctx->ifindex) {
6158	idev = __in6_dev_get(dev);
6159	if (!idev)
6160	continue;
6161	err = inet6_fill_ifinfo(skb, idev,
6162	NETLINK_CB(cb->skb).portid,
6163	seq: cb->nlh->nlmsg_seq,
6164	RTM_NEWLINK, NLM_F_MULTI);
6165	if (err < `0`)
6166	break;
6167	}
6168	rcu_read_unlock();
6169
6170	return err;
6171	}
6172
6173	void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6174	{
6175	struct sk_buff *skb;
6176	struct net *net = dev_net(dev: idev->dev);
6177	int err = -ENOBUFS;
6178
6179	skb = nlmsg_new(payload: inet6_if_nlmsg_size(), GFP_ATOMIC);
6180	if (!skb)
6181	goto errout;
6182
6183	err = inet6_fill_ifinfo(skb, idev, portid: `0`, seq: `0`, event, flags: `0`);
6184	if (err < `0`) {
6185	/ -EMSGSIZE implies BUG in inet6_if_nlmsg_size() /
6186	WARN_ON(err == -EMSGSIZE);
6187	kfree_skb(skb);
6188	goto errout;
6189	}
6190	rtnl_notify(skb, net, pid: `0`, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6191	return;
6192	errout:
6193	rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, error: err);
6194	}
6195
6196	static inline size_t inet6_prefix_nlmsg_size(void)
6197	{
6198	return NLMSG_ALIGN(sizeof(struct prefixmsg))
6199	+ nla_total_size(payload: sizeof(struct in6_addr))
6200	+ nla_total_size(payload: sizeof(struct prefix_cacheinfo));
6201	}
6202
6203	static int inet6_fill_prefix(struct sk_buff skb, struct* inet6_dev *idev,
6204	struct prefix_info *pinfo, u32 portid, u32 seq,
6205	int event, unsigned int flags)
6206	{
6207	struct prefixmsg *pmsg;
6208	struct nlmsghdr *nlh;
6209	struct prefix_cacheinfo ci;
6210
6211	nlh = nlmsg_put(skb, portid, seq, type: event, payload: sizeof(*pmsg), flags);
6212	if (!nlh)
6213	return -EMSGSIZE;
6214
6215	pmsg = nlmsg_data(nlh);
6216	pmsg->prefix_family = AF_INET6;
6217	pmsg->prefix_pad1 = `0`;
6218	pmsg->prefix_pad2 = `0`;
6219	pmsg->prefix_ifindex = idev->dev->ifindex;
6220	pmsg->prefix_len = pinfo->prefix_len;
6221	pmsg->prefix_type = pinfo->type;
6222	pmsg->prefix_pad3 = `0`;
6223	pmsg->prefix_flags = pinfo->flags;
6224
6225	if (nla_put(skb, attrtype: PREFIX_ADDRESS, attrlen: sizeof(pinfo->prefix), data: &pinfo->prefix))
6226	goto nla_put_failure;
6227	ci.preferred_time = ntohl(pinfo->prefered);
6228	ci.valid_time = ntohl(pinfo->valid);
6229	if (nla_put(skb, attrtype: PREFIX_CACHEINFO, attrlen: sizeof(ci), data: &ci))
6230	goto nla_put_failure;
6231	nlmsg_end(skb, nlh);
6232	return `0`;
6233
6234	nla_put_failure:
6235	nlmsg_cancel(skb, nlh);
6236	return -EMSGSIZE;
6237	}
6238
6239	static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6240	struct prefix_info *pinfo)
6241	{
6242	struct sk_buff *skb;
6243	struct net *net = dev_net(dev: idev->dev);
6244	int err = -ENOBUFS;
6245
6246	skb = nlmsg_new(payload: inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6247	if (!skb)
6248	goto errout;
6249
6250	err = inet6_fill_prefix(skb, idev, pinfo, portid: `0`, seq: `0`, event, flags: `0`);
6251	if (err < `0`) {
6252	/ -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() /
6253	WARN_ON(err == -EMSGSIZE);
6254	kfree_skb(skb);
6255	goto errout;
6256	}
6257	rtnl_notify(skb, net, pid: `0`, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6258	return;
6259	errout:
6260	rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, error: err);
6261	}
6262
6263	static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6264	{
6265	struct net *net = dev_net(dev: ifp->idev->dev);
6266
6267	if (event)
6268	ASSERT_RTNL();
6269
6270	inet6_ifa_notify(event: event ? : RTM_NEWADDR, ifa: ifp);
6271
6272	switch (event) {
6273	case RTM_NEWADDR:
6274	/*
6275	* If the address was optimistic we inserted the route at the
6276	* start of our DAD process, so we don't need to do it again.
6277	* If the device was taken down in the middle of the DAD
6278	* cycle there is a race where we could get here without a
6279	* host route, so nothing to insert. That will be fixed when
6280	* the device is brought up.
6281	*/
6282	if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6283	ip6_ins_rt(net, f6i: ifp->rt);
6284	} else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6285	pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6286	&ifp->addr, ifp->idev->dev->name);
6287	}
6288
6289	if (ifp->idev->cnf.forwarding)
6290	addrconf_join_anycast(ifp);
6291	if (!ipv6_addr_any(a: &ifp->peer_addr))
6292	addrconf_prefix_route(pfx: &ifp->peer_addr, plen: `128`,
6293	metric: ifp->rt_priority, dev: ifp->idev->dev,
6294	expires: `0`, flags: `0`, GFP_ATOMIC);
6295	break;
6296	case RTM_DELADDR:
6297	if (ifp->idev->cnf.forwarding)
6298	addrconf_leave_anycast(ifp);
6299	addrconf_leave_solict(idev: ifp->idev, addr: &ifp->addr);
6300	if (!ipv6_addr_any(a: &ifp->peer_addr)) {
6301	struct fib6_info *rt;
6302
6303	rt = addrconf_get_prefix_route(pfx: &ifp->peer_addr, plen: `128`,
6304	dev: ifp->idev->dev, flags: `0`, noflags: `0`,
6305	no_gw: false);
6306	if (rt)
6307	ip6_del_rt(net, f6i: rt, skip_notify: false);
6308	}
6309	if (ifp->rt) {
6310	ip6_del_rt(net, f6i: ifp->rt, skip_notify: false);
6311	ifp->rt = NULL;
6312	}
6313	rt_genid_bump_ipv6(net);
6314	break;
6315	}
6316	atomic_inc(v: &net->ipv6.dev_addr_genid);
6317	}
6318
6319	static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6320	{
6321	if (likely(ifp->idev->dead == `0`))
6322	__ipv6_ifa_notify(event, ifp);
6323	}
6324
6325	#ifdef CONFIG_SYSCTL
6326
6327	static int addrconf_sysctl_forward(const struct ctl_table ctl, int* write,
6328	void buffer, size_t lenp, loff_t *ppos)
6329	{
6330	int *valp = ctl->data;
6331	int val = *valp;
6332	loff_t pos = *ppos;
6333	struct ctl_table lctl;
6334	int ret;
6335
6336	/*
6337	* ctl->data points to idev->cnf.forwarding, we should
6338	* not modify it until we get the rtnl lock.
6339	*/
6340	lctl = *ctl;
6341	lctl.data = &val;
6342
6343	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6344
6345	if (write)
6346	ret = addrconf_fixup_forwarding(table: ctl, p: valp, newf: val);
6347	if (ret)
6348	*ppos = pos;
6349	return ret;
6350	}
6351
6352	static int addrconf_sysctl_mtu(const struct ctl_table ctl, int* write,
6353	void buffer, size_t lenp, loff_t *ppos)
6354	{
6355	struct inet6_dev *idev = ctl->extra1;
6356	int min_mtu = IPV6_MIN_MTU;
6357	struct ctl_table lctl;
6358
6359	lctl = *ctl;
6360	lctl.extra1 = &min_mtu;
6361	lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6362
6363	return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6364	}
6365
6366	static void dev_disable_change(struct inet6_dev *idev)
6367	{
6368	struct netdev_notifier_info info;
6369
6370	if (!idev \|\| !idev->dev)
6371	return;
6372
6373	netdev_notifier_info_init(info: &info, dev: idev->dev);
6374	if (idev->cnf.disable_ipv6)
6375	addrconf_notify(NULL, event: NETDEV_DOWN, ptr: &info);
6376	else
6377	addrconf_notify(NULL, event: NETDEV_UP, ptr: &info);
6378	}
6379
6380	static void addrconf_disable_change(struct net *net, __s32 newf)
6381	{
6382	struct net_device *dev;
6383	struct inet6_dev *idev;
6384
6385	for_each_netdev(net, dev) {
6386	idev = __in6_dev_get_rtnl_net(dev);
6387	if (idev) {
6388	int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6389
6390	WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6391	if (changed)
6392	dev_disable_change(idev);
6393	}
6394	}
6395	}
6396
6397	static int addrconf_disable_ipv6(const struct ctl_table table, int* p, int* newf)
6398	{
6399	struct net net = (struct* net *)table->extra2;
6400	int old;
6401
6402	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6403	WRITE_ONCE(*p, newf);
6404	return `0`;
6405	}
6406
6407	if (!rtnl_net_trylock(net))
6408	return restart_syscall();
6409
6410	old = *p;
6411	WRITE_ONCE(*p, newf);
6412
6413	if (p == &net->ipv6.devconf_all->disable_ipv6) {
6414	WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6415	addrconf_disable_change(net, newf);
6416	} else if ((!newf) ^ (!old)) {
6417	dev_disable_change(idev: (struct inet6_dev *)table->extra1);
6418	}
6419
6420	rtnl_net_unlock(net);
6421	return `0`;
6422	}
6423
6424	static int addrconf_sysctl_disable(const struct ctl_table ctl, int* write,
6425	void buffer, size_t lenp, loff_t *ppos)
6426	{
6427	int *valp = ctl->data;
6428	int val = *valp;
6429	loff_t pos = *ppos;
6430	struct ctl_table lctl;
6431	int ret;
6432
6433	/*
6434	* ctl->data points to idev->cnf.disable_ipv6, we should
6435	* not modify it until we get the rtnl lock.
6436	*/
6437	lctl = *ctl;
6438	lctl.data = &val;
6439
6440	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6441
6442	if (write)
6443	ret = addrconf_disable_ipv6(table: ctl, p: valp, newf: val);
6444	if (ret)
6445	*ppos = pos;
6446	return ret;
6447	}
6448
6449	static int addrconf_sysctl_proxy_ndp(const struct ctl_table ctl, int* write,
6450	void buffer, size_t lenp, loff_t *ppos)
6451	{
6452	int *valp = ctl->data;
6453	int ret;
6454	int old, new;
6455
6456	old = *valp;
6457	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6458	new = *valp;
6459
6460	if (write && old != new) {
6461	struct net *net = ctl->extra2;
6462
6463	if (!rtnl_net_trylock(net))
6464	return restart_syscall();
6465
6466	if (valp == &net->ipv6.devconf_dflt->proxy_ndp) {
6467	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6468	type: NETCONFA_PROXY_NEIGH,
6469	NETCONFA_IFINDEX_DEFAULT,
6470	devconf: net->ipv6.devconf_dflt);
6471	} else if (valp == &net->ipv6.devconf_all->proxy_ndp) {
6472	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6473	type: NETCONFA_PROXY_NEIGH,
6474	NETCONFA_IFINDEX_ALL,
6475	devconf: net->ipv6.devconf_all);
6476	} else {
6477	struct inet6_dev *idev = ctl->extra1;
6478
6479	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6480	type: NETCONFA_PROXY_NEIGH,
6481	ifindex: idev->dev->ifindex,
6482	devconf: &idev->cnf);
6483	}
6484	rtnl_net_unlock(net);
6485	}
6486
6487	return ret;
6488	}
6489
6490	static int addrconf_sysctl_addr_gen_mode(const struct ctl_table ctl, int* write,
6491	void buffer, size_t lenp,
6492	loff_t *ppos)
6493	{
6494	int ret = `0`;
6495	u32 new_val;
6496	struct inet6_dev idev = (struct* inet6_dev *)ctl->extra1;
6497	struct net net = (struct* net *)ctl->extra2;
6498	struct ctl_table tmp = {
6499	.data = &new_val,
6500	.maxlen = sizeof(new_val),
6501	.mode = ctl->mode,
6502	};
6503
6504	if (!rtnl_net_trylock(net))
6505	return restart_syscall();
6506
6507	new_val = ((u32 )ctl->data);
6508
6509	ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6510	if (ret != `0`)
6511	goto out;
6512
6513	if (write) {
6514	if (check_addr_gen_mode(mode: new_val) < `0`) {
6515	ret = -EINVAL;
6516	goto out;
6517	}
6518
6519	if (idev) {
6520	if (check_stable_privacy(idev, net, mode: new_val) < `0`) {
6521	ret = -EINVAL;
6522	goto out;
6523	}
6524
6525	if (idev->cnf.addr_gen_mode != new_val) {
6526	WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6527	netdev_lock_ops(dev: idev->dev);
6528	addrconf_init_auto_addrs(dev: idev->dev);
6529	netdev_unlock_ops(dev: idev->dev);
6530	}
6531	} else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6532	struct net_device *dev;
6533
6534	WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6535	for_each_netdev(net, dev) {
6536	idev = __in6_dev_get_rtnl_net(dev);
6537	if (idev &&
6538	idev->cnf.addr_gen_mode != new_val) {
6539	WRITE_ONCE(idev->cnf.addr_gen_mode,
6540	new_val);
6541	netdev_lock_ops(dev: idev->dev);
6542	addrconf_init_auto_addrs(dev: idev->dev);
6543	netdev_unlock_ops(dev: idev->dev);
6544	}
6545	}
6546	}
6547
6548	WRITE_ONCE(((u32 )ctl->data), new_val);
6549	}
6550
6551	out:
6552	rtnl_net_unlock(net);
6553
6554	return ret;
6555	}
6556
6557	static int addrconf_sysctl_stable_secret(const struct ctl_table ctl, int* write,
6558	void buffer, size_t lenp,
6559	loff_t *ppos)
6560	{
6561	int err;
6562	struct in6_addr addr;
6563	char str[IPV6_MAX_STRLEN];
6564	struct ctl_table lctl = *ctl;
6565	struct net *net = ctl->extra2;
6566	struct ipv6_stable_secret *secret = ctl->data;
6567
6568	if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6569	return -EIO;
6570
6571	lctl.maxlen = IPV6_MAX_STRLEN;
6572	lctl.data = str;
6573
6574	if (!rtnl_net_trylock(net))
6575	return restart_syscall();
6576
6577	if (!write && !secret->initialized) {
6578	err = -EIO;
6579	goto out;
6580	}
6581
6582	err = snprintf(buf: str, size: sizeof(str), fmt: "%pI6", &secret->secret);
6583	if (err >= sizeof(str)) {
6584	err = -EIO;
6585	goto out;
6586	}
6587
6588	err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6589	if (err \|\| !write)
6590	goto out;
6591
6592	if (in6_pton(src: str, srclen: -`1`, dst: addr.in6_u.u6_addr8, delim: -`1`, NULL) != `1`) {
6593	err = -EIO;
6594	goto out;
6595	}
6596
6597	secret->initialized = true;
6598	secret->secret = addr;
6599
6600	if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6601	struct net_device *dev;
6602
6603	for_each_netdev(net, dev) {
6604	struct inet6_dev *idev = __in6_dev_get_rtnl_net(dev);
6605
6606	if (idev) {
6607	WRITE_ONCE(idev->cnf.addr_gen_mode,
6608	IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6609	}
6610	}
6611	} else {
6612	struct inet6_dev *idev = ctl->extra1;
6613
6614	WRITE_ONCE(idev->cnf.addr_gen_mode,
6615	IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6616	}
6617
6618	out:
6619	rtnl_net_unlock(net);
6620
6621	return err;
6622	}
6623
6624	static
6625	int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
6626	int write, void *buffer,
6627	size_t *lenp,
6628	loff_t *ppos)
6629	{
6630	int *valp = ctl->data;
6631	int val = *valp;
6632	loff_t pos = *ppos;
6633	struct ctl_table lctl;
6634	int ret;
6635
6636	/ ctl->data points to idev->cnf.ignore_routes_when_linkdown*
6637	* we should not modify it until we get the rtnl lock.
6638	*/
6639	lctl = *ctl;
6640	lctl.data = &val;
6641
6642	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6643
6644	if (write)
6645	ret = addrconf_fixup_linkdown(table: ctl, p: valp, newf: val);
6646	if (ret)
6647	*ppos = pos;
6648	return ret;
6649	}
6650
6651	static
6652	void addrconf_set_nopolicy(struct rt6_info rt, int* action)
6653	{
6654	if (rt) {
6655	if (action)
6656	rt->dst.flags \|= DST_NOPOLICY;
6657	else
6658	rt->dst.flags &= ~DST_NOPOLICY;
6659	}
6660	}
6661
6662	static
6663	void addrconf_disable_policy_idev(struct inet6_dev idev, int* val)
6664	{
6665	struct inet6_ifaddr *ifa;
6666
6667	read_lock_bh(&idev->lock);
6668	list_for_each_entry(ifa, &idev->addr_list, if_list) {
6669	spin_lock(lock: &ifa->lock);
6670	if (ifa->rt) {
6671	/ host routes only use builtin fib6_nh /
6672	struct fib6_nh *nh = ifa->rt->fib6_nh;
6673	int cpu;
6674
6675	rcu_read_lock();
6676	ifa->rt->dst_nopolicy = val ? true : false;
6677	if (nh->rt6i_pcpu) {
6678	for_each_possible_cpu(cpu) {
6679	struct rt6_info **rtp;
6680
6681	rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6682	addrconf_set_nopolicy(rt: *rtp, action: val);
6683	}
6684	}
6685	rcu_read_unlock();
6686	}
6687	spin_unlock(lock: &ifa->lock);
6688	}
6689	read_unlock_bh(&idev->lock);
6690	}
6691
6692	static
6693	int addrconf_disable_policy(const struct ctl_table ctl, int* valp, int* val)
6694	{
6695	struct net net = (struct* net *)ctl->extra2;
6696	struct inet6_dev *idev;
6697
6698	if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6699	WRITE_ONCE(*valp, val);
6700	return `0`;
6701	}
6702
6703	if (!rtnl_net_trylock(net))
6704	return restart_syscall();
6705
6706	WRITE_ONCE(*valp, val);
6707
6708	if (valp == &net->ipv6.devconf_all->disable_policy) {
6709	struct net_device *dev;
6710
6711	for_each_netdev(net, dev) {
6712	idev = __in6_dev_get_rtnl_net(dev);
6713	if (idev)
6714	addrconf_disable_policy_idev(idev, val);
6715	}
6716	} else {
6717	idev = (struct inet6_dev *)ctl->extra1;
6718	addrconf_disable_policy_idev(idev, val);
6719	}
6720
6721	rtnl_net_unlock(net);
6722	return `0`;
6723	}
6724
6725	static int addrconf_sysctl_disable_policy(const struct ctl_table ctl, int* write,
6726	void buffer, size_t lenp, loff_t *ppos)
6727	{
6728	int *valp = ctl->data;
6729	int val = *valp;
6730	loff_t pos = *ppos;
6731	struct ctl_table lctl;
6732	int ret;
6733
6734	lctl = *ctl;
6735	lctl.data = &val;
6736	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6737
6738	if (write && (*valp != val))
6739	ret = addrconf_disable_policy(ctl, valp, val);
6740
6741	if (ret)
6742	*ppos = pos;
6743
6744	return ret;
6745	}
6746
6747	static void addrconf_force_forward_change(struct net *net, __s32 newf)
6748	{
6749	struct net_device *dev;
6750	struct inet6_dev *idev;
6751
6752	for_each_netdev(net, dev) {
6753	idev = __in6_dev_get_rtnl_net(dev);
6754	if (idev) {
6755	int changed = (!idev->cnf.force_forwarding) ^ (!newf);
6756
6757	WRITE_ONCE(idev->cnf.force_forwarding, newf);
6758	if (changed)
6759	inet6_netconf_notify_devconf(net: dev_net(dev), RTM_NEWNETCONF,
6760	type: NETCONFA_FORCE_FORWARDING,
6761	ifindex: dev->ifindex, devconf: &idev->cnf);
6762	}
6763	}
6764	}
6765
6766	static int addrconf_sysctl_force_forwarding(const struct ctl_table ctl, int* write,
6767	void buffer, size_t lenp, loff_t *ppos)
6768	{
6769	struct inet6_dev *idev = ctl->extra1;
6770	struct ctl_table tmp_ctl = *ctl;
6771	struct net *net = ctl->extra2;
6772	int *valp = ctl->data;
6773	int new_val = *valp;
6774	int old_val = *valp;
6775	loff_t pos = *ppos;
6776	int ret;
6777
6778	tmp_ctl.extra1 = SYSCTL_ZERO;
6779	tmp_ctl.extra2 = SYSCTL_ONE;
6780	tmp_ctl.data = &new_val;
6781
6782	ret = proc_douintvec_minmax(table: &tmp_ctl, write, buffer, lenp, ppos);
6783
6784	if (write && old_val != new_val) {
6785	if (!rtnl_net_trylock(net))
6786	return restart_syscall();
6787
6788	WRITE_ONCE(*valp, new_val);
6789
6790	if (valp == &net->ipv6.devconf_dflt->force_forwarding) {
6791	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6792	type: NETCONFA_FORCE_FORWARDING,
6793	NETCONFA_IFINDEX_DEFAULT,
6794	devconf: net->ipv6.devconf_dflt);
6795	} else if (valp == &net->ipv6.devconf_all->force_forwarding) {
6796	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6797	type: NETCONFA_FORCE_FORWARDING,
6798	NETCONFA_IFINDEX_ALL,
6799	devconf: net->ipv6.devconf_all);
6800
6801	addrconf_force_forward_change(net, newf: new_val);
6802	} else {
6803	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6804	type: NETCONFA_FORCE_FORWARDING,
6805	ifindex: idev->dev->ifindex,
6806	devconf: &idev->cnf);
6807	}
6808	rtnl_net_unlock(net);
6809	}
6810
6811	if (ret)
6812	*ppos = pos;
6813	return ret;
6814	}
6815
6816	static int minus_one = -`1`;
6817	static const int two_five_five = `255`;
6818	static u32 ioam6_if_id_max = U16_MAX;
6819
6820	static const struct ctl_table addrconf_sysctl[] = {
6821	{
6822	.procname = "forwarding",
6823	.data = &ipv6_devconf.forwarding,
6824	.maxlen = sizeof(int),
6825	.mode = `0644`,
6826	.proc_handler = addrconf_sysctl_forward,
6827	},
6828	{
6829	.procname = "hop_limit",
6830	.data = &ipv6_devconf.hop_limit,
6831	.maxlen = sizeof(int),
6832	.mode = `0644`,
6833	.proc_handler = proc_dointvec_minmax,
6834	.extra1 = (void *)SYSCTL_ONE,
6835	.extra2 = (void *)&two_five_five,
6836	},
6837	{
6838	.procname = "mtu",
6839	.data = &ipv6_devconf.mtu6,
6840	.maxlen = sizeof(int),
6841	.mode = `0644`,
6842	.proc_handler = addrconf_sysctl_mtu,
6843	},
6844	{
6845	.procname = "accept_ra",
6846	.data = &ipv6_devconf.accept_ra,
6847	.maxlen = sizeof(int),
6848	.mode = `0644`,
6849	.proc_handler = proc_dointvec,
6850	},
6851	{
6852	.procname = "accept_redirects",
6853	.data = &ipv6_devconf.accept_redirects,
6854	.maxlen = sizeof(int),
6855	.mode = `0644`,
6856	.proc_handler = proc_dointvec,
6857	},
6858	{
6859	.procname = "autoconf",
6860	.data = &ipv6_devconf.autoconf,
6861	.maxlen = sizeof(int),
6862	.mode = `0644`,
6863	.proc_handler = proc_dointvec,
6864	},
6865	{
6866	.procname = "dad_transmits",
6867	.data = &ipv6_devconf.dad_transmits,
6868	.maxlen = sizeof(int),
6869	.mode = `0644`,
6870	.proc_handler = proc_dointvec,
6871	},
6872	{
6873	.procname = "router_solicitations",
6874	.data = &ipv6_devconf.rtr_solicits,
6875	.maxlen = sizeof(int),
6876	.mode = `0644`,
6877	.proc_handler = proc_dointvec_minmax,
6878	.extra1 = &minus_one,
6879	},
6880	{
6881	.procname = "router_solicitation_interval",
6882	.data = &ipv6_devconf.rtr_solicit_interval,
6883	.maxlen = sizeof(int),
6884	.mode = `0644`,
6885	.proc_handler = proc_dointvec_jiffies,
6886	},
6887	{
6888	.procname = "router_solicitation_max_interval",
6889	.data = &ipv6_devconf.rtr_solicit_max_interval,
6890	.maxlen = sizeof(int),
6891	.mode = `0644`,
6892	.proc_handler = proc_dointvec_jiffies,
6893	},
6894	{
6895	.procname = "router_solicitation_delay",
6896	.data = &ipv6_devconf.rtr_solicit_delay,
6897	.maxlen = sizeof(int),
6898	.mode = `0644`,
6899	.proc_handler = proc_dointvec_jiffies,
6900	},
6901	{
6902	.procname = "force_mld_version",
6903	.data = &ipv6_devconf.force_mld_version,
6904	.maxlen = sizeof(int),
6905	.mode = `0644`,
6906	.proc_handler = proc_dointvec,
6907	},
6908	{
6909	.procname = "mldv1_unsolicited_report_interval",
6910	.data =
6911	&ipv6_devconf.mldv1_unsolicited_report_interval,
6912	.maxlen = sizeof(int),
6913	.mode = `0644`,
6914	.proc_handler = proc_dointvec_ms_jiffies,
6915	},
6916	{
6917	.procname = "mldv2_unsolicited_report_interval",
6918	.data =
6919	&ipv6_devconf.mldv2_unsolicited_report_interval,
6920	.maxlen = sizeof(int),
6921	.mode = `0644`,
6922	.proc_handler = proc_dointvec_ms_jiffies,
6923	},
6924	{
6925	.procname = "use_tempaddr",
6926	.data = &ipv6_devconf.use_tempaddr,
6927	.maxlen = sizeof(int),
6928	.mode = `0644`,
6929	.proc_handler = proc_dointvec,
6930	},
6931	{
6932	.procname = "temp_valid_lft",
6933	.data = &ipv6_devconf.temp_valid_lft,
6934	.maxlen = sizeof(int),
6935	.mode = `0644`,
6936	.proc_handler = proc_dointvec,
6937	},
6938	{
6939	.procname = "temp_prefered_lft",
6940	.data = &ipv6_devconf.temp_prefered_lft,
6941	.maxlen = sizeof(int),
6942	.mode = `0644`,
6943	.proc_handler = proc_dointvec,
6944	},
6945	{
6946	.procname = "regen_min_advance",
6947	.data = &ipv6_devconf.regen_min_advance,
6948	.maxlen = sizeof(int),
6949	.mode = `0644`,
6950	.proc_handler = proc_dointvec,
6951	},
6952	{
6953	.procname = "regen_max_retry",
6954	.data = &ipv6_devconf.regen_max_retry,
6955	.maxlen = sizeof(int),
6956	.mode = `0644`,
6957	.proc_handler = proc_dointvec,
6958	},
6959	{
6960	.procname = "max_desync_factor",
6961	.data = &ipv6_devconf.max_desync_factor,
6962	.maxlen = sizeof(int),
6963	.mode = `0644`,
6964	.proc_handler = proc_dointvec,
6965	},
6966	{
6967	.procname = "max_addresses",
6968	.data = &ipv6_devconf.max_addresses,
6969	.maxlen = sizeof(int),
6970	.mode = `0644`,
6971	.proc_handler = proc_dointvec,
6972	},
6973	{
6974	.procname = "accept_ra_defrtr",
6975	.data = &ipv6_devconf.accept_ra_defrtr,
6976	.maxlen = sizeof(int),
6977	.mode = `0644`,
6978	.proc_handler = proc_dointvec,
6979	},
6980	{
6981	.procname = "ra_defrtr_metric",
6982	.data = &ipv6_devconf.ra_defrtr_metric,
6983	.maxlen = sizeof(u32),
6984	.mode = `0644`,
6985	.proc_handler = proc_douintvec_minmax,
6986	.extra1 = (void *)SYSCTL_ONE,
6987	},
6988	{
6989	.procname = "accept_ra_min_hop_limit",
6990	.data = &ipv6_devconf.accept_ra_min_hop_limit,
6991	.maxlen = sizeof(int),
6992	.mode = `0644`,
6993	.proc_handler = proc_dointvec,
6994	},
6995	{
6996	.procname = "accept_ra_min_lft",
6997	.data = &ipv6_devconf.accept_ra_min_lft,
6998	.maxlen = sizeof(int),
6999	.mode = `0644`,
7000	.proc_handler = proc_dointvec,
7001	},
7002	{
7003	.procname = "accept_ra_pinfo",
7004	.data = &ipv6_devconf.accept_ra_pinfo,
7005	.maxlen = sizeof(int),
7006	.mode = `0644`,
7007	.proc_handler = proc_dointvec,
7008	},
7009	{
7010	.procname = "ra_honor_pio_life",
7011	.data = &ipv6_devconf.ra_honor_pio_life,
7012	.maxlen = sizeof(u8),
7013	.mode = `0644`,
7014	.proc_handler = proc_dou8vec_minmax,
7015	.extra1 = SYSCTL_ZERO,
7016	.extra2 = SYSCTL_ONE,
7017	},
7018	{
7019	.procname = "ra_honor_pio_pflag",
7020	.data = &ipv6_devconf.ra_honor_pio_pflag,
7021	.maxlen = sizeof(u8),
7022	.mode = `0644`,
7023	.proc_handler = proc_dou8vec_minmax,
7024	.extra1 = SYSCTL_ZERO,
7025	.extra2 = SYSCTL_ONE,
7026	},
7027	#ifdef CONFIG_IPV6_ROUTER_PREF
7028	{
7029	.procname = "accept_ra_rtr_pref",
7030	.data = &ipv6_devconf.accept_ra_rtr_pref,
7031	.maxlen = sizeof(int),
7032	.mode = `0644`,
7033	.proc_handler = proc_dointvec,
7034	},
7035	{
7036	.procname = "router_probe_interval",
7037	.data = &ipv6_devconf.rtr_probe_interval,
7038	.maxlen = sizeof(int),
7039	.mode = `0644`,
7040	.proc_handler = proc_dointvec_jiffies,
7041	},
7042	#ifdef CONFIG_IPV6_ROUTE_INFO
7043	{
7044	.procname = "accept_ra_rt_info_min_plen",
7045	.data = &ipv6_devconf.accept_ra_rt_info_min_plen,
7046	.maxlen = sizeof(int),
7047	.mode = `0644`,
7048	.proc_handler = proc_dointvec,
7049	},
7050	{
7051	.procname = "accept_ra_rt_info_max_plen",
7052	.data = &ipv6_devconf.accept_ra_rt_info_max_plen,
7053	.maxlen = sizeof(int),
7054	.mode = `0644`,
7055	.proc_handler = proc_dointvec,
7056	},
7057	#endif
7058	#endif
7059	{
7060	.procname = "proxy_ndp",
7061	.data = &ipv6_devconf.proxy_ndp,
7062	.maxlen = sizeof(int),
7063	.mode = `0644`,
7064	.proc_handler = addrconf_sysctl_proxy_ndp,
7065	},
7066	{
7067	.procname = "accept_source_route",
7068	.data = &ipv6_devconf.accept_source_route,
7069	.maxlen = sizeof(int),
7070	.mode = `0644`,
7071	.proc_handler = proc_dointvec,
7072	},
7073	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
7074	{
7075	.procname = "optimistic_dad",
7076	.data = &ipv6_devconf.optimistic_dad,
7077	.maxlen = sizeof(int),
7078	.mode = `0644`,
7079	.proc_handler = proc_dointvec,
7080	},
7081	{
7082	.procname = "use_optimistic",
7083	.data = &ipv6_devconf.use_optimistic,
7084	.maxlen = sizeof(int),
7085	.mode = `0644`,
7086	.proc_handler = proc_dointvec,
7087	},
7088	#endif
7089	#ifdef CONFIG_IPV6_MROUTE
7090	{
7091	.procname = "mc_forwarding",
7092	.data = &ipv6_devconf.mc_forwarding,
7093	.maxlen = sizeof(int),
7094	.mode = `0444`,
7095	.proc_handler = proc_dointvec,
7096	},
7097	#endif
7098	{
7099	.procname = "disable_ipv6",
7100	.data = &ipv6_devconf.disable_ipv6,
7101	.maxlen = sizeof(int),
7102	.mode = `0644`,
7103	.proc_handler = addrconf_sysctl_disable,
7104	},
7105	{
7106	.procname = "accept_dad",
7107	.data = &ipv6_devconf.accept_dad,
7108	.maxlen = sizeof(int),
7109	.mode = `0644`,
7110	.proc_handler = proc_dointvec,
7111	},
7112	{
7113	.procname = "force_tllao",
7114	.data = &ipv6_devconf.force_tllao,
7115	.maxlen = sizeof(int),
7116	.mode = `0644`,
7117	.proc_handler = proc_dointvec
7118	},
7119	{
7120	.procname = "ndisc_notify",
7121	.data = &ipv6_devconf.ndisc_notify,
7122	.maxlen = sizeof(int),
7123	.mode = `0644`,
7124	.proc_handler = proc_dointvec
7125	},
7126	{
7127	.procname = "suppress_frag_ndisc",
7128	.data = &ipv6_devconf.suppress_frag_ndisc,
7129	.maxlen = sizeof(int),
7130	.mode = `0644`,
7131	.proc_handler = proc_dointvec
7132	},
7133	{
7134	.procname = "accept_ra_from_local",
7135	.data = &ipv6_devconf.accept_ra_from_local,
7136	.maxlen = sizeof(int),
7137	.mode = `0644`,
7138	.proc_handler = proc_dointvec,
7139	},
7140	{
7141	.procname = "accept_ra_mtu",
7142	.data = &ipv6_devconf.accept_ra_mtu,
7143	.maxlen = sizeof(int),
7144	.mode = `0644`,
7145	.proc_handler = proc_dointvec,
7146	},
7147	{
7148	.procname = "stable_secret",
7149	.data = &ipv6_devconf.stable_secret,
7150	.maxlen = IPV6_MAX_STRLEN,
7151	.mode = `0600`,
7152	.proc_handler = addrconf_sysctl_stable_secret,
7153	},
7154	{
7155	.procname = "use_oif_addrs_only",
7156	.data = &ipv6_devconf.use_oif_addrs_only,
7157	.maxlen = sizeof(int),
7158	.mode = `0644`,
7159	.proc_handler = proc_dointvec,
7160	},
7161	{
7162	.procname = "ignore_routes_with_linkdown",
7163	.data = &ipv6_devconf.ignore_routes_with_linkdown,
7164	.maxlen = sizeof(int),
7165	.mode = `0644`,
7166	.proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7167	},
7168	{
7169	.procname = "drop_unicast_in_l2_multicast",
7170	.data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7171	.maxlen = sizeof(int),
7172	.mode = `0644`,
7173	.proc_handler = proc_dointvec,
7174	},
7175	{
7176	.procname = "drop_unsolicited_na",
7177	.data = &ipv6_devconf.drop_unsolicited_na,
7178	.maxlen = sizeof(int),
7179	.mode = `0644`,
7180	.proc_handler = proc_dointvec,
7181	},
7182	{
7183	.procname = "keep_addr_on_down",
7184	.data = &ipv6_devconf.keep_addr_on_down,
7185	.maxlen = sizeof(int),
7186	.mode = `0644`,
7187	.proc_handler = proc_dointvec,
7188
7189	},
7190	{
7191	.procname = "seg6_enabled",
7192	.data = &ipv6_devconf.seg6_enabled,
7193	.maxlen = sizeof(int),
7194	.mode = `0644`,
7195	.proc_handler = proc_dointvec,
7196	},
7197	#ifdef CONFIG_IPV6_SEG6_HMAC
7198	{
7199	.procname = "seg6_require_hmac",
7200	.data = &ipv6_devconf.seg6_require_hmac,
7201	.maxlen = sizeof(int),
7202	.mode = `0644`,
7203	.proc_handler = proc_dointvec,
7204	},
7205	#endif
7206	{
7207	.procname = "enhanced_dad",
7208	.data = &ipv6_devconf.enhanced_dad,
7209	.maxlen = sizeof(int),
7210	.mode = `0644`,
7211	.proc_handler = proc_dointvec,
7212	},
7213	{
7214	.procname = "addr_gen_mode",
7215	.data = &ipv6_devconf.addr_gen_mode,
7216	.maxlen = sizeof(int),
7217	.mode = `0644`,
7218	.proc_handler = addrconf_sysctl_addr_gen_mode,
7219	},
7220	{
7221	.procname = "disable_policy",
7222	.data = &ipv6_devconf.disable_policy,
7223	.maxlen = sizeof(int),
7224	.mode = `0644`,
7225	.proc_handler = addrconf_sysctl_disable_policy,
7226	},
7227	{
7228	.procname = "ndisc_tclass",
7229	.data = &ipv6_devconf.ndisc_tclass,
7230	.maxlen = sizeof(int),
7231	.mode = `0644`,
7232	.proc_handler = proc_dointvec_minmax,
7233	.extra1 = (void *)SYSCTL_ZERO,
7234	.extra2 = (void *)&two_five_five,
7235	},
7236	{
7237	.procname = "rpl_seg_enabled",
7238	.data = &ipv6_devconf.rpl_seg_enabled,
7239	.maxlen = sizeof(int),
7240	.mode = `0644`,
7241	.proc_handler = proc_dointvec_minmax,
7242	.extra1 = SYSCTL_ZERO,
7243	.extra2 = SYSCTL_ONE,
7244	},
7245	{
7246	.procname = "ioam6_enabled",
7247	.data = &ipv6_devconf.ioam6_enabled,
7248	.maxlen = sizeof(u8),
7249	.mode = `0644`,
7250	.proc_handler = proc_dou8vec_minmax,
7251	.extra1 = (void *)SYSCTL_ZERO,
7252	.extra2 = (void *)SYSCTL_ONE,
7253	},
7254	{
7255	.procname = "ioam6_id",
7256	.data = &ipv6_devconf.ioam6_id,
7257	.maxlen = sizeof(u32),
7258	.mode = `0644`,
7259	.proc_handler = proc_douintvec_minmax,
7260	.extra1 = (void *)SYSCTL_ZERO,
7261	.extra2 = (void *)&ioam6_if_id_max,
7262	},
7263	{
7264	.procname = "ioam6_id_wide",
7265	.data = &ipv6_devconf.ioam6_id_wide,
7266	.maxlen = sizeof(u32),
7267	.mode = `0644`,
7268	.proc_handler = proc_douintvec,
7269	},
7270	{
7271	.procname = "ndisc_evict_nocarrier",
7272	.data = &ipv6_devconf.ndisc_evict_nocarrier,
7273	.maxlen = sizeof(u8),
7274	.mode = `0644`,
7275	.proc_handler = proc_dou8vec_minmax,
7276	.extra1 = (void *)SYSCTL_ZERO,
7277	.extra2 = (void *)SYSCTL_ONE,
7278	},
7279	{
7280	.procname = "accept_untracked_na",
7281	.data = &ipv6_devconf.accept_untracked_na,
7282	.maxlen = sizeof(int),
7283	.mode = `0644`,
7284	.proc_handler = proc_dointvec_minmax,
7285	.extra1 = SYSCTL_ZERO,
7286	.extra2 = SYSCTL_TWO,
7287	},
7288	{
7289	.procname = "force_forwarding",
7290	.data = &ipv6_devconf.force_forwarding,
7291	.maxlen = sizeof(int),
7292	.mode = `0644`,
7293	.proc_handler = addrconf_sysctl_force_forwarding,
7294	},
7295	};
7296
7297	static int __addrconf_sysctl_register(struct net net, char* *dev_name,
7298	struct inet6_dev idev, struct* ipv6_devconf *p)
7299	{
7300	size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7301	int i, ifindex;
7302	struct ctl_table *table;
7303	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7304
7305	table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7306	if (!table)
7307	goto out;
7308
7309	for (i = `0`; i < table_size; i++) {
7310	table[i].data += (char )p - (char* *)&ipv6_devconf;
7311	/ If one of these is already set, then it is not safe to*
7312	* overwrite either of them: this makes proc_dointvec_minmax
7313	* usable.
7314	*/
7315	if (!table[i].extra1 && !table[i].extra2) {
7316	table[i].extra1 = idev; / embedded; no ref /
7317	table[i].extra2 = net;
7318	}
7319	}
7320
7321	snprintf(buf: path, size: sizeof(path), fmt: "net/ipv6/conf/%s", dev_name);
7322
7323	p->sysctl_header = register_net_sysctl_sz(net, path, table,
7324	table_size);
7325	if (!p->sysctl_header)
7326	goto free;
7327
7328	if (!strcmp(dev_name, "all"))
7329	ifindex = NETCONFA_IFINDEX_ALL;
7330	else if (!strcmp(dev_name, "default"))
7331	ifindex = NETCONFA_IFINDEX_DEFAULT;
7332	else
7333	ifindex = idev->dev->ifindex;
7334	inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7335	ifindex, devconf: p);
7336	return `0`;
7337
7338	free:
7339	kfree(objp: table);
7340	out:
7341	return -ENOBUFS;
7342	}
7343
7344	static void __addrconf_sysctl_unregister(struct net *net,
7345	struct ipv6_devconf p, int* ifindex)
7346	{
7347	const struct ctl_table *table;
7348
7349	if (!p->sysctl_header)
7350	return;
7351
7352	table = p->sysctl_header->ctl_table_arg;
7353	unregister_net_sysctl_table(header: p->sysctl_header);
7354	p->sysctl_header = NULL;
7355	kfree(objp: table);
7356
7357	inet6_netconf_notify_devconf(net, RTM_DELNETCONF, type: `0`, ifindex, NULL);
7358	}
7359
7360	static int addrconf_sysctl_register(struct inet6_dev *idev)
7361	{
7362	int err;
7363
7364	if (!sysctl_dev_name_is_allowed(name: idev->dev->name))
7365	return -EINVAL;
7366
7367	err = neigh_sysctl_register(dev: idev->dev, p: idev->nd_parms,
7368	proc_handler: &ndisc_ifinfo_sysctl_change);
7369	if (err)
7370	return err;
7371	err = __addrconf_sysctl_register(net: dev_net(dev: idev->dev), dev_name: idev->dev->name,
7372	idev, p: &idev->cnf);
7373	if (err)
7374	neigh_sysctl_unregister(p: idev->nd_parms);
7375
7376	return err;
7377	}
7378
7379	static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7380	{
7381	__addrconf_sysctl_unregister(net: dev_net(dev: idev->dev), p: &idev->cnf,
7382	ifindex: idev->dev->ifindex);
7383	neigh_sysctl_unregister(p: idev->nd_parms);
7384	}
7385
7386
7387	#endif
7388
7389	static int __net_init addrconf_init_net(struct net *net)
7390	{
7391	int err = -ENOMEM;
7392	struct ipv6_devconf all, dflt;
7393
7394	spin_lock_init(&net->ipv6.addrconf_hash_lock);
7395	INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7396	net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7397	sizeof(struct hlist_head),
7398	GFP_KERNEL);
7399	if (!net->ipv6.inet6_addr_lst)
7400	goto err_alloc_addr;
7401
7402	all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7403	if (!all)
7404	goto err_alloc_all;
7405
7406	dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7407	if (!dflt)
7408	goto err_alloc_dflt;
7409
7410	if (!net_eq(net1: net, net2: &init_net)) {
7411	switch (net_inherit_devconf()) {
7412	case `1`: / copy from init_net /
7413	memcpy(to: all, from: init_net.ipv6.devconf_all,
7414	len: sizeof(ipv6_devconf));
7415	memcpy(to: dflt, from: init_net.ipv6.devconf_dflt,
7416	len: sizeof(ipv6_devconf_dflt));
7417	break;
7418	case `3`: / copy from the current netns /
7419	memcpy(to: all, current->nsproxy->net_ns->ipv6.devconf_all,
7420	len: sizeof(ipv6_devconf));
7421	memcpy(to: dflt,
7422	current->nsproxy->net_ns->ipv6.devconf_dflt,
7423	len: sizeof(ipv6_devconf_dflt));
7424	break;
7425	case `0`:
7426	case `2`:
7427	/ use compiled values /
7428	break;
7429	}
7430	}
7431
7432	/ these will be inherited by all namespaces /
7433	dflt->autoconf = ipv6_defaults.autoconf;
7434	dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7435
7436	dflt->stable_secret.initialized = false;
7437	all->stable_secret.initialized = false;
7438
7439	net->ipv6.devconf_all = all;
7440	net->ipv6.devconf_dflt = dflt;
7441
7442	#ifdef CONFIG_SYSCTL
7443	err = __addrconf_sysctl_register(net, dev_name: "all", NULL, p: all);
7444	if (err < `0`)
7445	goto err_reg_all;
7446
7447	err = __addrconf_sysctl_register(net, dev_name: "default", NULL, p: dflt);
7448	if (err < `0`)
7449	goto err_reg_dflt;
7450	#endif
7451	return `0`;
7452
7453	#ifdef CONFIG_SYSCTL
7454	err_reg_dflt:
7455	__addrconf_sysctl_unregister(net, p: all, NETCONFA_IFINDEX_ALL);
7456	err_reg_all:
7457	kfree(objp: dflt);
7458	net->ipv6.devconf_dflt = NULL;
7459	#endif
7460	err_alloc_dflt:
7461	kfree(objp: all);
7462	net->ipv6.devconf_all = NULL;
7463	err_alloc_all:
7464	kfree(objp: net->ipv6.inet6_addr_lst);
7465	err_alloc_addr:
7466	return err;
7467	}
7468
7469	static void __net_exit addrconf_exit_net(struct net *net)
7470	{
7471	int i;
7472
7473	#ifdef CONFIG_SYSCTL
7474	__addrconf_sysctl_unregister(net, p: net->ipv6.devconf_dflt,
7475	NETCONFA_IFINDEX_DEFAULT);
7476	__addrconf_sysctl_unregister(net, p: net->ipv6.devconf_all,
7477	NETCONFA_IFINDEX_ALL);
7478	#endif
7479	kfree(objp: net->ipv6.devconf_dflt);
7480	net->ipv6.devconf_dflt = NULL;
7481	kfree(objp: net->ipv6.devconf_all);
7482	net->ipv6.devconf_all = NULL;
7483
7484	cancel_delayed_work_sync(dwork: &net->ipv6.addr_chk_work);
7485	/*
7486	* Check hash table, then free it.
7487	*/
7488	for (i = `0`; i < IN6_ADDR_HSIZE; i++)
7489	WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7490
7491	kfree(objp: net->ipv6.inet6_addr_lst);
7492	net->ipv6.inet6_addr_lst = NULL;
7493	}
7494
7495	static struct pernet_operations addrconf_ops = {
7496	.init = addrconf_init_net,
7497	.exit = addrconf_exit_net,
7498	};
7499
7500	static struct rtnl_af_ops inet6_ops __read_mostly = {
7501	.family = AF_INET6,
7502	.fill_link_af = inet6_fill_link_af,
7503	.get_link_af_size = inet6_get_link_af_size,
7504	.validate_link_af = inet6_validate_link_af,
7505	.set_link_af = inet6_set_link_af,
7506	};
7507
7508	static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = {
7509	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK,
7510	.dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED},
7511	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR,
7512	.doit = inet6_rtm_newaddr, .flags = RTNL_FLAG_DOIT_PERNET},
7513	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR,
7514	.doit = inet6_rtm_deladdr, .flags = RTNL_FLAG_DOIT_PERNET},
7515	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR,
7516	.doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr,
7517	.flags = RTNL_FLAG_DOIT_UNLOCKED \| RTNL_FLAG_DUMP_UNLOCKED},
7518	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST,
7519	.dumpit = inet6_dump_ifmcaddr,
7520	.flags = RTNL_FLAG_DUMP_UNLOCKED},
7521	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST,
7522	.dumpit = inet6_dump_ifacaddr,
7523	.flags = RTNL_FLAG_DUMP_UNLOCKED},
7524	{.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF,
7525	.doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf,
7526	.flags = RTNL_FLAG_DOIT_UNLOCKED \| RTNL_FLAG_DUMP_UNLOCKED},
7527	};
7528
7529	/*
7530	* Init / cleanup code
7531	*/
7532
7533	int __init addrconf_init(void)
7534	{
7535	struct inet6_dev *idev;
7536	int err;
7537
7538	err = ipv6_addr_label_init();
7539	if (err < `0`) {
7540	pr_crit("%s: cannot initialize default policy table: %d\n",
7541	__func__, err);
7542	goto out;
7543	}
7544
7545	err = register_pernet_subsys(&addrconf_ops);
7546	if (err < `0`)
7547	goto out_addrlabel;
7548
7549	/ All works using addrconf_wq need to lock rtnl. /
7550	addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7551	if (!addrconf_wq) {
7552	err = -ENOMEM;
7553	goto out_nowq;
7554	}
7555
7556	rtnl_net_lock(net: &init_net);
7557	idev = ipv6_add_dev(dev: blackhole_netdev);
7558	rtnl_net_unlock(net: &init_net);
7559	if (IS_ERR(ptr: idev)) {
7560	err = PTR_ERR(ptr: idev);
7561	goto errlo;
7562	}
7563
7564	ip6_route_init_special_entries();
7565
7566	register_netdevice_notifier(nb: &ipv6_dev_notf);
7567
7568	addrconf_verify(net: &init_net);
7569
7570	err = rtnl_af_register(ops: &inet6_ops);
7571	if (err)
7572	goto erraf;
7573
7574	err = rtnl_register_many(addrconf_rtnl_msg_handlers);
7575	if (err)
7576	goto errout;
7577
7578	err = ipv6_addr_label_rtnl_register();
7579	if (err < `0`)
7580	goto errout;
7581
7582	return `0`;
7583	errout:
7584	rtnl_unregister_all(PF_INET6);
7585	rtnl_af_unregister(ops: &inet6_ops);
7586	erraf:
7587	unregister_netdevice_notifier(nb: &ipv6_dev_notf);
7588	errlo:
7589	destroy_workqueue(wq: addrconf_wq);
7590	out_nowq:
7591	unregister_pernet_subsys(&addrconf_ops);
7592	out_addrlabel:
7593	ipv6_addr_label_cleanup();
7594	out:
7595	return err;
7596	}
7597
7598	void addrconf_cleanup(void)
7599	{
7600	struct net_device *dev;
7601
7602	unregister_netdevice_notifier(nb: &ipv6_dev_notf);
7603	unregister_pernet_subsys(&addrconf_ops);
7604	ipv6_addr_label_cleanup();
7605
7606	rtnl_af_unregister(ops: &inet6_ops);
7607
7608	rtnl_net_lock(net: &init_net);
7609
7610	/ clean dev list /
7611	for_each_netdev(&init_net, dev) {
7612	if (!__in6_dev_get_rtnl_net(dev))
7613	continue;
7614	addrconf_ifdown(dev, unregister: true);
7615	}
7616	addrconf_ifdown(dev: init_net.loopback_dev, unregister: true);
7617
7618	rtnl_net_unlock(net: &init_net);
7619
7620	destroy_workqueue(wq: addrconf_wq);
7621	}
7622

Browse the source code of Linux/net/ipv6/addrconf.c