2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #define pr_fmt(fmt) "IPv6: " fmt
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
61 #include <linux/sysctl.h>
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
69 #include <net/net_namespace.h>
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
96 /* Set to 3 to get tracing... */
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110 static inline u32
cstamp_delta(unsigned long cstamp
)
112 return (cstamp
- INITIAL_JIFFIES
) * 100UL / HZ
;
116 static int addrconf_sysctl_register(struct inet6_dev
*idev
);
117 static void addrconf_sysctl_unregister(struct inet6_dev
*idev
);
119 static inline int addrconf_sysctl_register(struct inet6_dev
*idev
)
124 static inline void addrconf_sysctl_unregister(struct inet6_dev
*idev
)
129 static void __ipv6_regen_rndid(struct inet6_dev
*idev
);
130 static void __ipv6_try_regen_rndid(struct inet6_dev
*idev
, struct in6_addr
*tmpaddr
);
131 static void ipv6_regen_rndid(unsigned long data
);
133 static int ipv6_generate_eui64(u8
*eui
, struct net_device
*dev
);
134 static int ipv6_count_addresses(struct inet6_dev
*idev
);
135 static int ipv6_generate_stable_address(struct in6_addr
*addr
,
137 const struct inet6_dev
*idev
);
140 * Configured unicast address hash table
142 static struct hlist_head inet6_addr_lst
[IN6_ADDR_HSIZE
];
143 static DEFINE_SPINLOCK(addrconf_hash_lock
);
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct
*);
149 static struct workqueue_struct
*addrconf_wq
;
150 static DECLARE_DELAYED_WORK(addr_chk_work
, addrconf_verify_work
);
152 static void addrconf_join_anycast(struct inet6_ifaddr
*ifp
);
153 static void addrconf_leave_anycast(struct inet6_ifaddr
*ifp
);
155 static void addrconf_type_change(struct net_device
*dev
,
156 unsigned long event
);
157 static int addrconf_ifdown(struct net_device
*dev
, int how
);
159 static struct rt6_info
*addrconf_get_prefix_route(const struct in6_addr
*pfx
,
161 const struct net_device
*dev
,
162 u32 flags
, u32 noflags
);
164 static void addrconf_dad_start(struct inet6_ifaddr
*ifp
);
165 static void addrconf_dad_work(struct work_struct
*w
);
166 static void addrconf_dad_completed(struct inet6_ifaddr
*ifp
);
167 static void addrconf_dad_run(struct inet6_dev
*idev
);
168 static void addrconf_rs_timer(unsigned long data
);
169 static void __ipv6_ifa_notify(int event
, struct inet6_ifaddr
*ifa
);
170 static void ipv6_ifa_notify(int event
, struct inet6_ifaddr
*ifa
);
172 static void inet6_prefix_notify(int event
, struct inet6_dev
*idev
,
173 struct prefix_info
*pinfo
);
174 static bool ipv6_chk_same_addr(struct net
*net
, const struct in6_addr
*addr
,
175 struct net_device
*dev
);
177 static struct ipv6_devconf ipv6_devconf __read_mostly
= {
179 .hop_limit
= IPV6_DEFAULT_HOPLIMIT
,
180 .mtu6
= IPV6_MIN_MTU
,
182 .accept_redirects
= 1,
184 .force_mld_version
= 0,
185 .mldv1_unsolicited_report_interval
= 10 * HZ
,
186 .mldv2_unsolicited_report_interval
= HZ
,
188 .rtr_solicits
= MAX_RTR_SOLICITATIONS
,
189 .rtr_solicit_interval
= RTR_SOLICITATION_INTERVAL
,
190 .rtr_solicit_delay
= MAX_RTR_SOLICITATION_DELAY
,
192 .temp_valid_lft
= TEMP_VALID_LIFETIME
,
193 .temp_prefered_lft
= TEMP_PREFERRED_LIFETIME
,
194 .regen_max_retry
= REGEN_MAX_RETRY
,
195 .max_desync_factor
= MAX_DESYNC_FACTOR
,
196 .max_addresses
= IPV6_MAX_ADDRESSES
,
197 .accept_ra_defrtr
= 1,
198 .accept_ra_from_local
= 0,
199 .accept_ra_min_hop_limit
= 1,
200 .accept_ra_pinfo
= 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref
= 1,
203 .rtr_probe_interval
= 60 * HZ
,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen
= 0,
209 .accept_source_route
= 0, /* we do not accept RH0 by default. */
212 .suppress_frag_ndisc
= 1,
215 .initialized
= false,
217 .use_oif_addrs_only
= 0,
218 .ignore_routes_with_linkdown
= 0,
221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly
= {
223 .hop_limit
= IPV6_DEFAULT_HOPLIMIT
,
224 .mtu6
= IPV6_MIN_MTU
,
226 .accept_redirects
= 1,
228 .force_mld_version
= 0,
229 .mldv1_unsolicited_report_interval
= 10 * HZ
,
230 .mldv2_unsolicited_report_interval
= HZ
,
232 .rtr_solicits
= MAX_RTR_SOLICITATIONS
,
233 .rtr_solicit_interval
= RTR_SOLICITATION_INTERVAL
,
234 .rtr_solicit_delay
= MAX_RTR_SOLICITATION_DELAY
,
236 .temp_valid_lft
= TEMP_VALID_LIFETIME
,
237 .temp_prefered_lft
= TEMP_PREFERRED_LIFETIME
,
238 .regen_max_retry
= REGEN_MAX_RETRY
,
239 .max_desync_factor
= MAX_DESYNC_FACTOR
,
240 .max_addresses
= IPV6_MAX_ADDRESSES
,
241 .accept_ra_defrtr
= 1,
242 .accept_ra_from_local
= 0,
243 .accept_ra_min_hop_limit
= 1,
244 .accept_ra_pinfo
= 1,
245 #ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref
= 1,
247 .rtr_probe_interval
= 60 * HZ
,
248 #ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen
= 0,
253 .accept_source_route
= 0, /* we do not accept RH0 by default. */
256 .suppress_frag_ndisc
= 1,
259 .initialized
= false,
261 .use_oif_addrs_only
= 0,
262 .ignore_routes_with_linkdown
= 0,
265 /* Check if a valid qdisc is available */
266 static inline bool addrconf_qdisc_ok(const struct net_device
*dev
)
268 return !qdisc_tx_is_noop(dev
);
271 static void addrconf_del_rs_timer(struct inet6_dev
*idev
)
273 if (del_timer(&idev
->rs_timer
))
277 static void addrconf_del_dad_work(struct inet6_ifaddr
*ifp
)
279 if (cancel_delayed_work(&ifp
->dad_work
))
283 static void addrconf_mod_rs_timer(struct inet6_dev
*idev
,
286 if (!timer_pending(&idev
->rs_timer
))
288 mod_timer(&idev
->rs_timer
, jiffies
+ when
);
291 static void addrconf_mod_dad_work(struct inet6_ifaddr
*ifp
,
294 if (!delayed_work_pending(&ifp
->dad_work
))
296 mod_delayed_work(addrconf_wq
, &ifp
->dad_work
, delay
);
299 static int snmp6_alloc_dev(struct inet6_dev
*idev
)
303 idev
->stats
.ipv6
= alloc_percpu(struct ipstats_mib
);
304 if (!idev
->stats
.ipv6
)
307 for_each_possible_cpu(i
) {
308 struct ipstats_mib
*addrconf_stats
;
309 addrconf_stats
= per_cpu_ptr(idev
->stats
.ipv6
, i
);
310 u64_stats_init(&addrconf_stats
->syncp
);
314 idev
->stats
.icmpv6dev
= kzalloc(sizeof(struct icmpv6_mib_device
),
316 if (!idev
->stats
.icmpv6dev
)
318 idev
->stats
.icmpv6msgdev
= kzalloc(sizeof(struct icmpv6msg_mib_device
),
320 if (!idev
->stats
.icmpv6msgdev
)
326 kfree(idev
->stats
.icmpv6dev
);
328 free_percpu(idev
->stats
.ipv6
);
333 static struct inet6_dev
*ipv6_add_dev(struct net_device
*dev
)
335 struct inet6_dev
*ndev
;
340 if (dev
->mtu
< IPV6_MIN_MTU
)
341 return ERR_PTR(-EINVAL
);
343 ndev
= kzalloc(sizeof(struct inet6_dev
), GFP_KERNEL
);
347 rwlock_init(&ndev
->lock
);
349 INIT_LIST_HEAD(&ndev
->addr_list
);
350 setup_timer(&ndev
->rs_timer
, addrconf_rs_timer
,
351 (unsigned long)ndev
);
352 memcpy(&ndev
->cnf
, dev_net(dev
)->ipv6
.devconf_dflt
, sizeof(ndev
->cnf
));
353 ndev
->cnf
.mtu6
= dev
->mtu
;
354 ndev
->cnf
.sysctl
= NULL
;
355 ndev
->nd_parms
= neigh_parms_alloc(dev
, &nd_tbl
);
356 if (!ndev
->nd_parms
) {
360 if (ndev
->cnf
.forwarding
)
361 dev_disable_lro(dev
);
362 /* We refer to the device */
365 if (snmp6_alloc_dev(ndev
) < 0) {
367 "%s: cannot allocate memory for statistics; dev=%s.\n",
368 __func__
, dev
->name
);
369 neigh_parms_release(&nd_tbl
, ndev
->nd_parms
);
375 if (snmp6_register_dev(ndev
) < 0) {
377 "%s: cannot create /proc/net/dev_snmp6/%s\n",
378 __func__
, dev
->name
);
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
387 if (dev
->flags
& (IFF_NOARP
| IFF_LOOPBACK
))
388 ndev
->cnf
.accept_dad
= -1;
390 #if IS_ENABLED(CONFIG_IPV6_SIT)
391 if (dev
->type
== ARPHRD_SIT
&& (dev
->priv_flags
& IFF_ISATAP
)) {
392 pr_info("%s: Disabled Multicast RS\n", dev
->name
);
393 ndev
->cnf
.rtr_solicits
= 0;
397 INIT_LIST_HEAD(&ndev
->tempaddr_list
);
398 setup_timer(&ndev
->regen_timer
, ipv6_regen_rndid
, (unsigned long)ndev
);
399 if ((dev
->flags
&IFF_LOOPBACK
) ||
400 dev
->type
== ARPHRD_TUNNEL
||
401 dev
->type
== ARPHRD_TUNNEL6
||
402 dev
->type
== ARPHRD_SIT
||
403 dev
->type
== ARPHRD_NONE
) {
404 ndev
->cnf
.use_tempaddr
= -1;
407 ipv6_regen_rndid((unsigned long) ndev
);
410 ndev
->token
= in6addr_any
;
412 if (netif_running(dev
) && addrconf_qdisc_ok(dev
))
413 ndev
->if_flags
|= IF_READY
;
415 ipv6_mc_init_dev(ndev
);
416 ndev
->tstamp
= jiffies
;
417 err
= addrconf_sysctl_register(ndev
);
419 ipv6_mc_destroy_dev(ndev
);
420 del_timer(&ndev
->regen_timer
);
423 /* protected by rtnl_lock */
424 rcu_assign_pointer(dev
->ip6_ptr
, ndev
);
426 /* Join interface-local all-node multicast group */
427 ipv6_dev_mc_inc(dev
, &in6addr_interfacelocal_allnodes
);
429 /* Join all-node multicast group */
430 ipv6_dev_mc_inc(dev
, &in6addr_linklocal_allnodes
);
432 /* Join all-router multicast group if forwarding is set */
433 if (ndev
->cnf
.forwarding
&& (dev
->flags
& IFF_MULTICAST
))
434 ipv6_dev_mc_inc(dev
, &in6addr_linklocal_allrouters
);
439 neigh_parms_release(&nd_tbl
, ndev
->nd_parms
);
441 in6_dev_finish_destroy(ndev
);
445 static struct inet6_dev
*ipv6_find_idev(struct net_device
*dev
)
447 struct inet6_dev
*idev
;
451 idev
= __in6_dev_get(dev
);
453 idev
= ipv6_add_dev(dev
);
458 if (dev
->flags
&IFF_UP
)
463 static int inet6_netconf_msgsize_devconf(int type
)
465 int size
= NLMSG_ALIGN(sizeof(struct netconfmsg
))
466 + nla_total_size(4); /* NETCONFA_IFINDEX */
468 /* type -1 is used for ALL */
469 if (type
== -1 || type
== NETCONFA_FORWARDING
)
470 size
+= nla_total_size(4);
471 #ifdef CONFIG_IPV6_MROUTE
472 if (type
== -1 || type
== NETCONFA_MC_FORWARDING
)
473 size
+= nla_total_size(4);
475 if (type
== -1 || type
== NETCONFA_PROXY_NEIGH
)
476 size
+= nla_total_size(4);
478 if (type
== -1 || type
== NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
)
479 size
+= nla_total_size(4);
484 static int inet6_netconf_fill_devconf(struct sk_buff
*skb
, int ifindex
,
485 struct ipv6_devconf
*devconf
, u32 portid
,
486 u32 seq
, int event
, unsigned int flags
,
489 struct nlmsghdr
*nlh
;
490 struct netconfmsg
*ncm
;
492 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct netconfmsg
),
497 ncm
= nlmsg_data(nlh
);
498 ncm
->ncm_family
= AF_INET6
;
500 if (nla_put_s32(skb
, NETCONFA_IFINDEX
, ifindex
) < 0)
501 goto nla_put_failure
;
503 /* type -1 is used for ALL */
504 if ((type
== -1 || type
== NETCONFA_FORWARDING
) &&
505 nla_put_s32(skb
, NETCONFA_FORWARDING
, devconf
->forwarding
) < 0)
506 goto nla_put_failure
;
507 #ifdef CONFIG_IPV6_MROUTE
508 if ((type
== -1 || type
== NETCONFA_MC_FORWARDING
) &&
509 nla_put_s32(skb
, NETCONFA_MC_FORWARDING
,
510 devconf
->mc_forwarding
) < 0)
511 goto nla_put_failure
;
513 if ((type
== -1 || type
== NETCONFA_PROXY_NEIGH
) &&
514 nla_put_s32(skb
, NETCONFA_PROXY_NEIGH
, devconf
->proxy_ndp
) < 0)
515 goto nla_put_failure
;
517 if ((type
== -1 || type
== NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
) &&
518 nla_put_s32(skb
, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
,
519 devconf
->ignore_routes_with_linkdown
) < 0)
520 goto nla_put_failure
;
526 nlmsg_cancel(skb
, nlh
);
530 void inet6_netconf_notify_devconf(struct net
*net
, int type
, int ifindex
,
531 struct ipv6_devconf
*devconf
)
536 skb
= nlmsg_new(inet6_netconf_msgsize_devconf(type
), GFP_ATOMIC
);
540 err
= inet6_netconf_fill_devconf(skb
, ifindex
, devconf
, 0, 0,
541 RTM_NEWNETCONF
, 0, type
);
543 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
544 WARN_ON(err
== -EMSGSIZE
);
548 rtnl_notify(skb
, net
, 0, RTNLGRP_IPV6_NETCONF
, NULL
, GFP_ATOMIC
);
551 rtnl_set_sk_err(net
, RTNLGRP_IPV6_NETCONF
, err
);
554 static const struct nla_policy devconf_ipv6_policy
[NETCONFA_MAX
+1] = {
555 [NETCONFA_IFINDEX
] = { .len
= sizeof(int) },
556 [NETCONFA_FORWARDING
] = { .len
= sizeof(int) },
557 [NETCONFA_PROXY_NEIGH
] = { .len
= sizeof(int) },
558 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
] = { .len
= sizeof(int) },
561 static int inet6_netconf_get_devconf(struct sk_buff
*in_skb
,
562 struct nlmsghdr
*nlh
)
564 struct net
*net
= sock_net(in_skb
->sk
);
565 struct nlattr
*tb
[NETCONFA_MAX
+1];
566 struct netconfmsg
*ncm
;
568 struct ipv6_devconf
*devconf
;
569 struct inet6_dev
*in6_dev
;
570 struct net_device
*dev
;
574 err
= nlmsg_parse(nlh
, sizeof(*ncm
), tb
, NETCONFA_MAX
,
575 devconf_ipv6_policy
);
580 if (!tb
[NETCONFA_IFINDEX
])
583 ifindex
= nla_get_s32(tb
[NETCONFA_IFINDEX
]);
585 case NETCONFA_IFINDEX_ALL
:
586 devconf
= net
->ipv6
.devconf_all
;
588 case NETCONFA_IFINDEX_DEFAULT
:
589 devconf
= net
->ipv6
.devconf_dflt
;
592 dev
= __dev_get_by_index(net
, ifindex
);
595 in6_dev
= __in6_dev_get(dev
);
598 devconf
= &in6_dev
->cnf
;
603 skb
= nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC
);
607 err
= inet6_netconf_fill_devconf(skb
, ifindex
, devconf
,
608 NETLINK_CB(in_skb
).portid
,
609 nlh
->nlmsg_seq
, RTM_NEWNETCONF
, 0,
612 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
613 WARN_ON(err
== -EMSGSIZE
);
617 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
622 static int inet6_netconf_dump_devconf(struct sk_buff
*skb
,
623 struct netlink_callback
*cb
)
625 struct net
*net
= sock_net(skb
->sk
);
628 struct net_device
*dev
;
629 struct inet6_dev
*idev
;
630 struct hlist_head
*head
;
633 s_idx
= idx
= cb
->args
[1];
635 for (h
= s_h
; h
< NETDEV_HASHENTRIES
; h
++, s_idx
= 0) {
637 head
= &net
->dev_index_head
[h
];
639 cb
->seq
= atomic_read(&net
->ipv6
.dev_addr_genid
) ^
641 hlist_for_each_entry_rcu(dev
, head
, index_hlist
) {
644 idev
= __in6_dev_get(dev
);
648 if (inet6_netconf_fill_devconf(skb
, dev
->ifindex
,
650 NETLINK_CB(cb
->skb
).portid
,
658 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
664 if (h
== NETDEV_HASHENTRIES
) {
665 if (inet6_netconf_fill_devconf(skb
, NETCONFA_IFINDEX_ALL
,
666 net
->ipv6
.devconf_all
,
667 NETLINK_CB(cb
->skb
).portid
,
669 RTM_NEWNETCONF
, NLM_F_MULTI
,
675 if (h
== NETDEV_HASHENTRIES
+ 1) {
676 if (inet6_netconf_fill_devconf(skb
, NETCONFA_IFINDEX_DEFAULT
,
677 net
->ipv6
.devconf_dflt
,
678 NETLINK_CB(cb
->skb
).portid
,
680 RTM_NEWNETCONF
, NLM_F_MULTI
,
694 static void dev_forward_change(struct inet6_dev
*idev
)
696 struct net_device
*dev
;
697 struct inet6_ifaddr
*ifa
;
702 if (idev
->cnf
.forwarding
)
703 dev_disable_lro(dev
);
704 if (dev
->flags
& IFF_MULTICAST
) {
705 if (idev
->cnf
.forwarding
) {
706 ipv6_dev_mc_inc(dev
, &in6addr_linklocal_allrouters
);
707 ipv6_dev_mc_inc(dev
, &in6addr_interfacelocal_allrouters
);
708 ipv6_dev_mc_inc(dev
, &in6addr_sitelocal_allrouters
);
710 ipv6_dev_mc_dec(dev
, &in6addr_linklocal_allrouters
);
711 ipv6_dev_mc_dec(dev
, &in6addr_interfacelocal_allrouters
);
712 ipv6_dev_mc_dec(dev
, &in6addr_sitelocal_allrouters
);
716 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
717 if (ifa
->flags
&IFA_F_TENTATIVE
)
719 if (idev
->cnf
.forwarding
)
720 addrconf_join_anycast(ifa
);
722 addrconf_leave_anycast(ifa
);
724 inet6_netconf_notify_devconf(dev_net(dev
), NETCONFA_FORWARDING
,
725 dev
->ifindex
, &idev
->cnf
);
729 static void addrconf_forward_change(struct net
*net
, __s32 newf
)
731 struct net_device
*dev
;
732 struct inet6_dev
*idev
;
734 for_each_netdev(net
, dev
) {
735 idev
= __in6_dev_get(dev
);
737 int changed
= (!idev
->cnf
.forwarding
) ^ (!newf
);
738 idev
->cnf
.forwarding
= newf
;
740 dev_forward_change(idev
);
745 static int addrconf_fixup_forwarding(struct ctl_table
*table
, int *p
, int newf
)
751 return restart_syscall();
753 net
= (struct net
*)table
->extra2
;
757 if (p
== &net
->ipv6
.devconf_dflt
->forwarding
) {
758 if ((!newf
) ^ (!old
))
759 inet6_netconf_notify_devconf(net
, NETCONFA_FORWARDING
,
760 NETCONFA_IFINDEX_DEFAULT
,
761 net
->ipv6
.devconf_dflt
);
766 if (p
== &net
->ipv6
.devconf_all
->forwarding
) {
767 net
->ipv6
.devconf_dflt
->forwarding
= newf
;
768 addrconf_forward_change(net
, newf
);
769 if ((!newf
) ^ (!old
))
770 inet6_netconf_notify_devconf(net
, NETCONFA_FORWARDING
,
771 NETCONFA_IFINDEX_ALL
,
772 net
->ipv6
.devconf_all
);
773 } else if ((!newf
) ^ (!old
))
774 dev_forward_change((struct inet6_dev
*)table
->extra1
);
778 rt6_purge_dflt_routers(net
);
782 static void addrconf_linkdown_change(struct net
*net
, __s32 newf
)
784 struct net_device
*dev
;
785 struct inet6_dev
*idev
;
787 for_each_netdev(net
, dev
) {
788 idev
= __in6_dev_get(dev
);
790 int changed
= (!idev
->cnf
.ignore_routes_with_linkdown
) ^ (!newf
);
792 idev
->cnf
.ignore_routes_with_linkdown
= newf
;
794 inet6_netconf_notify_devconf(dev_net(dev
),
795 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
,
802 static int addrconf_fixup_linkdown(struct ctl_table
*table
, int *p
, int newf
)
808 return restart_syscall();
810 net
= (struct net
*)table
->extra2
;
814 if (p
== &net
->ipv6
.devconf_dflt
->ignore_routes_with_linkdown
) {
815 if ((!newf
) ^ (!old
))
816 inet6_netconf_notify_devconf(net
,
817 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
,
818 NETCONFA_IFINDEX_DEFAULT
,
819 net
->ipv6
.devconf_dflt
);
824 if (p
== &net
->ipv6
.devconf_all
->ignore_routes_with_linkdown
) {
825 net
->ipv6
.devconf_dflt
->ignore_routes_with_linkdown
= newf
;
826 addrconf_linkdown_change(net
, newf
);
827 if ((!newf
) ^ (!old
))
828 inet6_netconf_notify_devconf(net
,
829 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN
,
830 NETCONFA_IFINDEX_ALL
,
831 net
->ipv6
.devconf_all
);
840 /* Nobody refers to this ifaddr, destroy it */
841 void inet6_ifa_finish_destroy(struct inet6_ifaddr
*ifp
)
843 WARN_ON(!hlist_unhashed(&ifp
->addr_lst
));
845 #ifdef NET_REFCNT_DEBUG
846 pr_debug("%s\n", __func__
);
849 in6_dev_put(ifp
->idev
);
851 if (cancel_delayed_work(&ifp
->dad_work
))
852 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
855 if (ifp
->state
!= INET6_IFADDR_STATE_DEAD
) {
856 pr_warn("Freeing alive inet6 address %p\n", ifp
);
865 ipv6_link_dev_addr(struct inet6_dev
*idev
, struct inet6_ifaddr
*ifp
)
868 int ifp_scope
= ipv6_addr_src_scope(&ifp
->addr
);
871 * Each device address list is sorted in order of scope -
872 * global before linklocal.
874 list_for_each(p
, &idev
->addr_list
) {
875 struct inet6_ifaddr
*ifa
876 = list_entry(p
, struct inet6_ifaddr
, if_list
);
877 if (ifp_scope
>= ipv6_addr_src_scope(&ifa
->addr
))
881 list_add_tail(&ifp
->if_list
, p
);
884 static u32
inet6_addr_hash(const struct in6_addr
*addr
)
886 return hash_32(ipv6_addr_hash(addr
), IN6_ADDR_HSIZE_SHIFT
);
889 /* On success it returns ifp with increased reference count */
891 static struct inet6_ifaddr
*
892 ipv6_add_addr(struct inet6_dev
*idev
, const struct in6_addr
*addr
,
893 const struct in6_addr
*peer_addr
, int pfxlen
,
894 int scope
, u32 flags
, u32 valid_lft
, u32 prefered_lft
)
896 struct inet6_ifaddr
*ifa
= NULL
;
900 int addr_type
= ipv6_addr_type(addr
);
902 if (addr_type
== IPV6_ADDR_ANY
||
903 addr_type
& IPV6_ADDR_MULTICAST
||
904 (!(idev
->dev
->flags
& IFF_LOOPBACK
) &&
905 addr_type
& IPV6_ADDR_LOOPBACK
))
906 return ERR_PTR(-EADDRNOTAVAIL
);
910 err
= -ENODEV
; /*XXX*/
914 if (idev
->cnf
.disable_ipv6
) {
919 spin_lock(&addrconf_hash_lock
);
921 /* Ignore adding duplicate addresses on an interface */
922 if (ipv6_chk_same_addr(dev_net(idev
->dev
), addr
, idev
->dev
)) {
923 ADBG("ipv6_add_addr: already assigned\n");
928 ifa
= kzalloc(sizeof(struct inet6_ifaddr
), GFP_ATOMIC
);
931 ADBG("ipv6_add_addr: malloc failed\n");
936 rt
= addrconf_dst_alloc(idev
, addr
, false);
942 neigh_parms_data_state_setall(idev
->nd_parms
);
946 ifa
->peer_addr
= *peer_addr
;
948 spin_lock_init(&ifa
->lock
);
949 INIT_DELAYED_WORK(&ifa
->dad_work
, addrconf_dad_work
);
950 INIT_HLIST_NODE(&ifa
->addr_lst
);
952 ifa
->prefix_len
= pfxlen
;
953 ifa
->flags
= flags
| IFA_F_TENTATIVE
;
954 ifa
->valid_lft
= valid_lft
;
955 ifa
->prefered_lft
= prefered_lft
;
956 ifa
->cstamp
= ifa
->tstamp
= jiffies
;
957 ifa
->tokenized
= false;
966 /* Add to big hash table */
967 hash
= inet6_addr_hash(addr
);
969 hlist_add_head_rcu(&ifa
->addr_lst
, &inet6_addr_lst
[hash
]);
970 spin_unlock(&addrconf_hash_lock
);
972 write_lock(&idev
->lock
);
973 /* Add to inet6_dev unicast addr list. */
974 ipv6_link_dev_addr(idev
, ifa
);
976 if (ifa
->flags
&IFA_F_TEMPORARY
) {
977 list_add(&ifa
->tmp_list
, &idev
->tempaddr_list
);
982 write_unlock(&idev
->lock
);
984 rcu_read_unlock_bh();
986 if (likely(err
== 0))
987 inet6addr_notifier_call_chain(NETDEV_UP
, ifa
);
995 spin_unlock(&addrconf_hash_lock
);
999 enum cleanup_prefix_rt_t
{
1000 CLEANUP_PREFIX_RT_NOP
, /* no cleanup action for prefix route */
1001 CLEANUP_PREFIX_RT_DEL
, /* delete the prefix route */
1002 CLEANUP_PREFIX_RT_EXPIRE
, /* update the lifetime of the prefix route */
1006 * Check, whether the prefix for ifp would still need a prefix route
1007 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1010 * 1) we don't purge prefix if address was not permanent.
1011 * prefix is managed by its own lifetime.
1012 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1013 * 3) if there are no addresses, delete prefix.
1014 * 4) if there are still other permanent address(es),
1015 * corresponding prefix is still permanent.
1016 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1017 * don't purge the prefix, assume user space is managing it.
1018 * 6) otherwise, update prefix lifetime to the
1019 * longest valid lifetime among the corresponding
1020 * addresses on the device.
1021 * Note: subsequent RA will update lifetime.
1023 static enum cleanup_prefix_rt_t
1024 check_cleanup_prefix_route(struct inet6_ifaddr
*ifp
, unsigned long *expires
)
1026 struct inet6_ifaddr
*ifa
;
1027 struct inet6_dev
*idev
= ifp
->idev
;
1028 unsigned long lifetime
;
1029 enum cleanup_prefix_rt_t action
= CLEANUP_PREFIX_RT_DEL
;
1033 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
1036 if (!ipv6_prefix_equal(&ifa
->addr
, &ifp
->addr
,
1039 if (ifa
->flags
& (IFA_F_PERMANENT
| IFA_F_NOPREFIXROUTE
))
1040 return CLEANUP_PREFIX_RT_NOP
;
1042 action
= CLEANUP_PREFIX_RT_EXPIRE
;
1044 spin_lock(&ifa
->lock
);
1046 lifetime
= addrconf_timeout_fixup(ifa
->valid_lft
, HZ
);
1048 * Note: Because this address is
1049 * not permanent, lifetime <
1050 * LONG_MAX / HZ here.
1052 if (time_before(*expires
, ifa
->tstamp
+ lifetime
* HZ
))
1053 *expires
= ifa
->tstamp
+ lifetime
* HZ
;
1054 spin_unlock(&ifa
->lock
);
1061 cleanup_prefix_route(struct inet6_ifaddr
*ifp
, unsigned long expires
, bool del_rt
)
1063 struct rt6_info
*rt
;
1065 rt
= addrconf_get_prefix_route(&ifp
->addr
,
1068 0, RTF_GATEWAY
| RTF_DEFAULT
);
1073 if (!(rt
->rt6i_flags
& RTF_EXPIRES
))
1074 rt6_set_expires(rt
, expires
);
1081 /* This function wants to get referenced ifp and releases it before return */
1083 static void ipv6_del_addr(struct inet6_ifaddr
*ifp
)
1086 enum cleanup_prefix_rt_t action
= CLEANUP_PREFIX_RT_NOP
;
1087 unsigned long expires
;
1091 spin_lock_bh(&ifp
->lock
);
1093 ifp
->state
= INET6_IFADDR_STATE_DEAD
;
1094 spin_unlock_bh(&ifp
->lock
);
1096 if (state
== INET6_IFADDR_STATE_DEAD
)
1099 spin_lock_bh(&addrconf_hash_lock
);
1100 hlist_del_init_rcu(&ifp
->addr_lst
);
1101 spin_unlock_bh(&addrconf_hash_lock
);
1103 write_lock_bh(&ifp
->idev
->lock
);
1105 if (ifp
->flags
&IFA_F_TEMPORARY
) {
1106 list_del(&ifp
->tmp_list
);
1108 in6_ifa_put(ifp
->ifpub
);
1114 if (ifp
->flags
& IFA_F_PERMANENT
&& !(ifp
->flags
& IFA_F_NOPREFIXROUTE
))
1115 action
= check_cleanup_prefix_route(ifp
, &expires
);
1117 list_del_init(&ifp
->if_list
);
1120 write_unlock_bh(&ifp
->idev
->lock
);
1122 addrconf_del_dad_work(ifp
);
1124 ipv6_ifa_notify(RTM_DELADDR
, ifp
);
1126 inet6addr_notifier_call_chain(NETDEV_DOWN
, ifp
);
1128 if (action
!= CLEANUP_PREFIX_RT_NOP
) {
1129 cleanup_prefix_route(ifp
, expires
,
1130 action
== CLEANUP_PREFIX_RT_DEL
);
1133 /* clean up prefsrc entries */
1134 rt6_remove_prefsrc(ifp
);
1139 static int ipv6_create_tempaddr(struct inet6_ifaddr
*ifp
, struct inet6_ifaddr
*ift
)
1141 struct inet6_dev
*idev
= ifp
->idev
;
1142 struct in6_addr addr
, *tmpaddr
;
1143 unsigned long tmp_prefered_lft
, tmp_valid_lft
, tmp_tstamp
, age
;
1144 unsigned long regen_advance
;
1148 unsigned long now
= jiffies
;
1150 write_lock_bh(&idev
->lock
);
1152 spin_lock_bh(&ift
->lock
);
1153 memcpy(&addr
.s6_addr
[8], &ift
->addr
.s6_addr
[8], 8);
1154 spin_unlock_bh(&ift
->lock
);
1161 if (idev
->cnf
.use_tempaddr
<= 0) {
1162 write_unlock_bh(&idev
->lock
);
1163 pr_info("%s: use_tempaddr is disabled\n", __func__
);
1168 spin_lock_bh(&ifp
->lock
);
1169 if (ifp
->regen_count
++ >= idev
->cnf
.regen_max_retry
) {
1170 idev
->cnf
.use_tempaddr
= -1; /*XXX*/
1171 spin_unlock_bh(&ifp
->lock
);
1172 write_unlock_bh(&idev
->lock
);
1173 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1180 memcpy(addr
.s6_addr
, ifp
->addr
.s6_addr
, 8);
1181 __ipv6_try_regen_rndid(idev
, tmpaddr
);
1182 memcpy(&addr
.s6_addr
[8], idev
->rndid
, 8);
1183 age
= (now
- ifp
->tstamp
) / HZ
;
1184 tmp_valid_lft
= min_t(__u32
,
1186 idev
->cnf
.temp_valid_lft
+ age
);
1187 tmp_prefered_lft
= min_t(__u32
,
1189 idev
->cnf
.temp_prefered_lft
+ age
-
1190 idev
->cnf
.max_desync_factor
);
1191 tmp_plen
= ifp
->prefix_len
;
1192 tmp_tstamp
= ifp
->tstamp
;
1193 spin_unlock_bh(&ifp
->lock
);
1195 regen_advance
= idev
->cnf
.regen_max_retry
*
1196 idev
->cnf
.dad_transmits
*
1197 NEIGH_VAR(idev
->nd_parms
, RETRANS_TIME
) / HZ
;
1198 write_unlock_bh(&idev
->lock
);
1200 /* A temporary address is created only if this calculated Preferred
1201 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1202 * an implementation must not create a temporary address with a zero
1203 * Preferred Lifetime.
1204 * Use age calculation as in addrconf_verify to avoid unnecessary
1205 * temporary addresses being generated.
1207 age
= (now
- tmp_tstamp
+ ADDRCONF_TIMER_FUZZ_MINUS
) / HZ
;
1208 if (tmp_prefered_lft
<= regen_advance
+ age
) {
1215 addr_flags
= IFA_F_TEMPORARY
;
1216 /* set in addrconf_prefix_rcv() */
1217 if (ifp
->flags
& IFA_F_OPTIMISTIC
)
1218 addr_flags
|= IFA_F_OPTIMISTIC
;
1220 ift
= ipv6_add_addr(idev
, &addr
, NULL
, tmp_plen
,
1221 ipv6_addr_scope(&addr
), addr_flags
,
1222 tmp_valid_lft
, tmp_prefered_lft
);
1226 pr_info("%s: retry temporary address regeneration\n", __func__
);
1228 write_lock_bh(&idev
->lock
);
1232 spin_lock_bh(&ift
->lock
);
1235 ift
->tstamp
= tmp_tstamp
;
1236 spin_unlock_bh(&ift
->lock
);
1238 addrconf_dad_start(ift
);
1246 * Choose an appropriate source address (RFC3484)
1249 IPV6_SADDR_RULE_INIT
= 0,
1250 IPV6_SADDR_RULE_LOCAL
,
1251 IPV6_SADDR_RULE_SCOPE
,
1252 IPV6_SADDR_RULE_PREFERRED
,
1253 #ifdef CONFIG_IPV6_MIP6
1254 IPV6_SADDR_RULE_HOA
,
1256 IPV6_SADDR_RULE_OIF
,
1257 IPV6_SADDR_RULE_LABEL
,
1258 IPV6_SADDR_RULE_PRIVACY
,
1259 IPV6_SADDR_RULE_ORCHID
,
1260 IPV6_SADDR_RULE_PREFIX
,
1261 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1262 IPV6_SADDR_RULE_NOT_OPTIMISTIC
,
1267 struct ipv6_saddr_score
{
1270 struct inet6_ifaddr
*ifa
;
1271 DECLARE_BITMAP(scorebits
, IPV6_SADDR_RULE_MAX
);
1276 struct ipv6_saddr_dst
{
1277 const struct in6_addr
*addr
;
1284 static inline int ipv6_saddr_preferred(int type
)
1286 if (type
& (IPV6_ADDR_MAPPED
|IPV6_ADDR_COMPATv4
|IPV6_ADDR_LOOPBACK
))
1291 static inline bool ipv6_use_optimistic_addr(struct inet6_dev
*idev
)
1293 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1294 return idev
&& idev
->cnf
.optimistic_dad
&& idev
->cnf
.use_optimistic
;
1300 static int ipv6_get_saddr_eval(struct net
*net
,
1301 struct ipv6_saddr_score
*score
,
1302 struct ipv6_saddr_dst
*dst
,
1307 if (i
<= score
->rule
) {
1309 case IPV6_SADDR_RULE_SCOPE
:
1310 ret
= score
->scopedist
;
1312 case IPV6_SADDR_RULE_PREFIX
:
1313 ret
= score
->matchlen
;
1316 ret
= !!test_bit(i
, score
->scorebits
);
1322 case IPV6_SADDR_RULE_INIT
:
1323 /* Rule 0: remember if hiscore is not ready yet */
1326 case IPV6_SADDR_RULE_LOCAL
:
1327 /* Rule 1: Prefer same address */
1328 ret
= ipv6_addr_equal(&score
->ifa
->addr
, dst
->addr
);
1330 case IPV6_SADDR_RULE_SCOPE
:
1331 /* Rule 2: Prefer appropriate scope
1336 * ---+--+-+---> scope
1338 * | d is scope of the destination.
1340 * | \ <- smaller scope is better if
1341 * B-15 | \ if scope is enough for destination.
1342 * | ret = B - scope (-1 <= scope >= d <= 15).
1344 * |/ <- greater is better
1345 * -C / if scope is not enough for destination.
1346 * /| ret = scope - C (-1 <= d < scope <= 15).
1348 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1349 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1350 * Assume B = 0 and we get C > 29.
1352 ret
= __ipv6_addr_src_scope(score
->addr_type
);
1353 if (ret
>= dst
->scope
)
1356 ret
-= 128; /* 30 is enough */
1357 score
->scopedist
= ret
;
1359 case IPV6_SADDR_RULE_PREFERRED
:
1361 /* Rule 3: Avoid deprecated and optimistic addresses */
1362 u8 avoid
= IFA_F_DEPRECATED
;
1364 if (!ipv6_use_optimistic_addr(score
->ifa
->idev
))
1365 avoid
|= IFA_F_OPTIMISTIC
;
1366 ret
= ipv6_saddr_preferred(score
->addr_type
) ||
1367 !(score
->ifa
->flags
& avoid
);
1370 #ifdef CONFIG_IPV6_MIP6
1371 case IPV6_SADDR_RULE_HOA
:
1373 /* Rule 4: Prefer home address */
1374 int prefhome
= !(dst
->prefs
& IPV6_PREFER_SRC_COA
);
1375 ret
= !(score
->ifa
->flags
& IFA_F_HOMEADDRESS
) ^ prefhome
;
1379 case IPV6_SADDR_RULE_OIF
:
1380 /* Rule 5: Prefer outgoing interface */
1381 ret
= (!dst
->ifindex
||
1382 dst
->ifindex
== score
->ifa
->idev
->dev
->ifindex
);
1384 case IPV6_SADDR_RULE_LABEL
:
1385 /* Rule 6: Prefer matching label */
1386 ret
= ipv6_addr_label(net
,
1387 &score
->ifa
->addr
, score
->addr_type
,
1388 score
->ifa
->idev
->dev
->ifindex
) == dst
->label
;
1390 case IPV6_SADDR_RULE_PRIVACY
:
1392 /* Rule 7: Prefer public address
1393 * Note: prefer temporary address if use_tempaddr >= 2
1395 int preftmp
= dst
->prefs
& (IPV6_PREFER_SRC_PUBLIC
|IPV6_PREFER_SRC_TMP
) ?
1396 !!(dst
->prefs
& IPV6_PREFER_SRC_TMP
) :
1397 score
->ifa
->idev
->cnf
.use_tempaddr
>= 2;
1398 ret
= (!(score
->ifa
->flags
& IFA_F_TEMPORARY
)) ^ preftmp
;
1401 case IPV6_SADDR_RULE_ORCHID
:
1402 /* Rule 8-: Prefer ORCHID vs ORCHID or
1403 * non-ORCHID vs non-ORCHID
1405 ret
= !(ipv6_addr_orchid(&score
->ifa
->addr
) ^
1406 ipv6_addr_orchid(dst
->addr
));
1408 case IPV6_SADDR_RULE_PREFIX
:
1409 /* Rule 8: Use longest matching prefix */
1410 ret
= ipv6_addr_diff(&score
->ifa
->addr
, dst
->addr
);
1411 if (ret
> score
->ifa
->prefix_len
)
1412 ret
= score
->ifa
->prefix_len
;
1413 score
->matchlen
= ret
;
1415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1416 case IPV6_SADDR_RULE_NOT_OPTIMISTIC
:
1417 /* Optimistic addresses still have lower precedence than other
1418 * preferred addresses.
1420 ret
= !(score
->ifa
->flags
& IFA_F_OPTIMISTIC
);
1428 __set_bit(i
, score
->scorebits
);
1434 static int __ipv6_dev_get_saddr(struct net
*net
,
1435 struct ipv6_saddr_dst
*dst
,
1436 struct inet6_dev
*idev
,
1437 struct ipv6_saddr_score
*scores
,
1440 struct ipv6_saddr_score
*score
= &scores
[1 - hiscore_idx
], *hiscore
= &scores
[hiscore_idx
];
1442 read_lock_bh(&idev
->lock
);
1443 list_for_each_entry(score
->ifa
, &idev
->addr_list
, if_list
) {
1447 * - Tentative Address (RFC2462 section 5.4)
1448 * - A tentative address is not considered
1449 * "assigned to an interface" in the traditional
1450 * sense, unless it is also flagged as optimistic.
1451 * - Candidate Source Address (section 4)
1452 * - In any case, anycast addresses, multicast
1453 * addresses, and the unspecified address MUST
1454 * NOT be included in a candidate set.
1456 if ((score
->ifa
->flags
& IFA_F_TENTATIVE
) &&
1457 (!(score
->ifa
->flags
& IFA_F_OPTIMISTIC
)))
1460 score
->addr_type
= __ipv6_addr_type(&score
->ifa
->addr
);
1462 if (unlikely(score
->addr_type
== IPV6_ADDR_ANY
||
1463 score
->addr_type
& IPV6_ADDR_MULTICAST
)) {
1464 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1470 bitmap_zero(score
->scorebits
, IPV6_SADDR_RULE_MAX
);
1472 for (i
= 0; i
< IPV6_SADDR_RULE_MAX
; i
++) {
1473 int minihiscore
, miniscore
;
1475 minihiscore
= ipv6_get_saddr_eval(net
, hiscore
, dst
, i
);
1476 miniscore
= ipv6_get_saddr_eval(net
, score
, dst
, i
);
1478 if (minihiscore
> miniscore
) {
1479 if (i
== IPV6_SADDR_RULE_SCOPE
&&
1480 score
->scopedist
> 0) {
1483 * each remaining entry
1484 * has too small (not enough)
1485 * scope, because ifa entries
1486 * are sorted by their scope
1492 } else if (minihiscore
< miniscore
) {
1494 in6_ifa_put(hiscore
->ifa
);
1496 in6_ifa_hold(score
->ifa
);
1498 swap(hiscore
, score
);
1499 hiscore_idx
= 1 - hiscore_idx
;
1501 /* restore our iterator */
1502 score
->ifa
= hiscore
->ifa
;
1509 read_unlock_bh(&idev
->lock
);
1513 int ipv6_dev_get_saddr(struct net
*net
, const struct net_device
*dst_dev
,
1514 const struct in6_addr
*daddr
, unsigned int prefs
,
1515 struct in6_addr
*saddr
)
1517 struct ipv6_saddr_score scores
[2], *hiscore
;
1518 struct ipv6_saddr_dst dst
;
1519 struct inet6_dev
*idev
;
1520 struct net_device
*dev
;
1522 bool use_oif_addr
= false;
1523 int hiscore_idx
= 0;
1525 dst_type
= __ipv6_addr_type(daddr
);
1527 dst
.ifindex
= dst_dev
? dst_dev
->ifindex
: 0;
1528 dst
.scope
= __ipv6_addr_src_scope(dst_type
);
1529 dst
.label
= ipv6_addr_label(net
, daddr
, dst_type
, dst
.ifindex
);
1532 scores
[hiscore_idx
].rule
= -1;
1533 scores
[hiscore_idx
].ifa
= NULL
;
1537 /* Candidate Source Address (section 4)
1538 * - multicast and link-local destination address,
1539 * the set of candidate source address MUST only
1540 * include addresses assigned to interfaces
1541 * belonging to the same link as the outgoing
1543 * (- For site-local destination addresses, the
1544 * set of candidate source addresses MUST only
1545 * include addresses assigned to interfaces
1546 * belonging to the same site as the outgoing
1548 * - "It is RECOMMENDED that the candidate source addresses
1549 * be the set of unicast addresses assigned to the
1550 * interface that will be used to send to the destination
1551 * (the 'outgoing' interface)." (RFC 6724)
1554 idev
= __in6_dev_get(dst_dev
);
1555 if ((dst_type
& IPV6_ADDR_MULTICAST
) ||
1556 dst
.scope
<= IPV6_ADDR_SCOPE_LINKLOCAL
||
1557 (idev
&& idev
->cnf
.use_oif_addrs_only
)) {
1558 use_oif_addr
= true;
1564 hiscore_idx
= __ipv6_dev_get_saddr(net
, &dst
, idev
, scores
, hiscore_idx
);
1566 for_each_netdev_rcu(net
, dev
) {
1567 idev
= __in6_dev_get(dev
);
1570 hiscore_idx
= __ipv6_dev_get_saddr(net
, &dst
, idev
, scores
, hiscore_idx
);
1575 hiscore
= &scores
[hiscore_idx
];
1577 return -EADDRNOTAVAIL
;
1579 *saddr
= hiscore
->ifa
->addr
;
1580 in6_ifa_put(hiscore
->ifa
);
1583 EXPORT_SYMBOL(ipv6_dev_get_saddr
);
1585 int __ipv6_get_lladdr(struct inet6_dev
*idev
, struct in6_addr
*addr
,
1588 struct inet6_ifaddr
*ifp
;
1589 int err
= -EADDRNOTAVAIL
;
1591 list_for_each_entry_reverse(ifp
, &idev
->addr_list
, if_list
) {
1592 if (ifp
->scope
> IFA_LINK
)
1594 if (ifp
->scope
== IFA_LINK
&&
1595 !(ifp
->flags
& banned_flags
)) {
1604 int ipv6_get_lladdr(struct net_device
*dev
, struct in6_addr
*addr
,
1607 struct inet6_dev
*idev
;
1608 int err
= -EADDRNOTAVAIL
;
1611 idev
= __in6_dev_get(dev
);
1613 read_lock_bh(&idev
->lock
);
1614 err
= __ipv6_get_lladdr(idev
, addr
, banned_flags
);
1615 read_unlock_bh(&idev
->lock
);
1621 static int ipv6_count_addresses(struct inet6_dev
*idev
)
1624 struct inet6_ifaddr
*ifp
;
1626 read_lock_bh(&idev
->lock
);
1627 list_for_each_entry(ifp
, &idev
->addr_list
, if_list
)
1629 read_unlock_bh(&idev
->lock
);
1633 int ipv6_chk_addr(struct net
*net
, const struct in6_addr
*addr
,
1634 const struct net_device
*dev
, int strict
)
1636 return ipv6_chk_addr_and_flags(net
, addr
, dev
, strict
, IFA_F_TENTATIVE
);
1638 EXPORT_SYMBOL(ipv6_chk_addr
);
1640 int ipv6_chk_addr_and_flags(struct net
*net
, const struct in6_addr
*addr
,
1641 const struct net_device
*dev
, int strict
,
1644 struct inet6_ifaddr
*ifp
;
1645 unsigned int hash
= inet6_addr_hash(addr
);
1649 hlist_for_each_entry_rcu(ifp
, &inet6_addr_lst
[hash
], addr_lst
) {
1650 if (!net_eq(dev_net(ifp
->idev
->dev
), net
))
1652 /* Decouple optimistic from tentative for evaluation here.
1653 * Ban optimistic addresses explicitly, when required.
1655 ifp_flags
= (ifp
->flags
&IFA_F_OPTIMISTIC
)
1656 ? (ifp
->flags
&~IFA_F_TENTATIVE
)
1658 if (ipv6_addr_equal(&ifp
->addr
, addr
) &&
1659 !(ifp_flags
&banned_flags
) &&
1660 (!dev
|| ifp
->idev
->dev
== dev
||
1661 !(ifp
->scope
&(IFA_LINK
|IFA_HOST
) || strict
))) {
1662 rcu_read_unlock_bh();
1667 rcu_read_unlock_bh();
1670 EXPORT_SYMBOL(ipv6_chk_addr_and_flags
);
1672 static bool ipv6_chk_same_addr(struct net
*net
, const struct in6_addr
*addr
,
1673 struct net_device
*dev
)
1675 unsigned int hash
= inet6_addr_hash(addr
);
1676 struct inet6_ifaddr
*ifp
;
1678 hlist_for_each_entry(ifp
, &inet6_addr_lst
[hash
], addr_lst
) {
1679 if (!net_eq(dev_net(ifp
->idev
->dev
), net
))
1681 if (ipv6_addr_equal(&ifp
->addr
, addr
)) {
1682 if (!dev
|| ifp
->idev
->dev
== dev
)
1689 /* Compares an address/prefix_len with addresses on device @dev.
1690 * If one is found it returns true.
1692 bool ipv6_chk_custom_prefix(const struct in6_addr
*addr
,
1693 const unsigned int prefix_len
, struct net_device
*dev
)
1695 struct inet6_dev
*idev
;
1696 struct inet6_ifaddr
*ifa
;
1700 idev
= __in6_dev_get(dev
);
1702 read_lock_bh(&idev
->lock
);
1703 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
1704 ret
= ipv6_prefix_equal(addr
, &ifa
->addr
, prefix_len
);
1708 read_unlock_bh(&idev
->lock
);
1714 EXPORT_SYMBOL(ipv6_chk_custom_prefix
);
1716 int ipv6_chk_prefix(const struct in6_addr
*addr
, struct net_device
*dev
)
1718 struct inet6_dev
*idev
;
1719 struct inet6_ifaddr
*ifa
;
1724 idev
= __in6_dev_get(dev
);
1726 read_lock_bh(&idev
->lock
);
1727 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
1728 onlink
= ipv6_prefix_equal(addr
, &ifa
->addr
,
1733 read_unlock_bh(&idev
->lock
);
1738 EXPORT_SYMBOL(ipv6_chk_prefix
);
1740 struct inet6_ifaddr
*ipv6_get_ifaddr(struct net
*net
, const struct in6_addr
*addr
,
1741 struct net_device
*dev
, int strict
)
1743 struct inet6_ifaddr
*ifp
, *result
= NULL
;
1744 unsigned int hash
= inet6_addr_hash(addr
);
1747 hlist_for_each_entry_rcu_bh(ifp
, &inet6_addr_lst
[hash
], addr_lst
) {
1748 if (!net_eq(dev_net(ifp
->idev
->dev
), net
))
1750 if (ipv6_addr_equal(&ifp
->addr
, addr
)) {
1751 if (!dev
|| ifp
->idev
->dev
== dev
||
1752 !(ifp
->scope
&(IFA_LINK
|IFA_HOST
) || strict
)) {
1759 rcu_read_unlock_bh();
1764 /* Gets referenced address, destroys ifaddr */
1766 static void addrconf_dad_stop(struct inet6_ifaddr
*ifp
, int dad_failed
)
1768 if (ifp
->flags
&IFA_F_PERMANENT
) {
1769 spin_lock_bh(&ifp
->lock
);
1770 addrconf_del_dad_work(ifp
);
1771 ifp
->flags
|= IFA_F_TENTATIVE
;
1773 ifp
->flags
|= IFA_F_DADFAILED
;
1774 spin_unlock_bh(&ifp
->lock
);
1776 ipv6_ifa_notify(0, ifp
);
1778 } else if (ifp
->flags
&IFA_F_TEMPORARY
) {
1779 struct inet6_ifaddr
*ifpub
;
1780 spin_lock_bh(&ifp
->lock
);
1783 in6_ifa_hold(ifpub
);
1784 spin_unlock_bh(&ifp
->lock
);
1785 ipv6_create_tempaddr(ifpub
, ifp
);
1788 spin_unlock_bh(&ifp
->lock
);
1796 static int addrconf_dad_end(struct inet6_ifaddr
*ifp
)
1800 spin_lock_bh(&ifp
->lock
);
1801 if (ifp
->state
== INET6_IFADDR_STATE_DAD
) {
1802 ifp
->state
= INET6_IFADDR_STATE_POSTDAD
;
1805 spin_unlock_bh(&ifp
->lock
);
1810 void addrconf_dad_failure(struct inet6_ifaddr
*ifp
)
1812 struct in6_addr addr
;
1813 struct inet6_dev
*idev
= ifp
->idev
;
1814 struct net
*net
= dev_net(ifp
->idev
->dev
);
1816 if (addrconf_dad_end(ifp
)) {
1821 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1822 ifp
->idev
->dev
->name
, &ifp
->addr
);
1824 spin_lock_bh(&ifp
->lock
);
1826 if (ifp
->flags
& IFA_F_STABLE_PRIVACY
) {
1827 int scope
= ifp
->scope
;
1828 u32 flags
= ifp
->flags
;
1829 struct in6_addr new_addr
;
1830 struct inet6_ifaddr
*ifp2
;
1831 u32 valid_lft
, preferred_lft
;
1832 int pfxlen
= ifp
->prefix_len
;
1833 int retries
= ifp
->stable_privacy_retry
+ 1;
1835 if (retries
> net
->ipv6
.sysctl
.idgen_retries
) {
1836 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1837 ifp
->idev
->dev
->name
);
1841 new_addr
= ifp
->addr
;
1842 if (ipv6_generate_stable_address(&new_addr
, retries
,
1846 valid_lft
= ifp
->valid_lft
;
1847 preferred_lft
= ifp
->prefered_lft
;
1849 spin_unlock_bh(&ifp
->lock
);
1851 if (idev
->cnf
.max_addresses
&&
1852 ipv6_count_addresses(idev
) >=
1853 idev
->cnf
.max_addresses
)
1856 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1857 ifp
->idev
->dev
->name
);
1859 ifp2
= ipv6_add_addr(idev
, &new_addr
, NULL
, pfxlen
,
1860 scope
, flags
, valid_lft
,
1865 spin_lock_bh(&ifp2
->lock
);
1866 ifp2
->stable_privacy_retry
= retries
;
1867 ifp2
->state
= INET6_IFADDR_STATE_PREDAD
;
1868 spin_unlock_bh(&ifp2
->lock
);
1870 addrconf_mod_dad_work(ifp2
, net
->ipv6
.sysctl
.idgen_delay
);
1873 spin_lock_bh(&ifp
->lock
);
1874 } else if (idev
->cnf
.accept_dad
> 1 && !idev
->cnf
.disable_ipv6
) {
1875 addr
.s6_addr32
[0] = htonl(0xfe800000);
1876 addr
.s6_addr32
[1] = 0;
1878 if (!ipv6_generate_eui64(addr
.s6_addr
+ 8, idev
->dev
) &&
1879 ipv6_addr_equal(&ifp
->addr
, &addr
)) {
1880 /* DAD failed for link-local based on MAC address */
1881 idev
->cnf
.disable_ipv6
= 1;
1883 pr_info("%s: IPv6 being disabled!\n",
1884 ifp
->idev
->dev
->name
);
1889 /* transition from _POSTDAD to _ERRDAD */
1890 ifp
->state
= INET6_IFADDR_STATE_ERRDAD
;
1891 spin_unlock_bh(&ifp
->lock
);
1893 addrconf_mod_dad_work(ifp
, 0);
1896 /* Join to solicited addr multicast group.
1897 * caller must hold RTNL */
1898 void addrconf_join_solict(struct net_device
*dev
, const struct in6_addr
*addr
)
1900 struct in6_addr maddr
;
1902 if (dev
->flags
&(IFF_LOOPBACK
|IFF_NOARP
))
1905 addrconf_addr_solict_mult(addr
, &maddr
);
1906 ipv6_dev_mc_inc(dev
, &maddr
);
1909 /* caller must hold RTNL */
1910 void addrconf_leave_solict(struct inet6_dev
*idev
, const struct in6_addr
*addr
)
1912 struct in6_addr maddr
;
1914 if (idev
->dev
->flags
&(IFF_LOOPBACK
|IFF_NOARP
))
1917 addrconf_addr_solict_mult(addr
, &maddr
);
1918 __ipv6_dev_mc_dec(idev
, &maddr
);
1921 /* caller must hold RTNL */
1922 static void addrconf_join_anycast(struct inet6_ifaddr
*ifp
)
1924 struct in6_addr addr
;
1926 if (ifp
->prefix_len
>= 127) /* RFC 6164 */
1928 ipv6_addr_prefix(&addr
, &ifp
->addr
, ifp
->prefix_len
);
1929 if (ipv6_addr_any(&addr
))
1931 __ipv6_dev_ac_inc(ifp
->idev
, &addr
);
1934 /* caller must hold RTNL */
1935 static void addrconf_leave_anycast(struct inet6_ifaddr
*ifp
)
1937 struct in6_addr addr
;
1939 if (ifp
->prefix_len
>= 127) /* RFC 6164 */
1941 ipv6_addr_prefix(&addr
, &ifp
->addr
, ifp
->prefix_len
);
1942 if (ipv6_addr_any(&addr
))
1944 __ipv6_dev_ac_dec(ifp
->idev
, &addr
);
1947 static int addrconf_ifid_eui64(u8
*eui
, struct net_device
*dev
)
1949 if (dev
->addr_len
!= IEEE802154_ADDR_LEN
)
1951 memcpy(eui
, dev
->dev_addr
, 8);
1956 static int addrconf_ifid_ieee1394(u8
*eui
, struct net_device
*dev
)
1958 union fwnet_hwaddr
*ha
;
1960 if (dev
->addr_len
!= FWNET_ALEN
)
1963 ha
= (union fwnet_hwaddr
*)dev
->dev_addr
;
1965 memcpy(eui
, &ha
->uc
.uniq_id
, sizeof(ha
->uc
.uniq_id
));
1970 static int addrconf_ifid_arcnet(u8
*eui
, struct net_device
*dev
)
1972 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1973 if (dev
->addr_len
!= ARCNET_ALEN
)
1976 eui
[7] = *(u8
*)dev
->dev_addr
;
1980 static int addrconf_ifid_infiniband(u8
*eui
, struct net_device
*dev
)
1982 if (dev
->addr_len
!= INFINIBAND_ALEN
)
1984 memcpy(eui
, dev
->dev_addr
+ 12, 8);
1989 static int __ipv6_isatap_ifid(u8
*eui
, __be32 addr
)
1993 eui
[0] = (ipv4_is_zeronet(addr
) || ipv4_is_private_10(addr
) ||
1994 ipv4_is_loopback(addr
) || ipv4_is_linklocal_169(addr
) ||
1995 ipv4_is_private_172(addr
) || ipv4_is_test_192(addr
) ||
1996 ipv4_is_anycast_6to4(addr
) || ipv4_is_private_192(addr
) ||
1997 ipv4_is_test_198(addr
) || ipv4_is_multicast(addr
) ||
1998 ipv4_is_lbcast(addr
)) ? 0x00 : 0x02;
2002 memcpy(eui
+ 4, &addr
, 4);
2006 static int addrconf_ifid_sit(u8
*eui
, struct net_device
*dev
)
2008 if (dev
->priv_flags
& IFF_ISATAP
)
2009 return __ipv6_isatap_ifid(eui
, *(__be32
*)dev
->dev_addr
);
2013 static int addrconf_ifid_gre(u8
*eui
, struct net_device
*dev
)
2015 return __ipv6_isatap_ifid(eui
, *(__be32
*)dev
->dev_addr
);
2018 static int addrconf_ifid_ip6tnl(u8
*eui
, struct net_device
*dev
)
2020 memcpy(eui
, dev
->perm_addr
, 3);
2021 memcpy(eui
+ 5, dev
->perm_addr
+ 3, 3);
2028 static int ipv6_generate_eui64(u8
*eui
, struct net_device
*dev
)
2030 switch (dev
->type
) {
2033 return addrconf_ifid_eui48(eui
, dev
);
2035 return addrconf_ifid_arcnet(eui
, dev
);
2036 case ARPHRD_INFINIBAND
:
2037 return addrconf_ifid_infiniband(eui
, dev
);
2039 return addrconf_ifid_sit(eui
, dev
);
2041 return addrconf_ifid_gre(eui
, dev
);
2042 case ARPHRD_6LOWPAN
:
2043 case ARPHRD_IEEE802154
:
2044 return addrconf_ifid_eui64(eui
, dev
);
2045 case ARPHRD_IEEE1394
:
2046 return addrconf_ifid_ieee1394(eui
, dev
);
2047 case ARPHRD_TUNNEL6
:
2048 return addrconf_ifid_ip6tnl(eui
, dev
);
2053 static int ipv6_inherit_eui64(u8
*eui
, struct inet6_dev
*idev
)
2056 struct inet6_ifaddr
*ifp
;
2058 read_lock_bh(&idev
->lock
);
2059 list_for_each_entry_reverse(ifp
, &idev
->addr_list
, if_list
) {
2060 if (ifp
->scope
> IFA_LINK
)
2062 if (ifp
->scope
== IFA_LINK
&& !(ifp
->flags
&IFA_F_TENTATIVE
)) {
2063 memcpy(eui
, ifp
->addr
.s6_addr
+8, 8);
2068 read_unlock_bh(&idev
->lock
);
2072 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2073 static void __ipv6_regen_rndid(struct inet6_dev
*idev
)
2076 get_random_bytes(idev
->rndid
, sizeof(idev
->rndid
));
2077 idev
->rndid
[0] &= ~0x02;
2080 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2081 * check if generated address is not inappropriate
2083 * - Reserved subnet anycast (RFC 2526)
2084 * 11111101 11....11 1xxxxxxx
2085 * - ISATAP (RFC4214) 6.1
2086 * 00-00-5E-FE-xx-xx-xx-xx
2088 * - XXX: already assigned to an address on the device
2090 if (idev
->rndid
[0] == 0xfd &&
2091 (idev
->rndid
[1]&idev
->rndid
[2]&idev
->rndid
[3]&idev
->rndid
[4]&idev
->rndid
[5]&idev
->rndid
[6]) == 0xff &&
2092 (idev
->rndid
[7]&0x80))
2094 if ((idev
->rndid
[0]|idev
->rndid
[1]) == 0) {
2095 if (idev
->rndid
[2] == 0x5e && idev
->rndid
[3] == 0xfe)
2097 if ((idev
->rndid
[2]|idev
->rndid
[3]|idev
->rndid
[4]|idev
->rndid
[5]|idev
->rndid
[6]|idev
->rndid
[7]) == 0x00)
2102 static void ipv6_regen_rndid(unsigned long data
)
2104 struct inet6_dev
*idev
= (struct inet6_dev
*) data
;
2105 unsigned long expires
;
2108 write_lock_bh(&idev
->lock
);
2113 __ipv6_regen_rndid(idev
);
2116 idev
->cnf
.temp_prefered_lft
* HZ
-
2117 idev
->cnf
.regen_max_retry
* idev
->cnf
.dad_transmits
*
2118 NEIGH_VAR(idev
->nd_parms
, RETRANS_TIME
) -
2119 idev
->cnf
.max_desync_factor
* HZ
;
2120 if (time_before(expires
, jiffies
)) {
2121 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2122 __func__
, idev
->dev
->name
);
2126 if (!mod_timer(&idev
->regen_timer
, expires
))
2130 write_unlock_bh(&idev
->lock
);
2131 rcu_read_unlock_bh();
2135 static void __ipv6_try_regen_rndid(struct inet6_dev
*idev
, struct in6_addr
*tmpaddr
)
2137 if (tmpaddr
&& memcmp(idev
->rndid
, &tmpaddr
->s6_addr
[8], 8) == 0)
2138 __ipv6_regen_rndid(idev
);
2146 addrconf_prefix_route(struct in6_addr
*pfx
, int plen
, struct net_device
*dev
,
2147 unsigned long expires
, u32 flags
)
2149 struct fib6_config cfg
= {
2150 .fc_table
= l3mdev_fib_table(dev
) ? : RT6_TABLE_PREFIX
,
2151 .fc_metric
= IP6_RT_PRIO_ADDRCONF
,
2152 .fc_ifindex
= dev
->ifindex
,
2153 .fc_expires
= expires
,
2155 .fc_flags
= RTF_UP
| flags
,
2156 .fc_nlinfo
.nl_net
= dev_net(dev
),
2157 .fc_protocol
= RTPROT_KERNEL
,
2162 /* Prevent useless cloning on PtP SIT.
2163 This thing is done here expecting that the whole
2164 class of non-broadcast devices need not cloning.
2166 #if IS_ENABLED(CONFIG_IPV6_SIT)
2167 if (dev
->type
== ARPHRD_SIT
&& (dev
->flags
& IFF_POINTOPOINT
))
2168 cfg
.fc_flags
|= RTF_NONEXTHOP
;
2171 ip6_route_add(&cfg
);
2175 static struct rt6_info
*addrconf_get_prefix_route(const struct in6_addr
*pfx
,
2177 const struct net_device
*dev
,
2178 u32 flags
, u32 noflags
)
2180 struct fib6_node
*fn
;
2181 struct rt6_info
*rt
= NULL
;
2182 struct fib6_table
*table
;
2183 u32 tb_id
= l3mdev_fib_table(dev
) ? : RT6_TABLE_PREFIX
;
2185 table
= fib6_get_table(dev_net(dev
), tb_id
);
2189 read_lock_bh(&table
->tb6_lock
);
2190 fn
= fib6_locate(&table
->tb6_root
, pfx
, plen
, NULL
, 0);
2194 noflags
|= RTF_CACHE
;
2195 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
2196 if (rt
->dst
.dev
->ifindex
!= dev
->ifindex
)
2198 if ((rt
->rt6i_flags
& flags
) != flags
)
2200 if ((rt
->rt6i_flags
& noflags
) != 0)
2206 read_unlock_bh(&table
->tb6_lock
);
2211 /* Create "default" multicast route to the interface */
2213 static void addrconf_add_mroute(struct net_device
*dev
)
2215 struct fib6_config cfg
= {
2216 .fc_table
= l3mdev_fib_table(dev
) ? : RT6_TABLE_LOCAL
,
2217 .fc_metric
= IP6_RT_PRIO_ADDRCONF
,
2218 .fc_ifindex
= dev
->ifindex
,
2221 .fc_nlinfo
.nl_net
= dev_net(dev
),
2224 ipv6_addr_set(&cfg
.fc_dst
, htonl(0xFF000000), 0, 0, 0);
2226 ip6_route_add(&cfg
);
2229 static struct inet6_dev
*addrconf_add_dev(struct net_device
*dev
)
2231 struct inet6_dev
*idev
;
2235 idev
= ipv6_find_idev(dev
);
2237 return ERR_PTR(-ENOBUFS
);
2239 if (idev
->cnf
.disable_ipv6
)
2240 return ERR_PTR(-EACCES
);
2242 /* Add default multicast route */
2243 if (!(dev
->flags
& IFF_LOOPBACK
))
2244 addrconf_add_mroute(dev
);
2249 static void manage_tempaddrs(struct inet6_dev
*idev
,
2250 struct inet6_ifaddr
*ifp
,
2251 __u32 valid_lft
, __u32 prefered_lft
,
2252 bool create
, unsigned long now
)
2255 struct inet6_ifaddr
*ift
;
2257 read_lock_bh(&idev
->lock
);
2258 /* update all temporary addresses in the list */
2259 list_for_each_entry(ift
, &idev
->tempaddr_list
, tmp_list
) {
2260 int age
, max_valid
, max_prefered
;
2262 if (ifp
!= ift
->ifpub
)
2265 /* RFC 4941 section 3.3:
2266 * If a received option will extend the lifetime of a public
2267 * address, the lifetimes of temporary addresses should
2268 * be extended, subject to the overall constraint that no
2269 * temporary addresses should ever remain "valid" or "preferred"
2270 * for a time longer than (TEMP_VALID_LIFETIME) or
2271 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2273 age
= (now
- ift
->cstamp
) / HZ
;
2274 max_valid
= idev
->cnf
.temp_valid_lft
- age
;
2278 max_prefered
= idev
->cnf
.temp_prefered_lft
-
2279 idev
->cnf
.max_desync_factor
- age
;
2280 if (max_prefered
< 0)
2283 if (valid_lft
> max_valid
)
2284 valid_lft
= max_valid
;
2286 if (prefered_lft
> max_prefered
)
2287 prefered_lft
= max_prefered
;
2289 spin_lock(&ift
->lock
);
2291 ift
->valid_lft
= valid_lft
;
2292 ift
->prefered_lft
= prefered_lft
;
2294 if (prefered_lft
> 0)
2295 ift
->flags
&= ~IFA_F_DEPRECATED
;
2297 spin_unlock(&ift
->lock
);
2298 if (!(flags
&IFA_F_TENTATIVE
))
2299 ipv6_ifa_notify(0, ift
);
2302 if ((create
|| list_empty(&idev
->tempaddr_list
)) &&
2303 idev
->cnf
.use_tempaddr
> 0) {
2304 /* When a new public address is created as described
2305 * in [ADDRCONF], also create a new temporary address.
2306 * Also create a temporary address if it's enabled but
2307 * no temporary address currently exists.
2309 read_unlock_bh(&idev
->lock
);
2310 ipv6_create_tempaddr(ifp
, NULL
);
2312 read_unlock_bh(&idev
->lock
);
2316 void addrconf_prefix_rcv(struct net_device
*dev
, u8
*opt
, int len
, bool sllao
)
2318 struct prefix_info
*pinfo
;
2323 struct inet6_dev
*in6_dev
;
2324 struct net
*net
= dev_net(dev
);
2326 pinfo
= (struct prefix_info
*) opt
;
2328 if (len
< sizeof(struct prefix_info
)) {
2329 ADBG("addrconf: prefix option too short\n");
2334 * Validation checks ([ADDRCONF], page 19)
2337 addr_type
= ipv6_addr_type(&pinfo
->prefix
);
2339 if (addr_type
& (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
))
2342 valid_lft
= ntohl(pinfo
->valid
);
2343 prefered_lft
= ntohl(pinfo
->prefered
);
2345 if (prefered_lft
> valid_lft
) {
2346 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2350 in6_dev
= in6_dev_get(dev
);
2353 net_dbg_ratelimited("addrconf: device %s not configured\n",
2359 * Two things going on here:
2360 * 1) Add routes for on-link prefixes
2361 * 2) Configure prefixes with the auto flag set
2364 if (pinfo
->onlink
) {
2365 struct rt6_info
*rt
;
2366 unsigned long rt_expires
;
2368 /* Avoid arithmetic overflow. Really, we could
2369 * save rt_expires in seconds, likely valid_lft,
2370 * but it would require division in fib gc, that it
2374 rt_expires
= addrconf_timeout_fixup(valid_lft
, HZ
);
2376 rt_expires
= addrconf_timeout_fixup(valid_lft
, USER_HZ
);
2378 if (addrconf_finite_timeout(rt_expires
))
2381 rt
= addrconf_get_prefix_route(&pinfo
->prefix
,
2384 RTF_ADDRCONF
| RTF_PREFIX_RT
,
2385 RTF_GATEWAY
| RTF_DEFAULT
);
2388 /* Autoconf prefix route */
2389 if (valid_lft
== 0) {
2392 } else if (addrconf_finite_timeout(rt_expires
)) {
2394 rt6_set_expires(rt
, jiffies
+ rt_expires
);
2396 rt6_clean_expires(rt
);
2398 } else if (valid_lft
) {
2399 clock_t expires
= 0;
2400 int flags
= RTF_ADDRCONF
| RTF_PREFIX_RT
;
2401 if (addrconf_finite_timeout(rt_expires
)) {
2403 flags
|= RTF_EXPIRES
;
2404 expires
= jiffies_to_clock_t(rt_expires
);
2406 addrconf_prefix_route(&pinfo
->prefix
, pinfo
->prefix_len
,
2407 dev
, expires
, flags
);
2412 /* Try to figure out our local address for this prefix */
2414 if (pinfo
->autoconf
&& in6_dev
->cnf
.autoconf
) {
2415 struct inet6_ifaddr
*ifp
;
2416 struct in6_addr addr
;
2417 int create
= 0, update_lft
= 0;
2418 bool tokenized
= false;
2420 if (pinfo
->prefix_len
== 64) {
2421 memcpy(&addr
, &pinfo
->prefix
, 8);
2423 if (!ipv6_addr_any(&in6_dev
->token
)) {
2424 read_lock_bh(&in6_dev
->lock
);
2425 memcpy(addr
.s6_addr
+ 8,
2426 in6_dev
->token
.s6_addr
+ 8, 8);
2427 read_unlock_bh(&in6_dev
->lock
);
2429 } else if (in6_dev
->addr_gen_mode
==
2430 IN6_ADDR_GEN_MODE_STABLE_PRIVACY
&&
2431 !ipv6_generate_stable_address(&addr
, 0,
2433 addr_flags
|= IFA_F_STABLE_PRIVACY
;
2435 } else if (ipv6_generate_eui64(addr
.s6_addr
+ 8, dev
) &&
2436 ipv6_inherit_eui64(addr
.s6_addr
+ 8, in6_dev
)) {
2437 in6_dev_put(in6_dev
);
2442 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2444 in6_dev_put(in6_dev
);
2449 ifp
= ipv6_get_ifaddr(net
, &addr
, dev
, 1);
2451 if (!ifp
&& valid_lft
) {
2452 int max_addresses
= in6_dev
->cnf
.max_addresses
;
2454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2455 if (in6_dev
->cnf
.optimistic_dad
&&
2456 !net
->ipv6
.devconf_all
->forwarding
&& sllao
)
2457 addr_flags
= IFA_F_OPTIMISTIC
;
2460 /* Do not allow to create too much of autoconfigured
2461 * addresses; this would be too easy way to crash kernel.
2463 if (!max_addresses
||
2464 ipv6_count_addresses(in6_dev
) < max_addresses
)
2465 ifp
= ipv6_add_addr(in6_dev
, &addr
, NULL
,
2467 addr_type
&IPV6_ADDR_SCOPE_MASK
,
2468 addr_flags
, valid_lft
,
2471 if (IS_ERR_OR_NULL(ifp
)) {
2472 in6_dev_put(in6_dev
);
2478 spin_lock_bh(&ifp
->lock
);
2479 ifp
->flags
|= IFA_F_MANAGETEMPADDR
;
2480 ifp
->cstamp
= jiffies
;
2481 ifp
->tokenized
= tokenized
;
2482 spin_unlock_bh(&ifp
->lock
);
2483 addrconf_dad_start(ifp
);
2491 /* update lifetime (RFC2462 5.5.3 e) */
2492 spin_lock_bh(&ifp
->lock
);
2494 if (ifp
->valid_lft
> (now
- ifp
->tstamp
) / HZ
)
2495 stored_lft
= ifp
->valid_lft
- (now
- ifp
->tstamp
) / HZ
;
2498 if (!update_lft
&& !create
&& stored_lft
) {
2499 const u32 minimum_lft
= min_t(u32
,
2500 stored_lft
, MIN_VALID_LIFETIME
);
2501 valid_lft
= max(valid_lft
, minimum_lft
);
2503 /* RFC4862 Section 5.5.3e:
2504 * "Note that the preferred lifetime of the
2505 * corresponding address is always reset to
2506 * the Preferred Lifetime in the received
2507 * Prefix Information option, regardless of
2508 * whether the valid lifetime is also reset or
2511 * So we should always update prefered_lft here.
2517 ifp
->valid_lft
= valid_lft
;
2518 ifp
->prefered_lft
= prefered_lft
;
2521 ifp
->flags
&= ~IFA_F_DEPRECATED
;
2522 spin_unlock_bh(&ifp
->lock
);
2524 if (!(flags
&IFA_F_TENTATIVE
))
2525 ipv6_ifa_notify(0, ifp
);
2527 spin_unlock_bh(&ifp
->lock
);
2529 manage_tempaddrs(in6_dev
, ifp
, valid_lft
, prefered_lft
,
2536 inet6_prefix_notify(RTM_NEWPREFIX
, in6_dev
, pinfo
);
2537 in6_dev_put(in6_dev
);
2541 * Set destination address.
2542 * Special case for SIT interfaces where we create a new "virtual"
2545 int addrconf_set_dstaddr(struct net
*net
, void __user
*arg
)
2547 struct in6_ifreq ireq
;
2548 struct net_device
*dev
;
2554 if (copy_from_user(&ireq
, arg
, sizeof(struct in6_ifreq
)))
2557 dev
= __dev_get_by_index(net
, ireq
.ifr6_ifindex
);
2563 #if IS_ENABLED(CONFIG_IPV6_SIT)
2564 if (dev
->type
== ARPHRD_SIT
) {
2565 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2567 struct ip_tunnel_parm p
;
2569 err
= -EADDRNOTAVAIL
;
2570 if (!(ipv6_addr_type(&ireq
.ifr6_addr
) & IPV6_ADDR_COMPATv4
))
2573 memset(&p
, 0, sizeof(p
));
2574 p
.iph
.daddr
= ireq
.ifr6_addr
.s6_addr32
[3];
2578 p
.iph
.protocol
= IPPROTO_IPV6
;
2580 ifr
.ifr_ifru
.ifru_data
= (__force
void __user
*)&p
;
2582 if (ops
->ndo_do_ioctl
) {
2583 mm_segment_t oldfs
= get_fs();
2586 err
= ops
->ndo_do_ioctl(dev
, &ifr
, SIOCADDTUNNEL
);
2593 dev
= __dev_get_by_name(net
, p
.name
);
2596 err
= dev_open(dev
);
2606 static int ipv6_mc_config(struct sock
*sk
, bool join
,
2607 const struct in6_addr
*addr
, int ifindex
)
2615 ret
= ipv6_sock_mc_join(sk
, ifindex
, addr
);
2617 ret
= ipv6_sock_mc_drop(sk
, ifindex
, addr
);
2624 * Manual configuration of address on an interface
2626 static int inet6_addr_add(struct net
*net
, int ifindex
,
2627 const struct in6_addr
*pfx
,
2628 const struct in6_addr
*peer_pfx
,
2629 unsigned int plen
, __u32 ifa_flags
,
2630 __u32 prefered_lft
, __u32 valid_lft
)
2632 struct inet6_ifaddr
*ifp
;
2633 struct inet6_dev
*idev
;
2634 struct net_device
*dev
;
2635 unsigned long timeout
;
2645 /* check the lifetime */
2646 if (!valid_lft
|| prefered_lft
> valid_lft
)
2649 if (ifa_flags
& IFA_F_MANAGETEMPADDR
&& plen
!= 64)
2652 dev
= __dev_get_by_index(net
, ifindex
);
2656 idev
= addrconf_add_dev(dev
);
2658 return PTR_ERR(idev
);
2660 if (ifa_flags
& IFA_F_MCAUTOJOIN
) {
2661 int ret
= ipv6_mc_config(net
->ipv6
.mc_autojoin_sk
,
2662 true, pfx
, ifindex
);
2668 scope
= ipv6_addr_scope(pfx
);
2670 timeout
= addrconf_timeout_fixup(valid_lft
, HZ
);
2671 if (addrconf_finite_timeout(timeout
)) {
2672 expires
= jiffies_to_clock_t(timeout
* HZ
);
2673 valid_lft
= timeout
;
2674 flags
= RTF_EXPIRES
;
2678 ifa_flags
|= IFA_F_PERMANENT
;
2681 timeout
= addrconf_timeout_fixup(prefered_lft
, HZ
);
2682 if (addrconf_finite_timeout(timeout
)) {
2684 ifa_flags
|= IFA_F_DEPRECATED
;
2685 prefered_lft
= timeout
;
2688 ifp
= ipv6_add_addr(idev
, pfx
, peer_pfx
, plen
, scope
, ifa_flags
,
2689 valid_lft
, prefered_lft
);
2692 if (!(ifa_flags
& IFA_F_NOPREFIXROUTE
)) {
2693 addrconf_prefix_route(&ifp
->addr
, ifp
->prefix_len
, dev
,
2698 * Note that section 3.1 of RFC 4429 indicates
2699 * that the Optimistic flag should not be set for
2700 * manually configured addresses
2702 addrconf_dad_start(ifp
);
2703 if (ifa_flags
& IFA_F_MANAGETEMPADDR
)
2704 manage_tempaddrs(idev
, ifp
, valid_lft
, prefered_lft
,
2707 addrconf_verify_rtnl();
2709 } else if (ifa_flags
& IFA_F_MCAUTOJOIN
) {
2710 ipv6_mc_config(net
->ipv6
.mc_autojoin_sk
,
2711 false, pfx
, ifindex
);
2714 return PTR_ERR(ifp
);
2717 static int inet6_addr_del(struct net
*net
, int ifindex
, u32 ifa_flags
,
2718 const struct in6_addr
*pfx
, unsigned int plen
)
2720 struct inet6_ifaddr
*ifp
;
2721 struct inet6_dev
*idev
;
2722 struct net_device
*dev
;
2727 dev
= __dev_get_by_index(net
, ifindex
);
2731 idev
= __in6_dev_get(dev
);
2735 read_lock_bh(&idev
->lock
);
2736 list_for_each_entry(ifp
, &idev
->addr_list
, if_list
) {
2737 if (ifp
->prefix_len
== plen
&&
2738 ipv6_addr_equal(pfx
, &ifp
->addr
)) {
2740 read_unlock_bh(&idev
->lock
);
2742 if (!(ifp
->flags
& IFA_F_TEMPORARY
) &&
2743 (ifa_flags
& IFA_F_MANAGETEMPADDR
))
2744 manage_tempaddrs(idev
, ifp
, 0, 0, false,
2747 addrconf_verify_rtnl();
2748 if (ipv6_addr_is_multicast(pfx
)) {
2749 ipv6_mc_config(net
->ipv6
.mc_autojoin_sk
,
2750 false, pfx
, dev
->ifindex
);
2755 read_unlock_bh(&idev
->lock
);
2756 return -EADDRNOTAVAIL
;
2760 int addrconf_add_ifaddr(struct net
*net
, void __user
*arg
)
2762 struct in6_ifreq ireq
;
2765 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
2768 if (copy_from_user(&ireq
, arg
, sizeof(struct in6_ifreq
)))
2772 err
= inet6_addr_add(net
, ireq
.ifr6_ifindex
, &ireq
.ifr6_addr
, NULL
,
2773 ireq
.ifr6_prefixlen
, IFA_F_PERMANENT
,
2774 INFINITY_LIFE_TIME
, INFINITY_LIFE_TIME
);
2779 int addrconf_del_ifaddr(struct net
*net
, void __user
*arg
)
2781 struct in6_ifreq ireq
;
2784 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
2787 if (copy_from_user(&ireq
, arg
, sizeof(struct in6_ifreq
)))
2791 err
= inet6_addr_del(net
, ireq
.ifr6_ifindex
, 0, &ireq
.ifr6_addr
,
2792 ireq
.ifr6_prefixlen
);
2797 static void add_addr(struct inet6_dev
*idev
, const struct in6_addr
*addr
,
2798 int plen
, int scope
)
2800 struct inet6_ifaddr
*ifp
;
2802 ifp
= ipv6_add_addr(idev
, addr
, NULL
, plen
,
2803 scope
, IFA_F_PERMANENT
,
2804 INFINITY_LIFE_TIME
, INFINITY_LIFE_TIME
);
2806 spin_lock_bh(&ifp
->lock
);
2807 ifp
->flags
&= ~IFA_F_TENTATIVE
;
2808 spin_unlock_bh(&ifp
->lock
);
2809 ipv6_ifa_notify(RTM_NEWADDR
, ifp
);
2814 #if IS_ENABLED(CONFIG_IPV6_SIT)
2815 static void sit_add_v4_addrs(struct inet6_dev
*idev
)
2817 struct in6_addr addr
;
2818 struct net_device
*dev
;
2819 struct net
*net
= dev_net(idev
->dev
);
2825 memset(&addr
, 0, sizeof(struct in6_addr
));
2826 memcpy(&addr
.s6_addr32
[3], idev
->dev
->dev_addr
, 4);
2828 if (idev
->dev
->flags
&IFF_POINTOPOINT
) {
2829 addr
.s6_addr32
[0] = htonl(0xfe800000);
2833 scope
= IPV6_ADDR_COMPATv4
;
2835 pflags
|= RTF_NONEXTHOP
;
2838 if (addr
.s6_addr32
[3]) {
2839 add_addr(idev
, &addr
, plen
, scope
);
2840 addrconf_prefix_route(&addr
, plen
, idev
->dev
, 0, pflags
);
2844 for_each_netdev(net
, dev
) {
2845 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
2846 if (in_dev
&& (dev
->flags
& IFF_UP
)) {
2847 struct in_ifaddr
*ifa
;
2851 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
2853 addr
.s6_addr32
[3] = ifa
->ifa_local
;
2855 if (ifa
->ifa_scope
== RT_SCOPE_LINK
)
2857 if (ifa
->ifa_scope
>= RT_SCOPE_HOST
) {
2858 if (idev
->dev
->flags
&IFF_POINTOPOINT
)
2863 add_addr(idev
, &addr
, plen
, flag
);
2864 addrconf_prefix_route(&addr
, plen
, idev
->dev
, 0,
2872 static void init_loopback(struct net_device
*dev
)
2874 struct inet6_dev
*idev
;
2875 struct net_device
*sp_dev
;
2876 struct inet6_ifaddr
*sp_ifa
;
2877 struct rt6_info
*sp_rt
;
2883 idev
= ipv6_find_idev(dev
);
2885 pr_debug("%s: add_dev failed\n", __func__
);
2889 add_addr(idev
, &in6addr_loopback
, 128, IFA_HOST
);
2891 /* Add routes to other interface's IPv6 addresses */
2892 for_each_netdev(dev_net(dev
), sp_dev
) {
2893 if (!strcmp(sp_dev
->name
, dev
->name
))
2896 idev
= __in6_dev_get(sp_dev
);
2900 read_lock_bh(&idev
->lock
);
2901 list_for_each_entry(sp_ifa
, &idev
->addr_list
, if_list
) {
2903 if (sp_ifa
->flags
& (IFA_F_DADFAILED
| IFA_F_TENTATIVE
))
2907 /* This dst has been added to garbage list when
2908 * lo device down, release this obsolete dst and
2909 * reallocate a new router for ifa.
2911 if (sp_ifa
->rt
->dst
.obsolete
> 0) {
2912 ip6_rt_put(sp_ifa
->rt
);
2919 sp_rt
= addrconf_dst_alloc(idev
, &sp_ifa
->addr
, false);
2921 /* Failure cases are ignored */
2922 if (!IS_ERR(sp_rt
)) {
2927 read_unlock_bh(&idev
->lock
);
2931 static void addrconf_add_linklocal(struct inet6_dev
*idev
,
2932 const struct in6_addr
*addr
, u32 flags
)
2934 struct inet6_ifaddr
*ifp
;
2935 u32 addr_flags
= flags
| IFA_F_PERMANENT
;
2937 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2938 if (idev
->cnf
.optimistic_dad
&&
2939 !dev_net(idev
->dev
)->ipv6
.devconf_all
->forwarding
)
2940 addr_flags
|= IFA_F_OPTIMISTIC
;
2943 ifp
= ipv6_add_addr(idev
, addr
, NULL
, 64, IFA_LINK
, addr_flags
,
2944 INFINITY_LIFE_TIME
, INFINITY_LIFE_TIME
);
2946 addrconf_prefix_route(&ifp
->addr
, ifp
->prefix_len
, idev
->dev
, 0, 0);
2947 addrconf_dad_start(ifp
);
2952 static bool ipv6_reserved_interfaceid(struct in6_addr address
)
2954 if ((address
.s6_addr32
[2] | address
.s6_addr32
[3]) == 0)
2957 if (address
.s6_addr32
[2] == htonl(0x02005eff) &&
2958 ((address
.s6_addr32
[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2961 if (address
.s6_addr32
[2] == htonl(0xfdffffff) &&
2962 ((address
.s6_addr32
[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2968 static int ipv6_generate_stable_address(struct in6_addr
*address
,
2970 const struct inet6_dev
*idev
)
2972 static DEFINE_SPINLOCK(lock
);
2973 static __u32 digest
[SHA_DIGEST_WORDS
];
2974 static __u32 workspace
[SHA_WORKSPACE_WORDS
];
2977 char __data
[SHA_MESSAGE_BYTES
];
2979 struct in6_addr secret
;
2981 unsigned char hwaddr
[MAX_ADDR_LEN
];
2986 struct in6_addr secret
;
2987 struct in6_addr temp
;
2988 struct net
*net
= dev_net(idev
->dev
);
2990 BUILD_BUG_ON(sizeof(data
.__data
) != sizeof(data
));
2992 if (idev
->cnf
.stable_secret
.initialized
)
2993 secret
= idev
->cnf
.stable_secret
.secret
;
2994 else if (net
->ipv6
.devconf_dflt
->stable_secret
.initialized
)
2995 secret
= net
->ipv6
.devconf_dflt
->stable_secret
.secret
;
3000 spin_lock_bh(&lock
);
3003 memset(&data
, 0, sizeof(data
));
3004 memset(workspace
, 0, sizeof(workspace
));
3005 memcpy(data
.hwaddr
, idev
->dev
->perm_addr
, idev
->dev
->addr_len
);
3006 data
.prefix
[0] = address
->s6_addr32
[0];
3007 data
.prefix
[1] = address
->s6_addr32
[1];
3008 data
.secret
= secret
;
3009 data
.dad_count
= dad_count
;
3011 sha_transform(digest
, data
.__data
, workspace
);
3014 temp
.s6_addr32
[2] = (__force __be32
)digest
[0];
3015 temp
.s6_addr32
[3] = (__force __be32
)digest
[1];
3017 spin_unlock_bh(&lock
);
3019 if (ipv6_reserved_interfaceid(temp
)) {
3021 if (dad_count
> dev_net(idev
->dev
)->ipv6
.sysctl
.idgen_retries
)
3030 static void addrconf_addr_gen(struct inet6_dev
*idev
, bool prefix_route
)
3032 struct in6_addr addr
;
3034 /* no link local addresses on L3 master devices */
3035 if (netif_is_l3_master(idev
->dev
))
3038 ipv6_addr_set(&addr
, htonl(0xFE800000), 0, 0, 0);
3040 if (idev
->addr_gen_mode
== IN6_ADDR_GEN_MODE_STABLE_PRIVACY
) {
3041 if (!ipv6_generate_stable_address(&addr
, 0, idev
))
3042 addrconf_add_linklocal(idev
, &addr
,
3043 IFA_F_STABLE_PRIVACY
);
3044 else if (prefix_route
)
3045 addrconf_prefix_route(&addr
, 64, idev
->dev
, 0, 0);
3046 } else if (idev
->addr_gen_mode
== IN6_ADDR_GEN_MODE_EUI64
) {
3047 /* addrconf_add_linklocal also adds a prefix_route and we
3048 * only need to care about prefix routes if ipv6_generate_eui64
3049 * couldn't generate one.
3051 if (ipv6_generate_eui64(addr
.s6_addr
+ 8, idev
->dev
) == 0)
3052 addrconf_add_linklocal(idev
, &addr
, 0);
3053 else if (prefix_route
)
3054 addrconf_prefix_route(&addr
, 64, idev
->dev
, 0, 0);
3058 static void addrconf_dev_config(struct net_device
*dev
)
3060 struct inet6_dev
*idev
;
3064 if ((dev
->type
!= ARPHRD_ETHER
) &&
3065 (dev
->type
!= ARPHRD_FDDI
) &&
3066 (dev
->type
!= ARPHRD_ARCNET
) &&
3067 (dev
->type
!= ARPHRD_INFINIBAND
) &&
3068 (dev
->type
!= ARPHRD_IEEE802154
) &&
3069 (dev
->type
!= ARPHRD_IEEE1394
) &&
3070 (dev
->type
!= ARPHRD_TUNNEL6
) &&
3071 (dev
->type
!= ARPHRD_6LOWPAN
)) {
3072 /* Alas, we support only Ethernet autoconfiguration. */
3076 idev
= addrconf_add_dev(dev
);
3080 addrconf_addr_gen(idev
, false);
3083 #if IS_ENABLED(CONFIG_IPV6_SIT)
3084 static void addrconf_sit_config(struct net_device
*dev
)
3086 struct inet6_dev
*idev
;
3091 * Configure the tunnel with one of our IPv4
3092 * addresses... we should configure all of
3093 * our v4 addrs in the tunnel
3096 idev
= ipv6_find_idev(dev
);
3098 pr_debug("%s: add_dev failed\n", __func__
);
3102 if (dev
->priv_flags
& IFF_ISATAP
) {
3103 addrconf_addr_gen(idev
, false);
3107 sit_add_v4_addrs(idev
);
3109 if (dev
->flags
&IFF_POINTOPOINT
)
3110 addrconf_add_mroute(dev
);
3114 #if IS_ENABLED(CONFIG_NET_IPGRE)
3115 static void addrconf_gre_config(struct net_device
*dev
)
3117 struct inet6_dev
*idev
;
3121 idev
= ipv6_find_idev(dev
);
3123 pr_debug("%s: add_dev failed\n", __func__
);
3127 addrconf_addr_gen(idev
, true);
3128 if (dev
->flags
& IFF_POINTOPOINT
)
3129 addrconf_add_mroute(dev
);
3133 static int addrconf_notify(struct notifier_block
*this, unsigned long event
,
3136 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3137 struct inet6_dev
*idev
= __in6_dev_get(dev
);
3138 int run_pending
= 0;
3142 case NETDEV_REGISTER
:
3143 if (!idev
&& dev
->mtu
>= IPV6_MIN_MTU
) {
3144 idev
= ipv6_add_dev(dev
);
3146 return notifier_from_errno(PTR_ERR(idev
));
3152 if (dev
->flags
& IFF_SLAVE
)
3155 if (idev
&& idev
->cnf
.disable_ipv6
)
3158 if (event
== NETDEV_UP
) {
3159 if (!addrconf_qdisc_ok(dev
)) {
3160 /* device is not ready yet. */
3161 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3166 if (!idev
&& dev
->mtu
>= IPV6_MIN_MTU
)
3167 idev
= ipv6_add_dev(dev
);
3169 if (!IS_ERR_OR_NULL(idev
)) {
3170 idev
->if_flags
|= IF_READY
;
3174 if (!addrconf_qdisc_ok(dev
)) {
3175 /* device is still not ready. */
3180 if (idev
->if_flags
& IF_READY
)
3181 /* device is already configured. */
3183 idev
->if_flags
|= IF_READY
;
3186 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3192 switch (dev
->type
) {
3193 #if IS_ENABLED(CONFIG_IPV6_SIT)
3195 addrconf_sit_config(dev
);
3198 #if IS_ENABLED(CONFIG_NET_IPGRE)
3200 addrconf_gre_config(dev
);
3203 case ARPHRD_LOOPBACK
:
3208 addrconf_dev_config(dev
);
3212 if (!IS_ERR_OR_NULL(idev
)) {
3214 addrconf_dad_run(idev
);
3217 * If the MTU changed during the interface down,
3218 * when the interface up, the changed MTU must be
3219 * reflected in the idev as well as routers.
3221 if (idev
->cnf
.mtu6
!= dev
->mtu
&&
3222 dev
->mtu
>= IPV6_MIN_MTU
) {
3223 rt6_mtu_change(dev
, dev
->mtu
);
3224 idev
->cnf
.mtu6
= dev
->mtu
;
3226 idev
->tstamp
= jiffies
;
3227 inet6_ifinfo_notify(RTM_NEWLINK
, idev
);
3230 * If the changed mtu during down is lower than
3231 * IPV6_MIN_MTU stop IPv6 on this interface.
3233 if (dev
->mtu
< IPV6_MIN_MTU
)
3234 addrconf_ifdown(dev
, 1);
3238 case NETDEV_CHANGEMTU
:
3239 if (idev
&& dev
->mtu
>= IPV6_MIN_MTU
) {
3240 rt6_mtu_change(dev
, dev
->mtu
);
3241 idev
->cnf
.mtu6
= dev
->mtu
;
3245 if (!idev
&& dev
->mtu
>= IPV6_MIN_MTU
) {
3246 idev
= ipv6_add_dev(dev
);
3252 * if MTU under IPV6_MIN_MTU.
3253 * Stop IPv6 on this interface.
3257 case NETDEV_UNREGISTER
:
3259 * Remove all addresses from this interface.
3261 addrconf_ifdown(dev
, event
!= NETDEV_DOWN
);
3264 case NETDEV_CHANGENAME
:
3266 snmp6_unregister_dev(idev
);
3267 addrconf_sysctl_unregister(idev
);
3268 err
= addrconf_sysctl_register(idev
);
3270 return notifier_from_errno(err
);
3271 err
= snmp6_register_dev(idev
);
3273 addrconf_sysctl_unregister(idev
);
3274 return notifier_from_errno(err
);
3279 case NETDEV_PRE_TYPE_CHANGE
:
3280 case NETDEV_POST_TYPE_CHANGE
:
3281 addrconf_type_change(dev
, event
);
3289 * addrconf module should be notified of a device going up
3291 static struct notifier_block ipv6_dev_notf
= {
3292 .notifier_call
= addrconf_notify
,
3295 static void addrconf_type_change(struct net_device
*dev
, unsigned long event
)
3297 struct inet6_dev
*idev
;
3300 idev
= __in6_dev_get(dev
);
3302 if (event
== NETDEV_POST_TYPE_CHANGE
)
3303 ipv6_mc_remap(idev
);
3304 else if (event
== NETDEV_PRE_TYPE_CHANGE
)
3305 ipv6_mc_unmap(idev
);
3308 static int addrconf_ifdown(struct net_device
*dev
, int how
)
3310 struct net
*net
= dev_net(dev
);
3311 struct inet6_dev
*idev
;
3312 struct inet6_ifaddr
*ifa
;
3317 rt6_ifdown(net
, dev
);
3318 neigh_ifdown(&nd_tbl
, dev
);
3320 idev
= __in6_dev_get(dev
);
3325 * Step 1: remove reference to ipv6 device from parent device.
3331 /* protected by rtnl_lock */
3332 RCU_INIT_POINTER(dev
->ip6_ptr
, NULL
);
3334 /* Step 1.5: remove snmp6 entry */
3335 snmp6_unregister_dev(idev
);
3339 /* Step 2: clear hash table */
3340 for (i
= 0; i
< IN6_ADDR_HSIZE
; i
++) {
3341 struct hlist_head
*h
= &inet6_addr_lst
[i
];
3343 spin_lock_bh(&addrconf_hash_lock
);
3345 hlist_for_each_entry_rcu(ifa
, h
, addr_lst
) {
3346 if (ifa
->idev
== idev
) {
3347 hlist_del_init_rcu(&ifa
->addr_lst
);
3348 addrconf_del_dad_work(ifa
);
3352 spin_unlock_bh(&addrconf_hash_lock
);
3355 write_lock_bh(&idev
->lock
);
3357 addrconf_del_rs_timer(idev
);
3359 /* Step 2: clear flags for stateless addrconf */
3361 idev
->if_flags
&= ~(IF_RS_SENT
|IF_RA_RCVD
|IF_READY
);
3363 if (how
&& del_timer(&idev
->regen_timer
))
3366 /* Step 3: clear tempaddr list */
3367 while (!list_empty(&idev
->tempaddr_list
)) {
3368 ifa
= list_first_entry(&idev
->tempaddr_list
,
3369 struct inet6_ifaddr
, tmp_list
);
3370 list_del(&ifa
->tmp_list
);
3371 write_unlock_bh(&idev
->lock
);
3372 spin_lock_bh(&ifa
->lock
);
3375 in6_ifa_put(ifa
->ifpub
);
3378 spin_unlock_bh(&ifa
->lock
);
3380 write_lock_bh(&idev
->lock
);
3383 while (!list_empty(&idev
->addr_list
)) {
3384 ifa
= list_first_entry(&idev
->addr_list
,
3385 struct inet6_ifaddr
, if_list
);
3386 addrconf_del_dad_work(ifa
);
3388 list_del(&ifa
->if_list
);
3390 write_unlock_bh(&idev
->lock
);
3392 spin_lock_bh(&ifa
->lock
);
3394 ifa
->state
= INET6_IFADDR_STATE_DEAD
;
3395 spin_unlock_bh(&ifa
->lock
);
3397 if (state
!= INET6_IFADDR_STATE_DEAD
) {
3398 __ipv6_ifa_notify(RTM_DELADDR
, ifa
);
3399 inet6addr_notifier_call_chain(NETDEV_DOWN
, ifa
);
3403 write_lock_bh(&idev
->lock
);
3406 write_unlock_bh(&idev
->lock
);
3408 /* Step 5: Discard anycast and multicast list */
3410 ipv6_ac_destroy_dev(idev
);
3411 ipv6_mc_destroy_dev(idev
);
3416 idev
->tstamp
= jiffies
;
3418 /* Last: Shot the device (if unregistered) */
3420 addrconf_sysctl_unregister(idev
);
3421 neigh_parms_release(&nd_tbl
, idev
->nd_parms
);
3422 neigh_ifdown(&nd_tbl
, dev
);
3428 static void addrconf_rs_timer(unsigned long data
)
3430 struct inet6_dev
*idev
= (struct inet6_dev
*)data
;
3431 struct net_device
*dev
= idev
->dev
;
3432 struct in6_addr lladdr
;
3434 write_lock(&idev
->lock
);
3435 if (idev
->dead
|| !(idev
->if_flags
& IF_READY
))
3438 if (!ipv6_accept_ra(idev
))
3441 /* Announcement received after solicitation was sent */
3442 if (idev
->if_flags
& IF_RA_RCVD
)
3445 if (idev
->rs_probes
++ < idev
->cnf
.rtr_solicits
) {
3446 write_unlock(&idev
->lock
);
3447 if (!ipv6_get_lladdr(dev
, &lladdr
, IFA_F_TENTATIVE
))
3448 ndisc_send_rs(dev
, &lladdr
,
3449 &in6addr_linklocal_allrouters
);
3453 write_lock(&idev
->lock
);
3454 /* The wait after the last probe can be shorter */
3455 addrconf_mod_rs_timer(idev
, (idev
->rs_probes
==
3456 idev
->cnf
.rtr_solicits
) ?
3457 idev
->cnf
.rtr_solicit_delay
:
3458 idev
->cnf
.rtr_solicit_interval
);
3461 * Note: we do not support deprecated "all on-link"
3462 * assumption any longer.
3464 pr_debug("%s: no IPv6 routers present\n", idev
->dev
->name
);
3468 write_unlock(&idev
->lock
);
3474 * Duplicate Address Detection
3476 static void addrconf_dad_kick(struct inet6_ifaddr
*ifp
)
3478 unsigned long rand_num
;
3479 struct inet6_dev
*idev
= ifp
->idev
;
3481 if (ifp
->flags
& IFA_F_OPTIMISTIC
)
3484 rand_num
= prandom_u32() % (idev
->cnf
.rtr_solicit_delay
? : 1);
3486 ifp
->dad_probes
= idev
->cnf
.dad_transmits
;
3487 addrconf_mod_dad_work(ifp
, rand_num
);
3490 static void addrconf_dad_begin(struct inet6_ifaddr
*ifp
)
3492 struct inet6_dev
*idev
= ifp
->idev
;
3493 struct net_device
*dev
= idev
->dev
;
3495 addrconf_join_solict(dev
, &ifp
->addr
);
3497 prandom_seed((__force u32
) ifp
->addr
.s6_addr32
[3]);
3499 read_lock_bh(&idev
->lock
);
3500 spin_lock(&ifp
->lock
);
3501 if (ifp
->state
== INET6_IFADDR_STATE_DEAD
)
3504 if (dev
->flags
&(IFF_NOARP
|IFF_LOOPBACK
) ||
3505 idev
->cnf
.accept_dad
< 1 ||
3506 !(ifp
->flags
&IFA_F_TENTATIVE
) ||
3507 ifp
->flags
& IFA_F_NODAD
) {
3508 ifp
->flags
&= ~(IFA_F_TENTATIVE
|IFA_F_OPTIMISTIC
|IFA_F_DADFAILED
);
3509 spin_unlock(&ifp
->lock
);
3510 read_unlock_bh(&idev
->lock
);
3512 addrconf_dad_completed(ifp
);
3516 if (!(idev
->if_flags
& IF_READY
)) {
3517 spin_unlock(&ifp
->lock
);
3518 read_unlock_bh(&idev
->lock
);
3520 * If the device is not ready:
3521 * - keep it tentative if it is a permanent address.
3522 * - otherwise, kill it.
3525 addrconf_dad_stop(ifp
, 0);
3530 * Optimistic nodes can start receiving
3533 if (ifp
->flags
& IFA_F_OPTIMISTIC
) {
3534 ip6_ins_rt(ifp
->rt
);
3535 if (ipv6_use_optimistic_addr(idev
)) {
3536 /* Because optimistic nodes can use this address,
3537 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3539 ipv6_ifa_notify(RTM_NEWADDR
, ifp
);
3543 addrconf_dad_kick(ifp
);
3545 spin_unlock(&ifp
->lock
);
3546 read_unlock_bh(&idev
->lock
);
3549 static void addrconf_dad_start(struct inet6_ifaddr
*ifp
)
3551 bool begin_dad
= false;
3553 spin_lock_bh(&ifp
->lock
);
3554 if (ifp
->state
!= INET6_IFADDR_STATE_DEAD
) {
3555 ifp
->state
= INET6_IFADDR_STATE_PREDAD
;
3558 spin_unlock_bh(&ifp
->lock
);
3561 addrconf_mod_dad_work(ifp
, 0);
3564 static void addrconf_dad_work(struct work_struct
*w
)
3566 struct inet6_ifaddr
*ifp
= container_of(to_delayed_work(w
),
3567 struct inet6_ifaddr
,
3569 struct inet6_dev
*idev
= ifp
->idev
;
3570 struct in6_addr mcaddr
;
3576 } action
= DAD_PROCESS
;
3580 spin_lock_bh(&ifp
->lock
);
3581 if (ifp
->state
== INET6_IFADDR_STATE_PREDAD
) {
3583 ifp
->state
= INET6_IFADDR_STATE_DAD
;
3584 } else if (ifp
->state
== INET6_IFADDR_STATE_ERRDAD
) {
3586 ifp
->state
= INET6_IFADDR_STATE_POSTDAD
;
3588 spin_unlock_bh(&ifp
->lock
);
3590 if (action
== DAD_BEGIN
) {
3591 addrconf_dad_begin(ifp
);
3593 } else if (action
== DAD_ABORT
) {
3594 addrconf_dad_stop(ifp
, 1);
3598 if (!ifp
->dad_probes
&& addrconf_dad_end(ifp
))
3601 write_lock_bh(&idev
->lock
);
3602 if (idev
->dead
|| !(idev
->if_flags
& IF_READY
)) {
3603 write_unlock_bh(&idev
->lock
);
3607 spin_lock(&ifp
->lock
);
3608 if (ifp
->state
== INET6_IFADDR_STATE_DEAD
) {
3609 spin_unlock(&ifp
->lock
);
3610 write_unlock_bh(&idev
->lock
);
3614 if (ifp
->dad_probes
== 0) {
3616 * DAD was successful
3619 ifp
->flags
&= ~(IFA_F_TENTATIVE
|IFA_F_OPTIMISTIC
|IFA_F_DADFAILED
);
3620 spin_unlock(&ifp
->lock
);
3621 write_unlock_bh(&idev
->lock
);
3623 addrconf_dad_completed(ifp
);
3629 addrconf_mod_dad_work(ifp
,
3630 NEIGH_VAR(ifp
->idev
->nd_parms
, RETRANS_TIME
));
3631 spin_unlock(&ifp
->lock
);
3632 write_unlock_bh(&idev
->lock
);
3634 /* send a neighbour solicitation for our addr */
3635 addrconf_addr_solict_mult(&ifp
->addr
, &mcaddr
);
3636 ndisc_send_ns(ifp
->idev
->dev
, &ifp
->addr
, &mcaddr
, &in6addr_any
, NULL
);
3642 /* ifp->idev must be at least read locked */
3643 static bool ipv6_lonely_lladdr(struct inet6_ifaddr
*ifp
)
3645 struct inet6_ifaddr
*ifpiter
;
3646 struct inet6_dev
*idev
= ifp
->idev
;
3648 list_for_each_entry_reverse(ifpiter
, &idev
->addr_list
, if_list
) {
3649 if (ifpiter
->scope
> IFA_LINK
)
3651 if (ifp
!= ifpiter
&& ifpiter
->scope
== IFA_LINK
&&
3652 (ifpiter
->flags
& (IFA_F_PERMANENT
|IFA_F_TENTATIVE
|
3653 IFA_F_OPTIMISTIC
|IFA_F_DADFAILED
)) ==
3660 static void addrconf_dad_completed(struct inet6_ifaddr
*ifp
)
3662 struct net_device
*dev
= ifp
->idev
->dev
;
3663 struct in6_addr lladdr
;
3664 bool send_rs
, send_mld
;
3666 addrconf_del_dad_work(ifp
);
3669 * Configure the address for reception. Now it is valid.
3672 ipv6_ifa_notify(RTM_NEWADDR
, ifp
);
3674 /* If added prefix is link local and we are prepared to process
3675 router advertisements, start sending router solicitations.
3678 read_lock_bh(&ifp
->idev
->lock
);
3679 send_mld
= ifp
->scope
== IFA_LINK
&& ipv6_lonely_lladdr(ifp
);
3680 send_rs
= send_mld
&&
3681 ipv6_accept_ra(ifp
->idev
) &&
3682 ifp
->idev
->cnf
.rtr_solicits
> 0 &&
3683 (dev
->flags
&IFF_LOOPBACK
) == 0;
3684 read_unlock_bh(&ifp
->idev
->lock
);
3686 /* While dad is in progress mld report's source address is in6_addrany.
3687 * Resend with proper ll now.
3690 ipv6_mc_dad_complete(ifp
->idev
);
3694 * If a host as already performed a random delay
3695 * [...] as part of DAD [...] there is no need
3696 * to delay again before sending the first RS
3698 if (ipv6_get_lladdr(dev
, &lladdr
, IFA_F_TENTATIVE
))
3700 ndisc_send_rs(dev
, &lladdr
, &in6addr_linklocal_allrouters
);
3702 write_lock_bh(&ifp
->idev
->lock
);
3703 spin_lock(&ifp
->lock
);
3704 ifp
->idev
->rs_probes
= 1;
3705 ifp
->idev
->if_flags
|= IF_RS_SENT
;
3706 addrconf_mod_rs_timer(ifp
->idev
,
3707 ifp
->idev
->cnf
.rtr_solicit_interval
);
3708 spin_unlock(&ifp
->lock
);
3709 write_unlock_bh(&ifp
->idev
->lock
);
3713 static void addrconf_dad_run(struct inet6_dev
*idev
)
3715 struct inet6_ifaddr
*ifp
;
3717 read_lock_bh(&idev
->lock
);
3718 list_for_each_entry(ifp
, &idev
->addr_list
, if_list
) {
3719 spin_lock(&ifp
->lock
);
3720 if (ifp
->flags
& IFA_F_TENTATIVE
&&
3721 ifp
->state
== INET6_IFADDR_STATE_DAD
)
3722 addrconf_dad_kick(ifp
);
3723 spin_unlock(&ifp
->lock
);
3725 read_unlock_bh(&idev
->lock
);
3728 #ifdef CONFIG_PROC_FS
3729 struct if6_iter_state
{
3730 struct seq_net_private p
;
3735 static struct inet6_ifaddr
*if6_get_first(struct seq_file
*seq
, loff_t pos
)
3737 struct inet6_ifaddr
*ifa
= NULL
;
3738 struct if6_iter_state
*state
= seq
->private;
3739 struct net
*net
= seq_file_net(seq
);
3742 /* initial bucket if pos is 0 */
3748 for (; state
->bucket
< IN6_ADDR_HSIZE
; ++state
->bucket
) {
3749 hlist_for_each_entry_rcu_bh(ifa
, &inet6_addr_lst
[state
->bucket
],
3751 if (!net_eq(dev_net(ifa
->idev
->dev
), net
))
3753 /* sync with offset */
3754 if (p
< state
->offset
) {
3762 /* prepare for next bucket */
3769 static struct inet6_ifaddr
*if6_get_next(struct seq_file
*seq
,
3770 struct inet6_ifaddr
*ifa
)
3772 struct if6_iter_state
*state
= seq
->private;
3773 struct net
*net
= seq_file_net(seq
);
3775 hlist_for_each_entry_continue_rcu_bh(ifa
, addr_lst
) {
3776 if (!net_eq(dev_net(ifa
->idev
->dev
), net
))
3782 while (++state
->bucket
< IN6_ADDR_HSIZE
) {
3784 hlist_for_each_entry_rcu_bh(ifa
,
3785 &inet6_addr_lst
[state
->bucket
], addr_lst
) {
3786 if (!net_eq(dev_net(ifa
->idev
->dev
), net
))
3796 static void *if6_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3800 return if6_get_first(seq
, *pos
);
3803 static void *if6_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3805 struct inet6_ifaddr
*ifa
;
3807 ifa
= if6_get_next(seq
, v
);
3812 static void if6_seq_stop(struct seq_file
*seq
, void *v
)
3815 rcu_read_unlock_bh();
3818 static int if6_seq_show(struct seq_file
*seq
, void *v
)
3820 struct inet6_ifaddr
*ifp
= (struct inet6_ifaddr
*)v
;
3821 seq_printf(seq
, "%pi6 %02x %02x %02x %02x %8s\n",
3823 ifp
->idev
->dev
->ifindex
,
3827 ifp
->idev
->dev
->name
);
3831 static const struct seq_operations if6_seq_ops
= {
3832 .start
= if6_seq_start
,
3833 .next
= if6_seq_next
,
3834 .show
= if6_seq_show
,
3835 .stop
= if6_seq_stop
,
3838 static int if6_seq_open(struct inode
*inode
, struct file
*file
)
3840 return seq_open_net(inode
, file
, &if6_seq_ops
,
3841 sizeof(struct if6_iter_state
));
3844 static const struct file_operations if6_fops
= {
3845 .owner
= THIS_MODULE
,
3846 .open
= if6_seq_open
,
3848 .llseek
= seq_lseek
,
3849 .release
= seq_release_net
,
3852 static int __net_init
if6_proc_net_init(struct net
*net
)
3854 if (!proc_create("if_inet6", S_IRUGO
, net
->proc_net
, &if6_fops
))
3859 static void __net_exit
if6_proc_net_exit(struct net
*net
)
3861 remove_proc_entry("if_inet6", net
->proc_net
);
3864 static struct pernet_operations if6_proc_net_ops
= {
3865 .init
= if6_proc_net_init
,
3866 .exit
= if6_proc_net_exit
,
3869 int __init
if6_proc_init(void)
3871 return register_pernet_subsys(&if6_proc_net_ops
);
3874 void if6_proc_exit(void)
3876 unregister_pernet_subsys(&if6_proc_net_ops
);
3878 #endif /* CONFIG_PROC_FS */
3880 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3881 /* Check if address is a home address configured on any interface. */
3882 int ipv6_chk_home_addr(struct net
*net
, const struct in6_addr
*addr
)
3885 struct inet6_ifaddr
*ifp
= NULL
;
3886 unsigned int hash
= inet6_addr_hash(addr
);
3889 hlist_for_each_entry_rcu_bh(ifp
, &inet6_addr_lst
[hash
], addr_lst
) {
3890 if (!net_eq(dev_net(ifp
->idev
->dev
), net
))
3892 if (ipv6_addr_equal(&ifp
->addr
, addr
) &&
3893 (ifp
->flags
& IFA_F_HOMEADDRESS
)) {
3898 rcu_read_unlock_bh();
3904 * Periodic address status verification
3907 static void addrconf_verify_rtnl(void)
3909 unsigned long now
, next
, next_sec
, next_sched
;
3910 struct inet6_ifaddr
*ifp
;
3917 next
= round_jiffies_up(now
+ ADDR_CHECK_FREQUENCY
);
3919 cancel_delayed_work(&addr_chk_work
);
3921 for (i
= 0; i
< IN6_ADDR_HSIZE
; i
++) {
3923 hlist_for_each_entry_rcu_bh(ifp
, &inet6_addr_lst
[i
], addr_lst
) {
3926 /* When setting preferred_lft to a value not zero or
3927 * infinity, while valid_lft is infinity
3928 * IFA_F_PERMANENT has a non-infinity life time.
3930 if ((ifp
->flags
& IFA_F_PERMANENT
) &&
3931 (ifp
->prefered_lft
== INFINITY_LIFE_TIME
))
3934 spin_lock(&ifp
->lock
);
3935 /* We try to batch several events at once. */
3936 age
= (now
- ifp
->tstamp
+ ADDRCONF_TIMER_FUZZ_MINUS
) / HZ
;
3938 if (ifp
->valid_lft
!= INFINITY_LIFE_TIME
&&
3939 age
>= ifp
->valid_lft
) {
3940 spin_unlock(&ifp
->lock
);
3944 } else if (ifp
->prefered_lft
== INFINITY_LIFE_TIME
) {
3945 spin_unlock(&ifp
->lock
);
3947 } else if (age
>= ifp
->prefered_lft
) {
3948 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3951 if (!(ifp
->flags
&IFA_F_DEPRECATED
)) {
3953 ifp
->flags
|= IFA_F_DEPRECATED
;
3956 if ((ifp
->valid_lft
!= INFINITY_LIFE_TIME
) &&
3957 (time_before(ifp
->tstamp
+ ifp
->valid_lft
* HZ
, next
)))
3958 next
= ifp
->tstamp
+ ifp
->valid_lft
* HZ
;
3960 spin_unlock(&ifp
->lock
);
3965 ipv6_ifa_notify(0, ifp
);
3969 } else if ((ifp
->flags
&IFA_F_TEMPORARY
) &&
3970 !(ifp
->flags
&IFA_F_TENTATIVE
)) {
3971 unsigned long regen_advance
= ifp
->idev
->cnf
.regen_max_retry
*
3972 ifp
->idev
->cnf
.dad_transmits
*
3973 NEIGH_VAR(ifp
->idev
->nd_parms
, RETRANS_TIME
) / HZ
;
3975 if (age
>= ifp
->prefered_lft
- regen_advance
) {
3976 struct inet6_ifaddr
*ifpub
= ifp
->ifpub
;
3977 if (time_before(ifp
->tstamp
+ ifp
->prefered_lft
* HZ
, next
))
3978 next
= ifp
->tstamp
+ ifp
->prefered_lft
* HZ
;
3979 if (!ifp
->regen_count
&& ifpub
) {
3982 in6_ifa_hold(ifpub
);
3983 spin_unlock(&ifp
->lock
);
3985 spin_lock(&ifpub
->lock
);
3986 ifpub
->regen_count
= 0;
3987 spin_unlock(&ifpub
->lock
);
3988 ipv6_create_tempaddr(ifpub
, ifp
);
3993 } else if (time_before(ifp
->tstamp
+ ifp
->prefered_lft
* HZ
- regen_advance
* HZ
, next
))
3994 next
= ifp
->tstamp
+ ifp
->prefered_lft
* HZ
- regen_advance
* HZ
;
3995 spin_unlock(&ifp
->lock
);
3997 /* ifp->prefered_lft <= ifp->valid_lft */
3998 if (time_before(ifp
->tstamp
+ ifp
->prefered_lft
* HZ
, next
))
3999 next
= ifp
->tstamp
+ ifp
->prefered_lft
* HZ
;
4000 spin_unlock(&ifp
->lock
);
4005 next_sec
= round_jiffies_up(next
);
4008 /* If rounded timeout is accurate enough, accept it. */
4009 if (time_before(next_sec
, next
+ ADDRCONF_TIMER_FUZZ
))
4010 next_sched
= next_sec
;
4012 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4013 if (time_before(next_sched
, jiffies
+ ADDRCONF_TIMER_FUZZ_MAX
))
4014 next_sched
= jiffies
+ ADDRCONF_TIMER_FUZZ_MAX
;
4016 ADBG(KERN_DEBUG
"now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4017 now
, next
, next_sec
, next_sched
);
4018 mod_delayed_work(addrconf_wq
, &addr_chk_work
, next_sched
- now
);
4019 rcu_read_unlock_bh();
4022 static void addrconf_verify_work(struct work_struct
*w
)
4025 addrconf_verify_rtnl();
4029 static void addrconf_verify(void)
4031 mod_delayed_work(addrconf_wq
, &addr_chk_work
, 0);
4034 static struct in6_addr
*extract_addr(struct nlattr
*addr
, struct nlattr
*local
,
4035 struct in6_addr
**peer_pfx
)
4037 struct in6_addr
*pfx
= NULL
;
4042 pfx
= nla_data(addr
);
4045 if (pfx
&& nla_memcmp(local
, pfx
, sizeof(*pfx
)))
4047 pfx
= nla_data(local
);
4053 static const struct nla_policy ifa_ipv6_policy
[IFA_MAX
+1] = {
4054 [IFA_ADDRESS
] = { .len
= sizeof(struct in6_addr
) },
4055 [IFA_LOCAL
] = { .len
= sizeof(struct in6_addr
) },
4056 [IFA_CACHEINFO
] = { .len
= sizeof(struct ifa_cacheinfo
) },
4057 [IFA_FLAGS
] = { .len
= sizeof(u32
) },
4061 inet6_rtm_deladdr(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
4063 struct net
*net
= sock_net(skb
->sk
);
4064 struct ifaddrmsg
*ifm
;
4065 struct nlattr
*tb
[IFA_MAX
+1];
4066 struct in6_addr
*pfx
, *peer_pfx
;
4070 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFA_MAX
, ifa_ipv6_policy
);
4074 ifm
= nlmsg_data(nlh
);
4075 pfx
= extract_addr(tb
[IFA_ADDRESS
], tb
[IFA_LOCAL
], &peer_pfx
);
4079 ifa_flags
= tb
[IFA_FLAGS
] ? nla_get_u32(tb
[IFA_FLAGS
]) : ifm
->ifa_flags
;
4081 /* We ignore other flags so far. */
4082 ifa_flags
&= IFA_F_MANAGETEMPADDR
;
4084 return inet6_addr_del(net
, ifm
->ifa_index
, ifa_flags
, pfx
,
4085 ifm
->ifa_prefixlen
);
4088 static int inet6_addr_modify(struct inet6_ifaddr
*ifp
, u32 ifa_flags
,
4089 u32 prefered_lft
, u32 valid_lft
)
4093 unsigned long timeout
;
4094 bool was_managetempaddr
;
4095 bool had_prefixroute
;
4099 if (!valid_lft
|| (prefered_lft
> valid_lft
))
4102 if (ifa_flags
& IFA_F_MANAGETEMPADDR
&&
4103 (ifp
->flags
& IFA_F_TEMPORARY
|| ifp
->prefix_len
!= 64))
4106 timeout
= addrconf_timeout_fixup(valid_lft
, HZ
);
4107 if (addrconf_finite_timeout(timeout
)) {
4108 expires
= jiffies_to_clock_t(timeout
* HZ
);
4109 valid_lft
= timeout
;
4110 flags
= RTF_EXPIRES
;
4114 ifa_flags
|= IFA_F_PERMANENT
;
4117 timeout
= addrconf_timeout_fixup(prefered_lft
, HZ
);
4118 if (addrconf_finite_timeout(timeout
)) {
4120 ifa_flags
|= IFA_F_DEPRECATED
;
4121 prefered_lft
= timeout
;
4124 spin_lock_bh(&ifp
->lock
);
4125 was_managetempaddr
= ifp
->flags
& IFA_F_MANAGETEMPADDR
;
4126 had_prefixroute
= ifp
->flags
& IFA_F_PERMANENT
&&
4127 !(ifp
->flags
& IFA_F_NOPREFIXROUTE
);
4128 ifp
->flags
&= ~(IFA_F_DEPRECATED
| IFA_F_PERMANENT
| IFA_F_NODAD
|
4129 IFA_F_HOMEADDRESS
| IFA_F_MANAGETEMPADDR
|
4130 IFA_F_NOPREFIXROUTE
);
4131 ifp
->flags
|= ifa_flags
;
4132 ifp
->tstamp
= jiffies
;
4133 ifp
->valid_lft
= valid_lft
;
4134 ifp
->prefered_lft
= prefered_lft
;
4136 spin_unlock_bh(&ifp
->lock
);
4137 if (!(ifp
->flags
&IFA_F_TENTATIVE
))
4138 ipv6_ifa_notify(0, ifp
);
4140 if (!(ifa_flags
& IFA_F_NOPREFIXROUTE
)) {
4141 addrconf_prefix_route(&ifp
->addr
, ifp
->prefix_len
, ifp
->idev
->dev
,
4143 } else if (had_prefixroute
) {
4144 enum cleanup_prefix_rt_t action
;
4145 unsigned long rt_expires
;
4147 write_lock_bh(&ifp
->idev
->lock
);
4148 action
= check_cleanup_prefix_route(ifp
, &rt_expires
);
4149 write_unlock_bh(&ifp
->idev
->lock
);
4151 if (action
!= CLEANUP_PREFIX_RT_NOP
) {
4152 cleanup_prefix_route(ifp
, rt_expires
,
4153 action
== CLEANUP_PREFIX_RT_DEL
);
4157 if (was_managetempaddr
|| ifp
->flags
& IFA_F_MANAGETEMPADDR
) {
4158 if (was_managetempaddr
&& !(ifp
->flags
& IFA_F_MANAGETEMPADDR
))
4159 valid_lft
= prefered_lft
= 0;
4160 manage_tempaddrs(ifp
->idev
, ifp
, valid_lft
, prefered_lft
,
4161 !was_managetempaddr
, jiffies
);
4164 addrconf_verify_rtnl();
4170 inet6_rtm_newaddr(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
4172 struct net
*net
= sock_net(skb
->sk
);
4173 struct ifaddrmsg
*ifm
;
4174 struct nlattr
*tb
[IFA_MAX
+1];
4175 struct in6_addr
*pfx
, *peer_pfx
;
4176 struct inet6_ifaddr
*ifa
;
4177 struct net_device
*dev
;
4178 u32 valid_lft
= INFINITY_LIFE_TIME
, preferred_lft
= INFINITY_LIFE_TIME
;
4182 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFA_MAX
, ifa_ipv6_policy
);
4186 ifm
= nlmsg_data(nlh
);
4187 pfx
= extract_addr(tb
[IFA_ADDRESS
], tb
[IFA_LOCAL
], &peer_pfx
);
4191 if (tb
[IFA_CACHEINFO
]) {
4192 struct ifa_cacheinfo
*ci
;
4194 ci
= nla_data(tb
[IFA_CACHEINFO
]);
4195 valid_lft
= ci
->ifa_valid
;
4196 preferred_lft
= ci
->ifa_prefered
;
4198 preferred_lft
= INFINITY_LIFE_TIME
;
4199 valid_lft
= INFINITY_LIFE_TIME
;
4202 dev
= __dev_get_by_index(net
, ifm
->ifa_index
);
4206 ifa_flags
= tb
[IFA_FLAGS
] ? nla_get_u32(tb
[IFA_FLAGS
]) : ifm
->ifa_flags
;
4208 /* We ignore other flags so far. */
4209 ifa_flags
&= IFA_F_NODAD
| IFA_F_HOMEADDRESS
| IFA_F_MANAGETEMPADDR
|
4210 IFA_F_NOPREFIXROUTE
| IFA_F_MCAUTOJOIN
;
4212 ifa
= ipv6_get_ifaddr(net
, pfx
, dev
, 1);
4215 * It would be best to check for !NLM_F_CREATE here but
4216 * userspace already relies on not having to provide this.
4218 return inet6_addr_add(net
, ifm
->ifa_index
, pfx
, peer_pfx
,
4219 ifm
->ifa_prefixlen
, ifa_flags
,
4220 preferred_lft
, valid_lft
);
4223 if (nlh
->nlmsg_flags
& NLM_F_EXCL
||
4224 !(nlh
->nlmsg_flags
& NLM_F_REPLACE
))
4227 err
= inet6_addr_modify(ifa
, ifa_flags
, preferred_lft
, valid_lft
);
4234 static void put_ifaddrmsg(struct nlmsghdr
*nlh
, u8 prefixlen
, u32 flags
,
4235 u8 scope
, int ifindex
)
4237 struct ifaddrmsg
*ifm
;
4239 ifm
= nlmsg_data(nlh
);
4240 ifm
->ifa_family
= AF_INET6
;
4241 ifm
->ifa_prefixlen
= prefixlen
;
4242 ifm
->ifa_flags
= flags
;
4243 ifm
->ifa_scope
= scope
;
4244 ifm
->ifa_index
= ifindex
;
4247 static int put_cacheinfo(struct sk_buff
*skb
, unsigned long cstamp
,
4248 unsigned long tstamp
, u32 preferred
, u32 valid
)
4250 struct ifa_cacheinfo ci
;
4252 ci
.cstamp
= cstamp_delta(cstamp
);
4253 ci
.tstamp
= cstamp_delta(tstamp
);
4254 ci
.ifa_prefered
= preferred
;
4255 ci
.ifa_valid
= valid
;
4257 return nla_put(skb
, IFA_CACHEINFO
, sizeof(ci
), &ci
);
4260 static inline int rt_scope(int ifa_scope
)
4262 if (ifa_scope
& IFA_HOST
)
4263 return RT_SCOPE_HOST
;
4264 else if (ifa_scope
& IFA_LINK
)
4265 return RT_SCOPE_LINK
;
4266 else if (ifa_scope
& IFA_SITE
)
4267 return RT_SCOPE_SITE
;
4269 return RT_SCOPE_UNIVERSE
;
4272 static inline int inet6_ifaddr_msgsize(void)
4274 return NLMSG_ALIGN(sizeof(struct ifaddrmsg
))
4275 + nla_total_size(16) /* IFA_LOCAL */
4276 + nla_total_size(16) /* IFA_ADDRESS */
4277 + nla_total_size(sizeof(struct ifa_cacheinfo
))
4278 + nla_total_size(4) /* IFA_FLAGS */;
4281 static int inet6_fill_ifaddr(struct sk_buff
*skb
, struct inet6_ifaddr
*ifa
,
4282 u32 portid
, u32 seq
, int event
, unsigned int flags
)
4284 struct nlmsghdr
*nlh
;
4285 u32 preferred
, valid
;
4287 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct ifaddrmsg
), flags
);
4291 put_ifaddrmsg(nlh
, ifa
->prefix_len
, ifa
->flags
, rt_scope(ifa
->scope
),
4292 ifa
->idev
->dev
->ifindex
);
4294 if (!((ifa
->flags
&IFA_F_PERMANENT
) &&
4295 (ifa
->prefered_lft
== INFINITY_LIFE_TIME
))) {
4296 preferred
= ifa
->prefered_lft
;
4297 valid
= ifa
->valid_lft
;
4298 if (preferred
!= INFINITY_LIFE_TIME
) {
4299 long tval
= (jiffies
- ifa
->tstamp
)/HZ
;
4300 if (preferred
> tval
)
4304 if (valid
!= INFINITY_LIFE_TIME
) {
4312 preferred
= INFINITY_LIFE_TIME
;
4313 valid
= INFINITY_LIFE_TIME
;
4316 if (!ipv6_addr_any(&ifa
->peer_addr
)) {
4317 if (nla_put_in6_addr(skb
, IFA_LOCAL
, &ifa
->addr
) < 0 ||
4318 nla_put_in6_addr(skb
, IFA_ADDRESS
, &ifa
->peer_addr
) < 0)
4321 if (nla_put_in6_addr(skb
, IFA_ADDRESS
, &ifa
->addr
) < 0)
4324 if (put_cacheinfo(skb
, ifa
->cstamp
, ifa
->tstamp
, preferred
, valid
) < 0)
4327 if (nla_put_u32(skb
, IFA_FLAGS
, ifa
->flags
) < 0)
4330 nlmsg_end(skb
, nlh
);
4334 nlmsg_cancel(skb
, nlh
);
4338 static int inet6_fill_ifmcaddr(struct sk_buff
*skb
, struct ifmcaddr6
*ifmca
,
4339 u32 portid
, u32 seq
, int event
, u16 flags
)
4341 struct nlmsghdr
*nlh
;
4342 u8 scope
= RT_SCOPE_UNIVERSE
;
4343 int ifindex
= ifmca
->idev
->dev
->ifindex
;
4345 if (ipv6_addr_scope(&ifmca
->mca_addr
) & IFA_SITE
)
4346 scope
= RT_SCOPE_SITE
;
4348 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct ifaddrmsg
), flags
);
4352 put_ifaddrmsg(nlh
, 128, IFA_F_PERMANENT
, scope
, ifindex
);
4353 if (nla_put_in6_addr(skb
, IFA_MULTICAST
, &ifmca
->mca_addr
) < 0 ||
4354 put_cacheinfo(skb
, ifmca
->mca_cstamp
, ifmca
->mca_tstamp
,
4355 INFINITY_LIFE_TIME
, INFINITY_LIFE_TIME
) < 0) {
4356 nlmsg_cancel(skb
, nlh
);
4360 nlmsg_end(skb
, nlh
);
4364 static int inet6_fill_ifacaddr(struct sk_buff
*skb
, struct ifacaddr6
*ifaca
,
4365 u32 portid
, u32 seq
, int event
, unsigned int flags
)
4367 struct nlmsghdr
*nlh
;
4368 u8 scope
= RT_SCOPE_UNIVERSE
;
4369 int ifindex
= ifaca
->aca_idev
->dev
->ifindex
;
4371 if (ipv6_addr_scope(&ifaca
->aca_addr
) & IFA_SITE
)
4372 scope
= RT_SCOPE_SITE
;
4374 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct ifaddrmsg
), flags
);
4378 put_ifaddrmsg(nlh
, 128, IFA_F_PERMANENT
, scope
, ifindex
);
4379 if (nla_put_in6_addr(skb
, IFA_ANYCAST
, &ifaca
->aca_addr
) < 0 ||
4380 put_cacheinfo(skb
, ifaca
->aca_cstamp
, ifaca
->aca_tstamp
,
4381 INFINITY_LIFE_TIME
, INFINITY_LIFE_TIME
) < 0) {
4382 nlmsg_cancel(skb
, nlh
);
4386 nlmsg_end(skb
, nlh
);
4396 /* called with rcu_read_lock() */
4397 static int in6_dump_addrs(struct inet6_dev
*idev
, struct sk_buff
*skb
,
4398 struct netlink_callback
*cb
, enum addr_type_t type
,
4399 int s_ip_idx
, int *p_ip_idx
)
4401 struct ifmcaddr6
*ifmca
;
4402 struct ifacaddr6
*ifaca
;
4404 int ip_idx
= *p_ip_idx
;
4406 read_lock_bh(&idev
->lock
);
4408 case UNICAST_ADDR
: {
4409 struct inet6_ifaddr
*ifa
;
4411 /* unicast address incl. temp addr */
4412 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
4413 if (++ip_idx
< s_ip_idx
)
4415 err
= inet6_fill_ifaddr(skb
, ifa
,
4416 NETLINK_CB(cb
->skb
).portid
,
4422 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
4426 case MULTICAST_ADDR
:
4427 /* multicast address */
4428 for (ifmca
= idev
->mc_list
; ifmca
;
4429 ifmca
= ifmca
->next
, ip_idx
++) {
4430 if (ip_idx
< s_ip_idx
)
4432 err
= inet6_fill_ifmcaddr(skb
, ifmca
,
4433 NETLINK_CB(cb
->skb
).portid
,
4442 /* anycast address */
4443 for (ifaca
= idev
->ac_list
; ifaca
;
4444 ifaca
= ifaca
->aca_next
, ip_idx
++) {
4445 if (ip_idx
< s_ip_idx
)
4447 err
= inet6_fill_ifacaddr(skb
, ifaca
,
4448 NETLINK_CB(cb
->skb
).portid
,
4459 read_unlock_bh(&idev
->lock
);
4464 static int inet6_dump_addr(struct sk_buff
*skb
, struct netlink_callback
*cb
,
4465 enum addr_type_t type
)
4467 struct net
*net
= sock_net(skb
->sk
);
4470 int s_idx
, s_ip_idx
;
4471 struct net_device
*dev
;
4472 struct inet6_dev
*idev
;
4473 struct hlist_head
*head
;
4476 s_idx
= idx
= cb
->args
[1];
4477 s_ip_idx
= ip_idx
= cb
->args
[2];
4480 cb
->seq
= atomic_read(&net
->ipv6
.dev_addr_genid
) ^ net
->dev_base_seq
;
4481 for (h
= s_h
; h
< NETDEV_HASHENTRIES
; h
++, s_idx
= 0) {
4483 head
= &net
->dev_index_head
[h
];
4484 hlist_for_each_entry_rcu(dev
, head
, index_hlist
) {
4487 if (h
> s_h
|| idx
> s_idx
)
4490 idev
= __in6_dev_get(dev
);
4494 if (in6_dump_addrs(idev
, skb
, cb
, type
,
4495 s_ip_idx
, &ip_idx
) < 0)
4505 cb
->args
[2] = ip_idx
;
4510 static int inet6_dump_ifaddr(struct sk_buff
*skb
, struct netlink_callback
*cb
)
4512 enum addr_type_t type
= UNICAST_ADDR
;
4514 return inet6_dump_addr(skb
, cb
, type
);
4517 static int inet6_dump_ifmcaddr(struct sk_buff
*skb
, struct netlink_callback
*cb
)
4519 enum addr_type_t type
= MULTICAST_ADDR
;
4521 return inet6_dump_addr(skb
, cb
, type
);
4525 static int inet6_dump_ifacaddr(struct sk_buff
*skb
, struct netlink_callback
*cb
)
4527 enum addr_type_t type
= ANYCAST_ADDR
;
4529 return inet6_dump_addr(skb
, cb
, type
);
4532 static int inet6_rtm_getaddr(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
)
4534 struct net
*net
= sock_net(in_skb
->sk
);
4535 struct ifaddrmsg
*ifm
;
4536 struct nlattr
*tb
[IFA_MAX
+1];
4537 struct in6_addr
*addr
= NULL
, *peer
;
4538 struct net_device
*dev
= NULL
;
4539 struct inet6_ifaddr
*ifa
;
4540 struct sk_buff
*skb
;
4543 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFA_MAX
, ifa_ipv6_policy
);
4547 addr
= extract_addr(tb
[IFA_ADDRESS
], tb
[IFA_LOCAL
], &peer
);
4553 ifm
= nlmsg_data(nlh
);
4555 dev
= __dev_get_by_index(net
, ifm
->ifa_index
);
4557 ifa
= ipv6_get_ifaddr(net
, addr
, dev
, 1);
4559 err
= -EADDRNOTAVAIL
;
4563 skb
= nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL
);
4569 err
= inet6_fill_ifaddr(skb
, ifa
, NETLINK_CB(in_skb
).portid
,
4570 nlh
->nlmsg_seq
, RTM_NEWADDR
, 0);
4572 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4573 WARN_ON(err
== -EMSGSIZE
);
4577 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
4584 static void inet6_ifa_notify(int event
, struct inet6_ifaddr
*ifa
)
4586 struct sk_buff
*skb
;
4587 struct net
*net
= dev_net(ifa
->idev
->dev
);
4590 skb
= nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC
);
4594 err
= inet6_fill_ifaddr(skb
, ifa
, 0, 0, event
, 0);
4596 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4597 WARN_ON(err
== -EMSGSIZE
);
4601 rtnl_notify(skb
, net
, 0, RTNLGRP_IPV6_IFADDR
, NULL
, GFP_ATOMIC
);
4605 rtnl_set_sk_err(net
, RTNLGRP_IPV6_IFADDR
, err
);
4608 static inline void ipv6_store_devconf(struct ipv6_devconf
*cnf
,
4609 __s32
*array
, int bytes
)
4611 BUG_ON(bytes
< (DEVCONF_MAX
* 4));
4613 memset(array
, 0, bytes
);
4614 array
[DEVCONF_FORWARDING
] = cnf
->forwarding
;
4615 array
[DEVCONF_HOPLIMIT
] = cnf
->hop_limit
;
4616 array
[DEVCONF_MTU6
] = cnf
->mtu6
;
4617 array
[DEVCONF_ACCEPT_RA
] = cnf
->accept_ra
;
4618 array
[DEVCONF_ACCEPT_REDIRECTS
] = cnf
->accept_redirects
;
4619 array
[DEVCONF_AUTOCONF
] = cnf
->autoconf
;
4620 array
[DEVCONF_DAD_TRANSMITS
] = cnf
->dad_transmits
;
4621 array
[DEVCONF_RTR_SOLICITS
] = cnf
->rtr_solicits
;
4622 array
[DEVCONF_RTR_SOLICIT_INTERVAL
] =
4623 jiffies_to_msecs(cnf
->rtr_solicit_interval
);
4624 array
[DEVCONF_RTR_SOLICIT_DELAY
] =
4625 jiffies_to_msecs(cnf
->rtr_solicit_delay
);
4626 array
[DEVCONF_FORCE_MLD_VERSION
] = cnf
->force_mld_version
;
4627 array
[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL
] =
4628 jiffies_to_msecs(cnf
->mldv1_unsolicited_report_interval
);
4629 array
[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL
] =
4630 jiffies_to_msecs(cnf
->mldv2_unsolicited_report_interval
);
4631 array
[DEVCONF_USE_TEMPADDR
] = cnf
->use_tempaddr
;
4632 array
[DEVCONF_TEMP_VALID_LFT
] = cnf
->temp_valid_lft
;
4633 array
[DEVCONF_TEMP_PREFERED_LFT
] = cnf
->temp_prefered_lft
;
4634 array
[DEVCONF_REGEN_MAX_RETRY
] = cnf
->regen_max_retry
;
4635 array
[DEVCONF_MAX_DESYNC_FACTOR
] = cnf
->max_desync_factor
;
4636 array
[DEVCONF_MAX_ADDRESSES
] = cnf
->max_addresses
;
4637 array
[DEVCONF_ACCEPT_RA_DEFRTR
] = cnf
->accept_ra_defrtr
;
4638 array
[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT
] = cnf
->accept_ra_min_hop_limit
;
4639 array
[DEVCONF_ACCEPT_RA_PINFO
] = cnf
->accept_ra_pinfo
;
4640 #ifdef CONFIG_IPV6_ROUTER_PREF
4641 array
[DEVCONF_ACCEPT_RA_RTR_PREF
] = cnf
->accept_ra_rtr_pref
;
4642 array
[DEVCONF_RTR_PROBE_INTERVAL
] =
4643 jiffies_to_msecs(cnf
->rtr_probe_interval
);
4644 #ifdef CONFIG_IPV6_ROUTE_INFO
4645 array
[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN
] = cnf
->accept_ra_rt_info_max_plen
;
4648 array
[DEVCONF_PROXY_NDP
] = cnf
->proxy_ndp
;
4649 array
[DEVCONF_ACCEPT_SOURCE_ROUTE
] = cnf
->accept_source_route
;
4650 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4651 array
[DEVCONF_OPTIMISTIC_DAD
] = cnf
->optimistic_dad
;
4652 array
[DEVCONF_USE_OPTIMISTIC
] = cnf
->use_optimistic
;
4654 #ifdef CONFIG_IPV6_MROUTE
4655 array
[DEVCONF_MC_FORWARDING
] = cnf
->mc_forwarding
;
4657 array
[DEVCONF_DISABLE_IPV6
] = cnf
->disable_ipv6
;
4658 array
[DEVCONF_ACCEPT_DAD
] = cnf
->accept_dad
;
4659 array
[DEVCONF_FORCE_TLLAO
] = cnf
->force_tllao
;
4660 array
[DEVCONF_NDISC_NOTIFY
] = cnf
->ndisc_notify
;
4661 array
[DEVCONF_SUPPRESS_FRAG_NDISC
] = cnf
->suppress_frag_ndisc
;
4662 array
[DEVCONF_ACCEPT_RA_FROM_LOCAL
] = cnf
->accept_ra_from_local
;
4663 array
[DEVCONF_ACCEPT_RA_MTU
] = cnf
->accept_ra_mtu
;
4664 array
[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN
] = cnf
->ignore_routes_with_linkdown
;
4665 /* we omit DEVCONF_STABLE_SECRET for now */
4666 array
[DEVCONF_USE_OIF_ADDRS_ONLY
] = cnf
->use_oif_addrs_only
;
4669 static inline size_t inet6_ifla6_size(void)
4671 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4672 + nla_total_size(sizeof(struct ifla_cacheinfo
))
4673 + nla_total_size(DEVCONF_MAX
* 4) /* IFLA_INET6_CONF */
4674 + nla_total_size(IPSTATS_MIB_MAX
* 8) /* IFLA_INET6_STATS */
4675 + nla_total_size(ICMP6_MIB_MAX
* 8) /* IFLA_INET6_ICMP6STATS */
4676 + nla_total_size(sizeof(struct in6_addr
)); /* IFLA_INET6_TOKEN */
4679 static inline size_t inet6_if_nlmsg_size(void)
4681 return NLMSG_ALIGN(sizeof(struct ifinfomsg
))
4682 + nla_total_size(IFNAMSIZ
) /* IFLA_IFNAME */
4683 + nla_total_size(MAX_ADDR_LEN
) /* IFLA_ADDRESS */
4684 + nla_total_size(4) /* IFLA_MTU */
4685 + nla_total_size(4) /* IFLA_LINK */
4686 + nla_total_size(1) /* IFLA_OPERSTATE */
4687 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4690 static inline void __snmp6_fill_statsdev(u64
*stats
, atomic_long_t
*mib
,
4691 int items
, int bytes
)
4694 int pad
= bytes
- sizeof(u64
) * items
;
4697 /* Use put_unaligned() because stats may not be aligned for u64. */
4698 put_unaligned(items
, &stats
[0]);
4699 for (i
= 1; i
< items
; i
++)
4700 put_unaligned(atomic_long_read(&mib
[i
]), &stats
[i
]);
4702 memset(&stats
[items
], 0, pad
);
4705 static inline void __snmp6_fill_stats64(u64
*stats
, void __percpu
*mib
,
4706 int bytes
, size_t syncpoff
)
4709 u64 buff
[IPSTATS_MIB_MAX
];
4710 int pad
= bytes
- sizeof(u64
) * IPSTATS_MIB_MAX
;
4714 memset(buff
, 0, sizeof(buff
));
4715 buff
[0] = IPSTATS_MIB_MAX
;
4717 for_each_possible_cpu(c
) {
4718 for (i
= 1; i
< IPSTATS_MIB_MAX
; i
++)
4719 buff
[i
] += snmp_get_cpu_field64(mib
, c
, i
, syncpoff
);
4722 memcpy(stats
, buff
, IPSTATS_MIB_MAX
* sizeof(u64
));
4723 memset(&stats
[IPSTATS_MIB_MAX
], 0, pad
);
4726 static void snmp6_fill_stats(u64
*stats
, struct inet6_dev
*idev
, int attrtype
,
4730 case IFLA_INET6_STATS
:
4731 __snmp6_fill_stats64(stats
, idev
->stats
.ipv6
, bytes
,
4732 offsetof(struct ipstats_mib
, syncp
));
4734 case IFLA_INET6_ICMP6STATS
:
4735 __snmp6_fill_statsdev(stats
, idev
->stats
.icmpv6dev
->mibs
, ICMP6_MIB_MAX
, bytes
);
4740 static int inet6_fill_ifla6_attrs(struct sk_buff
*skb
, struct inet6_dev
*idev
,
4741 u32 ext_filter_mask
)
4744 struct ifla_cacheinfo ci
;
4746 if (nla_put_u32(skb
, IFLA_INET6_FLAGS
, idev
->if_flags
))
4747 goto nla_put_failure
;
4748 ci
.max_reasm_len
= IPV6_MAXPLEN
;
4749 ci
.tstamp
= cstamp_delta(idev
->tstamp
);
4750 ci
.reachable_time
= jiffies_to_msecs(idev
->nd_parms
->reachable_time
);
4751 ci
.retrans_time
= jiffies_to_msecs(NEIGH_VAR(idev
->nd_parms
, RETRANS_TIME
));
4752 if (nla_put(skb
, IFLA_INET6_CACHEINFO
, sizeof(ci
), &ci
))
4753 goto nla_put_failure
;
4754 nla
= nla_reserve(skb
, IFLA_INET6_CONF
, DEVCONF_MAX
* sizeof(s32
));
4756 goto nla_put_failure
;
4757 ipv6_store_devconf(&idev
->cnf
, nla_data(nla
), nla_len(nla
));
4759 /* XXX - MC not implemented */
4761 if (ext_filter_mask
& RTEXT_FILTER_SKIP_STATS
)
4764 nla
= nla_reserve(skb
, IFLA_INET6_STATS
, IPSTATS_MIB_MAX
* sizeof(u64
));
4766 goto nla_put_failure
;
4767 snmp6_fill_stats(nla_data(nla
), idev
, IFLA_INET6_STATS
, nla_len(nla
));
4769 nla
= nla_reserve(skb
, IFLA_INET6_ICMP6STATS
, ICMP6_MIB_MAX
* sizeof(u64
));
4771 goto nla_put_failure
;
4772 snmp6_fill_stats(nla_data(nla
), idev
, IFLA_INET6_ICMP6STATS
, nla_len(nla
));
4774 nla
= nla_reserve(skb
, IFLA_INET6_TOKEN
, sizeof(struct in6_addr
));
4776 goto nla_put_failure
;
4778 if (nla_put_u8(skb
, IFLA_INET6_ADDR_GEN_MODE
, idev
->addr_gen_mode
))
4779 goto nla_put_failure
;
4781 read_lock_bh(&idev
->lock
);
4782 memcpy(nla_data(nla
), idev
->token
.s6_addr
, nla_len(nla
));
4783 read_unlock_bh(&idev
->lock
);
4791 static size_t inet6_get_link_af_size(const struct net_device
*dev
,
4792 u32 ext_filter_mask
)
4794 if (!__in6_dev_get(dev
))
4797 return inet6_ifla6_size();
4800 static int inet6_fill_link_af(struct sk_buff
*skb
, const struct net_device
*dev
,
4801 u32 ext_filter_mask
)
4803 struct inet6_dev
*idev
= __in6_dev_get(dev
);
4808 if (inet6_fill_ifla6_attrs(skb
, idev
, ext_filter_mask
) < 0)
4814 static int inet6_set_iftoken(struct inet6_dev
*idev
, struct in6_addr
*token
)
4816 struct inet6_ifaddr
*ifp
;
4817 struct net_device
*dev
= idev
->dev
;
4818 bool update_rs
= false;
4819 struct in6_addr ll_addr
;
4825 if (ipv6_addr_any(token
))
4827 if (dev
->flags
& (IFF_LOOPBACK
| IFF_NOARP
))
4829 if (!ipv6_accept_ra(idev
))
4831 if (idev
->cnf
.rtr_solicits
<= 0)
4834 write_lock_bh(&idev
->lock
);
4836 BUILD_BUG_ON(sizeof(token
->s6_addr
) != 16);
4837 memcpy(idev
->token
.s6_addr
+ 8, token
->s6_addr
+ 8, 8);
4839 write_unlock_bh(&idev
->lock
);
4841 if (!idev
->dead
&& (idev
->if_flags
& IF_READY
) &&
4842 !ipv6_get_lladdr(dev
, &ll_addr
, IFA_F_TENTATIVE
|
4843 IFA_F_OPTIMISTIC
)) {
4845 /* If we're not ready, then normal ifup will take care
4846 * of this. Otherwise, we need to request our rs here.
4848 ndisc_send_rs(dev
, &ll_addr
, &in6addr_linklocal_allrouters
);
4852 write_lock_bh(&idev
->lock
);
4855 idev
->if_flags
|= IF_RS_SENT
;
4856 idev
->rs_probes
= 1;
4857 addrconf_mod_rs_timer(idev
, idev
->cnf
.rtr_solicit_interval
);
4860 /* Well, that's kinda nasty ... */
4861 list_for_each_entry(ifp
, &idev
->addr_list
, if_list
) {
4862 spin_lock(&ifp
->lock
);
4863 if (ifp
->tokenized
) {
4865 ifp
->prefered_lft
= 0;
4867 spin_unlock(&ifp
->lock
);
4870 write_unlock_bh(&idev
->lock
);
4871 inet6_ifinfo_notify(RTM_NEWLINK
, idev
);
4872 addrconf_verify_rtnl();
4876 static const struct nla_policy inet6_af_policy
[IFLA_INET6_MAX
+ 1] = {
4877 [IFLA_INET6_ADDR_GEN_MODE
] = { .type
= NLA_U8
},
4878 [IFLA_INET6_TOKEN
] = { .len
= sizeof(struct in6_addr
) },
4881 static int inet6_validate_link_af(const struct net_device
*dev
,
4882 const struct nlattr
*nla
)
4884 struct nlattr
*tb
[IFLA_INET6_MAX
+ 1];
4886 if (dev
&& !__in6_dev_get(dev
))
4887 return -EAFNOSUPPORT
;
4889 return nla_parse_nested(tb
, IFLA_INET6_MAX
, nla
, inet6_af_policy
);
4892 static int inet6_set_link_af(struct net_device
*dev
, const struct nlattr
*nla
)
4895 struct inet6_dev
*idev
= __in6_dev_get(dev
);
4896 struct nlattr
*tb
[IFLA_INET6_MAX
+ 1];
4899 return -EAFNOSUPPORT
;
4901 if (nla_parse_nested(tb
, IFLA_INET6_MAX
, nla
, NULL
) < 0)
4904 if (tb
[IFLA_INET6_TOKEN
]) {
4905 err
= inet6_set_iftoken(idev
, nla_data(tb
[IFLA_INET6_TOKEN
]));
4910 if (tb
[IFLA_INET6_ADDR_GEN_MODE
]) {
4911 u8 mode
= nla_get_u8(tb
[IFLA_INET6_ADDR_GEN_MODE
]);
4913 if (mode
!= IN6_ADDR_GEN_MODE_EUI64
&&
4914 mode
!= IN6_ADDR_GEN_MODE_NONE
&&
4915 mode
!= IN6_ADDR_GEN_MODE_STABLE_PRIVACY
)
4918 if (mode
== IN6_ADDR_GEN_MODE_STABLE_PRIVACY
&&
4919 !idev
->cnf
.stable_secret
.initialized
&&
4920 !dev_net(dev
)->ipv6
.devconf_dflt
->stable_secret
.initialized
)
4923 idev
->addr_gen_mode
= mode
;
4930 static int inet6_fill_ifinfo(struct sk_buff
*skb
, struct inet6_dev
*idev
,
4931 u32 portid
, u32 seq
, int event
, unsigned int flags
)
4933 struct net_device
*dev
= idev
->dev
;
4934 struct ifinfomsg
*hdr
;
4935 struct nlmsghdr
*nlh
;
4938 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*hdr
), flags
);
4942 hdr
= nlmsg_data(nlh
);
4943 hdr
->ifi_family
= AF_INET6
;
4945 hdr
->ifi_type
= dev
->type
;
4946 hdr
->ifi_index
= dev
->ifindex
;
4947 hdr
->ifi_flags
= dev_get_flags(dev
);
4948 hdr
->ifi_change
= 0;
4950 if (nla_put_string(skb
, IFLA_IFNAME
, dev
->name
) ||
4952 nla_put(skb
, IFLA_ADDRESS
, dev
->addr_len
, dev
->dev_addr
)) ||
4953 nla_put_u32(skb
, IFLA_MTU
, dev
->mtu
) ||
4954 (dev
->ifindex
!= dev_get_iflink(dev
) &&
4955 nla_put_u32(skb
, IFLA_LINK
, dev_get_iflink(dev
))) ||
4956 nla_put_u8(skb
, IFLA_OPERSTATE
,
4957 netif_running(dev
) ? dev
->operstate
: IF_OPER_DOWN
))
4958 goto nla_put_failure
;
4959 protoinfo
= nla_nest_start(skb
, IFLA_PROTINFO
);
4961 goto nla_put_failure
;
4963 if (inet6_fill_ifla6_attrs(skb
, idev
, 0) < 0)
4964 goto nla_put_failure
;
4966 nla_nest_end(skb
, protoinfo
);
4967 nlmsg_end(skb
, nlh
);
4971 nlmsg_cancel(skb
, nlh
);
4975 static int inet6_dump_ifinfo(struct sk_buff
*skb
, struct netlink_callback
*cb
)
4977 struct net
*net
= sock_net(skb
->sk
);
4980 struct net_device
*dev
;
4981 struct inet6_dev
*idev
;
4982 struct hlist_head
*head
;
4985 s_idx
= cb
->args
[1];
4988 for (h
= s_h
; h
< NETDEV_HASHENTRIES
; h
++, s_idx
= 0) {
4990 head
= &net
->dev_index_head
[h
];
4991 hlist_for_each_entry_rcu(dev
, head
, index_hlist
) {
4994 idev
= __in6_dev_get(dev
);
4997 if (inet6_fill_ifinfo(skb
, idev
,
4998 NETLINK_CB(cb
->skb
).portid
,
5000 RTM_NEWLINK
, NLM_F_MULTI
) < 0)
5014 void inet6_ifinfo_notify(int event
, struct inet6_dev
*idev
)
5016 struct sk_buff
*skb
;
5017 struct net
*net
= dev_net(idev
->dev
);
5020 skb
= nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC
);
5024 err
= inet6_fill_ifinfo(skb
, idev
, 0, 0, event
, 0);
5026 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5027 WARN_ON(err
== -EMSGSIZE
);
5031 rtnl_notify(skb
, net
, 0, RTNLGRP_IPV6_IFINFO
, NULL
, GFP_ATOMIC
);
5035 rtnl_set_sk_err(net
, RTNLGRP_IPV6_IFINFO
, err
);
5038 static inline size_t inet6_prefix_nlmsg_size(void)
5040 return NLMSG_ALIGN(sizeof(struct prefixmsg
))
5041 + nla_total_size(sizeof(struct in6_addr
))
5042 + nla_total_size(sizeof(struct prefix_cacheinfo
));
5045 static int inet6_fill_prefix(struct sk_buff
*skb
, struct inet6_dev
*idev
,
5046 struct prefix_info
*pinfo
, u32 portid
, u32 seq
,
5047 int event
, unsigned int flags
)
5049 struct prefixmsg
*pmsg
;
5050 struct nlmsghdr
*nlh
;
5051 struct prefix_cacheinfo ci
;
5053 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*pmsg
), flags
);
5057 pmsg
= nlmsg_data(nlh
);
5058 pmsg
->prefix_family
= AF_INET6
;
5059 pmsg
->prefix_pad1
= 0;
5060 pmsg
->prefix_pad2
= 0;
5061 pmsg
->prefix_ifindex
= idev
->dev
->ifindex
;
5062 pmsg
->prefix_len
= pinfo
->prefix_len
;
5063 pmsg
->prefix_type
= pinfo
->type
;
5064 pmsg
->prefix_pad3
= 0;
5065 pmsg
->prefix_flags
= 0;
5067 pmsg
->prefix_flags
|= IF_PREFIX_ONLINK
;
5068 if (pinfo
->autoconf
)
5069 pmsg
->prefix_flags
|= IF_PREFIX_AUTOCONF
;
5071 if (nla_put(skb
, PREFIX_ADDRESS
, sizeof(pinfo
->prefix
), &pinfo
->prefix
))
5072 goto nla_put_failure
;
5073 ci
.preferred_time
= ntohl(pinfo
->prefered
);
5074 ci
.valid_time
= ntohl(pinfo
->valid
);
5075 if (nla_put(skb
, PREFIX_CACHEINFO
, sizeof(ci
), &ci
))
5076 goto nla_put_failure
;
5077 nlmsg_end(skb
, nlh
);
5081 nlmsg_cancel(skb
, nlh
);
5085 static void inet6_prefix_notify(int event
, struct inet6_dev
*idev
,
5086 struct prefix_info
*pinfo
)
5088 struct sk_buff
*skb
;
5089 struct net
*net
= dev_net(idev
->dev
);
5092 skb
= nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC
);
5096 err
= inet6_fill_prefix(skb
, idev
, pinfo
, 0, 0, event
, 0);
5098 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5099 WARN_ON(err
== -EMSGSIZE
);
5103 rtnl_notify(skb
, net
, 0, RTNLGRP_IPV6_PREFIX
, NULL
, GFP_ATOMIC
);
5107 rtnl_set_sk_err(net
, RTNLGRP_IPV6_PREFIX
, err
);
5110 static void __ipv6_ifa_notify(int event
, struct inet6_ifaddr
*ifp
)
5112 struct net
*net
= dev_net(ifp
->idev
->dev
);
5117 inet6_ifa_notify(event
? : RTM_NEWADDR
, ifp
);
5122 * If the address was optimistic
5123 * we inserted the route at the start of
5124 * our DAD process, so we don't need
5127 if (!(ifp
->rt
->rt6i_node
))
5128 ip6_ins_rt(ifp
->rt
);
5129 if (ifp
->idev
->cnf
.forwarding
)
5130 addrconf_join_anycast(ifp
);
5131 if (!ipv6_addr_any(&ifp
->peer_addr
))
5132 addrconf_prefix_route(&ifp
->peer_addr
, 128,
5133 ifp
->idev
->dev
, 0, 0);
5136 if (ifp
->idev
->cnf
.forwarding
)
5137 addrconf_leave_anycast(ifp
);
5138 addrconf_leave_solict(ifp
->idev
, &ifp
->addr
);
5139 if (!ipv6_addr_any(&ifp
->peer_addr
)) {
5140 struct rt6_info
*rt
;
5142 rt
= addrconf_get_prefix_route(&ifp
->peer_addr
, 128,
5143 ifp
->idev
->dev
, 0, 0);
5147 dst_hold(&ifp
->rt
->dst
);
5149 ip6_del_rt(ifp
->rt
);
5151 rt_genid_bump_ipv6(net
);
5154 atomic_inc(&net
->ipv6
.dev_addr_genid
);
5157 static void ipv6_ifa_notify(int event
, struct inet6_ifaddr
*ifp
)
5160 if (likely(ifp
->idev
->dead
== 0))
5161 __ipv6_ifa_notify(event
, ifp
);
5162 rcu_read_unlock_bh();
5165 #ifdef CONFIG_SYSCTL
5168 int addrconf_sysctl_forward(struct ctl_table
*ctl
, int write
,
5169 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
5171 int *valp
= ctl
->data
;
5174 struct ctl_table lctl
;
5178 * ctl->data points to idev->cnf.forwarding, we should
5179 * not modify it until we get the rtnl lock.
5184 ret
= proc_dointvec(&lctl
, write
, buffer
, lenp
, ppos
);
5187 ret
= addrconf_fixup_forwarding(ctl
, valp
, val
);
5194 int addrconf_sysctl_mtu(struct ctl_table
*ctl
, int write
,
5195 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
5197 struct inet6_dev
*idev
= ctl
->extra1
;
5198 int min_mtu
= IPV6_MIN_MTU
;
5199 struct ctl_table lctl
;
5202 lctl
.extra1
= &min_mtu
;
5203 lctl
.extra2
= idev
? &idev
->dev
->mtu
: NULL
;
5205 return proc_dointvec_minmax(&lctl
, write
, buffer
, lenp
, ppos
);
5208 static void dev_disable_change(struct inet6_dev
*idev
)
5210 struct netdev_notifier_info info
;
5212 if (!idev
|| !idev
->dev
)
5215 netdev_notifier_info_init(&info
, idev
->dev
);
5216 if (idev
->cnf
.disable_ipv6
)
5217 addrconf_notify(NULL
, NETDEV_DOWN
, &info
);
5219 addrconf_notify(NULL
, NETDEV_UP
, &info
);
5222 static void addrconf_disable_change(struct net
*net
, __s32 newf
)
5224 struct net_device
*dev
;
5225 struct inet6_dev
*idev
;
5228 for_each_netdev_rcu(net
, dev
) {
5229 idev
= __in6_dev_get(dev
);
5231 int changed
= (!idev
->cnf
.disable_ipv6
) ^ (!newf
);
5232 idev
->cnf
.disable_ipv6
= newf
;
5234 dev_disable_change(idev
);
5240 static int addrconf_disable_ipv6(struct ctl_table
*table
, int *p
, int newf
)
5245 if (!rtnl_trylock())
5246 return restart_syscall();
5248 net
= (struct net
*)table
->extra2
;
5252 if (p
== &net
->ipv6
.devconf_dflt
->disable_ipv6
) {
5257 if (p
== &net
->ipv6
.devconf_all
->disable_ipv6
) {
5258 net
->ipv6
.devconf_dflt
->disable_ipv6
= newf
;
5259 addrconf_disable_change(net
, newf
);
5260 } else if ((!newf
) ^ (!old
))
5261 dev_disable_change((struct inet6_dev
*)table
->extra1
);
5268 int addrconf_sysctl_disable(struct ctl_table
*ctl
, int write
,
5269 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
5271 int *valp
= ctl
->data
;
5274 struct ctl_table lctl
;
5278 * ctl->data points to idev->cnf.disable_ipv6, we should
5279 * not modify it until we get the rtnl lock.
5284 ret
= proc_dointvec(&lctl
, write
, buffer
, lenp
, ppos
);
5287 ret
= addrconf_disable_ipv6(ctl
, valp
, val
);
5294 int addrconf_sysctl_proxy_ndp(struct ctl_table
*ctl
, int write
,
5295 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
5297 int *valp
= ctl
->data
;
5302 ret
= proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
5305 if (write
&& old
!= new) {
5306 struct net
*net
= ctl
->extra2
;
5308 if (!rtnl_trylock())
5309 return restart_syscall();
5311 if (valp
== &net
->ipv6
.devconf_dflt
->proxy_ndp
)
5312 inet6_netconf_notify_devconf(net
, NETCONFA_PROXY_NEIGH
,
5313 NETCONFA_IFINDEX_DEFAULT
,
5314 net
->ipv6
.devconf_dflt
);
5315 else if (valp
== &net
->ipv6
.devconf_all
->proxy_ndp
)
5316 inet6_netconf_notify_devconf(net
, NETCONFA_PROXY_NEIGH
,
5317 NETCONFA_IFINDEX_ALL
,
5318 net
->ipv6
.devconf_all
);
5320 struct inet6_dev
*idev
= ctl
->extra1
;
5322 inet6_netconf_notify_devconf(net
, NETCONFA_PROXY_NEIGH
,
5332 static int addrconf_sysctl_stable_secret(struct ctl_table
*ctl
, int write
,
5333 void __user
*buffer
, size_t *lenp
,
5337 struct in6_addr addr
;
5338 char str
[IPV6_MAX_STRLEN
];
5339 struct ctl_table lctl
= *ctl
;
5340 struct net
*net
= ctl
->extra2
;
5341 struct ipv6_stable_secret
*secret
= ctl
->data
;
5343 if (&net
->ipv6
.devconf_all
->stable_secret
== ctl
->data
)
5346 lctl
.maxlen
= IPV6_MAX_STRLEN
;
5349 if (!rtnl_trylock())
5350 return restart_syscall();
5352 if (!write
&& !secret
->initialized
) {
5358 err
= snprintf(str
, sizeof(str
), "%pI6",
5360 if (err
>= sizeof(str
)) {
5366 err
= proc_dostring(&lctl
, write
, buffer
, lenp
, ppos
);
5370 if (in6_pton(str
, -1, addr
.in6_u
.u6_addr8
, -1, NULL
) != 1) {
5375 secret
->initialized
= true;
5376 secret
->secret
= addr
;
5378 if (&net
->ipv6
.devconf_dflt
->stable_secret
== ctl
->data
) {
5379 struct net_device
*dev
;
5381 for_each_netdev(net
, dev
) {
5382 struct inet6_dev
*idev
= __in6_dev_get(dev
);
5385 idev
->addr_gen_mode
=
5386 IN6_ADDR_GEN_MODE_STABLE_PRIVACY
;
5390 struct inet6_dev
*idev
= ctl
->extra1
;
5392 idev
->addr_gen_mode
= IN6_ADDR_GEN_MODE_STABLE_PRIVACY
;
5402 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table
*ctl
,
5404 void __user
*buffer
,
5408 int *valp
= ctl
->data
;
5411 struct ctl_table lctl
;
5414 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5415 * we should not modify it until we get the rtnl lock.
5420 ret
= proc_dointvec(&lctl
, write
, buffer
, lenp
, ppos
);
5423 ret
= addrconf_fixup_linkdown(ctl
, valp
, val
);
5429 static struct addrconf_sysctl_table
5431 struct ctl_table_header
*sysctl_header
;
5432 struct ctl_table addrconf_vars
[DEVCONF_MAX
+1];
5433 } addrconf_sysctl __read_mostly
= {
5434 .sysctl_header
= NULL
,
5437 .procname
= "forwarding",
5438 .data
= &ipv6_devconf
.forwarding
,
5439 .maxlen
= sizeof(int),
5441 .proc_handler
= addrconf_sysctl_forward
,
5444 .procname
= "hop_limit",
5445 .data
= &ipv6_devconf
.hop_limit
,
5446 .maxlen
= sizeof(int),
5448 .proc_handler
= proc_dointvec
,
5452 .data
= &ipv6_devconf
.mtu6
,
5453 .maxlen
= sizeof(int),
5455 .proc_handler
= addrconf_sysctl_mtu
,
5458 .procname
= "accept_ra",
5459 .data
= &ipv6_devconf
.accept_ra
,
5460 .maxlen
= sizeof(int),
5462 .proc_handler
= proc_dointvec
,
5465 .procname
= "accept_redirects",
5466 .data
= &ipv6_devconf
.accept_redirects
,
5467 .maxlen
= sizeof(int),
5469 .proc_handler
= proc_dointvec
,
5472 .procname
= "autoconf",
5473 .data
= &ipv6_devconf
.autoconf
,
5474 .maxlen
= sizeof(int),
5476 .proc_handler
= proc_dointvec
,
5479 .procname
= "dad_transmits",
5480 .data
= &ipv6_devconf
.dad_transmits
,
5481 .maxlen
= sizeof(int),
5483 .proc_handler
= proc_dointvec
,
5486 .procname
= "router_solicitations",
5487 .data
= &ipv6_devconf
.rtr_solicits
,
5488 .maxlen
= sizeof(int),
5490 .proc_handler
= proc_dointvec
,
5493 .procname
= "router_solicitation_interval",
5494 .data
= &ipv6_devconf
.rtr_solicit_interval
,
5495 .maxlen
= sizeof(int),
5497 .proc_handler
= proc_dointvec_jiffies
,
5500 .procname
= "router_solicitation_delay",
5501 .data
= &ipv6_devconf
.rtr_solicit_delay
,
5502 .maxlen
= sizeof(int),
5504 .proc_handler
= proc_dointvec_jiffies
,
5507 .procname
= "force_mld_version",
5508 .data
= &ipv6_devconf
.force_mld_version
,
5509 .maxlen
= sizeof(int),
5511 .proc_handler
= proc_dointvec
,
5514 .procname
= "mldv1_unsolicited_report_interval",
5516 &ipv6_devconf
.mldv1_unsolicited_report_interval
,
5517 .maxlen
= sizeof(int),
5519 .proc_handler
= proc_dointvec_ms_jiffies
,
5522 .procname
= "mldv2_unsolicited_report_interval",
5524 &ipv6_devconf
.mldv2_unsolicited_report_interval
,
5525 .maxlen
= sizeof(int),
5527 .proc_handler
= proc_dointvec_ms_jiffies
,
5530 .procname
= "use_tempaddr",
5531 .data
= &ipv6_devconf
.use_tempaddr
,
5532 .maxlen
= sizeof(int),
5534 .proc_handler
= proc_dointvec
,
5537 .procname
= "temp_valid_lft",
5538 .data
= &ipv6_devconf
.temp_valid_lft
,
5539 .maxlen
= sizeof(int),
5541 .proc_handler
= proc_dointvec
,
5544 .procname
= "temp_prefered_lft",
5545 .data
= &ipv6_devconf
.temp_prefered_lft
,
5546 .maxlen
= sizeof(int),
5548 .proc_handler
= proc_dointvec
,
5551 .procname
= "regen_max_retry",
5552 .data
= &ipv6_devconf
.regen_max_retry
,
5553 .maxlen
= sizeof(int),
5555 .proc_handler
= proc_dointvec
,
5558 .procname
= "max_desync_factor",
5559 .data
= &ipv6_devconf
.max_desync_factor
,
5560 .maxlen
= sizeof(int),
5562 .proc_handler
= proc_dointvec
,
5565 .procname
= "max_addresses",
5566 .data
= &ipv6_devconf
.max_addresses
,
5567 .maxlen
= sizeof(int),
5569 .proc_handler
= proc_dointvec
,
5572 .procname
= "accept_ra_defrtr",
5573 .data
= &ipv6_devconf
.accept_ra_defrtr
,
5574 .maxlen
= sizeof(int),
5576 .proc_handler
= proc_dointvec
,
5579 .procname
= "accept_ra_min_hop_limit",
5580 .data
= &ipv6_devconf
.accept_ra_min_hop_limit
,
5581 .maxlen
= sizeof(int),
5583 .proc_handler
= proc_dointvec
,
5586 .procname
= "accept_ra_pinfo",
5587 .data
= &ipv6_devconf
.accept_ra_pinfo
,
5588 .maxlen
= sizeof(int),
5590 .proc_handler
= proc_dointvec
,
5592 #ifdef CONFIG_IPV6_ROUTER_PREF
5594 .procname
= "accept_ra_rtr_pref",
5595 .data
= &ipv6_devconf
.accept_ra_rtr_pref
,
5596 .maxlen
= sizeof(int),
5598 .proc_handler
= proc_dointvec
,
5601 .procname
= "router_probe_interval",
5602 .data
= &ipv6_devconf
.rtr_probe_interval
,
5603 .maxlen
= sizeof(int),
5605 .proc_handler
= proc_dointvec_jiffies
,
5607 #ifdef CONFIG_IPV6_ROUTE_INFO
5609 .procname
= "accept_ra_rt_info_max_plen",
5610 .data
= &ipv6_devconf
.accept_ra_rt_info_max_plen
,
5611 .maxlen
= sizeof(int),
5613 .proc_handler
= proc_dointvec
,
5618 .procname
= "proxy_ndp",
5619 .data
= &ipv6_devconf
.proxy_ndp
,
5620 .maxlen
= sizeof(int),
5622 .proc_handler
= addrconf_sysctl_proxy_ndp
,
5625 .procname
= "accept_source_route",
5626 .data
= &ipv6_devconf
.accept_source_route
,
5627 .maxlen
= sizeof(int),
5629 .proc_handler
= proc_dointvec
,
5631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5633 .procname
= "optimistic_dad",
5634 .data
= &ipv6_devconf
.optimistic_dad
,
5635 .maxlen
= sizeof(int),
5637 .proc_handler
= proc_dointvec
,
5641 .procname
= "use_optimistic",
5642 .data
= &ipv6_devconf
.use_optimistic
,
5643 .maxlen
= sizeof(int),
5645 .proc_handler
= proc_dointvec
,
5649 #ifdef CONFIG_IPV6_MROUTE
5651 .procname
= "mc_forwarding",
5652 .data
= &ipv6_devconf
.mc_forwarding
,
5653 .maxlen
= sizeof(int),
5655 .proc_handler
= proc_dointvec
,
5659 .procname
= "disable_ipv6",
5660 .data
= &ipv6_devconf
.disable_ipv6
,
5661 .maxlen
= sizeof(int),
5663 .proc_handler
= addrconf_sysctl_disable
,
5666 .procname
= "accept_dad",
5667 .data
= &ipv6_devconf
.accept_dad
,
5668 .maxlen
= sizeof(int),
5670 .proc_handler
= proc_dointvec
,
5673 .procname
= "force_tllao",
5674 .data
= &ipv6_devconf
.force_tllao
,
5675 .maxlen
= sizeof(int),
5677 .proc_handler
= proc_dointvec
5680 .procname
= "ndisc_notify",
5681 .data
= &ipv6_devconf
.ndisc_notify
,
5682 .maxlen
= sizeof(int),
5684 .proc_handler
= proc_dointvec
5687 .procname
= "suppress_frag_ndisc",
5688 .data
= &ipv6_devconf
.suppress_frag_ndisc
,
5689 .maxlen
= sizeof(int),
5691 .proc_handler
= proc_dointvec
5694 .procname
= "accept_ra_from_local",
5695 .data
= &ipv6_devconf
.accept_ra_from_local
,
5696 .maxlen
= sizeof(int),
5698 .proc_handler
= proc_dointvec
,
5701 .procname
= "accept_ra_mtu",
5702 .data
= &ipv6_devconf
.accept_ra_mtu
,
5703 .maxlen
= sizeof(int),
5705 .proc_handler
= proc_dointvec
,
5708 .procname
= "stable_secret",
5709 .data
= &ipv6_devconf
.stable_secret
,
5710 .maxlen
= IPV6_MAX_STRLEN
,
5712 .proc_handler
= addrconf_sysctl_stable_secret
,
5715 .procname
= "use_oif_addrs_only",
5716 .data
= &ipv6_devconf
.use_oif_addrs_only
,
5717 .maxlen
= sizeof(int),
5719 .proc_handler
= proc_dointvec
,
5722 .procname
= "ignore_routes_with_linkdown",
5723 .data
= &ipv6_devconf
.ignore_routes_with_linkdown
,
5724 .maxlen
= sizeof(int),
5726 .proc_handler
= addrconf_sysctl_ignore_routes_with_linkdown
,
5734 static int __addrconf_sysctl_register(struct net
*net
, char *dev_name
,
5735 struct inet6_dev
*idev
, struct ipv6_devconf
*p
)
5738 struct addrconf_sysctl_table
*t
;
5739 char path
[sizeof("net/ipv6/conf/") + IFNAMSIZ
];
5741 t
= kmemdup(&addrconf_sysctl
, sizeof(*t
), GFP_KERNEL
);
5745 for (i
= 0; t
->addrconf_vars
[i
].data
; i
++) {
5746 t
->addrconf_vars
[i
].data
+= (char *)p
- (char *)&ipv6_devconf
;
5747 t
->addrconf_vars
[i
].extra1
= idev
; /* embedded; no ref */
5748 t
->addrconf_vars
[i
].extra2
= net
;
5751 snprintf(path
, sizeof(path
), "net/ipv6/conf/%s", dev_name
);
5753 t
->sysctl_header
= register_net_sysctl(net
, path
, t
->addrconf_vars
);
5754 if (!t
->sysctl_header
)
5766 static void __addrconf_sysctl_unregister(struct ipv6_devconf
*p
)
5768 struct addrconf_sysctl_table
*t
;
5775 unregister_net_sysctl_table(t
->sysctl_header
);
5779 static int addrconf_sysctl_register(struct inet6_dev
*idev
)
5783 if (!sysctl_dev_name_is_allowed(idev
->dev
->name
))
5786 err
= neigh_sysctl_register(idev
->dev
, idev
->nd_parms
,
5787 &ndisc_ifinfo_sysctl_change
);
5790 err
= __addrconf_sysctl_register(dev_net(idev
->dev
), idev
->dev
->name
,
5793 neigh_sysctl_unregister(idev
->nd_parms
);
5798 static void addrconf_sysctl_unregister(struct inet6_dev
*idev
)
5800 __addrconf_sysctl_unregister(&idev
->cnf
);
5801 neigh_sysctl_unregister(idev
->nd_parms
);
5807 static int __net_init
addrconf_init_net(struct net
*net
)
5810 struct ipv6_devconf
*all
, *dflt
;
5812 all
= kmemdup(&ipv6_devconf
, sizeof(ipv6_devconf
), GFP_KERNEL
);
5816 dflt
= kmemdup(&ipv6_devconf_dflt
, sizeof(ipv6_devconf_dflt
), GFP_KERNEL
);
5818 goto err_alloc_dflt
;
5820 /* these will be inherited by all namespaces */
5821 dflt
->autoconf
= ipv6_defaults
.autoconf
;
5822 dflt
->disable_ipv6
= ipv6_defaults
.disable_ipv6
;
5824 dflt
->stable_secret
.initialized
= false;
5825 all
->stable_secret
.initialized
= false;
5827 net
->ipv6
.devconf_all
= all
;
5828 net
->ipv6
.devconf_dflt
= dflt
;
5830 #ifdef CONFIG_SYSCTL
5831 err
= __addrconf_sysctl_register(net
, "all", NULL
, all
);
5835 err
= __addrconf_sysctl_register(net
, "default", NULL
, dflt
);
5841 #ifdef CONFIG_SYSCTL
5843 __addrconf_sysctl_unregister(all
);
5853 static void __net_exit
addrconf_exit_net(struct net
*net
)
5855 #ifdef CONFIG_SYSCTL
5856 __addrconf_sysctl_unregister(net
->ipv6
.devconf_dflt
);
5857 __addrconf_sysctl_unregister(net
->ipv6
.devconf_all
);
5859 kfree(net
->ipv6
.devconf_dflt
);
5860 kfree(net
->ipv6
.devconf_all
);
5863 static struct pernet_operations addrconf_ops
= {
5864 .init
= addrconf_init_net
,
5865 .exit
= addrconf_exit_net
,
5868 static struct rtnl_af_ops inet6_ops __read_mostly
= {
5870 .fill_link_af
= inet6_fill_link_af
,
5871 .get_link_af_size
= inet6_get_link_af_size
,
5872 .validate_link_af
= inet6_validate_link_af
,
5873 .set_link_af
= inet6_set_link_af
,
5877 * Init / cleanup code
5880 int __init
addrconf_init(void)
5882 struct inet6_dev
*idev
;
5885 err
= ipv6_addr_label_init();
5887 pr_crit("%s: cannot initialize default policy table: %d\n",
5892 err
= register_pernet_subsys(&addrconf_ops
);
5896 addrconf_wq
= create_workqueue("ipv6_addrconf");
5902 /* The addrconf netdev notifier requires that loopback_dev
5903 * has it's ipv6 private information allocated and setup
5904 * before it can bring up and give link-local addresses
5905 * to other devices which are up.
5907 * Unfortunately, loopback_dev is not necessarily the first
5908 * entry in the global dev_base list of net devices. In fact,
5909 * it is likely to be the very last entry on that list.
5910 * So this causes the notifier registry below to try and
5911 * give link-local addresses to all devices besides loopback_dev
5912 * first, then loopback_dev, which cases all the non-loopback_dev
5913 * devices to fail to get a link-local address.
5915 * So, as a temporary fix, allocate the ipv6 structure for
5916 * loopback_dev first by hand.
5917 * Longer term, all of the dependencies ipv6 has upon the loopback
5918 * device and it being up should be removed.
5921 idev
= ipv6_add_dev(init_net
.loopback_dev
);
5924 err
= PTR_ERR(idev
);
5928 for (i
= 0; i
< IN6_ADDR_HSIZE
; i
++)
5929 INIT_HLIST_HEAD(&inet6_addr_lst
[i
]);
5931 register_netdevice_notifier(&ipv6_dev_notf
);
5935 rtnl_af_register(&inet6_ops
);
5937 err
= __rtnl_register(PF_INET6
, RTM_GETLINK
, NULL
, inet6_dump_ifinfo
,
5942 /* Only the first call to __rtnl_register can fail */
5943 __rtnl_register(PF_INET6
, RTM_NEWADDR
, inet6_rtm_newaddr
, NULL
, NULL
);
5944 __rtnl_register(PF_INET6
, RTM_DELADDR
, inet6_rtm_deladdr
, NULL
, NULL
);
5945 __rtnl_register(PF_INET6
, RTM_GETADDR
, inet6_rtm_getaddr
,
5946 inet6_dump_ifaddr
, NULL
);
5947 __rtnl_register(PF_INET6
, RTM_GETMULTICAST
, NULL
,
5948 inet6_dump_ifmcaddr
, NULL
);
5949 __rtnl_register(PF_INET6
, RTM_GETANYCAST
, NULL
,
5950 inet6_dump_ifacaddr
, NULL
);
5951 __rtnl_register(PF_INET6
, RTM_GETNETCONF
, inet6_netconf_get_devconf
,
5952 inet6_netconf_dump_devconf
, NULL
);
5954 ipv6_addr_label_rtnl_register();
5958 rtnl_af_unregister(&inet6_ops
);
5959 unregister_netdevice_notifier(&ipv6_dev_notf
);
5961 destroy_workqueue(addrconf_wq
);
5963 unregister_pernet_subsys(&addrconf_ops
);
5965 ipv6_addr_label_cleanup();
5970 void addrconf_cleanup(void)
5972 struct net_device
*dev
;
5975 unregister_netdevice_notifier(&ipv6_dev_notf
);
5976 unregister_pernet_subsys(&addrconf_ops
);
5977 ipv6_addr_label_cleanup();
5981 __rtnl_af_unregister(&inet6_ops
);
5983 /* clean dev list */
5984 for_each_netdev(&init_net
, dev
) {
5985 if (__in6_dev_get(dev
) == NULL
)
5987 addrconf_ifdown(dev
, 1);
5989 addrconf_ifdown(init_net
.loopback_dev
, 2);
5994 spin_lock_bh(&addrconf_hash_lock
);
5995 for (i
= 0; i
< IN6_ADDR_HSIZE
; i
++)
5996 WARN_ON(!hlist_empty(&inet6_addr_lst
[i
]));
5997 spin_unlock_bh(&addrconf_hash_lock
);
5998 cancel_delayed_work(&addr_chk_work
);
6001 destroy_workqueue(addrconf_wq
);