This source file includes following definitions.
- cstamp_delta
- rfc3315_s14_backoff_init
- rfc3315_s14_backoff_update
- addrconf_sysctl_register
- addrconf_sysctl_unregister
- addrconf_link_ready
- addrconf_del_rs_timer
- addrconf_del_dad_work
- addrconf_mod_rs_timer
- addrconf_mod_dad_work
- snmp6_alloc_dev
- ipv6_add_dev
- ipv6_find_idev
- inet6_netconf_msgsize_devconf
- inet6_netconf_fill_devconf
- inet6_netconf_notify_devconf
- inet6_netconf_valid_get_req
- inet6_netconf_get_devconf
- inet6_netconf_dump_devconf
- dev_forward_change
- addrconf_forward_change
- addrconf_fixup_forwarding
- addrconf_linkdown_change
- addrconf_fixup_linkdown
- inet6_ifa_finish_destroy
- ipv6_link_dev_addr
- inet6_addr_hash
- ipv6_chk_same_addr
- ipv6_add_addr_hash
- ipv6_add_addr
- check_cleanup_prefix_route
- cleanup_prefix_route
- ipv6_del_addr
- ipv6_create_tempaddr
- ipv6_saddr_preferred
- ipv6_use_optimistic_addr
- ipv6_allow_optimistic_dad
- ipv6_get_saddr_eval
- __ipv6_dev_get_saddr
- ipv6_get_saddr_master
- ipv6_dev_get_saddr
- __ipv6_get_lladdr
- ipv6_get_lladdr
- ipv6_count_addresses
- ipv6_chk_addr
- ipv6_chk_addr_and_flags
- ipv6_chk_custom_prefix
- ipv6_chk_prefix
- ipv6_get_ifaddr
- addrconf_dad_stop
- addrconf_dad_end
- addrconf_dad_failure
- addrconf_join_solict
- addrconf_leave_solict
- addrconf_join_anycast
- addrconf_leave_anycast
- addrconf_ifid_6lowpan
- addrconf_ifid_ieee1394
- addrconf_ifid_arcnet
- addrconf_ifid_infiniband
- __ipv6_isatap_ifid
- addrconf_ifid_sit
- addrconf_ifid_gre
- addrconf_ifid_ip6tnl
- ipv6_generate_eui64
- ipv6_inherit_eui64
- ipv6_regen_rndid
- ipv6_try_regen_rndid
- addrconf_prefix_route
- addrconf_get_prefix_route
- addrconf_add_mroute
- addrconf_add_dev
- manage_tempaddrs
- is_addr_mode_generate_stable
- addrconf_prefix_rcv_add_addr
- addrconf_prefix_rcv
- addrconf_set_dstaddr
- ipv6_mc_config
- inet6_addr_add
- inet6_addr_del
- addrconf_add_ifaddr
- addrconf_del_ifaddr
- add_addr
- sit_add_v4_addrs
- init_loopback
- addrconf_add_linklocal
- ipv6_reserved_interfaceid
- ipv6_generate_stable_address
- ipv6_gen_mode_random_init
- addrconf_addr_gen
- addrconf_dev_config
- addrconf_sit_config
- addrconf_gre_config
- fixup_permanent_addr
- addrconf_permanent_addr
- addrconf_notify
- addrconf_type_change
- addr_is_local
- addrconf_ifdown
- addrconf_rs_timer
- addrconf_dad_kick
- addrconf_dad_begin
- addrconf_dad_start
- addrconf_dad_work
- ipv6_lonely_lladdr
- addrconf_dad_completed
- addrconf_dad_run
- if6_get_first
- if6_get_next
- if6_seq_start
- if6_seq_next
- if6_seq_stop
- if6_seq_show
- if6_proc_net_init
- if6_proc_net_exit
- if6_proc_init
- if6_proc_exit
- ipv6_chk_home_addr
- addrconf_verify_rtnl
- addrconf_verify_work
- addrconf_verify
- extract_addr
- inet6_rtm_deladdr
- modify_prefix_route
- inet6_addr_modify
- inet6_rtm_newaddr
- put_ifaddrmsg
- put_cacheinfo
- rt_scope
- inet6_ifaddr_msgsize
- inet6_fill_ifaddr
- inet6_fill_ifmcaddr
- inet6_fill_ifacaddr
- in6_dump_addrs
- inet6_valid_dump_ifaddr_req
- inet6_dump_addr
- inet6_dump_ifaddr
- inet6_dump_ifmcaddr
- inet6_dump_ifacaddr
- inet6_rtm_valid_getaddr_req
- inet6_rtm_getaddr
- inet6_ifa_notify
- ipv6_store_devconf
- inet6_ifla6_size
- inet6_if_nlmsg_size
- __snmp6_fill_statsdev
- __snmp6_fill_stats64
- snmp6_fill_stats
- inet6_fill_ifla6_attrs
- inet6_get_link_af_size
- inet6_fill_link_af
- inet6_set_iftoken
- check_addr_gen_mode
- check_stable_privacy
- inet6_validate_link_af
- inet6_set_link_af
- inet6_fill_ifinfo
- inet6_valid_dump_ifinfo
- inet6_dump_ifinfo
- inet6_ifinfo_notify
- inet6_prefix_nlmsg_size
- inet6_fill_prefix
- inet6_prefix_notify
- __ipv6_ifa_notify
- ipv6_ifa_notify
- addrconf_sysctl_forward
- addrconf_sysctl_mtu
- dev_disable_change
- addrconf_disable_change
- addrconf_disable_ipv6
- addrconf_sysctl_disable
- addrconf_sysctl_proxy_ndp
- addrconf_sysctl_addr_gen_mode
- addrconf_sysctl_stable_secret
- addrconf_sysctl_ignore_routes_with_linkdown
- addrconf_set_nopolicy
- addrconf_disable_policy_idev
- addrconf_disable_policy
- addrconf_sysctl_disable_policy
- __addrconf_sysctl_register
- __addrconf_sysctl_unregister
- addrconf_sysctl_register
- addrconf_sysctl_unregister
- addrconf_init_net
- addrconf_exit_net
- addrconf_init
- addrconf_cleanup
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37 #define pr_fmt(fmt) "IPv6: " fmt
38
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
65
66 #include <net/net_namespace.h>
67 #include <net/sock.h>
68 #include <net/snmp.h>
69
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
72 #include <net/ipv6.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
77 #include <net/tcp.h>
78 #include <net/ip.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
88
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
140
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149
150
151
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
154
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
158
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, int how);
168
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 int plen,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
173 bool no_gw);
174
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
186
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0,
222 .disable_ipv6 = 0,
223 .accept_dad = 0,
224 .suppress_frag_ndisc = 1,
225 .accept_ra_mtu = 1,
226 .stable_secret = {
227 .initialized = false,
228 },
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
232 .seg6_enabled = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235 #endif
236 .enhanced_dad = 1,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
238 .disable_policy = 0,
239 };
240
241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266 #ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269 #ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
272 #endif
273 #endif
274 .proxy_ndp = 0,
275 .accept_source_route = 0,
276 .disable_ipv6 = 0,
277 .accept_dad = 1,
278 .suppress_frag_ndisc = 1,
279 .accept_ra_mtu = 1,
280 .stable_secret = {
281 .initialized = false,
282 },
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
286 .seg6_enabled = 0,
287 #ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289 #endif
290 .enhanced_dad = 1,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
292 .disable_policy = 0,
293 };
294
295
296 static inline bool addrconf_link_ready(const struct net_device *dev)
297 {
298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
299 }
300
301 static void addrconf_del_rs_timer(struct inet6_dev *idev)
302 {
303 if (del_timer(&idev->rs_timer))
304 __in6_dev_put(idev);
305 }
306
307 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
308 {
309 if (cancel_delayed_work(&ifp->dad_work))
310 __in6_ifa_put(ifp);
311 }
312
313 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
314 unsigned long when)
315 {
316 if (!timer_pending(&idev->rs_timer))
317 in6_dev_hold(idev);
318 mod_timer(&idev->rs_timer, jiffies + when);
319 }
320
321 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
322 unsigned long delay)
323 {
324 in6_ifa_hold(ifp);
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
326 in6_ifa_put(ifp);
327 }
328
329 static int snmp6_alloc_dev(struct inet6_dev *idev)
330 {
331 int i;
332
333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
335 goto err_ip;
336
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
340 u64_stats_init(&addrconf_stats->syncp);
341 }
342
343
344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
345 GFP_KERNEL);
346 if (!idev->stats.icmpv6dev)
347 goto err_icmp;
348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6msgdev)
351 goto err_icmpmsg;
352
353 return 0;
354
355 err_icmpmsg:
356 kfree(idev->stats.icmpv6dev);
357 err_icmp:
358 free_percpu(idev->stats.ipv6);
359 err_ip:
360 return -ENOMEM;
361 }
362
363 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
364 {
365 struct inet6_dev *ndev;
366 int err = -ENOMEM;
367
368 ASSERT_RTNL();
369
370 if (dev->mtu < IPV6_MIN_MTU)
371 return ERR_PTR(-EINVAL);
372
373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
374 if (!ndev)
375 return ERR_PTR(err);
376
377 rwlock_init(&ndev->lock);
378 ndev->dev = dev;
379 INIT_LIST_HEAD(&ndev->addr_list);
380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
382
383 if (ndev->cnf.stable_secret.initialized)
384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
385
386 ndev->cnf.mtu6 = dev->mtu;
387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
388 if (!ndev->nd_parms) {
389 kfree(ndev);
390 return ERR_PTR(err);
391 }
392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
394
395 dev_hold(dev);
396
397 if (snmp6_alloc_dev(ndev) < 0) {
398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
399 __func__);
400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
401 dev_put(dev);
402 kfree(ndev);
403 return ERR_PTR(err);
404 }
405
406 if (snmp6_register_dev(ndev) < 0) {
407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
409 goto err_release;
410 }
411
412
413 refcount_set(&ndev->refcnt, 1);
414
415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
417
418 #if IS_ENABLED(CONFIG_IPV6_SIT)
419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
420 pr_info("%s: Disabled Multicast RS\n", dev->name);
421 ndev->cnf.rtr_solicits = 0;
422 }
423 #endif
424
425 INIT_LIST_HEAD(&ndev->tempaddr_list);
426 ndev->desync_factor = U32_MAX;
427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
429 dev->type == ARPHRD_TUNNEL6 ||
430 dev->type == ARPHRD_SIT ||
431 dev->type == ARPHRD_NONE) {
432 ndev->cnf.use_tempaddr = -1;
433 } else
434 ipv6_regen_rndid(ndev);
435
436 ndev->token = in6addr_any;
437
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
440
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
447 goto err_release;
448 }
449
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
451
452
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
455
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
457
458
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
462 return ndev;
463
464 err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
469 }
470
471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
472 {
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
480 if (IS_ERR(idev))
481 return idev;
482 }
483
484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487 }
488
489 static int inet6_netconf_msgsize_devconf(int type)
490 {
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4);
493 bool all = false;
494
495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500 #ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
503 #endif
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
506
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
509
510 return size;
511 }
512
513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517 {
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
520 bool all = false;
521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
524 if (!nlh)
525 return -EMSGSIZE;
526
527 if (type == NETCONFA_ALL)
528 all = true;
529
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
536 if (!devconf)
537 goto out;
538
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542 #ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
547 #endif
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
557 out:
558 nlmsg_end(skb, nlh);
559 return 0;
560
561 nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564 }
565
566 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
568 {
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
573 if (!skb)
574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
577 event, 0, type);
578 if (err < 0) {
579
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
585 return;
586 errout:
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
588 }
589
590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
595 };
596
597 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601 {
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
613
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634 }
635
636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
639 {
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
646 int ifindex;
647 int err;
648
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
650 if (err < 0)
651 return err;
652
653 if (!tb[NETCONFA_IFINDEX])
654 return -EINVAL;
655
656 err = -EINVAL;
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
666 dev = dev_get_by_index(net, ifindex);
667 if (!dev)
668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
670 if (!in6_dev)
671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
678 if (!skb)
679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
684 NETCONFA_ALL);
685 if (err < 0) {
686
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692 errout:
693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
697 return err;
698 }
699
700 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702 {
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
745 nlh->nlmsg_seq,
746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
748 NETCONFA_ALL) < 0) {
749 rcu_read_unlock();
750 goto done;
751 }
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
753 cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
762 nlh->nlmsg_seq,
763 RTM_NEWNETCONF, NLM_F_MULTI,
764 NETCONFA_ALL) < 0)
765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
773 nlh->nlmsg_seq,
774 RTM_NEWNETCONF, NLM_F_MULTI,
775 NETCONFA_ALL) < 0)
776 goto done;
777 else
778 h++;
779 }
780 done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785 }
786
787 #ifdef CONFIG_SYSCTL
788 static void dev_forward_change(struct inet6_dev *idev)
789 {
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
792
793 if (!idev)
794 return;
795 dev = idev->dev;
796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
798 if (dev->flags & IFF_MULTICAST) {
799 if (idev->cnf.forwarding) {
800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
808 }
809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
820 dev->ifindex, &idev->cnf);
821 }
822
823
824 static void addrconf_forward_change(struct net *net, __s32 newf)
825 {
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
829 for_each_netdev(net, dev) {
830 idev = __in6_dev_get(dev);
831 if (idev) {
832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
834 if (changed)
835 dev_forward_change(idev);
836 }
837 }
838 }
839
840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
841 {
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->forwarding) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->forwarding) {
863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
865 net->ipv6.devconf_dflt->forwarding = newf;
866 if ((!newf) ^ (!old_dflt))
867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
872 addrconf_forward_change(net, newf);
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
878 } else if ((!newf) ^ (!old))
879 dev_forward_change((struct inet6_dev *)table->extra1);
880 rtnl_unlock();
881
882 if (newf)
883 rt6_purge_dflt_routers(net);
884 return 1;
885 }
886
887 static void addrconf_linkdown_change(struct net *net, __s32 newf)
888 {
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
900 RTM_NEWNETCONF,
901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906 }
907
908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909 {
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
923 RTM_NEWNETCONF,
924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
936 RTM_NEWNETCONF,
937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944 }
945
946 #endif
947
948
949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950 {
951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
952
953 #ifdef NET_REFCNT_DEBUG
954 pr_debug("%s\n", __func__);
955 #endif
956
957 in6_dev_put(ifp->idev);
958
959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
962
963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
964 pr_warn("Freeing alive inet6 address %p\n", ifp);
965 return;
966 }
967
968 kfree_rcu(ifp, rcu);
969 }
970
971 static void
972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973 {
974 struct list_head *p;
975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
976
977
978
979
980
981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
985 break;
986 }
987
988 list_add_tail_rcu(&ifp->if_list, p);
989 }
990
991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
992 {
993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
996 }
997
998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
999 struct net_device *dev, unsigned int hash)
1000 {
1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012 }
1013
1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015 {
1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021
1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1024 err = -EEXIST;
1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1027 }
1028
1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032 }
1033
1034
1035
1036 static struct inet6_ifaddr *
1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1038 bool can_block, struct netlink_ext_ack *extack)
1039 {
1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1041 int addr_type = ipv6_addr_type(cfg->pfx);
1042 struct net *net = dev_net(idev->dev);
1043 struct inet6_ifaddr *ifa = NULL;
1044 struct fib6_info *f6i = NULL;
1045 int err = 0;
1046
1047 if (addr_type == IPV6_ADDR_ANY ||
1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
1051 !netif_is_l3_master(idev->dev) &&
1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1054
1055 if (idev->dead) {
1056 err = -ENODEV;
1057 goto out;
1058 }
1059
1060 if (idev->cnf.disable_ipv6) {
1061 err = -EACCES;
1062 goto out;
1063 }
1064
1065
1066
1067
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
1070 .i6vi_addr = *cfg->pfx,
1071 .i6vi_dev = idev,
1072 .extack = extack,
1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1080
1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1082 if (!ifa) {
1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1091 goto out;
1092 }
1093
1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
1096 f6i->dst_nopolicy = true;
1097
1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1103
1104 spin_lock_init(&ifa->lock);
1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1106 INIT_HLIST_NODE(&ifa->addr_lst);
1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
1109 ifa->rt_priority = cfg->rt_priority;
1110 ifa->flags = cfg->ifa_flags;
1111
1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
1113 ifa->flags |= IFA_F_TENTATIVE;
1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1116 ifa->cstamp = ifa->tstamp = jiffies;
1117 ifa->tokenized = false;
1118
1119 ifa->rt = f6i;
1120
1121 ifa->idev = idev;
1122 in6_dev_hold(idev);
1123
1124
1125 refcount_set(&ifa->refcnt, 1);
1126
1127 rcu_read_lock_bh();
1128
1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1134
1135 write_lock(&idev->lock);
1136
1137
1138 ipv6_link_dev_addr(idev, ifa);
1139
1140 if (ifa->flags&IFA_F_TEMPORARY) {
1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1142 in6_ifa_hold(ifa);
1143 }
1144
1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
1147
1148 rcu_read_unlock_bh();
1149
1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151 out:
1152 if (unlikely(err < 0)) {
1153 fib6_info_release(f6i);
1154
1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1164 }
1165
1166 enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP,
1168 CLEANUP_PREFIX_RT_DEL,
1169 CLEANUP_PREFIX_RT_EXPIRE,
1170 };
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190 static enum cleanup_prefix_rt_t
1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192 {
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215
1216
1217
1218
1219
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226 }
1227
1228 static void
1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
1231 {
1232 struct fib6_info *f6i;
1233
1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1235 ifp->prefix_len,
1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
1237 if (f6i) {
1238 if (del_rt)
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1240 else {
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1244 }
1245 }
1246 }
1247
1248
1249
1250
1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252 {
1253 int state;
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1256
1257 ASSERT_RTNL();
1258
1259 spin_lock_bh(&ifp->lock);
1260 state = ifp->state;
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1266
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1270
1271 write_lock_bh(&ifp->idev->lock);
1272
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1278 }
1279 __in6_ifa_put(ifp);
1280 }
1281
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1284
1285 list_del_rcu(&ifp->if_list);
1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1289
1290 addrconf_del_dad_work(ifp);
1291
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1295
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL, false);
1299 }
1300
1301
1302 rt6_remove_prefsrc(ifp);
1303 out:
1304 in6_ifa_put(ifp);
1305 }
1306
1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1308 struct inet6_ifaddr *ift,
1309 bool block)
1310 {
1311 struct inet6_dev *idev = ifp->idev;
1312 struct in6_addr addr, *tmpaddr;
1313 unsigned long tmp_tstamp, age;
1314 unsigned long regen_advance;
1315 struct ifa6_config cfg;
1316 int ret = 0;
1317 unsigned long now = jiffies;
1318 long max_desync_factor;
1319 s32 cnf_temp_preferred_lft;
1320
1321 write_lock_bh(&idev->lock);
1322 if (ift) {
1323 spin_lock_bh(&ift->lock);
1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1325 spin_unlock_bh(&ift->lock);
1326 tmpaddr = &addr;
1327 } else {
1328 tmpaddr = NULL;
1329 }
1330 retry:
1331 in6_dev_hold(idev);
1332 if (idev->cnf.use_tempaddr <= 0) {
1333 write_unlock_bh(&idev->lock);
1334 pr_info("%s: use_tempaddr is disabled\n", __func__);
1335 in6_dev_put(idev);
1336 ret = -1;
1337 goto out;
1338 }
1339 spin_lock_bh(&ifp->lock);
1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1341 idev->cnf.use_tempaddr = -1;
1342 spin_unlock_bh(&ifp->lock);
1343 write_unlock_bh(&idev->lock);
1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1345 __func__);
1346 in6_dev_put(idev);
1347 ret = -1;
1348 goto out;
1349 }
1350 in6_ifa_hold(ifp);
1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1352 ipv6_try_regen_rndid(idev, tmpaddr);
1353 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1354 age = (now - ifp->tstamp) / HZ;
1355
1356 regen_advance = idev->cnf.regen_max_retry *
1357 idev->cnf.dad_transmits *
1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1359
1360
1361
1362
1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1364 max_desync_factor = min_t(__u32,
1365 idev->cnf.max_desync_factor,
1366 cnf_temp_preferred_lft - regen_advance);
1367
1368 if (unlikely(idev->desync_factor > max_desync_factor)) {
1369 if (max_desync_factor > 0) {
1370 get_random_bytes(&idev->desync_factor,
1371 sizeof(idev->desync_factor));
1372 idev->desync_factor %= max_desync_factor;
1373 } else {
1374 idev->desync_factor = 0;
1375 }
1376 }
1377
1378 memset(&cfg, 0, sizeof(cfg));
1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1380 idev->cnf.temp_valid_lft + age);
1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1383
1384 cfg.plen = ifp->prefix_len;
1385 tmp_tstamp = ifp->tstamp;
1386 spin_unlock_bh(&ifp->lock);
1387
1388 write_unlock_bh(&idev->lock);
1389
1390
1391
1392
1393
1394
1395
1396
1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1398 if (cfg.preferred_lft <= regen_advance + age) {
1399 in6_ifa_put(ifp);
1400 in6_dev_put(idev);
1401 ret = -1;
1402 goto out;
1403 }
1404
1405 cfg.ifa_flags = IFA_F_TEMPORARY;
1406
1407 if (ifp->flags & IFA_F_OPTIMISTIC)
1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1409
1410 cfg.pfx = &addr;
1411 cfg.scope = ipv6_addr_scope(cfg.pfx);
1412
1413 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1414 if (IS_ERR(ift)) {
1415 in6_ifa_put(ifp);
1416 in6_dev_put(idev);
1417 pr_info("%s: retry temporary address regeneration\n", __func__);
1418 tmpaddr = &addr;
1419 write_lock_bh(&idev->lock);
1420 goto retry;
1421 }
1422
1423 spin_lock_bh(&ift->lock);
1424 ift->ifpub = ifp;
1425 ift->cstamp = now;
1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1428
1429 addrconf_dad_start(ift);
1430 in6_ifa_put(ift);
1431 in6_dev_put(idev);
1432 out:
1433 return ret;
1434 }
1435
1436
1437
1438
1439 enum {
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444 #ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1446 #endif
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
1449 IPV6_SADDR_RULE_PRIVACY,
1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1454 #endif
1455 IPV6_SADDR_RULE_MAX
1456 };
1457
1458 struct ipv6_saddr_score {
1459 int rule;
1460 int addr_type;
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1463 int scopedist;
1464 int matchlen;
1465 };
1466
1467 struct ipv6_saddr_dst {
1468 const struct in6_addr *addr;
1469 int ifindex;
1470 int scope;
1471 int label;
1472 unsigned int prefs;
1473 };
1474
1475 static inline int ipv6_saddr_preferred(int type)
1476 {
1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1478 return 1;
1479 return 0;
1480 }
1481
1482 static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
1484 {
1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1486 if (!idev)
1487 return false;
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1489 return false;
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1491 return false;
1492
1493 return true;
1494 #else
1495 return false;
1496 #endif
1497 }
1498
1499 static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1501 {
1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1503 if (!idev)
1504 return false;
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1506 return false;
1507
1508 return true;
1509 #else
1510 return false;
1511 #endif
1512 }
1513
1514 static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
1516 struct ipv6_saddr_dst *dst,
1517 int i)
1518 {
1519 int ret;
1520
1521 if (i <= score->rule) {
1522 switch (i) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1525 break;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1528 break;
1529 default:
1530 ret = !!test_bit(i, score->scorebits);
1531 }
1532 goto out;
1533 }
1534
1535 switch (i) {
1536 case IPV6_SADDR_RULE_INIT:
1537
1538 ret = !!score->ifa;
1539 break;
1540 case IPV6_SADDR_RULE_LOCAL:
1541
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1543 break;
1544 case IPV6_SADDR_RULE_SCOPE:
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1568 ret = -ret;
1569 else
1570 ret -= 128;
1571 score->scopedist = ret;
1572 break;
1573 case IPV6_SADDR_RULE_PREFERRED:
1574 {
1575
1576 u8 avoid = IFA_F_DEPRECATED;
1577
1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1579 avoid |= IFA_F_OPTIMISTIC;
1580 ret = ipv6_saddr_preferred(score->addr_type) ||
1581 !(score->ifa->flags & avoid);
1582 break;
1583 }
1584 #ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
1586 {
1587
1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1590 break;
1591 }
1592 #endif
1593 case IPV6_SADDR_RULE_OIF:
1594
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1597 break;
1598 case IPV6_SADDR_RULE_LABEL:
1599
1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
1602 score->ifa->idev->dev->ifindex) == dst->label;
1603 break;
1604 case IPV6_SADDR_RULE_PRIVACY:
1605 {
1606
1607
1608
1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1613 break;
1614 }
1615 case IPV6_SADDR_RULE_ORCHID:
1616
1617
1618
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1621 break;
1622 case IPV6_SADDR_RULE_PREFIX:
1623
1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
1628 break;
1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631
1632
1633
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1635 break;
1636 #endif
1637 default:
1638 ret = 0;
1639 }
1640
1641 if (ret)
1642 __set_bit(i, score->scorebits);
1643 score->rule = i;
1644 out:
1645 return ret;
1646 }
1647
1648 static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1652 int hiscore_idx)
1653 {
1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1655
1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1657 int i;
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1671 continue;
1672
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1674
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1678 idev->dev->name);
1679 continue;
1680 }
1681
1682 score->rule = -1;
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1684
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1687
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1690
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1694
1695
1696
1697
1698
1699
1700
1701
1702 goto out;
1703 }
1704 break;
1705 } else if (minihiscore < miniscore) {
1706 swap(hiscore, score);
1707 hiscore_idx = 1 - hiscore_idx;
1708
1709
1710 score->ifa = hiscore->ifa;
1711
1712 break;
1713 }
1714 }
1715 }
1716 out:
1717 return hiscore_idx;
1718 }
1719
1720 static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1725 int hiscore_idx)
1726 {
1727 struct inet6_dev *idev;
1728
1729 idev = __in6_dev_get(dst_dev);
1730 if (idev)
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1733
1734 idev = __in6_dev_get(master);
1735 if (idev)
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1738
1739 return hiscore_idx;
1740 }
1741
1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1743 const struct in6_addr *daddr, unsigned int prefs,
1744 struct in6_addr *saddr)
1745 {
1746 struct ipv6_saddr_score scores[2], *hiscore;
1747 struct ipv6_saddr_dst dst;
1748 struct inet6_dev *idev;
1749 struct net_device *dev;
1750 int dst_type;
1751 bool use_oif_addr = false;
1752 int hiscore_idx = 0;
1753 int ret = 0;
1754
1755 dst_type = __ipv6_addr_type(daddr);
1756 dst.addr = daddr;
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1760 dst.prefs = prefs;
1761
1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1764
1765 rcu_read_lock();
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783 if (dst_dev) {
1784 idev = __in6_dev_get(dst_dev);
1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
1788 use_oif_addr = true;
1789 }
1790 }
1791
1792 if (use_oif_addr) {
1793 if (idev)
1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1795 } else {
1796 const struct net_device *master;
1797 int master_idx = 0;
1798
1799
1800
1801
1802
1803 master = l3mdev_master_dev_rcu(dst_dev);
1804 if (master) {
1805 master_idx = master->ifindex;
1806
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1808 master, &dst,
1809 scores, hiscore_idx);
1810
1811 if (scores[hiscore_idx].ifa)
1812 goto out;
1813 }
1814
1815 for_each_netdev_rcu(net, dev) {
1816
1817
1818
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1820 continue;
1821 idev = __in6_dev_get(dev);
1822 if (!idev)
1823 continue;
1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1825 }
1826 }
1827
1828 out:
1829 hiscore = &scores[hiscore_idx];
1830 if (!hiscore->ifa)
1831 ret = -EADDRNOTAVAIL;
1832 else
1833 *saddr = hiscore->ifa->addr;
1834
1835 rcu_read_unlock();
1836 return ret;
1837 }
1838 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1839
1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1841 u32 banned_flags)
1842 {
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1845
1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1848 break;
1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1851 *addr = ifp->addr;
1852 err = 0;
1853 break;
1854 }
1855 }
1856 return err;
1857 }
1858
1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1860 u32 banned_flags)
1861 {
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1864
1865 rcu_read_lock();
1866 idev = __in6_dev_get(dev);
1867 if (idev) {
1868 read_lock_bh(&idev->lock);
1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1870 read_unlock_bh(&idev->lock);
1871 }
1872 rcu_read_unlock();
1873 return err;
1874 }
1875
1876 static int ipv6_count_addresses(const struct inet6_dev *idev)
1877 {
1878 const struct inet6_ifaddr *ifp;
1879 int cnt = 0;
1880
1881 rcu_read_lock();
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1883 cnt++;
1884 rcu_read_unlock();
1885 return cnt;
1886 }
1887
1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1889 const struct net_device *dev, int strict)
1890 {
1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
1893 }
1894 EXPORT_SYMBOL(ipv6_chk_addr);
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1906 const struct net_device *dev, bool skip_dev_check,
1907 int strict, u32 banned_flags)
1908 {
1909 unsigned int hash = inet6_addr_hash(net, addr);
1910 const struct net_device *l3mdev;
1911 struct inet6_ifaddr *ifp;
1912 u32 ifp_flags;
1913
1914 rcu_read_lock();
1915
1916 l3mdev = l3mdev_master_dev_rcu(dev);
1917 if (skip_dev_check)
1918 dev = NULL;
1919
1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1921 if (!net_eq(dev_net(ifp->idev->dev), net))
1922 continue;
1923
1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1925 continue;
1926
1927
1928
1929
1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1931 ? (ifp->flags&~IFA_F_TENTATIVE)
1932 : ifp->flags;
1933 if (ipv6_addr_equal(&ifp->addr, addr) &&
1934 !(ifp_flags&banned_flags) &&
1935 (!dev || ifp->idev->dev == dev ||
1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1937 rcu_read_unlock();
1938 return 1;
1939 }
1940 }
1941
1942 rcu_read_unlock();
1943 return 0;
1944 }
1945 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1946
1947
1948
1949
1950
1951 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1952 const unsigned int prefix_len, struct net_device *dev)
1953 {
1954 const struct inet6_ifaddr *ifa;
1955 const struct inet6_dev *idev;
1956 bool ret = false;
1957
1958 rcu_read_lock();
1959 idev = __in6_dev_get(dev);
1960 if (idev) {
1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1963 if (ret)
1964 break;
1965 }
1966 }
1967 rcu_read_unlock();
1968
1969 return ret;
1970 }
1971 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1972
1973 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1974 {
1975 const struct inet6_ifaddr *ifa;
1976 const struct inet6_dev *idev;
1977 int onlink;
1978
1979 onlink = 0;
1980 rcu_read_lock();
1981 idev = __in6_dev_get(dev);
1982 if (idev) {
1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1984 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1985 ifa->prefix_len);
1986 if (onlink)
1987 break;
1988 }
1989 }
1990 rcu_read_unlock();
1991 return onlink;
1992 }
1993 EXPORT_SYMBOL(ipv6_chk_prefix);
1994
1995 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1996 struct net_device *dev, int strict)
1997 {
1998 unsigned int hash = inet6_addr_hash(net, addr);
1999 struct inet6_ifaddr *ifp, *result = NULL;
2000
2001 rcu_read_lock();
2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2003 if (!net_eq(dev_net(ifp->idev->dev), net))
2004 continue;
2005 if (ipv6_addr_equal(&ifp->addr, addr)) {
2006 if (!dev || ifp->idev->dev == dev ||
2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2008 result = ifp;
2009 in6_ifa_hold(ifp);
2010 break;
2011 }
2012 }
2013 }
2014 rcu_read_unlock();
2015
2016 return result;
2017 }
2018
2019
2020
2021 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2022 {
2023 if (dad_failed)
2024 ifp->flags |= IFA_F_DADFAILED;
2025
2026 if (ifp->flags&IFA_F_TEMPORARY) {
2027 struct inet6_ifaddr *ifpub;
2028 spin_lock_bh(&ifp->lock);
2029 ifpub = ifp->ifpub;
2030 if (ifpub) {
2031 in6_ifa_hold(ifpub);
2032 spin_unlock_bh(&ifp->lock);
2033 ipv6_create_tempaddr(ifpub, ifp, true);
2034 in6_ifa_put(ifpub);
2035 } else {
2036 spin_unlock_bh(&ifp->lock);
2037 }
2038 ipv6_del_addr(ifp);
2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2040 spin_lock_bh(&ifp->lock);
2041 addrconf_del_dad_work(ifp);
2042 ifp->flags |= IFA_F_TENTATIVE;
2043 if (dad_failed)
2044 ifp->flags &= ~IFA_F_OPTIMISTIC;
2045 spin_unlock_bh(&ifp->lock);
2046 if (dad_failed)
2047 ipv6_ifa_notify(0, ifp);
2048 in6_ifa_put(ifp);
2049 } else {
2050 ipv6_del_addr(ifp);
2051 }
2052 }
2053
2054 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2055 {
2056 int err = -ENOENT;
2057
2058 spin_lock_bh(&ifp->lock);
2059 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2060 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2061 err = 0;
2062 }
2063 spin_unlock_bh(&ifp->lock);
2064
2065 return err;
2066 }
2067
2068 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2069 {
2070 struct inet6_dev *idev = ifp->idev;
2071 struct net *net = dev_net(ifp->idev->dev);
2072
2073 if (addrconf_dad_end(ifp)) {
2074 in6_ifa_put(ifp);
2075 return;
2076 }
2077
2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2080
2081 spin_lock_bh(&ifp->lock);
2082
2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2084 struct in6_addr new_addr;
2085 struct inet6_ifaddr *ifp2;
2086 int retries = ifp->stable_privacy_retry + 1;
2087 struct ifa6_config cfg = {
2088 .pfx = &new_addr,
2089 .plen = ifp->prefix_len,
2090 .ifa_flags = ifp->flags,
2091 .valid_lft = ifp->valid_lft,
2092 .preferred_lft = ifp->prefered_lft,
2093 .scope = ifp->scope,
2094 };
2095
2096 if (retries > net->ipv6.sysctl.idgen_retries) {
2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2098 ifp->idev->dev->name);
2099 goto errdad;
2100 }
2101
2102 new_addr = ifp->addr;
2103 if (ipv6_generate_stable_address(&new_addr, retries,
2104 idev))
2105 goto errdad;
2106
2107 spin_unlock_bh(&ifp->lock);
2108
2109 if (idev->cnf.max_addresses &&
2110 ipv6_count_addresses(idev) >=
2111 idev->cnf.max_addresses)
2112 goto lock_errdad;
2113
2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2115 ifp->idev->dev->name);
2116
2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2118 if (IS_ERR(ifp2))
2119 goto lock_errdad;
2120
2121 spin_lock_bh(&ifp2->lock);
2122 ifp2->stable_privacy_retry = retries;
2123 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2124 spin_unlock_bh(&ifp2->lock);
2125
2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2127 in6_ifa_put(ifp2);
2128 lock_errdad:
2129 spin_lock_bh(&ifp->lock);
2130 }
2131
2132 errdad:
2133
2134 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2135 spin_unlock_bh(&ifp->lock);
2136
2137 addrconf_mod_dad_work(ifp, 0);
2138 in6_ifa_put(ifp);
2139 }
2140
2141
2142
2143 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2144 {
2145 struct in6_addr maddr;
2146
2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2148 return;
2149
2150 addrconf_addr_solict_mult(addr, &maddr);
2151 ipv6_dev_mc_inc(dev, &maddr);
2152 }
2153
2154
2155 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2156 {
2157 struct in6_addr maddr;
2158
2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2160 return;
2161
2162 addrconf_addr_solict_mult(addr, &maddr);
2163 __ipv6_dev_mc_dec(idev, &maddr);
2164 }
2165
2166
2167 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2168 {
2169 struct in6_addr addr;
2170
2171 if (ifp->prefix_len >= 127)
2172 return;
2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2174 if (ipv6_addr_any(&addr))
2175 return;
2176 __ipv6_dev_ac_inc(ifp->idev, &addr);
2177 }
2178
2179
2180 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2181 {
2182 struct in6_addr addr;
2183
2184 if (ifp->prefix_len >= 127)
2185 return;
2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2187 if (ipv6_addr_any(&addr))
2188 return;
2189 __ipv6_dev_ac_dec(ifp->idev, &addr);
2190 }
2191
2192 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2193 {
2194 switch (dev->addr_len) {
2195 case ETH_ALEN:
2196 memcpy(eui, dev->dev_addr, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 memcpy(eui + 5, dev->dev_addr + 3, 3);
2200 break;
2201 case EUI64_ADDR_LEN:
2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2203 eui[0] ^= 2;
2204 break;
2205 default:
2206 return -1;
2207 }
2208
2209 return 0;
2210 }
2211
2212 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2213 {
2214 union fwnet_hwaddr *ha;
2215
2216 if (dev->addr_len != FWNET_ALEN)
2217 return -1;
2218
2219 ha = (union fwnet_hwaddr *)dev->dev_addr;
2220
2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2222 eui[0] ^= 2;
2223 return 0;
2224 }
2225
2226 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2227 {
2228
2229 if (dev->addr_len != ARCNET_ALEN)
2230 return -1;
2231 memset(eui, 0, 7);
2232 eui[7] = *(u8 *)dev->dev_addr;
2233 return 0;
2234 }
2235
2236 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2237 {
2238 if (dev->addr_len != INFINIBAND_ALEN)
2239 return -1;
2240 memcpy(eui, dev->dev_addr + 12, 8);
2241 eui[0] |= 2;
2242 return 0;
2243 }
2244
2245 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2246 {
2247 if (addr == 0)
2248 return -1;
2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2255 eui[1] = 0;
2256 eui[2] = 0x5E;
2257 eui[3] = 0xFE;
2258 memcpy(eui + 4, &addr, 4);
2259 return 0;
2260 }
2261
2262 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2263 {
2264 if (dev->priv_flags & IFF_ISATAP)
2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2266 return -1;
2267 }
2268
2269 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2270 {
2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2272 }
2273
2274 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2275 {
2276 memcpy(eui, dev->perm_addr, 3);
2277 memcpy(eui + 5, dev->perm_addr + 3, 3);
2278 eui[3] = 0xFF;
2279 eui[4] = 0xFE;
2280 eui[0] ^= 2;
2281 return 0;
2282 }
2283
2284 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2285 {
2286 switch (dev->type) {
2287 case ARPHRD_ETHER:
2288 case ARPHRD_FDDI:
2289 return addrconf_ifid_eui48(eui, dev);
2290 case ARPHRD_ARCNET:
2291 return addrconf_ifid_arcnet(eui, dev);
2292 case ARPHRD_INFINIBAND:
2293 return addrconf_ifid_infiniband(eui, dev);
2294 case ARPHRD_SIT:
2295 return addrconf_ifid_sit(eui, dev);
2296 case ARPHRD_IPGRE:
2297 case ARPHRD_TUNNEL:
2298 return addrconf_ifid_gre(eui, dev);
2299 case ARPHRD_6LOWPAN:
2300 return addrconf_ifid_6lowpan(eui, dev);
2301 case ARPHRD_IEEE1394:
2302 return addrconf_ifid_ieee1394(eui, dev);
2303 case ARPHRD_TUNNEL6:
2304 case ARPHRD_IP6GRE:
2305 case ARPHRD_RAWIP:
2306 return addrconf_ifid_ip6tnl(eui, dev);
2307 }
2308 return -1;
2309 }
2310
2311 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2312 {
2313 int err = -1;
2314 struct inet6_ifaddr *ifp;
2315
2316 read_lock_bh(&idev->lock);
2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2318 if (ifp->scope > IFA_LINK)
2319 break;
2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2321 memcpy(eui, ifp->addr.s6_addr+8, 8);
2322 err = 0;
2323 break;
2324 }
2325 }
2326 read_unlock_bh(&idev->lock);
2327 return err;
2328 }
2329
2330
2331 static void ipv6_regen_rndid(struct inet6_dev *idev)
2332 {
2333 regen:
2334 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2335 idev->rndid[0] &= ~0x02;
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348 if (idev->rndid[0] == 0xfd &&
2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2350 (idev->rndid[7]&0x80))
2351 goto regen;
2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2354 goto regen;
2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2356 goto regen;
2357 }
2358 }
2359
2360 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2361 {
2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2363 ipv6_regen_rndid(idev);
2364 }
2365
2366
2367
2368
2369
2370 static void
2371 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2372 struct net_device *dev, unsigned long expires,
2373 u32 flags, gfp_t gfp_flags)
2374 {
2375 struct fib6_config cfg = {
2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2378 .fc_ifindex = dev->ifindex,
2379 .fc_expires = expires,
2380 .fc_dst_len = plen,
2381 .fc_flags = RTF_UP | flags,
2382 .fc_nlinfo.nl_net = dev_net(dev),
2383 .fc_protocol = RTPROT_KERNEL,
2384 .fc_type = RTN_UNICAST,
2385 };
2386
2387 cfg.fc_dst = *pfx;
2388
2389
2390
2391
2392
2393 #if IS_ENABLED(CONFIG_IPV6_SIT)
2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2395 cfg.fc_flags |= RTF_NONEXTHOP;
2396 #endif
2397
2398 ip6_route_add(&cfg, gfp_flags, NULL);
2399 }
2400
2401
2402 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2403 int plen,
2404 const struct net_device *dev,
2405 u32 flags, u32 noflags,
2406 bool no_gw)
2407 {
2408 struct fib6_node *fn;
2409 struct fib6_info *rt = NULL;
2410 struct fib6_table *table;
2411 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2412
2413 table = fib6_get_table(dev_net(dev), tb_id);
2414 if (!table)
2415 return NULL;
2416
2417 rcu_read_lock();
2418 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2419 if (!fn)
2420 goto out;
2421
2422 for_each_fib6_node_rt_rcu(fn) {
2423
2424 if (rt->nh)
2425 continue;
2426
2427 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2428 continue;
2429 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2430 continue;
2431 if ((rt->fib6_flags & flags) != flags)
2432 continue;
2433 if ((rt->fib6_flags & noflags) != 0)
2434 continue;
2435 if (!fib6_info_hold_safe(rt))
2436 continue;
2437 break;
2438 }
2439 out:
2440 rcu_read_unlock();
2441 return rt;
2442 }
2443
2444
2445
2446
2447 static void addrconf_add_mroute(struct net_device *dev)
2448 {
2449 struct fib6_config cfg = {
2450 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2451 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2452 .fc_ifindex = dev->ifindex,
2453 .fc_dst_len = 8,
2454 .fc_flags = RTF_UP,
2455 .fc_type = RTN_UNICAST,
2456 .fc_nlinfo.nl_net = dev_net(dev),
2457 };
2458
2459 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2460
2461 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2462 }
2463
2464 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2465 {
2466 struct inet6_dev *idev;
2467
2468 ASSERT_RTNL();
2469
2470 idev = ipv6_find_idev(dev);
2471 if (IS_ERR(idev))
2472 return idev;
2473
2474 if (idev->cnf.disable_ipv6)
2475 return ERR_PTR(-EACCES);
2476
2477
2478 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2479 addrconf_add_mroute(dev);
2480
2481 return idev;
2482 }
2483
2484 static void manage_tempaddrs(struct inet6_dev *idev,
2485 struct inet6_ifaddr *ifp,
2486 __u32 valid_lft, __u32 prefered_lft,
2487 bool create, unsigned long now)
2488 {
2489 u32 flags;
2490 struct inet6_ifaddr *ift;
2491
2492 read_lock_bh(&idev->lock);
2493
2494 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2495 int age, max_valid, max_prefered;
2496
2497 if (ifp != ift->ifpub)
2498 continue;
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508 age = (now - ift->cstamp) / HZ;
2509 max_valid = idev->cnf.temp_valid_lft - age;
2510 if (max_valid < 0)
2511 max_valid = 0;
2512
2513 max_prefered = idev->cnf.temp_prefered_lft -
2514 idev->desync_factor - age;
2515 if (max_prefered < 0)
2516 max_prefered = 0;
2517
2518 if (valid_lft > max_valid)
2519 valid_lft = max_valid;
2520
2521 if (prefered_lft > max_prefered)
2522 prefered_lft = max_prefered;
2523
2524 spin_lock(&ift->lock);
2525 flags = ift->flags;
2526 ift->valid_lft = valid_lft;
2527 ift->prefered_lft = prefered_lft;
2528 ift->tstamp = now;
2529 if (prefered_lft > 0)
2530 ift->flags &= ~IFA_F_DEPRECATED;
2531
2532 spin_unlock(&ift->lock);
2533 if (!(flags&IFA_F_TENTATIVE))
2534 ipv6_ifa_notify(0, ift);
2535 }
2536
2537 if ((create || list_empty(&idev->tempaddr_list)) &&
2538 idev->cnf.use_tempaddr > 0) {
2539
2540
2541
2542
2543
2544 read_unlock_bh(&idev->lock);
2545 ipv6_create_tempaddr(ifp, NULL, false);
2546 } else {
2547 read_unlock_bh(&idev->lock);
2548 }
2549 }
2550
2551 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2552 {
2553 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2554 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2555 }
2556
2557 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2558 const struct prefix_info *pinfo,
2559 struct inet6_dev *in6_dev,
2560 const struct in6_addr *addr, int addr_type,
2561 u32 addr_flags, bool sllao, bool tokenized,
2562 __u32 valid_lft, u32 prefered_lft)
2563 {
2564 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2565 int create = 0, update_lft = 0;
2566
2567 if (!ifp && valid_lft) {
2568 int max_addresses = in6_dev->cnf.max_addresses;
2569 struct ifa6_config cfg = {
2570 .pfx = addr,
2571 .plen = pinfo->prefix_len,
2572 .ifa_flags = addr_flags,
2573 .valid_lft = valid_lft,
2574 .preferred_lft = prefered_lft,
2575 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2576 };
2577
2578 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2579 if ((net->ipv6.devconf_all->optimistic_dad ||
2580 in6_dev->cnf.optimistic_dad) &&
2581 !net->ipv6.devconf_all->forwarding && sllao)
2582 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2583 #endif
2584
2585
2586
2587
2588 if (!max_addresses ||
2589 ipv6_count_addresses(in6_dev) < max_addresses)
2590 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2591
2592 if (IS_ERR_OR_NULL(ifp))
2593 return -1;
2594
2595 create = 1;
2596 spin_lock_bh(&ifp->lock);
2597 ifp->flags |= IFA_F_MANAGETEMPADDR;
2598 ifp->cstamp = jiffies;
2599 ifp->tokenized = tokenized;
2600 spin_unlock_bh(&ifp->lock);
2601 addrconf_dad_start(ifp);
2602 }
2603
2604 if (ifp) {
2605 u32 flags;
2606 unsigned long now;
2607 u32 stored_lft;
2608
2609
2610 spin_lock_bh(&ifp->lock);
2611 now = jiffies;
2612 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2613 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2614 else
2615 stored_lft = 0;
2616 if (!create && stored_lft) {
2617 const u32 minimum_lft = min_t(u32,
2618 stored_lft, MIN_VALID_LIFETIME);
2619 valid_lft = max(valid_lft, minimum_lft);
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631 update_lft = 1;
2632 }
2633
2634 if (update_lft) {
2635 ifp->valid_lft = valid_lft;
2636 ifp->prefered_lft = prefered_lft;
2637 ifp->tstamp = now;
2638 flags = ifp->flags;
2639 ifp->flags &= ~IFA_F_DEPRECATED;
2640 spin_unlock_bh(&ifp->lock);
2641
2642 if (!(flags&IFA_F_TENTATIVE))
2643 ipv6_ifa_notify(0, ifp);
2644 } else
2645 spin_unlock_bh(&ifp->lock);
2646
2647 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2648 create, now);
2649
2650 in6_ifa_put(ifp);
2651 addrconf_verify();
2652 }
2653
2654 return 0;
2655 }
2656 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2657
2658 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2659 {
2660 struct prefix_info *pinfo;
2661 __u32 valid_lft;
2662 __u32 prefered_lft;
2663 int addr_type, err;
2664 u32 addr_flags = 0;
2665 struct inet6_dev *in6_dev;
2666 struct net *net = dev_net(dev);
2667
2668 pinfo = (struct prefix_info *) opt;
2669
2670 if (len < sizeof(struct prefix_info)) {
2671 netdev_dbg(dev, "addrconf: prefix option too short\n");
2672 return;
2673 }
2674
2675
2676
2677
2678
2679 addr_type = ipv6_addr_type(&pinfo->prefix);
2680
2681 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2682 return;
2683
2684 valid_lft = ntohl(pinfo->valid);
2685 prefered_lft = ntohl(pinfo->prefered);
2686
2687 if (prefered_lft > valid_lft) {
2688 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2689 return;
2690 }
2691
2692 in6_dev = in6_dev_get(dev);
2693
2694 if (!in6_dev) {
2695 net_dbg_ratelimited("addrconf: device %s not configured\n",
2696 dev->name);
2697 return;
2698 }
2699
2700
2701
2702
2703
2704
2705
2706 if (pinfo->onlink) {
2707 struct fib6_info *rt;
2708 unsigned long rt_expires;
2709
2710
2711
2712
2713
2714
2715 if (HZ > USER_HZ)
2716 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2717 else
2718 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2719
2720 if (addrconf_finite_timeout(rt_expires))
2721 rt_expires *= HZ;
2722
2723 rt = addrconf_get_prefix_route(&pinfo->prefix,
2724 pinfo->prefix_len,
2725 dev,
2726 RTF_ADDRCONF | RTF_PREFIX_RT,
2727 RTF_DEFAULT, true);
2728
2729 if (rt) {
2730
2731 if (valid_lft == 0) {
2732 ip6_del_rt(net, rt);
2733 rt = NULL;
2734 } else if (addrconf_finite_timeout(rt_expires)) {
2735
2736 fib6_set_expires(rt, jiffies + rt_expires);
2737 } else {
2738 fib6_clean_expires(rt);
2739 }
2740 } else if (valid_lft) {
2741 clock_t expires = 0;
2742 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2743 if (addrconf_finite_timeout(rt_expires)) {
2744
2745 flags |= RTF_EXPIRES;
2746 expires = jiffies_to_clock_t(rt_expires);
2747 }
2748 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2749 0, dev, expires, flags,
2750 GFP_ATOMIC);
2751 }
2752 fib6_info_release(rt);
2753 }
2754
2755
2756
2757 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2758 struct in6_addr addr;
2759 bool tokenized = false, dev_addr_generated = false;
2760
2761 if (pinfo->prefix_len == 64) {
2762 memcpy(&addr, &pinfo->prefix, 8);
2763
2764 if (!ipv6_addr_any(&in6_dev->token)) {
2765 read_lock_bh(&in6_dev->lock);
2766 memcpy(addr.s6_addr + 8,
2767 in6_dev->token.s6_addr + 8, 8);
2768 read_unlock_bh(&in6_dev->lock);
2769 tokenized = true;
2770 } else if (is_addr_mode_generate_stable(in6_dev) &&
2771 !ipv6_generate_stable_address(&addr, 0,
2772 in6_dev)) {
2773 addr_flags |= IFA_F_STABLE_PRIVACY;
2774 goto ok;
2775 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2776 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2777 goto put;
2778 } else {
2779 dev_addr_generated = true;
2780 }
2781 goto ok;
2782 }
2783 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2784 pinfo->prefix_len);
2785 goto put;
2786
2787 ok:
2788 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2789 &addr, addr_type,
2790 addr_flags, sllao,
2791 tokenized, valid_lft,
2792 prefered_lft);
2793 if (err)
2794 goto put;
2795
2796
2797
2798
2799 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2800 addr_type, addr_flags, sllao,
2801 tokenized, valid_lft,
2802 prefered_lft,
2803 dev_addr_generated);
2804 }
2805 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2806 put:
2807 in6_dev_put(in6_dev);
2808 }
2809
2810
2811
2812
2813
2814
2815 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2816 {
2817 struct in6_ifreq ireq;
2818 struct net_device *dev;
2819 int err = -EINVAL;
2820
2821 rtnl_lock();
2822
2823 err = -EFAULT;
2824 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2825 goto err_exit;
2826
2827 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2828
2829 err = -ENODEV;
2830 if (!dev)
2831 goto err_exit;
2832
2833 #if IS_ENABLED(CONFIG_IPV6_SIT)
2834 if (dev->type == ARPHRD_SIT) {
2835 const struct net_device_ops *ops = dev->netdev_ops;
2836 struct ifreq ifr;
2837 struct ip_tunnel_parm p;
2838
2839 err = -EADDRNOTAVAIL;
2840 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2841 goto err_exit;
2842
2843 memset(&p, 0, sizeof(p));
2844 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2845 p.iph.saddr = 0;
2846 p.iph.version = 4;
2847 p.iph.ihl = 5;
2848 p.iph.protocol = IPPROTO_IPV6;
2849 p.iph.ttl = 64;
2850 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2851
2852 if (ops->ndo_do_ioctl) {
2853 mm_segment_t oldfs = get_fs();
2854
2855 set_fs(KERNEL_DS);
2856 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2857 set_fs(oldfs);
2858 } else
2859 err = -EOPNOTSUPP;
2860
2861 if (err == 0) {
2862 err = -ENOBUFS;
2863 dev = __dev_get_by_name(net, p.name);
2864 if (!dev)
2865 goto err_exit;
2866 err = dev_open(dev, NULL);
2867 }
2868 }
2869 #endif
2870
2871 err_exit:
2872 rtnl_unlock();
2873 return err;
2874 }
2875
2876 static int ipv6_mc_config(struct sock *sk, bool join,
2877 const struct in6_addr *addr, int ifindex)
2878 {
2879 int ret;
2880
2881 ASSERT_RTNL();
2882
2883 lock_sock(sk);
2884 if (join)
2885 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2886 else
2887 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2888 release_sock(sk);
2889
2890 return ret;
2891 }
2892
2893
2894
2895
2896 static int inet6_addr_add(struct net *net, int ifindex,
2897 struct ifa6_config *cfg,
2898 struct netlink_ext_ack *extack)
2899 {
2900 struct inet6_ifaddr *ifp;
2901 struct inet6_dev *idev;
2902 struct net_device *dev;
2903 unsigned long timeout;
2904 clock_t expires;
2905 u32 flags;
2906
2907 ASSERT_RTNL();
2908
2909 if (cfg->plen > 128)
2910 return -EINVAL;
2911
2912
2913 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2914 return -EINVAL;
2915
2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2917 return -EINVAL;
2918
2919 dev = __dev_get_by_index(net, ifindex);
2920 if (!dev)
2921 return -ENODEV;
2922
2923 idev = addrconf_add_dev(dev);
2924 if (IS_ERR(idev))
2925 return PTR_ERR(idev);
2926
2927 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2928 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2929 true, cfg->pfx, ifindex);
2930
2931 if (ret < 0)
2932 return ret;
2933 }
2934
2935 cfg->scope = ipv6_addr_scope(cfg->pfx);
2936
2937 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2938 if (addrconf_finite_timeout(timeout)) {
2939 expires = jiffies_to_clock_t(timeout * HZ);
2940 cfg->valid_lft = timeout;
2941 flags = RTF_EXPIRES;
2942 } else {
2943 expires = 0;
2944 flags = 0;
2945 cfg->ifa_flags |= IFA_F_PERMANENT;
2946 }
2947
2948 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2949 if (addrconf_finite_timeout(timeout)) {
2950 if (timeout == 0)
2951 cfg->ifa_flags |= IFA_F_DEPRECATED;
2952 cfg->preferred_lft = timeout;
2953 }
2954
2955 ifp = ipv6_add_addr(idev, cfg, true, extack);
2956 if (!IS_ERR(ifp)) {
2957 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2959 ifp->rt_priority, dev, expires,
2960 flags, GFP_KERNEL);
2961 }
2962
2963
2964
2965
2966 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2967 ipv6_ifa_notify(0, ifp);
2968
2969
2970
2971
2972
2973 addrconf_dad_start(ifp);
2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2975 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2976 cfg->preferred_lft, true, jiffies);
2977 in6_ifa_put(ifp);
2978 addrconf_verify_rtnl();
2979 return 0;
2980 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2982 cfg->pfx, ifindex);
2983 }
2984
2985 return PTR_ERR(ifp);
2986 }
2987
2988 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2989 const struct in6_addr *pfx, unsigned int plen)
2990 {
2991 struct inet6_ifaddr *ifp;
2992 struct inet6_dev *idev;
2993 struct net_device *dev;
2994
2995 if (plen > 128)
2996 return -EINVAL;
2997
2998 dev = __dev_get_by_index(net, ifindex);
2999 if (!dev)
3000 return -ENODEV;
3001
3002 idev = __in6_dev_get(dev);
3003 if (!idev)
3004 return -ENXIO;
3005
3006 read_lock_bh(&idev->lock);
3007 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3008 if (ifp->prefix_len == plen &&
3009 ipv6_addr_equal(pfx, &ifp->addr)) {
3010 in6_ifa_hold(ifp);
3011 read_unlock_bh(&idev->lock);
3012
3013 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3014 (ifa_flags & IFA_F_MANAGETEMPADDR))
3015 manage_tempaddrs(idev, ifp, 0, 0, false,
3016 jiffies);
3017 ipv6_del_addr(ifp);
3018 addrconf_verify_rtnl();
3019 if (ipv6_addr_is_multicast(pfx)) {
3020 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3021 false, pfx, dev->ifindex);
3022 }
3023 return 0;
3024 }
3025 }
3026 read_unlock_bh(&idev->lock);
3027 return -EADDRNOTAVAIL;
3028 }
3029
3030
3031 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3032 {
3033 struct ifa6_config cfg = {
3034 .ifa_flags = IFA_F_PERMANENT,
3035 .preferred_lft = INFINITY_LIFE_TIME,
3036 .valid_lft = INFINITY_LIFE_TIME,
3037 };
3038 struct in6_ifreq ireq;
3039 int err;
3040
3041 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3042 return -EPERM;
3043
3044 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3045 return -EFAULT;
3046
3047 cfg.pfx = &ireq.ifr6_addr;
3048 cfg.plen = ireq.ifr6_prefixlen;
3049
3050 rtnl_lock();
3051 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3052 rtnl_unlock();
3053 return err;
3054 }
3055
3056 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3057 {
3058 struct in6_ifreq ireq;
3059 int err;
3060
3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3062 return -EPERM;
3063
3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3065 return -EFAULT;
3066
3067 rtnl_lock();
3068 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3069 ireq.ifr6_prefixlen);
3070 rtnl_unlock();
3071 return err;
3072 }
3073
3074 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3075 int plen, int scope)
3076 {
3077 struct inet6_ifaddr *ifp;
3078 struct ifa6_config cfg = {
3079 .pfx = addr,
3080 .plen = plen,
3081 .ifa_flags = IFA_F_PERMANENT,
3082 .valid_lft = INFINITY_LIFE_TIME,
3083 .preferred_lft = INFINITY_LIFE_TIME,
3084 .scope = scope
3085 };
3086
3087 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3088 if (!IS_ERR(ifp)) {
3089 spin_lock_bh(&ifp->lock);
3090 ifp->flags &= ~IFA_F_TENTATIVE;
3091 spin_unlock_bh(&ifp->lock);
3092 rt_genid_bump_ipv6(dev_net(idev->dev));
3093 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3094 in6_ifa_put(ifp);
3095 }
3096 }
3097
3098 #if IS_ENABLED(CONFIG_IPV6_SIT)
3099 static void sit_add_v4_addrs(struct inet6_dev *idev)
3100 {
3101 struct in6_addr addr;
3102 struct net_device *dev;
3103 struct net *net = dev_net(idev->dev);
3104 int scope, plen;
3105 u32 pflags = 0;
3106
3107 ASSERT_RTNL();
3108
3109 memset(&addr, 0, sizeof(struct in6_addr));
3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3111
3112 if (idev->dev->flags&IFF_POINTOPOINT) {
3113 addr.s6_addr32[0] = htonl(0xfe800000);
3114 scope = IFA_LINK;
3115 plen = 64;
3116 } else {
3117 scope = IPV6_ADDR_COMPATv4;
3118 plen = 96;
3119 pflags |= RTF_NONEXTHOP;
3120 }
3121
3122 if (addr.s6_addr32[3]) {
3123 add_addr(idev, &addr, plen, scope);
3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3125 GFP_KERNEL);
3126 return;
3127 }
3128
3129 for_each_netdev(net, dev) {
3130 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3131 if (in_dev && (dev->flags & IFF_UP)) {
3132 struct in_ifaddr *ifa;
3133 int flag = scope;
3134
3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3136 addr.s6_addr32[3] = ifa->ifa_local;
3137
3138 if (ifa->ifa_scope == RT_SCOPE_LINK)
3139 continue;
3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3141 if (idev->dev->flags&IFF_POINTOPOINT)
3142 continue;
3143 flag |= IFA_HOST;
3144 }
3145
3146 add_addr(idev, &addr, plen, flag);
3147 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3148 0, pflags, GFP_KERNEL);
3149 }
3150 }
3151 }
3152 }
3153 #endif
3154
3155 static void init_loopback(struct net_device *dev)
3156 {
3157 struct inet6_dev *idev;
3158
3159
3160
3161 ASSERT_RTNL();
3162
3163 idev = ipv6_find_idev(dev);
3164 if (IS_ERR(idev)) {
3165 pr_debug("%s: add_dev failed\n", __func__);
3166 return;
3167 }
3168
3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3170 }
3171
3172 void addrconf_add_linklocal(struct inet6_dev *idev,
3173 const struct in6_addr *addr, u32 flags)
3174 {
3175 struct ifa6_config cfg = {
3176 .pfx = addr,
3177 .plen = 64,
3178 .ifa_flags = flags | IFA_F_PERMANENT,
3179 .valid_lft = INFINITY_LIFE_TIME,
3180 .preferred_lft = INFINITY_LIFE_TIME,
3181 .scope = IFA_LINK
3182 };
3183 struct inet6_ifaddr *ifp;
3184
3185 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3187 idev->cnf.optimistic_dad) &&
3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3190 #endif
3191
3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3193 if (!IS_ERR(ifp)) {
3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3195 0, 0, GFP_ATOMIC);
3196 addrconf_dad_start(ifp);
3197 in6_ifa_put(ifp);
3198 }
3199 }
3200 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3201
3202 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3203 {
3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3205 return true;
3206
3207 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3209 return true;
3210
3211 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3213 return true;
3214
3215 return false;
3216 }
3217
3218 static int ipv6_generate_stable_address(struct in6_addr *address,
3219 u8 dad_count,
3220 const struct inet6_dev *idev)
3221 {
3222 static DEFINE_SPINLOCK(lock);
3223 static __u32 digest[SHA_DIGEST_WORDS];
3224 static __u32 workspace[SHA_WORKSPACE_WORDS];
3225
3226 static union {
3227 char __data[SHA_MESSAGE_BYTES];
3228 struct {
3229 struct in6_addr secret;
3230 __be32 prefix[2];
3231 unsigned char hwaddr[MAX_ADDR_LEN];
3232 u8 dad_count;
3233 } __packed;
3234 } data;
3235
3236 struct in6_addr secret;
3237 struct in6_addr temp;
3238 struct net *net = dev_net(idev->dev);
3239
3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3241
3242 if (idev->cnf.stable_secret.initialized)
3243 secret = idev->cnf.stable_secret.secret;
3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3245 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3246 else
3247 return -1;
3248
3249 retry:
3250 spin_lock_bh(&lock);
3251
3252 sha_init(digest);
3253 memset(&data, 0, sizeof(data));
3254 memset(workspace, 0, sizeof(workspace));
3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3256 data.prefix[0] = address->s6_addr32[0];
3257 data.prefix[1] = address->s6_addr32[1];
3258 data.secret = secret;
3259 data.dad_count = dad_count;
3260
3261 sha_transform(digest, data.__data, workspace);
3262
3263 temp = *address;
3264 temp.s6_addr32[2] = (__force __be32)digest[0];
3265 temp.s6_addr32[3] = (__force __be32)digest[1];
3266
3267 spin_unlock_bh(&lock);
3268
3269 if (ipv6_reserved_interfaceid(temp)) {
3270 dad_count++;
3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3272 return -1;
3273 goto retry;
3274 }
3275
3276 *address = temp;
3277 return 0;
3278 }
3279
3280 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3281 {
3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3283
3284 if (s->initialized)
3285 return;
3286 s = &idev->cnf.stable_secret;
3287 get_random_bytes(&s->secret, sizeof(s->secret));
3288 s->initialized = true;
3289 }
3290
3291 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3292 {
3293 struct in6_addr addr;
3294
3295
3296 if (netif_is_l3_master(idev->dev))
3297 return;
3298
3299
3300 if (idev->dev->flags & IFF_SLAVE)
3301 return;
3302
3303 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3304
3305 switch (idev->cnf.addr_gen_mode) {
3306 case IN6_ADDR_GEN_MODE_RANDOM:
3307 ipv6_gen_mode_random_init(idev);
3308
3309 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3310 if (!ipv6_generate_stable_address(&addr, 0, idev))
3311 addrconf_add_linklocal(idev, &addr,
3312 IFA_F_STABLE_PRIVACY);
3313 else if (prefix_route)
3314 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3315 0, 0, GFP_KERNEL);
3316 break;
3317 case IN6_ADDR_GEN_MODE_EUI64:
3318
3319
3320
3321
3322 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3323 addrconf_add_linklocal(idev, &addr, 0);
3324 else if (prefix_route)
3325 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3326 0, 0, GFP_KERNEL);
3327 break;
3328 case IN6_ADDR_GEN_MODE_NONE:
3329 default:
3330
3331 break;
3332 }
3333 }
3334
3335 static void addrconf_dev_config(struct net_device *dev)
3336 {
3337 struct inet6_dev *idev;
3338
3339 ASSERT_RTNL();
3340
3341 if ((dev->type != ARPHRD_ETHER) &&
3342 (dev->type != ARPHRD_FDDI) &&
3343 (dev->type != ARPHRD_ARCNET) &&
3344 (dev->type != ARPHRD_INFINIBAND) &&
3345 (dev->type != ARPHRD_IEEE1394) &&
3346 (dev->type != ARPHRD_TUNNEL6) &&
3347 (dev->type != ARPHRD_6LOWPAN) &&
3348 (dev->type != ARPHRD_IP6GRE) &&
3349 (dev->type != ARPHRD_IPGRE) &&
3350 (dev->type != ARPHRD_TUNNEL) &&
3351 (dev->type != ARPHRD_NONE) &&
3352 (dev->type != ARPHRD_RAWIP)) {
3353
3354 idev = __in6_dev_get(dev);
3355 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3356 dev->flags & IFF_MULTICAST)
3357 ipv6_mc_up(idev);
3358 return;
3359 }
3360
3361 idev = addrconf_add_dev(dev);
3362 if (IS_ERR(idev))
3363 return;
3364
3365
3366 if (dev->type == ARPHRD_NONE &&
3367 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3368 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3369
3370 addrconf_addr_gen(idev, false);
3371 }
3372
3373 #if IS_ENABLED(CONFIG_IPV6_SIT)
3374 static void addrconf_sit_config(struct net_device *dev)
3375 {
3376 struct inet6_dev *idev;
3377
3378 ASSERT_RTNL();
3379
3380
3381
3382
3383
3384
3385
3386 idev = ipv6_find_idev(dev);
3387 if (IS_ERR(idev)) {
3388 pr_debug("%s: add_dev failed\n", __func__);
3389 return;
3390 }
3391
3392 if (dev->priv_flags & IFF_ISATAP) {
3393 addrconf_addr_gen(idev, false);
3394 return;
3395 }
3396
3397 sit_add_v4_addrs(idev);
3398
3399 if (dev->flags&IFF_POINTOPOINT)
3400 addrconf_add_mroute(dev);
3401 }
3402 #endif
3403
3404 #if IS_ENABLED(CONFIG_NET_IPGRE)
3405 static void addrconf_gre_config(struct net_device *dev)
3406 {
3407 struct inet6_dev *idev;
3408
3409 ASSERT_RTNL();
3410
3411 idev = ipv6_find_idev(dev);
3412 if (IS_ERR(idev)) {
3413 pr_debug("%s: add_dev failed\n", __func__);
3414 return;
3415 }
3416
3417 addrconf_addr_gen(idev, true);
3418 if (dev->flags & IFF_POINTOPOINT)
3419 addrconf_add_mroute(dev);
3420 }
3421 #endif
3422
3423 static int fixup_permanent_addr(struct net *net,
3424 struct inet6_dev *idev,
3425 struct inet6_ifaddr *ifp)
3426 {
3427
3428
3429
3430
3431 if (!ifp->rt || !ifp->rt->fib6_node) {
3432 struct fib6_info *f6i, *prev;
3433
3434 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3435 GFP_ATOMIC);
3436 if (IS_ERR(f6i))
3437 return PTR_ERR(f6i);
3438
3439
3440 spin_lock(&ifp->lock);
3441 prev = ifp->rt;
3442 ifp->rt = f6i;
3443 spin_unlock(&ifp->lock);
3444
3445 fib6_info_release(prev);
3446 }
3447
3448 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3449 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3450 ifp->rt_priority, idev->dev, 0, 0,
3451 GFP_ATOMIC);
3452 }
3453
3454 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3455 addrconf_dad_start(ifp);
3456
3457 return 0;
3458 }
3459
3460 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3461 {
3462 struct inet6_ifaddr *ifp, *tmp;
3463 struct inet6_dev *idev;
3464
3465 idev = __in6_dev_get(dev);
3466 if (!idev)
3467 return;
3468
3469 write_lock_bh(&idev->lock);
3470
3471 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3472 if ((ifp->flags & IFA_F_PERMANENT) &&
3473 fixup_permanent_addr(net, idev, ifp) < 0) {
3474 write_unlock_bh(&idev->lock);
3475 in6_ifa_hold(ifp);
3476 ipv6_del_addr(ifp);
3477 write_lock_bh(&idev->lock);
3478
3479 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3480 idev->dev->name, &ifp->addr);
3481 }
3482 }
3483
3484 write_unlock_bh(&idev->lock);
3485 }
3486
3487 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3488 void *ptr)
3489 {
3490 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3491 struct netdev_notifier_change_info *change_info;
3492 struct netdev_notifier_changeupper_info *info;
3493 struct inet6_dev *idev = __in6_dev_get(dev);
3494 struct net *net = dev_net(dev);
3495 int run_pending = 0;
3496 int err;
3497
3498 switch (event) {
3499 case NETDEV_REGISTER:
3500 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3501 idev = ipv6_add_dev(dev);
3502 if (IS_ERR(idev))
3503 return notifier_from_errno(PTR_ERR(idev));
3504 }
3505 break;
3506
3507 case NETDEV_CHANGEMTU:
3508
3509 if (dev->mtu < IPV6_MIN_MTU) {
3510 addrconf_ifdown(dev, dev != net->loopback_dev);
3511 break;
3512 }
3513
3514 if (idev) {
3515 rt6_mtu_change(dev, dev->mtu);
3516 idev->cnf.mtu6 = dev->mtu;
3517 break;
3518 }
3519
3520
3521 idev = ipv6_add_dev(dev);
3522 if (IS_ERR(idev))
3523 break;
3524
3525
3526 if (!(idev->if_flags & IF_READY))
3527 break;
3528
3529 run_pending = 1;
3530
3531
3532
3533 case NETDEV_UP:
3534 case NETDEV_CHANGE:
3535 if (dev->flags & IFF_SLAVE)
3536 break;
3537
3538 if (idev && idev->cnf.disable_ipv6)
3539 break;
3540
3541 if (event == NETDEV_UP) {
3542
3543 addrconf_permanent_addr(net, dev);
3544
3545 if (!addrconf_link_ready(dev)) {
3546
3547 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3548 dev->name);
3549 break;
3550 }
3551
3552 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3553 idev = ipv6_add_dev(dev);
3554
3555 if (!IS_ERR_OR_NULL(idev)) {
3556 idev->if_flags |= IF_READY;
3557 run_pending = 1;
3558 }
3559 } else if (event == NETDEV_CHANGE) {
3560 if (!addrconf_link_ready(dev)) {
3561
3562 rt6_sync_down_dev(dev, event);
3563 break;
3564 }
3565
3566 if (!IS_ERR_OR_NULL(idev)) {
3567 if (idev->if_flags & IF_READY) {
3568
3569
3570
3571
3572
3573 ipv6_mc_up(idev);
3574 change_info = ptr;
3575 if (change_info->flags_changed & IFF_NOARP)
3576 addrconf_dad_run(idev, true);
3577 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3578 break;
3579 }
3580 idev->if_flags |= IF_READY;
3581 }
3582
3583 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3584 dev->name);
3585
3586 run_pending = 1;
3587 }
3588
3589 switch (dev->type) {
3590 #if IS_ENABLED(CONFIG_IPV6_SIT)
3591 case ARPHRD_SIT:
3592 addrconf_sit_config(dev);
3593 break;
3594 #endif
3595 #if IS_ENABLED(CONFIG_NET_IPGRE)
3596 case ARPHRD_IPGRE:
3597 addrconf_gre_config(dev);
3598 break;
3599 #endif
3600 case ARPHRD_LOOPBACK:
3601 init_loopback(dev);
3602 break;
3603
3604 default:
3605 addrconf_dev_config(dev);
3606 break;
3607 }
3608
3609 if (!IS_ERR_OR_NULL(idev)) {
3610 if (run_pending)
3611 addrconf_dad_run(idev, false);
3612
3613
3614 rt6_sync_up(dev, RTNH_F_DEAD);
3615
3616
3617
3618
3619
3620
3621 if (idev->cnf.mtu6 != dev->mtu &&
3622 dev->mtu >= IPV6_MIN_MTU) {
3623 rt6_mtu_change(dev, dev->mtu);
3624 idev->cnf.mtu6 = dev->mtu;
3625 }
3626 idev->tstamp = jiffies;
3627 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3628
3629
3630
3631
3632
3633 if (dev->mtu < IPV6_MIN_MTU)
3634 addrconf_ifdown(dev, dev != net->loopback_dev);
3635 }
3636 break;
3637
3638 case NETDEV_DOWN:
3639 case NETDEV_UNREGISTER:
3640
3641
3642
3643 addrconf_ifdown(dev, event != NETDEV_DOWN);
3644 break;
3645
3646 case NETDEV_CHANGENAME:
3647 if (idev) {
3648 snmp6_unregister_dev(idev);
3649 addrconf_sysctl_unregister(idev);
3650 err = addrconf_sysctl_register(idev);
3651 if (err)
3652 return notifier_from_errno(err);
3653 err = snmp6_register_dev(idev);
3654 if (err) {
3655 addrconf_sysctl_unregister(idev);
3656 return notifier_from_errno(err);
3657 }
3658 }
3659 break;
3660
3661 case NETDEV_PRE_TYPE_CHANGE:
3662 case NETDEV_POST_TYPE_CHANGE:
3663 if (idev)
3664 addrconf_type_change(dev, event);
3665 break;
3666
3667 case NETDEV_CHANGEUPPER:
3668 info = ptr;
3669
3670
3671
3672
3673 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3674 addrconf_ifdown(dev, 0);
3675 }
3676
3677 return NOTIFY_OK;
3678 }
3679
3680
3681
3682
3683 static struct notifier_block ipv6_dev_notf = {
3684 .notifier_call = addrconf_notify,
3685 .priority = ADDRCONF_NOTIFY_PRIORITY,
3686 };
3687
3688 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3689 {
3690 struct inet6_dev *idev;
3691 ASSERT_RTNL();
3692
3693 idev = __in6_dev_get(dev);
3694
3695 if (event == NETDEV_POST_TYPE_CHANGE)
3696 ipv6_mc_remap(idev);
3697 else if (event == NETDEV_PRE_TYPE_CHANGE)
3698 ipv6_mc_unmap(idev);
3699 }
3700
3701 static bool addr_is_local(const struct in6_addr *addr)
3702 {
3703 return ipv6_addr_type(addr) &
3704 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3705 }
3706
3707 static int addrconf_ifdown(struct net_device *dev, int how)
3708 {
3709 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3710 struct net *net = dev_net(dev);
3711 struct inet6_dev *idev;
3712 struct inet6_ifaddr *ifa, *tmp;
3713 bool keep_addr = false;
3714 int state, i;
3715
3716 ASSERT_RTNL();
3717
3718 rt6_disable_ip(dev, event);
3719
3720 idev = __in6_dev_get(dev);
3721 if (!idev)
3722 return -ENODEV;
3723
3724
3725
3726
3727
3728 if (how) {
3729 idev->dead = 1;
3730
3731
3732 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3733
3734
3735 snmp6_unregister_dev(idev);
3736
3737 }
3738
3739
3740
3741
3742 if (!how && !idev->cnf.disable_ipv6) {
3743
3744 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3745
3746 if (!_keep_addr)
3747 _keep_addr = idev->cnf.keep_addr_on_down;
3748
3749 keep_addr = (_keep_addr > 0);
3750 }
3751
3752
3753 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3754 struct hlist_head *h = &inet6_addr_lst[i];
3755
3756 spin_lock_bh(&addrconf_hash_lock);
3757 restart:
3758 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3759 if (ifa->idev == idev) {
3760 addrconf_del_dad_work(ifa);
3761
3762
3763
3764 if (!keep_addr ||
3765 !(ifa->flags & IFA_F_PERMANENT) ||
3766 addr_is_local(&ifa->addr)) {
3767 hlist_del_init_rcu(&ifa->addr_lst);
3768 goto restart;
3769 }
3770 }
3771 }
3772 spin_unlock_bh(&addrconf_hash_lock);
3773 }
3774
3775 write_lock_bh(&idev->lock);
3776
3777 addrconf_del_rs_timer(idev);
3778
3779
3780 if (!how)
3781 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3782
3783
3784 while (!list_empty(&idev->tempaddr_list)) {
3785 ifa = list_first_entry(&idev->tempaddr_list,
3786 struct inet6_ifaddr, tmp_list);
3787 list_del(&ifa->tmp_list);
3788 write_unlock_bh(&idev->lock);
3789 spin_lock_bh(&ifa->lock);
3790
3791 if (ifa->ifpub) {
3792 in6_ifa_put(ifa->ifpub);
3793 ifa->ifpub = NULL;
3794 }
3795 spin_unlock_bh(&ifa->lock);
3796 in6_ifa_put(ifa);
3797 write_lock_bh(&idev->lock);
3798 }
3799
3800 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3801 struct fib6_info *rt = NULL;
3802 bool keep;
3803
3804 addrconf_del_dad_work(ifa);
3805
3806 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3807 !addr_is_local(&ifa->addr);
3808
3809 write_unlock_bh(&idev->lock);
3810 spin_lock_bh(&ifa->lock);
3811
3812 if (keep) {
3813
3814 state = INET6_IFADDR_STATE_DEAD;
3815 ifa->state = INET6_IFADDR_STATE_PREDAD;
3816 if (!(ifa->flags & IFA_F_NODAD))
3817 ifa->flags |= IFA_F_TENTATIVE;
3818
3819 rt = ifa->rt;
3820 ifa->rt = NULL;
3821 } else {
3822 state = ifa->state;
3823 ifa->state = INET6_IFADDR_STATE_DEAD;
3824 }
3825
3826 spin_unlock_bh(&ifa->lock);
3827
3828 if (rt)
3829 ip6_del_rt(net, rt);
3830
3831 if (state != INET6_IFADDR_STATE_DEAD) {
3832 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3833 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3834 } else {
3835 if (idev->cnf.forwarding)
3836 addrconf_leave_anycast(ifa);
3837 addrconf_leave_solict(ifa->idev, &ifa->addr);
3838 }
3839
3840 write_lock_bh(&idev->lock);
3841 if (!keep) {
3842 list_del_rcu(&ifa->if_list);
3843 in6_ifa_put(ifa);
3844 }
3845 }
3846
3847 write_unlock_bh(&idev->lock);
3848
3849
3850 if (how) {
3851 ipv6_ac_destroy_dev(idev);
3852 ipv6_mc_destroy_dev(idev);
3853 } else {
3854 ipv6_mc_down(idev);
3855 }
3856
3857 idev->tstamp = jiffies;
3858
3859
3860 if (how) {
3861 addrconf_sysctl_unregister(idev);
3862 neigh_parms_release(&nd_tbl, idev->nd_parms);
3863 neigh_ifdown(&nd_tbl, dev);
3864 in6_dev_put(idev);
3865 }
3866 return 0;
3867 }
3868
3869 static void addrconf_rs_timer(struct timer_list *t)
3870 {
3871 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3872 struct net_device *dev = idev->dev;
3873 struct in6_addr lladdr;
3874
3875 write_lock(&idev->lock);
3876 if (idev->dead || !(idev->if_flags & IF_READY))
3877 goto out;
3878
3879 if (!ipv6_accept_ra(idev))
3880 goto out;
3881
3882
3883 if (idev->if_flags & IF_RA_RCVD)
3884 goto out;
3885
3886 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3887 write_unlock(&idev->lock);
3888 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3889 ndisc_send_rs(dev, &lladdr,
3890 &in6addr_linklocal_allrouters);
3891 else
3892 goto put;
3893
3894 write_lock(&idev->lock);
3895 idev->rs_interval = rfc3315_s14_backoff_update(
3896 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3897
3898 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3899 idev->cnf.rtr_solicits) ?
3900 idev->cnf.rtr_solicit_delay :
3901 idev->rs_interval);
3902 } else {
3903
3904
3905
3906
3907 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3908 }
3909
3910 out:
3911 write_unlock(&idev->lock);
3912 put:
3913 in6_dev_put(idev);
3914 }
3915
3916
3917
3918
3919 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3920 {
3921 unsigned long rand_num;
3922 struct inet6_dev *idev = ifp->idev;
3923 u64 nonce;
3924
3925 if (ifp->flags & IFA_F_OPTIMISTIC)
3926 rand_num = 0;
3927 else
3928 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3929
3930 nonce = 0;
3931 if (idev->cnf.enhanced_dad ||
3932 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3933 do
3934 get_random_bytes(&nonce, 6);
3935 while (nonce == 0);
3936 }
3937 ifp->dad_nonce = nonce;
3938 ifp->dad_probes = idev->cnf.dad_transmits;
3939 addrconf_mod_dad_work(ifp, rand_num);
3940 }
3941
3942 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3943 {
3944 struct inet6_dev *idev = ifp->idev;
3945 struct net_device *dev = idev->dev;
3946 bool bump_id, notify = false;
3947 struct net *net;
3948
3949 addrconf_join_solict(dev, &ifp->addr);
3950
3951 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3952
3953 read_lock_bh(&idev->lock);
3954 spin_lock(&ifp->lock);
3955 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3956 goto out;
3957
3958 net = dev_net(dev);
3959 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3960 (net->ipv6.devconf_all->accept_dad < 1 &&
3961 idev->cnf.accept_dad < 1) ||
3962 !(ifp->flags&IFA_F_TENTATIVE) ||
3963 ifp->flags & IFA_F_NODAD) {
3964 bool send_na = false;
3965
3966 if (ifp->flags & IFA_F_TENTATIVE &&
3967 !(ifp->flags & IFA_F_OPTIMISTIC))
3968 send_na = true;
3969 bump_id = ifp->flags & IFA_F_TENTATIVE;
3970 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3971 spin_unlock(&ifp->lock);
3972 read_unlock_bh(&idev->lock);
3973
3974 addrconf_dad_completed(ifp, bump_id, send_na);
3975 return;
3976 }
3977
3978 if (!(idev->if_flags & IF_READY)) {
3979 spin_unlock(&ifp->lock);
3980 read_unlock_bh(&idev->lock);
3981
3982
3983
3984
3985
3986 in6_ifa_hold(ifp);
3987 addrconf_dad_stop(ifp, 0);
3988 return;
3989 }
3990
3991
3992
3993
3994
3995 if (ifp->flags & IFA_F_OPTIMISTIC) {
3996 ip6_ins_rt(net, ifp->rt);
3997 if (ipv6_use_optimistic_addr(net, idev)) {
3998
3999
4000
4001 notify = true;
4002 }
4003 }
4004
4005 addrconf_dad_kick(ifp);
4006 out:
4007 spin_unlock(&ifp->lock);
4008 read_unlock_bh(&idev->lock);
4009 if (notify)
4010 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4011 }
4012
4013 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4014 {
4015 bool begin_dad = false;
4016
4017 spin_lock_bh(&ifp->lock);
4018 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4019 ifp->state = INET6_IFADDR_STATE_PREDAD;
4020 begin_dad = true;
4021 }
4022 spin_unlock_bh(&ifp->lock);
4023
4024 if (begin_dad)
4025 addrconf_mod_dad_work(ifp, 0);
4026 }
4027
4028 static void addrconf_dad_work(struct work_struct *w)
4029 {
4030 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4031 struct inet6_ifaddr,
4032 dad_work);
4033 struct inet6_dev *idev = ifp->idev;
4034 bool bump_id, disable_ipv6 = false;
4035 struct in6_addr mcaddr;
4036
4037 enum {
4038 DAD_PROCESS,
4039 DAD_BEGIN,
4040 DAD_ABORT,
4041 } action = DAD_PROCESS;
4042
4043 rtnl_lock();
4044
4045 spin_lock_bh(&ifp->lock);
4046 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4047 action = DAD_BEGIN;
4048 ifp->state = INET6_IFADDR_STATE_DAD;
4049 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4050 action = DAD_ABORT;
4051 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4052
4053 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4054 idev->cnf.accept_dad > 1) &&
4055 !idev->cnf.disable_ipv6 &&
4056 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4057 struct in6_addr addr;
4058
4059 addr.s6_addr32[0] = htonl(0xfe800000);
4060 addr.s6_addr32[1] = 0;
4061
4062 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4063 ipv6_addr_equal(&ifp->addr, &addr)) {
4064
4065 idev->cnf.disable_ipv6 = 1;
4066
4067 pr_info("%s: IPv6 being disabled!\n",
4068 ifp->idev->dev->name);
4069 disable_ipv6 = true;
4070 }
4071 }
4072 }
4073 spin_unlock_bh(&ifp->lock);
4074
4075 if (action == DAD_BEGIN) {
4076 addrconf_dad_begin(ifp);
4077 goto out;
4078 } else if (action == DAD_ABORT) {
4079 in6_ifa_hold(ifp);
4080 addrconf_dad_stop(ifp, 1);
4081 if (disable_ipv6)
4082 addrconf_ifdown(idev->dev, 0);
4083 goto out;
4084 }
4085
4086 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4087 goto out;
4088
4089 write_lock_bh(&idev->lock);
4090 if (idev->dead || !(idev->if_flags & IF_READY)) {
4091 write_unlock_bh(&idev->lock);
4092 goto out;
4093 }
4094
4095 spin_lock(&ifp->lock);
4096 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4097 spin_unlock(&ifp->lock);
4098 write_unlock_bh(&idev->lock);
4099 goto out;
4100 }
4101
4102 if (ifp->dad_probes == 0) {
4103 bool send_na = false;
4104
4105
4106
4107
4108
4109 if (ifp->flags & IFA_F_TENTATIVE &&
4110 !(ifp->flags & IFA_F_OPTIMISTIC))
4111 send_na = true;
4112 bump_id = ifp->flags & IFA_F_TENTATIVE;
4113 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4114 spin_unlock(&ifp->lock);
4115 write_unlock_bh(&idev->lock);
4116
4117 addrconf_dad_completed(ifp, bump_id, send_na);
4118
4119 goto out;
4120 }
4121
4122 ifp->dad_probes--;
4123 addrconf_mod_dad_work(ifp,
4124 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4125 spin_unlock(&ifp->lock);
4126 write_unlock_bh(&idev->lock);
4127
4128
4129 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4130 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4131 ifp->dad_nonce);
4132 out:
4133 in6_ifa_put(ifp);
4134 rtnl_unlock();
4135 }
4136
4137
4138 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4139 {
4140 struct inet6_ifaddr *ifpiter;
4141 struct inet6_dev *idev = ifp->idev;
4142
4143 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4144 if (ifpiter->scope > IFA_LINK)
4145 break;
4146 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4147 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4148 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4149 IFA_F_PERMANENT)
4150 return false;
4151 }
4152 return true;
4153 }
4154
4155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4156 bool send_na)
4157 {
4158 struct net_device *dev = ifp->idev->dev;
4159 struct in6_addr lladdr;
4160 bool send_rs, send_mld;
4161
4162 addrconf_del_dad_work(ifp);
4163
4164
4165
4166
4167
4168 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4169
4170
4171
4172
4173
4174 read_lock_bh(&ifp->idev->lock);
4175 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4176 send_rs = send_mld &&
4177 ipv6_accept_ra(ifp->idev) &&
4178 ifp->idev->cnf.rtr_solicits != 0 &&
4179 (dev->flags&IFF_LOOPBACK) == 0;
4180 read_unlock_bh(&ifp->idev->lock);
4181
4182
4183
4184
4185 if (send_mld)
4186 ipv6_mc_dad_complete(ifp->idev);
4187
4188
4189 if (send_na &&
4190 (ifp->idev->cnf.ndisc_notify ||
4191 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4192 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4193 !!ifp->idev->cnf.forwarding,
4194 false, true,
4195 true);
4196 }
4197
4198 if (send_rs) {
4199
4200
4201
4202
4203
4204 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4205 return;
4206 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4207
4208 write_lock_bh(&ifp->idev->lock);
4209 spin_lock(&ifp->lock);
4210 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4211 ifp->idev->cnf.rtr_solicit_interval);
4212 ifp->idev->rs_probes = 1;
4213 ifp->idev->if_flags |= IF_RS_SENT;
4214 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4215 spin_unlock(&ifp->lock);
4216 write_unlock_bh(&ifp->idev->lock);
4217 }
4218
4219 if (bump_id)
4220 rt_genid_bump_ipv6(dev_net(dev));
4221
4222
4223
4224
4225 if (ifp->flags & IFA_F_TEMPORARY)
4226 addrconf_verify_rtnl();
4227 }
4228
4229 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4230 {
4231 struct inet6_ifaddr *ifp;
4232
4233 read_lock_bh(&idev->lock);
4234 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4235 spin_lock(&ifp->lock);
4236 if ((ifp->flags & IFA_F_TENTATIVE &&
4237 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4238 if (restart)
4239 ifp->state = INET6_IFADDR_STATE_PREDAD;
4240 addrconf_dad_kick(ifp);
4241 }
4242 spin_unlock(&ifp->lock);
4243 }
4244 read_unlock_bh(&idev->lock);
4245 }
4246
4247 #ifdef CONFIG_PROC_FS
4248 struct if6_iter_state {
4249 struct seq_net_private p;
4250 int bucket;
4251 int offset;
4252 };
4253
4254 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4255 {
4256 struct if6_iter_state *state = seq->private;
4257 struct net *net = seq_file_net(seq);
4258 struct inet6_ifaddr *ifa = NULL;
4259 int p = 0;
4260
4261
4262 if (pos == 0) {
4263 state->bucket = 0;
4264 state->offset = 0;
4265 }
4266
4267 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4268 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4269 addr_lst) {
4270 if (!net_eq(dev_net(ifa->idev->dev), net))
4271 continue;
4272
4273 if (p < state->offset) {
4274 p++;
4275 continue;
4276 }
4277 return ifa;
4278 }
4279
4280
4281 state->offset = 0;
4282 p = 0;
4283 }
4284 return NULL;
4285 }
4286
4287 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4288 struct inet6_ifaddr *ifa)
4289 {
4290 struct if6_iter_state *state = seq->private;
4291 struct net *net = seq_file_net(seq);
4292
4293 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4294 if (!net_eq(dev_net(ifa->idev->dev), net))
4295 continue;
4296 state->offset++;
4297 return ifa;
4298 }
4299
4300 state->offset = 0;
4301 while (++state->bucket < IN6_ADDR_HSIZE) {
4302 hlist_for_each_entry_rcu(ifa,
4303 &inet6_addr_lst[state->bucket], addr_lst) {
4304 if (!net_eq(dev_net(ifa->idev->dev), net))
4305 continue;
4306 return ifa;
4307 }
4308 }
4309
4310 return NULL;
4311 }
4312
4313 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4314 __acquires(rcu)
4315 {
4316 rcu_read_lock();
4317 return if6_get_first(seq, *pos);
4318 }
4319
4320 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4321 {
4322 struct inet6_ifaddr *ifa;
4323
4324 ifa = if6_get_next(seq, v);
4325 ++*pos;
4326 return ifa;
4327 }
4328
4329 static void if6_seq_stop(struct seq_file *seq, void *v)
4330 __releases(rcu)
4331 {
4332 rcu_read_unlock();
4333 }
4334
4335 static int if6_seq_show(struct seq_file *seq, void *v)
4336 {
4337 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4338 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4339 &ifp->addr,
4340 ifp->idev->dev->ifindex,
4341 ifp->prefix_len,
4342 ifp->scope,
4343 (u8) ifp->flags,
4344 ifp->idev->dev->name);
4345 return 0;
4346 }
4347
4348 static const struct seq_operations if6_seq_ops = {
4349 .start = if6_seq_start,
4350 .next = if6_seq_next,
4351 .show = if6_seq_show,
4352 .stop = if6_seq_stop,
4353 };
4354
4355 static int __net_init if6_proc_net_init(struct net *net)
4356 {
4357 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4358 sizeof(struct if6_iter_state)))
4359 return -ENOMEM;
4360 return 0;
4361 }
4362
4363 static void __net_exit if6_proc_net_exit(struct net *net)
4364 {
4365 remove_proc_entry("if_inet6", net->proc_net);
4366 }
4367
4368 static struct pernet_operations if6_proc_net_ops = {
4369 .init = if6_proc_net_init,
4370 .exit = if6_proc_net_exit,
4371 };
4372
4373 int __init if6_proc_init(void)
4374 {
4375 return register_pernet_subsys(&if6_proc_net_ops);
4376 }
4377
4378 void if6_proc_exit(void)
4379 {
4380 unregister_pernet_subsys(&if6_proc_net_ops);
4381 }
4382 #endif
4383
4384 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4385
4386 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4387 {
4388 unsigned int hash = inet6_addr_hash(net, addr);
4389 struct inet6_ifaddr *ifp = NULL;
4390 int ret = 0;
4391
4392 rcu_read_lock();
4393 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4394 if (!net_eq(dev_net(ifp->idev->dev), net))
4395 continue;
4396 if (ipv6_addr_equal(&ifp->addr, addr) &&
4397 (ifp->flags & IFA_F_HOMEADDRESS)) {
4398 ret = 1;
4399 break;
4400 }
4401 }
4402 rcu_read_unlock();
4403 return ret;
4404 }
4405 #endif
4406
4407
4408
4409
4410
4411 static void addrconf_verify_rtnl(void)
4412 {
4413 unsigned long now, next, next_sec, next_sched;
4414 struct inet6_ifaddr *ifp;
4415 int i;
4416
4417 ASSERT_RTNL();
4418
4419 rcu_read_lock_bh();
4420 now = jiffies;
4421 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4422
4423 cancel_delayed_work(&addr_chk_work);
4424
4425 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4426 restart:
4427 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4428 unsigned long age;
4429
4430
4431
4432
4433
4434 if ((ifp->flags & IFA_F_PERMANENT) &&
4435 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4436 continue;
4437
4438 spin_lock(&ifp->lock);
4439
4440 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4441
4442 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4443 age >= ifp->valid_lft) {
4444 spin_unlock(&ifp->lock);
4445 in6_ifa_hold(ifp);
4446 ipv6_del_addr(ifp);
4447 goto restart;
4448 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4449 spin_unlock(&ifp->lock);
4450 continue;
4451 } else if (age >= ifp->prefered_lft) {
4452
4453 int deprecate = 0;
4454
4455 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4456 deprecate = 1;
4457 ifp->flags |= IFA_F_DEPRECATED;
4458 }
4459
4460 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4461 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4462 next = ifp->tstamp + ifp->valid_lft * HZ;
4463
4464 spin_unlock(&ifp->lock);
4465
4466 if (deprecate) {
4467 in6_ifa_hold(ifp);
4468
4469 ipv6_ifa_notify(0, ifp);
4470 in6_ifa_put(ifp);
4471 goto restart;
4472 }
4473 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4474 !(ifp->flags&IFA_F_TENTATIVE)) {
4475 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4476 ifp->idev->cnf.dad_transmits *
4477 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4478
4479 if (age >= ifp->prefered_lft - regen_advance) {
4480 struct inet6_ifaddr *ifpub = ifp->ifpub;
4481 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4482 next = ifp->tstamp + ifp->prefered_lft * HZ;
4483 if (!ifp->regen_count && ifpub) {
4484 ifp->regen_count++;
4485 in6_ifa_hold(ifp);
4486 in6_ifa_hold(ifpub);
4487 spin_unlock(&ifp->lock);
4488
4489 spin_lock(&ifpub->lock);
4490 ifpub->regen_count = 0;
4491 spin_unlock(&ifpub->lock);
4492 rcu_read_unlock_bh();
4493 ipv6_create_tempaddr(ifpub, ifp, true);
4494 in6_ifa_put(ifpub);
4495 in6_ifa_put(ifp);
4496 rcu_read_lock_bh();
4497 goto restart;
4498 }
4499 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4500 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4501 spin_unlock(&ifp->lock);
4502 } else {
4503
4504 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4505 next = ifp->tstamp + ifp->prefered_lft * HZ;
4506 spin_unlock(&ifp->lock);
4507 }
4508 }
4509 }
4510
4511 next_sec = round_jiffies_up(next);
4512 next_sched = next;
4513
4514
4515 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4516 next_sched = next_sec;
4517
4518
4519 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4520 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4521
4522 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4523 now, next, next_sec, next_sched);
4524 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4525 rcu_read_unlock_bh();
4526 }
4527
4528 static void addrconf_verify_work(struct work_struct *w)
4529 {
4530 rtnl_lock();
4531 addrconf_verify_rtnl();
4532 rtnl_unlock();
4533 }
4534
4535 static void addrconf_verify(void)
4536 {
4537 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4538 }
4539
4540 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4541 struct in6_addr **peer_pfx)
4542 {
4543 struct in6_addr *pfx = NULL;
4544
4545 *peer_pfx = NULL;
4546
4547 if (addr)
4548 pfx = nla_data(addr);
4549
4550 if (local) {
4551 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4552 *peer_pfx = pfx;
4553 pfx = nla_data(local);
4554 }
4555
4556 return pfx;
4557 }
4558
4559 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4560 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4561 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4562 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4563 [IFA_FLAGS] = { .len = sizeof(u32) },
4564 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4565 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4566 };
4567
4568 static int
4569 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4570 struct netlink_ext_ack *extack)
4571 {
4572 struct net *net = sock_net(skb->sk);
4573 struct ifaddrmsg *ifm;
4574 struct nlattr *tb[IFA_MAX+1];
4575 struct in6_addr *pfx, *peer_pfx;
4576 u32 ifa_flags;
4577 int err;
4578
4579 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4580 ifa_ipv6_policy, extack);
4581 if (err < 0)
4582 return err;
4583
4584 ifm = nlmsg_data(nlh);
4585 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4586 if (!pfx)
4587 return -EINVAL;
4588
4589 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4590
4591
4592 ifa_flags &= IFA_F_MANAGETEMPADDR;
4593
4594 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4595 ifm->ifa_prefixlen);
4596 }
4597
4598 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4599 unsigned long expires, u32 flags,
4600 bool modify_peer)
4601 {
4602 struct fib6_info *f6i;
4603 u32 prio;
4604
4605 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4606 ifp->prefix_len,
4607 ifp->idev->dev, 0, RTF_DEFAULT, true);
4608 if (!f6i)
4609 return -ENOENT;
4610
4611 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4612 if (f6i->fib6_metric != prio) {
4613
4614 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4615
4616
4617 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4618 ifp->prefix_len,
4619 ifp->rt_priority, ifp->idev->dev,
4620 expires, flags, GFP_KERNEL);
4621 } else {
4622 if (!expires)
4623 fib6_clean_expires(f6i);
4624 else
4625 fib6_set_expires(f6i, expires);
4626
4627 fib6_info_release(f6i);
4628 }
4629
4630 return 0;
4631 }
4632
4633 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4634 {
4635 u32 flags;
4636 clock_t expires;
4637 unsigned long timeout;
4638 bool was_managetempaddr;
4639 bool had_prefixroute;
4640 bool new_peer = false;
4641
4642 ASSERT_RTNL();
4643
4644 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4645 return -EINVAL;
4646
4647 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4648 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4649 return -EINVAL;
4650
4651 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4652 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4653
4654 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4655 if (addrconf_finite_timeout(timeout)) {
4656 expires = jiffies_to_clock_t(timeout * HZ);
4657 cfg->valid_lft = timeout;
4658 flags = RTF_EXPIRES;
4659 } else {
4660 expires = 0;
4661 flags = 0;
4662 cfg->ifa_flags |= IFA_F_PERMANENT;
4663 }
4664
4665 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4666 if (addrconf_finite_timeout(timeout)) {
4667 if (timeout == 0)
4668 cfg->ifa_flags |= IFA_F_DEPRECATED;
4669 cfg->preferred_lft = timeout;
4670 }
4671
4672 if (cfg->peer_pfx &&
4673 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4674 if (!ipv6_addr_any(&ifp->peer_addr))
4675 cleanup_prefix_route(ifp, expires, true, true);
4676 new_peer = true;
4677 }
4678
4679 spin_lock_bh(&ifp->lock);
4680 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4681 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4682 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4683 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4684 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4685 IFA_F_NOPREFIXROUTE);
4686 ifp->flags |= cfg->ifa_flags;
4687 ifp->tstamp = jiffies;
4688 ifp->valid_lft = cfg->valid_lft;
4689 ifp->prefered_lft = cfg->preferred_lft;
4690
4691 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4692 ifp->rt_priority = cfg->rt_priority;
4693
4694 if (new_peer)
4695 ifp->peer_addr = *cfg->peer_pfx;
4696
4697 spin_unlock_bh(&ifp->lock);
4698 if (!(ifp->flags&IFA_F_TENTATIVE))
4699 ipv6_ifa_notify(0, ifp);
4700
4701 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4702 int rc = -ENOENT;
4703
4704 if (had_prefixroute)
4705 rc = modify_prefix_route(ifp, expires, flags, false);
4706
4707
4708 if (rc == -ENOENT) {
4709 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4710 ifp->rt_priority, ifp->idev->dev,
4711 expires, flags, GFP_KERNEL);
4712 }
4713
4714 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4715 rc = modify_prefix_route(ifp, expires, flags, true);
4716
4717 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4718 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4719 ifp->rt_priority, ifp->idev->dev,
4720 expires, flags, GFP_KERNEL);
4721 }
4722 } else if (had_prefixroute) {
4723 enum cleanup_prefix_rt_t action;
4724 unsigned long rt_expires;
4725
4726 write_lock_bh(&ifp->idev->lock);
4727 action = check_cleanup_prefix_route(ifp, &rt_expires);
4728 write_unlock_bh(&ifp->idev->lock);
4729
4730 if (action != CLEANUP_PREFIX_RT_NOP) {
4731 cleanup_prefix_route(ifp, rt_expires,
4732 action == CLEANUP_PREFIX_RT_DEL, false);
4733 }
4734 }
4735
4736 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4737 if (was_managetempaddr &&
4738 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4739 cfg->valid_lft = 0;
4740 cfg->preferred_lft = 0;
4741 }
4742 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4743 cfg->preferred_lft, !was_managetempaddr,
4744 jiffies);
4745 }
4746
4747 addrconf_verify_rtnl();
4748
4749 return 0;
4750 }
4751
4752 static int
4753 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4754 struct netlink_ext_ack *extack)
4755 {
4756 struct net *net = sock_net(skb->sk);
4757 struct ifaddrmsg *ifm;
4758 struct nlattr *tb[IFA_MAX+1];
4759 struct in6_addr *peer_pfx;
4760 struct inet6_ifaddr *ifa;
4761 struct net_device *dev;
4762 struct inet6_dev *idev;
4763 struct ifa6_config cfg;
4764 int err;
4765
4766 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4767 ifa_ipv6_policy, extack);
4768 if (err < 0)
4769 return err;
4770
4771 memset(&cfg, 0, sizeof(cfg));
4772
4773 ifm = nlmsg_data(nlh);
4774 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4775 if (!cfg.pfx)
4776 return -EINVAL;
4777
4778 cfg.peer_pfx = peer_pfx;
4779 cfg.plen = ifm->ifa_prefixlen;
4780 if (tb[IFA_RT_PRIORITY])
4781 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4782
4783 cfg.valid_lft = INFINITY_LIFE_TIME;
4784 cfg.preferred_lft = INFINITY_LIFE_TIME;
4785
4786 if (tb[IFA_CACHEINFO]) {
4787 struct ifa_cacheinfo *ci;
4788
4789 ci = nla_data(tb[IFA_CACHEINFO]);
4790 cfg.valid_lft = ci->ifa_valid;
4791 cfg.preferred_lft = ci->ifa_prefered;
4792 }
4793
4794 dev = __dev_get_by_index(net, ifm->ifa_index);
4795 if (!dev)
4796 return -ENODEV;
4797
4798 if (tb[IFA_FLAGS])
4799 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4800 else
4801 cfg.ifa_flags = ifm->ifa_flags;
4802
4803
4804 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4805 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4806 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4807
4808 idev = ipv6_find_idev(dev);
4809 if (IS_ERR(idev))
4810 return PTR_ERR(idev);
4811
4812 if (!ipv6_allow_optimistic_dad(net, idev))
4813 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4814
4815 if (cfg.ifa_flags & IFA_F_NODAD &&
4816 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4817 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4818 return -EINVAL;
4819 }
4820
4821 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4822 if (!ifa) {
4823
4824
4825
4826
4827 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4828 }
4829
4830 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4831 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4832 err = -EEXIST;
4833 else
4834 err = inet6_addr_modify(ifa, &cfg);
4835
4836 in6_ifa_put(ifa);
4837
4838 return err;
4839 }
4840
4841 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4842 u8 scope, int ifindex)
4843 {
4844 struct ifaddrmsg *ifm;
4845
4846 ifm = nlmsg_data(nlh);
4847 ifm->ifa_family = AF_INET6;
4848 ifm->ifa_prefixlen = prefixlen;
4849 ifm->ifa_flags = flags;
4850 ifm->ifa_scope = scope;
4851 ifm->ifa_index = ifindex;
4852 }
4853
4854 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4855 unsigned long tstamp, u32 preferred, u32 valid)
4856 {
4857 struct ifa_cacheinfo ci;
4858
4859 ci.cstamp = cstamp_delta(cstamp);
4860 ci.tstamp = cstamp_delta(tstamp);
4861 ci.ifa_prefered = preferred;
4862 ci.ifa_valid = valid;
4863
4864 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4865 }
4866
4867 static inline int rt_scope(int ifa_scope)
4868 {
4869 if (ifa_scope & IFA_HOST)
4870 return RT_SCOPE_HOST;
4871 else if (ifa_scope & IFA_LINK)
4872 return RT_SCOPE_LINK;
4873 else if (ifa_scope & IFA_SITE)
4874 return RT_SCOPE_SITE;
4875 else
4876 return RT_SCOPE_UNIVERSE;
4877 }
4878
4879 static inline int inet6_ifaddr_msgsize(void)
4880 {
4881 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4882 + nla_total_size(16)
4883 + nla_total_size(16)
4884 + nla_total_size(sizeof(struct ifa_cacheinfo))
4885 + nla_total_size(4)
4886 + nla_total_size(4) ;
4887 }
4888
4889 enum addr_type_t {
4890 UNICAST_ADDR,
4891 MULTICAST_ADDR,
4892 ANYCAST_ADDR,
4893 };
4894
4895 struct inet6_fill_args {
4896 u32 portid;
4897 u32 seq;
4898 int event;
4899 unsigned int flags;
4900 int netnsid;
4901 int ifindex;
4902 enum addr_type_t type;
4903 };
4904
4905 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4906 struct inet6_fill_args *args)
4907 {
4908 struct nlmsghdr *nlh;
4909 u32 preferred, valid;
4910
4911 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4912 sizeof(struct ifaddrmsg), args->flags);
4913 if (!nlh)
4914 return -EMSGSIZE;
4915
4916 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4917 ifa->idev->dev->ifindex);
4918
4919 if (args->netnsid >= 0 &&
4920 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4921 goto error;
4922
4923 if (!((ifa->flags&IFA_F_PERMANENT) &&
4924 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4925 preferred = ifa->prefered_lft;
4926 valid = ifa->valid_lft;
4927 if (preferred != INFINITY_LIFE_TIME) {
4928 long tval = (jiffies - ifa->tstamp)/HZ;
4929 if (preferred > tval)
4930 preferred -= tval;
4931 else
4932 preferred = 0;
4933 if (valid != INFINITY_LIFE_TIME) {
4934 if (valid > tval)
4935 valid -= tval;
4936 else
4937 valid = 0;
4938 }
4939 }
4940 } else {
4941 preferred = INFINITY_LIFE_TIME;
4942 valid = INFINITY_LIFE_TIME;
4943 }
4944
4945 if (!ipv6_addr_any(&ifa->peer_addr)) {
4946 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4947 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4948 goto error;
4949 } else
4950 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4951 goto error;
4952
4953 if (ifa->rt_priority &&
4954 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4955 goto error;
4956
4957 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4958 goto error;
4959
4960 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4961 goto error;
4962
4963 nlmsg_end(skb, nlh);
4964 return 0;
4965
4966 error:
4967 nlmsg_cancel(skb, nlh);
4968 return -EMSGSIZE;
4969 }
4970
4971 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4972 struct inet6_fill_args *args)
4973 {
4974 struct nlmsghdr *nlh;
4975 u8 scope = RT_SCOPE_UNIVERSE;
4976 int ifindex = ifmca->idev->dev->ifindex;
4977
4978 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4979 scope = RT_SCOPE_SITE;
4980
4981 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4982 sizeof(struct ifaddrmsg), args->flags);
4983 if (!nlh)
4984 return -EMSGSIZE;
4985
4986 if (args->netnsid >= 0 &&
4987 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4988 return -EMSGSIZE;
4989
4990 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4991 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4992 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4993 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4994 nlmsg_cancel(skb, nlh);
4995 return -EMSGSIZE;
4996 }
4997
4998 nlmsg_end(skb, nlh);
4999 return 0;
5000 }
5001
5002 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5003 struct inet6_fill_args *args)
5004 {
5005 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5006 int ifindex = dev ? dev->ifindex : 1;
5007 struct nlmsghdr *nlh;
5008 u8 scope = RT_SCOPE_UNIVERSE;
5009
5010 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5011 scope = RT_SCOPE_SITE;
5012
5013 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5014 sizeof(struct ifaddrmsg), args->flags);
5015 if (!nlh)
5016 return -EMSGSIZE;
5017
5018 if (args->netnsid >= 0 &&
5019 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5020 return -EMSGSIZE;
5021
5022 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5023 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5024 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5025 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5026 nlmsg_cancel(skb, nlh);
5027 return -EMSGSIZE;
5028 }
5029
5030 nlmsg_end(skb, nlh);
5031 return 0;
5032 }
5033
5034
5035 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5036 struct netlink_callback *cb, int s_ip_idx,
5037 struct inet6_fill_args *fillargs)
5038 {
5039 struct ifmcaddr6 *ifmca;
5040 struct ifacaddr6 *ifaca;
5041 int ip_idx = 0;
5042 int err = 1;
5043
5044 read_lock_bh(&idev->lock);
5045 switch (fillargs->type) {
5046 case UNICAST_ADDR: {
5047 struct inet6_ifaddr *ifa;
5048 fillargs->event = RTM_NEWADDR;
5049
5050
5051 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5052 if (ip_idx < s_ip_idx)
5053 goto next;
5054 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5055 if (err < 0)
5056 break;
5057 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5058 next:
5059 ip_idx++;
5060 }
5061 break;
5062 }
5063 case MULTICAST_ADDR:
5064 fillargs->event = RTM_GETMULTICAST;
5065
5066
5067 for (ifmca = idev->mc_list; ifmca;
5068 ifmca = ifmca->next, ip_idx++) {
5069 if (ip_idx < s_ip_idx)
5070 continue;
5071 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5072 if (err < 0)
5073 break;
5074 }
5075 break;
5076 case ANYCAST_ADDR:
5077 fillargs->event = RTM_GETANYCAST;
5078
5079 for (ifaca = idev->ac_list; ifaca;
5080 ifaca = ifaca->aca_next, ip_idx++) {
5081 if (ip_idx < s_ip_idx)
5082 continue;
5083 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5084 if (err < 0)
5085 break;
5086 }
5087 break;
5088 default:
5089 break;
5090 }
5091 read_unlock_bh(&idev->lock);
5092 cb->args[2] = ip_idx;
5093 return err;
5094 }
5095
5096 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5097 struct inet6_fill_args *fillargs,
5098 struct net **tgt_net, struct sock *sk,
5099 struct netlink_callback *cb)
5100 {
5101 struct netlink_ext_ack *extack = cb->extack;
5102 struct nlattr *tb[IFA_MAX+1];
5103 struct ifaddrmsg *ifm;
5104 int err, i;
5105
5106 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5107 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5108 return -EINVAL;
5109 }
5110
5111 ifm = nlmsg_data(nlh);
5112 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5113 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5114 return -EINVAL;
5115 }
5116
5117 fillargs->ifindex = ifm->ifa_index;
5118 if (fillargs->ifindex) {
5119 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5120 fillargs->flags |= NLM_F_DUMP_FILTERED;
5121 }
5122
5123 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5124 ifa_ipv6_policy, extack);
5125 if (err < 0)
5126 return err;
5127
5128 for (i = 0; i <= IFA_MAX; ++i) {
5129 if (!tb[i])
5130 continue;
5131
5132 if (i == IFA_TARGET_NETNSID) {
5133 struct net *net;
5134
5135 fillargs->netnsid = nla_get_s32(tb[i]);
5136 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5137 if (IS_ERR(net)) {
5138 fillargs->netnsid = -1;
5139 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5140 return PTR_ERR(net);
5141 }
5142 *tgt_net = net;
5143 } else {
5144 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5145 return -EINVAL;
5146 }
5147 }
5148
5149 return 0;
5150 }
5151
5152 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5153 enum addr_type_t type)
5154 {
5155 const struct nlmsghdr *nlh = cb->nlh;
5156 struct inet6_fill_args fillargs = {
5157 .portid = NETLINK_CB(cb->skb).portid,
5158 .seq = cb->nlh->nlmsg_seq,
5159 .flags = NLM_F_MULTI,
5160 .netnsid = -1,
5161 .type = type,
5162 };
5163 struct net *net = sock_net(skb->sk);
5164 struct net *tgt_net = net;
5165 int idx, s_idx, s_ip_idx;
5166 int h, s_h;
5167 struct net_device *dev;
5168 struct inet6_dev *idev;
5169 struct hlist_head *head;
5170 int err = 0;
5171
5172 s_h = cb->args[0];
5173 s_idx = idx = cb->args[1];
5174 s_ip_idx = cb->args[2];
5175
5176 if (cb->strict_check) {
5177 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5178 skb->sk, cb);
5179 if (err < 0)
5180 goto put_tgt_net;
5181
5182 err = 0;
5183 if (fillargs.ifindex) {
5184 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5185 if (!dev) {
5186 err = -ENODEV;
5187 goto put_tgt_net;
5188 }
5189 idev = __in6_dev_get(dev);
5190 if (idev) {
5191 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5192 &fillargs);
5193 if (err > 0)
5194 err = 0;
5195 }
5196 goto put_tgt_net;
5197 }
5198 }
5199
5200 rcu_read_lock();
5201 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5202 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5203 idx = 0;
5204 head = &tgt_net->dev_index_head[h];
5205 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5206 if (idx < s_idx)
5207 goto cont;
5208 if (h > s_h || idx > s_idx)
5209 s_ip_idx = 0;
5210 idev = __in6_dev_get(dev);
5211 if (!idev)
5212 goto cont;
5213
5214 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5215 &fillargs) < 0)
5216 goto done;
5217 cont:
5218 idx++;
5219 }
5220 }
5221 done:
5222 rcu_read_unlock();
5223 cb->args[0] = h;
5224 cb->args[1] = idx;
5225 put_tgt_net:
5226 if (fillargs.netnsid >= 0)
5227 put_net(tgt_net);
5228
5229 return skb->len ? : err;
5230 }
5231
5232 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5233 {
5234 enum addr_type_t type = UNICAST_ADDR;
5235
5236 return inet6_dump_addr(skb, cb, type);
5237 }
5238
5239 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5240 {
5241 enum addr_type_t type = MULTICAST_ADDR;
5242
5243 return inet6_dump_addr(skb, cb, type);
5244 }
5245
5246
5247 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5248 {
5249 enum addr_type_t type = ANYCAST_ADDR;
5250
5251 return inet6_dump_addr(skb, cb, type);
5252 }
5253
5254 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5255 const struct nlmsghdr *nlh,
5256 struct nlattr **tb,
5257 struct netlink_ext_ack *extack)
5258 {
5259 struct ifaddrmsg *ifm;
5260 int i, err;
5261
5262 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5263 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5264 return -EINVAL;
5265 }
5266
5267 if (!netlink_strict_get_check(skb))
5268 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5269 ifa_ipv6_policy, extack);
5270
5271 ifm = nlmsg_data(nlh);
5272 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5273 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5274 return -EINVAL;
5275 }
5276
5277 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5278 ifa_ipv6_policy, extack);
5279 if (err)
5280 return err;
5281
5282 for (i = 0; i <= IFA_MAX; i++) {
5283 if (!tb[i])
5284 continue;
5285
5286 switch (i) {
5287 case IFA_TARGET_NETNSID:
5288 case IFA_ADDRESS:
5289 case IFA_LOCAL:
5290 break;
5291 default:
5292 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5293 return -EINVAL;
5294 }
5295 }
5296
5297 return 0;
5298 }
5299
5300 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5301 struct netlink_ext_ack *extack)
5302 {
5303 struct net *net = sock_net(in_skb->sk);
5304 struct inet6_fill_args fillargs = {
5305 .portid = NETLINK_CB(in_skb).portid,
5306 .seq = nlh->nlmsg_seq,
5307 .event = RTM_NEWADDR,
5308 .flags = 0,
5309 .netnsid = -1,
5310 };
5311 struct net *tgt_net = net;
5312 struct ifaddrmsg *ifm;
5313 struct nlattr *tb[IFA_MAX+1];
5314 struct in6_addr *addr = NULL, *peer;
5315 struct net_device *dev = NULL;
5316 struct inet6_ifaddr *ifa;
5317 struct sk_buff *skb;
5318 int err;
5319
5320 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5321 if (err < 0)
5322 return err;
5323
5324 if (tb[IFA_TARGET_NETNSID]) {
5325 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5326
5327 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5328 fillargs.netnsid);
5329 if (IS_ERR(tgt_net))
5330 return PTR_ERR(tgt_net);
5331 }
5332
5333 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5334 if (!addr)
5335 return -EINVAL;
5336
5337 ifm = nlmsg_data(nlh);
5338 if (ifm->ifa_index)
5339 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5340
5341 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5342 if (!ifa) {
5343 err = -EADDRNOTAVAIL;
5344 goto errout;
5345 }
5346
5347 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5348 if (!skb) {
5349 err = -ENOBUFS;
5350 goto errout_ifa;
5351 }
5352
5353 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5354 if (err < 0) {
5355
5356 WARN_ON(err == -EMSGSIZE);
5357 kfree_skb(skb);
5358 goto errout_ifa;
5359 }
5360 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5361 errout_ifa:
5362 in6_ifa_put(ifa);
5363 errout:
5364 if (dev)
5365 dev_put(dev);
5366 if (fillargs.netnsid >= 0)
5367 put_net(tgt_net);
5368
5369 return err;
5370 }
5371
5372 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5373 {
5374 struct sk_buff *skb;
5375 struct net *net = dev_net(ifa->idev->dev);
5376 struct inet6_fill_args fillargs = {
5377 .portid = 0,
5378 .seq = 0,
5379 .event = event,
5380 .flags = 0,
5381 .netnsid = -1,
5382 };
5383 int err = -ENOBUFS;
5384
5385 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5386 if (!skb)
5387 goto errout;
5388
5389 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5390 if (err < 0) {
5391
5392 WARN_ON(err == -EMSGSIZE);
5393 kfree_skb(skb);
5394 goto errout;
5395 }
5396 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5397 return;
5398 errout:
5399 if (err < 0)
5400 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5401 }
5402
5403 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5404 __s32 *array, int bytes)
5405 {
5406 BUG_ON(bytes < (DEVCONF_MAX * 4));
5407
5408 memset(array, 0, bytes);
5409 array[DEVCONF_FORWARDING] = cnf->forwarding;
5410 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5411 array[DEVCONF_MTU6] = cnf->mtu6;
5412 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5413 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5414 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5415 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5416 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5417 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5418 jiffies_to_msecs(cnf->rtr_solicit_interval);
5419 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5420 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5421 array[DEVCONF_RTR_SOLICIT_DELAY] =
5422 jiffies_to_msecs(cnf->rtr_solicit_delay);
5423 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5424 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5425 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5426 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5427 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5428 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5429 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5430 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5431 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5432 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5433 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5434 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5435 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5436 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5437 #ifdef CONFIG_IPV6_ROUTER_PREF
5438 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5439 array[DEVCONF_RTR_PROBE_INTERVAL] =
5440 jiffies_to_msecs(cnf->rtr_probe_interval);
5441 #ifdef CONFIG_IPV6_ROUTE_INFO
5442 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5443 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5444 #endif
5445 #endif
5446 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5447 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5448 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5449 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5450 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5451 #endif
5452 #ifdef CONFIG_IPV6_MROUTE
5453 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5454 #endif
5455 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5456 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5457 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5458 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5459 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5460 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5461 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5462 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5463
5464 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5465 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5466 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5467 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5468 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5469 #ifdef CONFIG_IPV6_SEG6_HMAC
5470 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5471 #endif
5472 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5473 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5474 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5475 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5476 }
5477
5478 static inline size_t inet6_ifla6_size(void)
5479 {
5480 return nla_total_size(4)
5481 + nla_total_size(sizeof(struct ifla_cacheinfo))
5482 + nla_total_size(DEVCONF_MAX * 4)
5483 + nla_total_size(IPSTATS_MIB_MAX * 8)
5484 + nla_total_size(ICMP6_MIB_MAX * 8)
5485 + nla_total_size(sizeof(struct in6_addr))
5486 + nla_total_size(1)
5487 + 0;
5488 }
5489
5490 static inline size_t inet6_if_nlmsg_size(void)
5491 {
5492 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5493 + nla_total_size(IFNAMSIZ)
5494 + nla_total_size(MAX_ADDR_LEN)
5495 + nla_total_size(4)
5496 + nla_total_size(4)
5497 + nla_total_size(1)
5498 + nla_total_size(inet6_ifla6_size());
5499 }
5500
5501 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5502 int bytes)
5503 {
5504 int i;
5505 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5506 BUG_ON(pad < 0);
5507
5508
5509 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5510 for (i = 1; i < ICMP6_MIB_MAX; i++)
5511 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5512
5513 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5514 }
5515
5516 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5517 int bytes, size_t syncpoff)
5518 {
5519 int i, c;
5520 u64 buff[IPSTATS_MIB_MAX];
5521 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5522
5523 BUG_ON(pad < 0);
5524
5525 memset(buff, 0, sizeof(buff));
5526 buff[0] = IPSTATS_MIB_MAX;
5527
5528 for_each_possible_cpu(c) {
5529 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5530 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5531 }
5532
5533 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5534 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5535 }
5536
5537 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5538 int bytes)
5539 {
5540 switch (attrtype) {
5541 case IFLA_INET6_STATS:
5542 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5543 offsetof(struct ipstats_mib, syncp));
5544 break;
5545 case IFLA_INET6_ICMP6STATS:
5546 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5547 break;
5548 }
5549 }
5550
5551 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5552 u32 ext_filter_mask)
5553 {
5554 struct nlattr *nla;
5555 struct ifla_cacheinfo ci;
5556
5557 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5558 goto nla_put_failure;
5559 ci.max_reasm_len = IPV6_MAXPLEN;
5560 ci.tstamp = cstamp_delta(idev->tstamp);
5561 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5562 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5563 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5564 goto nla_put_failure;
5565 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5566 if (!nla)
5567 goto nla_put_failure;
5568 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5569
5570
5571
5572 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5573 return 0;
5574
5575 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5576 if (!nla)
5577 goto nla_put_failure;
5578 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5579
5580 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5581 if (!nla)
5582 goto nla_put_failure;
5583 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5584
5585 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5586 if (!nla)
5587 goto nla_put_failure;
5588
5589 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5590 goto nla_put_failure;
5591
5592 read_lock_bh(&idev->lock);
5593 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5594 read_unlock_bh(&idev->lock);
5595
5596 return 0;
5597
5598 nla_put_failure:
5599 return -EMSGSIZE;
5600 }
5601
5602 static size_t inet6_get_link_af_size(const struct net_device *dev,
5603 u32 ext_filter_mask)
5604 {
5605 if (!__in6_dev_get(dev))
5606 return 0;
5607
5608 return inet6_ifla6_size();
5609 }
5610
5611 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5612 u32 ext_filter_mask)
5613 {
5614 struct inet6_dev *idev = __in6_dev_get(dev);
5615
5616 if (!idev)
5617 return -ENODATA;
5618
5619 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5620 return -EMSGSIZE;
5621
5622 return 0;
5623 }
5624
5625 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5626 {
5627 struct inet6_ifaddr *ifp;
5628 struct net_device *dev = idev->dev;
5629 bool clear_token, update_rs = false;
5630 struct in6_addr ll_addr;
5631
5632 ASSERT_RTNL();
5633
5634 if (!token)
5635 return -EINVAL;
5636 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5637 return -EINVAL;
5638 if (!ipv6_accept_ra(idev))
5639 return -EINVAL;
5640 if (idev->cnf.rtr_solicits == 0)
5641 return -EINVAL;
5642
5643 write_lock_bh(&idev->lock);
5644
5645 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5646 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5647
5648 write_unlock_bh(&idev->lock);
5649
5650 clear_token = ipv6_addr_any(token);
5651 if (clear_token)
5652 goto update_lft;
5653
5654 if (!idev->dead && (idev->if_flags & IF_READY) &&
5655 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5656 IFA_F_OPTIMISTIC)) {
5657
5658
5659
5660 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5661 update_rs = true;
5662 }
5663
5664 update_lft:
5665 write_lock_bh(&idev->lock);
5666
5667 if (update_rs) {
5668 idev->if_flags |= IF_RS_SENT;
5669 idev->rs_interval = rfc3315_s14_backoff_init(
5670 idev->cnf.rtr_solicit_interval);
5671 idev->rs_probes = 1;
5672 addrconf_mod_rs_timer(idev, idev->rs_interval);
5673 }
5674
5675
5676 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5677 spin_lock(&ifp->lock);
5678 if (ifp->tokenized) {
5679 ifp->valid_lft = 0;
5680 ifp->prefered_lft = 0;
5681 }
5682 spin_unlock(&ifp->lock);
5683 }
5684
5685 write_unlock_bh(&idev->lock);
5686 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5687 addrconf_verify_rtnl();
5688 return 0;
5689 }
5690
5691 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5692 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5693 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5694 };
5695
5696 static int check_addr_gen_mode(int mode)
5697 {
5698 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5699 mode != IN6_ADDR_GEN_MODE_NONE &&
5700 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5701 mode != IN6_ADDR_GEN_MODE_RANDOM)
5702 return -EINVAL;
5703 return 1;
5704 }
5705
5706 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5707 int mode)
5708 {
5709 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5710 !idev->cnf.stable_secret.initialized &&
5711 !net->ipv6.devconf_dflt->stable_secret.initialized)
5712 return -EINVAL;
5713 return 1;
5714 }
5715
5716 static int inet6_validate_link_af(const struct net_device *dev,
5717 const struct nlattr *nla)
5718 {
5719 struct nlattr *tb[IFLA_INET6_MAX + 1];
5720 struct inet6_dev *idev = NULL;
5721 int err;
5722
5723 if (dev) {
5724 idev = __in6_dev_get(dev);
5725 if (!idev)
5726 return -EAFNOSUPPORT;
5727 }
5728
5729 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5730 inet6_af_policy, NULL);
5731 if (err)
5732 return err;
5733
5734 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5735 return -EINVAL;
5736
5737 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5738 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5739
5740 if (check_addr_gen_mode(mode) < 0)
5741 return -EINVAL;
5742 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5743 return -EINVAL;
5744 }
5745
5746 return 0;
5747 }
5748
5749 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5750 {
5751 struct inet6_dev *idev = __in6_dev_get(dev);
5752 struct nlattr *tb[IFLA_INET6_MAX + 1];
5753 int err;
5754
5755 if (!idev)
5756 return -EAFNOSUPPORT;
5757
5758 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5759 BUG();
5760
5761 if (tb[IFLA_INET6_TOKEN]) {
5762 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5763 if (err)
5764 return err;
5765 }
5766
5767 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5768 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5769
5770 idev->cnf.addr_gen_mode = mode;
5771 }
5772
5773 return 0;
5774 }
5775
5776 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5777 u32 portid, u32 seq, int event, unsigned int flags)
5778 {
5779 struct net_device *dev = idev->dev;
5780 struct ifinfomsg *hdr;
5781 struct nlmsghdr *nlh;
5782 void *protoinfo;
5783
5784 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5785 if (!nlh)
5786 return -EMSGSIZE;
5787
5788 hdr = nlmsg_data(nlh);
5789 hdr->ifi_family = AF_INET6;
5790 hdr->__ifi_pad = 0;
5791 hdr->ifi_type = dev->type;
5792 hdr->ifi_index = dev->ifindex;
5793 hdr->ifi_flags = dev_get_flags(dev);
5794 hdr->ifi_change = 0;
5795
5796 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5797 (dev->addr_len &&
5798 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5799 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5800 (dev->ifindex != dev_get_iflink(dev) &&
5801 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5802 nla_put_u8(skb, IFLA_OPERSTATE,
5803 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5804 goto nla_put_failure;
5805 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5806 if (!protoinfo)
5807 goto nla_put_failure;
5808
5809 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5810 goto nla_put_failure;
5811
5812 nla_nest_end(skb, protoinfo);
5813 nlmsg_end(skb, nlh);
5814 return 0;
5815
5816 nla_put_failure:
5817 nlmsg_cancel(skb, nlh);
5818 return -EMSGSIZE;
5819 }
5820
5821 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5822 struct netlink_ext_ack *extack)
5823 {
5824 struct ifinfomsg *ifm;
5825
5826 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5827 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5828 return -EINVAL;
5829 }
5830
5831 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5832 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5833 return -EINVAL;
5834 }
5835
5836 ifm = nlmsg_data(nlh);
5837 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5838 ifm->ifi_change || ifm->ifi_index) {
5839 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5840 return -EINVAL;
5841 }
5842
5843 return 0;
5844 }
5845
5846 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5847 {
5848 struct net *net = sock_net(skb->sk);
5849 int h, s_h;
5850 int idx = 0, s_idx;
5851 struct net_device *dev;
5852 struct inet6_dev *idev;
5853 struct hlist_head *head;
5854
5855
5856
5857
5858 if (cb->strict_check) {
5859 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5860
5861 if (err < 0)
5862 return err;
5863 }
5864
5865 s_h = cb->args[0];
5866 s_idx = cb->args[1];
5867
5868 rcu_read_lock();
5869 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5870 idx = 0;
5871 head = &net->dev_index_head[h];
5872 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5873 if (idx < s_idx)
5874 goto cont;
5875 idev = __in6_dev_get(dev);
5876 if (!idev)
5877 goto cont;
5878 if (inet6_fill_ifinfo(skb, idev,
5879 NETLINK_CB(cb->skb).portid,
5880 cb->nlh->nlmsg_seq,
5881 RTM_NEWLINK, NLM_F_MULTI) < 0)
5882 goto out;
5883 cont:
5884 idx++;
5885 }
5886 }
5887 out:
5888 rcu_read_unlock();
5889 cb->args[1] = idx;
5890 cb->args[0] = h;
5891
5892 return skb->len;
5893 }
5894
5895 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5896 {
5897 struct sk_buff *skb;
5898 struct net *net = dev_net(idev->dev);
5899 int err = -ENOBUFS;
5900
5901 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5902 if (!skb)
5903 goto errout;
5904
5905 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5906 if (err < 0) {
5907
5908 WARN_ON(err == -EMSGSIZE);
5909 kfree_skb(skb);
5910 goto errout;
5911 }
5912 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5913 return;
5914 errout:
5915 if (err < 0)
5916 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5917 }
5918
5919 static inline size_t inet6_prefix_nlmsg_size(void)
5920 {
5921 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5922 + nla_total_size(sizeof(struct in6_addr))
5923 + nla_total_size(sizeof(struct prefix_cacheinfo));
5924 }
5925
5926 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5927 struct prefix_info *pinfo, u32 portid, u32 seq,
5928 int event, unsigned int flags)
5929 {
5930 struct prefixmsg *pmsg;
5931 struct nlmsghdr *nlh;
5932 struct prefix_cacheinfo ci;
5933
5934 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5935 if (!nlh)
5936 return -EMSGSIZE;
5937
5938 pmsg = nlmsg_data(nlh);
5939 pmsg->prefix_family = AF_INET6;
5940 pmsg->prefix_pad1 = 0;
5941 pmsg->prefix_pad2 = 0;
5942 pmsg->prefix_ifindex = idev->dev->ifindex;
5943 pmsg->prefix_len = pinfo->prefix_len;
5944 pmsg->prefix_type = pinfo->type;
5945 pmsg->prefix_pad3 = 0;
5946 pmsg->prefix_flags = 0;
5947 if (pinfo->onlink)
5948 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5949 if (pinfo->autoconf)
5950 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5951
5952 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5953 goto nla_put_failure;
5954 ci.preferred_time = ntohl(pinfo->prefered);
5955 ci.valid_time = ntohl(pinfo->valid);
5956 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5957 goto nla_put_failure;
5958 nlmsg_end(skb, nlh);
5959 return 0;
5960
5961 nla_put_failure:
5962 nlmsg_cancel(skb, nlh);
5963 return -EMSGSIZE;
5964 }
5965
5966 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5967 struct prefix_info *pinfo)
5968 {
5969 struct sk_buff *skb;
5970 struct net *net = dev_net(idev->dev);
5971 int err = -ENOBUFS;
5972
5973 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5974 if (!skb)
5975 goto errout;
5976
5977 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5978 if (err < 0) {
5979
5980 WARN_ON(err == -EMSGSIZE);
5981 kfree_skb(skb);
5982 goto errout;
5983 }
5984 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5985 return;
5986 errout:
5987 if (err < 0)
5988 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5989 }
5990
5991 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5992 {
5993 struct net *net = dev_net(ifp->idev->dev);
5994
5995 if (event)
5996 ASSERT_RTNL();
5997
5998 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5999
6000 switch (event) {
6001 case RTM_NEWADDR:
6002
6003
6004
6005
6006
6007
6008
6009
6010 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6011 ip6_ins_rt(net, ifp->rt);
6012 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6013 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6014 &ifp->addr, ifp->idev->dev->name);
6015 }
6016
6017 if (ifp->idev->cnf.forwarding)
6018 addrconf_join_anycast(ifp);
6019 if (!ipv6_addr_any(&ifp->peer_addr))
6020 addrconf_prefix_route(&ifp->peer_addr, 128,
6021 ifp->rt_priority, ifp->idev->dev,
6022 0, 0, GFP_ATOMIC);
6023 break;
6024 case RTM_DELADDR:
6025 if (ifp->idev->cnf.forwarding)
6026 addrconf_leave_anycast(ifp);
6027 addrconf_leave_solict(ifp->idev, &ifp->addr);
6028 if (!ipv6_addr_any(&ifp->peer_addr)) {
6029 struct fib6_info *rt;
6030
6031 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6032 ifp->idev->dev, 0, 0,
6033 false);
6034 if (rt)
6035 ip6_del_rt(net, rt);
6036 }
6037 if (ifp->rt) {
6038 ip6_del_rt(net, ifp->rt);
6039 ifp->rt = NULL;
6040 }
6041 rt_genid_bump_ipv6(net);
6042 break;
6043 }
6044 atomic_inc(&net->ipv6.dev_addr_genid);
6045 }
6046
6047 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6048 {
6049 rcu_read_lock_bh();
6050 if (likely(ifp->idev->dead == 0))
6051 __ipv6_ifa_notify(event, ifp);
6052 rcu_read_unlock_bh();
6053 }
6054
6055 #ifdef CONFIG_SYSCTL
6056
6057 static
6058 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6059 void __user *buffer, size_t *lenp, loff_t *ppos)
6060 {
6061 int *valp = ctl->data;
6062 int val = *valp;
6063 loff_t pos = *ppos;
6064 struct ctl_table lctl;
6065 int ret;
6066
6067
6068
6069
6070
6071 lctl = *ctl;
6072 lctl.data = &val;
6073
6074 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6075
6076 if (write)
6077 ret = addrconf_fixup_forwarding(ctl, valp, val);
6078 if (ret)
6079 *ppos = pos;
6080 return ret;
6081 }
6082
6083 static
6084 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6085 void __user *buffer, size_t *lenp, loff_t *ppos)
6086 {
6087 struct inet6_dev *idev = ctl->extra1;
6088 int min_mtu = IPV6_MIN_MTU;
6089 struct ctl_table lctl;
6090
6091 lctl = *ctl;
6092 lctl.extra1 = &min_mtu;
6093 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6094
6095 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6096 }
6097
6098 static void dev_disable_change(struct inet6_dev *idev)
6099 {
6100 struct netdev_notifier_info info;
6101
6102 if (!idev || !idev->dev)
6103 return;
6104
6105 netdev_notifier_info_init(&info, idev->dev);
6106 if (idev->cnf.disable_ipv6)
6107 addrconf_notify(NULL, NETDEV_DOWN, &info);
6108 else
6109 addrconf_notify(NULL, NETDEV_UP, &info);
6110 }
6111
6112 static void addrconf_disable_change(struct net *net, __s32 newf)
6113 {
6114 struct net_device *dev;
6115 struct inet6_dev *idev;
6116
6117 for_each_netdev(net, dev) {
6118 idev = __in6_dev_get(dev);
6119 if (idev) {
6120 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6121 idev->cnf.disable_ipv6 = newf;
6122 if (changed)
6123 dev_disable_change(idev);
6124 }
6125 }
6126 }
6127
6128 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6129 {
6130 struct net *net;
6131 int old;
6132
6133 if (!rtnl_trylock())
6134 return restart_syscall();
6135
6136 net = (struct net *)table->extra2;
6137 old = *p;
6138 *p = newf;
6139
6140 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6141 rtnl_unlock();
6142 return 0;
6143 }
6144
6145 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6146 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6147 addrconf_disable_change(net, newf);
6148 } else if ((!newf) ^ (!old))
6149 dev_disable_change((struct inet6_dev *)table->extra1);
6150
6151 rtnl_unlock();
6152 return 0;
6153 }
6154
6155 static
6156 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6157 void __user *buffer, size_t *lenp, loff_t *ppos)
6158 {
6159 int *valp = ctl->data;
6160 int val = *valp;
6161 loff_t pos = *ppos;
6162 struct ctl_table lctl;
6163 int ret;
6164
6165
6166
6167
6168
6169 lctl = *ctl;
6170 lctl.data = &val;
6171
6172 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6173
6174 if (write)
6175 ret = addrconf_disable_ipv6(ctl, valp, val);
6176 if (ret)
6177 *ppos = pos;
6178 return ret;
6179 }
6180
6181 static
6182 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6183 void __user *buffer, size_t *lenp, loff_t *ppos)
6184 {
6185 int *valp = ctl->data;
6186 int ret;
6187 int old, new;
6188
6189 old = *valp;
6190 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6191 new = *valp;
6192
6193 if (write && old != new) {
6194 struct net *net = ctl->extra2;
6195
6196 if (!rtnl_trylock())
6197 return restart_syscall();
6198
6199 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6200 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6201 NETCONFA_PROXY_NEIGH,
6202 NETCONFA_IFINDEX_DEFAULT,
6203 net->ipv6.devconf_dflt);
6204 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6205 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6206 NETCONFA_PROXY_NEIGH,
6207 NETCONFA_IFINDEX_ALL,
6208 net->ipv6.devconf_all);
6209 else {
6210 struct inet6_dev *idev = ctl->extra1;
6211
6212 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6213 NETCONFA_PROXY_NEIGH,
6214 idev->dev->ifindex,
6215 &idev->cnf);
6216 }
6217 rtnl_unlock();
6218 }
6219
6220 return ret;
6221 }
6222
6223 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6224 void __user *buffer, size_t *lenp,
6225 loff_t *ppos)
6226 {
6227 int ret = 0;
6228 u32 new_val;
6229 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6230 struct net *net = (struct net *)ctl->extra2;
6231 struct ctl_table tmp = {
6232 .data = &new_val,
6233 .maxlen = sizeof(new_val),
6234 .mode = ctl->mode,
6235 };
6236
6237 if (!rtnl_trylock())
6238 return restart_syscall();
6239
6240 new_val = *((u32 *)ctl->data);
6241
6242 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6243 if (ret != 0)
6244 goto out;
6245
6246 if (write) {
6247 if (check_addr_gen_mode(new_val) < 0) {
6248 ret = -EINVAL;
6249 goto out;
6250 }
6251
6252 if (idev) {
6253 if (check_stable_privacy(idev, net, new_val) < 0) {
6254 ret = -EINVAL;
6255 goto out;
6256 }
6257
6258 if (idev->cnf.addr_gen_mode != new_val) {
6259 idev->cnf.addr_gen_mode = new_val;
6260 addrconf_dev_config(idev->dev);
6261 }
6262 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6263 struct net_device *dev;
6264
6265 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6266 for_each_netdev(net, dev) {
6267 idev = __in6_dev_get(dev);
6268 if (idev &&
6269 idev->cnf.addr_gen_mode != new_val) {
6270 idev->cnf.addr_gen_mode = new_val;
6271 addrconf_dev_config(idev->dev);
6272 }
6273 }
6274 }
6275
6276 *((u32 *)ctl->data) = new_val;
6277 }
6278
6279 out:
6280 rtnl_unlock();
6281
6282 return ret;
6283 }
6284
6285 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6286 void __user *buffer, size_t *lenp,
6287 loff_t *ppos)
6288 {
6289 int err;
6290 struct in6_addr addr;
6291 char str[IPV6_MAX_STRLEN];
6292 struct ctl_table lctl = *ctl;
6293 struct net *net = ctl->extra2;
6294 struct ipv6_stable_secret *secret = ctl->data;
6295
6296 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6297 return -EIO;
6298
6299 lctl.maxlen = IPV6_MAX_STRLEN;
6300 lctl.data = str;
6301
6302 if (!rtnl_trylock())
6303 return restart_syscall();
6304
6305 if (!write && !secret->initialized) {
6306 err = -EIO;
6307 goto out;
6308 }
6309
6310 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6311 if (err >= sizeof(str)) {
6312 err = -EIO;
6313 goto out;
6314 }
6315
6316 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6317 if (err || !write)
6318 goto out;
6319
6320 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6321 err = -EIO;
6322 goto out;
6323 }
6324
6325 secret->initialized = true;
6326 secret->secret = addr;
6327
6328 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6329 struct net_device *dev;
6330
6331 for_each_netdev(net, dev) {
6332 struct inet6_dev *idev = __in6_dev_get(dev);
6333
6334 if (idev) {
6335 idev->cnf.addr_gen_mode =
6336 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6337 }
6338 }
6339 } else {
6340 struct inet6_dev *idev = ctl->extra1;
6341
6342 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6343 }
6344
6345 out:
6346 rtnl_unlock();
6347
6348 return err;
6349 }
6350
6351 static
6352 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6353 int write,
6354 void __user *buffer,
6355 size_t *lenp,
6356 loff_t *ppos)
6357 {
6358 int *valp = ctl->data;
6359 int val = *valp;
6360 loff_t pos = *ppos;
6361 struct ctl_table lctl;
6362 int ret;
6363
6364
6365
6366
6367 lctl = *ctl;
6368 lctl.data = &val;
6369
6370 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6371
6372 if (write)
6373 ret = addrconf_fixup_linkdown(ctl, valp, val);
6374 if (ret)
6375 *ppos = pos;
6376 return ret;
6377 }
6378
6379 static
6380 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6381 {
6382 if (rt) {
6383 if (action)
6384 rt->dst.flags |= DST_NOPOLICY;
6385 else
6386 rt->dst.flags &= ~DST_NOPOLICY;
6387 }
6388 }
6389
6390 static
6391 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6392 {
6393 struct inet6_ifaddr *ifa;
6394
6395 read_lock_bh(&idev->lock);
6396 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6397 spin_lock(&ifa->lock);
6398 if (ifa->rt) {
6399
6400 struct fib6_nh *nh = ifa->rt->fib6_nh;
6401 int cpu;
6402
6403 rcu_read_lock();
6404 ifa->rt->dst_nopolicy = val ? true : false;
6405 if (nh->rt6i_pcpu) {
6406 for_each_possible_cpu(cpu) {
6407 struct rt6_info **rtp;
6408
6409 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6410 addrconf_set_nopolicy(*rtp, val);
6411 }
6412 }
6413 rcu_read_unlock();
6414 }
6415 spin_unlock(&ifa->lock);
6416 }
6417 read_unlock_bh(&idev->lock);
6418 }
6419
6420 static
6421 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6422 {
6423 struct inet6_dev *idev;
6424 struct net *net;
6425
6426 if (!rtnl_trylock())
6427 return restart_syscall();
6428
6429 *valp = val;
6430
6431 net = (struct net *)ctl->extra2;
6432 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6433 rtnl_unlock();
6434 return 0;
6435 }
6436
6437 if (valp == &net->ipv6.devconf_all->disable_policy) {
6438 struct net_device *dev;
6439
6440 for_each_netdev(net, dev) {
6441 idev = __in6_dev_get(dev);
6442 if (idev)
6443 addrconf_disable_policy_idev(idev, val);
6444 }
6445 } else {
6446 idev = (struct inet6_dev *)ctl->extra1;
6447 addrconf_disable_policy_idev(idev, val);
6448 }
6449
6450 rtnl_unlock();
6451 return 0;
6452 }
6453
6454 static
6455 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6456 void __user *buffer, size_t *lenp,
6457 loff_t *ppos)
6458 {
6459 int *valp = ctl->data;
6460 int val = *valp;
6461 loff_t pos = *ppos;
6462 struct ctl_table lctl;
6463 int ret;
6464
6465 lctl = *ctl;
6466 lctl.data = &val;
6467 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6468
6469 if (write && (*valp != val))
6470 ret = addrconf_disable_policy(ctl, valp, val);
6471
6472 if (ret)
6473 *ppos = pos;
6474
6475 return ret;
6476 }
6477
6478 static int minus_one = -1;
6479 static const int two_five_five = 255;
6480
6481 static const struct ctl_table addrconf_sysctl[] = {
6482 {
6483 .procname = "forwarding",
6484 .data = &ipv6_devconf.forwarding,
6485 .maxlen = sizeof(int),
6486 .mode = 0644,
6487 .proc_handler = addrconf_sysctl_forward,
6488 },
6489 {
6490 .procname = "hop_limit",
6491 .data = &ipv6_devconf.hop_limit,
6492 .maxlen = sizeof(int),
6493 .mode = 0644,
6494 .proc_handler = proc_dointvec_minmax,
6495 .extra1 = (void *)SYSCTL_ONE,
6496 .extra2 = (void *)&two_five_five,
6497 },
6498 {
6499 .procname = "mtu",
6500 .data = &ipv6_devconf.mtu6,
6501 .maxlen = sizeof(int),
6502 .mode = 0644,
6503 .proc_handler = addrconf_sysctl_mtu,
6504 },
6505 {
6506 .procname = "accept_ra",
6507 .data = &ipv6_devconf.accept_ra,
6508 .maxlen = sizeof(int),
6509 .mode = 0644,
6510 .proc_handler = proc_dointvec,
6511 },
6512 {
6513 .procname = "accept_redirects",
6514 .data = &ipv6_devconf.accept_redirects,
6515 .maxlen = sizeof(int),
6516 .mode = 0644,
6517 .proc_handler = proc_dointvec,
6518 },
6519 {
6520 .procname = "autoconf",
6521 .data = &ipv6_devconf.autoconf,
6522 .maxlen = sizeof(int),
6523 .mode = 0644,
6524 .proc_handler = proc_dointvec,
6525 },
6526 {
6527 .procname = "dad_transmits",
6528 .data = &ipv6_devconf.dad_transmits,
6529 .maxlen = sizeof(int),
6530 .mode = 0644,
6531 .proc_handler = proc_dointvec,
6532 },
6533 {
6534 .procname = "router_solicitations",
6535 .data = &ipv6_devconf.rtr_solicits,
6536 .maxlen = sizeof(int),
6537 .mode = 0644,
6538 .proc_handler = proc_dointvec_minmax,
6539 .extra1 = &minus_one,
6540 },
6541 {
6542 .procname = "router_solicitation_interval",
6543 .data = &ipv6_devconf.rtr_solicit_interval,
6544 .maxlen = sizeof(int),
6545 .mode = 0644,
6546 .proc_handler = proc_dointvec_jiffies,
6547 },
6548 {
6549 .procname = "router_solicitation_max_interval",
6550 .data = &ipv6_devconf.rtr_solicit_max_interval,
6551 .maxlen = sizeof(int),
6552 .mode = 0644,
6553 .proc_handler = proc_dointvec_jiffies,
6554 },
6555 {
6556 .procname = "router_solicitation_delay",
6557 .data = &ipv6_devconf.rtr_solicit_delay,
6558 .maxlen = sizeof(int),
6559 .mode = 0644,
6560 .proc_handler = proc_dointvec_jiffies,
6561 },
6562 {
6563 .procname = "force_mld_version",
6564 .data = &ipv6_devconf.force_mld_version,
6565 .maxlen = sizeof(int),
6566 .mode = 0644,
6567 .proc_handler = proc_dointvec,
6568 },
6569 {
6570 .procname = "mldv1_unsolicited_report_interval",
6571 .data =
6572 &ipv6_devconf.mldv1_unsolicited_report_interval,
6573 .maxlen = sizeof(int),
6574 .mode = 0644,
6575 .proc_handler = proc_dointvec_ms_jiffies,
6576 },
6577 {
6578 .procname = "mldv2_unsolicited_report_interval",
6579 .data =
6580 &ipv6_devconf.mldv2_unsolicited_report_interval,
6581 .maxlen = sizeof(int),
6582 .mode = 0644,
6583 .proc_handler = proc_dointvec_ms_jiffies,
6584 },
6585 {
6586 .procname = "use_tempaddr",
6587 .data = &ipv6_devconf.use_tempaddr,
6588 .maxlen = sizeof(int),
6589 .mode = 0644,
6590 .proc_handler = proc_dointvec,
6591 },
6592 {
6593 .procname = "temp_valid_lft",
6594 .data = &ipv6_devconf.temp_valid_lft,
6595 .maxlen = sizeof(int),
6596 .mode = 0644,
6597 .proc_handler = proc_dointvec,
6598 },
6599 {
6600 .procname = "temp_prefered_lft",
6601 .data = &ipv6_devconf.temp_prefered_lft,
6602 .maxlen = sizeof(int),
6603 .mode = 0644,
6604 .proc_handler = proc_dointvec,
6605 },
6606 {
6607 .procname = "regen_max_retry",
6608 .data = &ipv6_devconf.regen_max_retry,
6609 .maxlen = sizeof(int),
6610 .mode = 0644,
6611 .proc_handler = proc_dointvec,
6612 },
6613 {
6614 .procname = "max_desync_factor",
6615 .data = &ipv6_devconf.max_desync_factor,
6616 .maxlen = sizeof(int),
6617 .mode = 0644,
6618 .proc_handler = proc_dointvec,
6619 },
6620 {
6621 .procname = "max_addresses",
6622 .data = &ipv6_devconf.max_addresses,
6623 .maxlen = sizeof(int),
6624 .mode = 0644,
6625 .proc_handler = proc_dointvec,
6626 },
6627 {
6628 .procname = "accept_ra_defrtr",
6629 .data = &ipv6_devconf.accept_ra_defrtr,
6630 .maxlen = sizeof(int),
6631 .mode = 0644,
6632 .proc_handler = proc_dointvec,
6633 },
6634 {
6635 .procname = "accept_ra_min_hop_limit",
6636 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6637 .maxlen = sizeof(int),
6638 .mode = 0644,
6639 .proc_handler = proc_dointvec,
6640 },
6641 {
6642 .procname = "accept_ra_pinfo",
6643 .data = &ipv6_devconf.accept_ra_pinfo,
6644 .maxlen = sizeof(int),
6645 .mode = 0644,
6646 .proc_handler = proc_dointvec,
6647 },
6648 #ifdef CONFIG_IPV6_ROUTER_PREF
6649 {
6650 .procname = "accept_ra_rtr_pref",
6651 .data = &ipv6_devconf.accept_ra_rtr_pref,
6652 .maxlen = sizeof(int),
6653 .mode = 0644,
6654 .proc_handler = proc_dointvec,
6655 },
6656 {
6657 .procname = "router_probe_interval",
6658 .data = &ipv6_devconf.rtr_probe_interval,
6659 .maxlen = sizeof(int),
6660 .mode = 0644,
6661 .proc_handler = proc_dointvec_jiffies,
6662 },
6663 #ifdef CONFIG_IPV6_ROUTE_INFO
6664 {
6665 .procname = "accept_ra_rt_info_min_plen",
6666 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6667 .maxlen = sizeof(int),
6668 .mode = 0644,
6669 .proc_handler = proc_dointvec,
6670 },
6671 {
6672 .procname = "accept_ra_rt_info_max_plen",
6673 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6674 .maxlen = sizeof(int),
6675 .mode = 0644,
6676 .proc_handler = proc_dointvec,
6677 },
6678 #endif
6679 #endif
6680 {
6681 .procname = "proxy_ndp",
6682 .data = &ipv6_devconf.proxy_ndp,
6683 .maxlen = sizeof(int),
6684 .mode = 0644,
6685 .proc_handler = addrconf_sysctl_proxy_ndp,
6686 },
6687 {
6688 .procname = "accept_source_route",
6689 .data = &ipv6_devconf.accept_source_route,
6690 .maxlen = sizeof(int),
6691 .mode = 0644,
6692 .proc_handler = proc_dointvec,
6693 },
6694 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6695 {
6696 .procname = "optimistic_dad",
6697 .data = &ipv6_devconf.optimistic_dad,
6698 .maxlen = sizeof(int),
6699 .mode = 0644,
6700 .proc_handler = proc_dointvec,
6701 },
6702 {
6703 .procname = "use_optimistic",
6704 .data = &ipv6_devconf.use_optimistic,
6705 .maxlen = sizeof(int),
6706 .mode = 0644,
6707 .proc_handler = proc_dointvec,
6708 },
6709 #endif
6710 #ifdef CONFIG_IPV6_MROUTE
6711 {
6712 .procname = "mc_forwarding",
6713 .data = &ipv6_devconf.mc_forwarding,
6714 .maxlen = sizeof(int),
6715 .mode = 0444,
6716 .proc_handler = proc_dointvec,
6717 },
6718 #endif
6719 {
6720 .procname = "disable_ipv6",
6721 .data = &ipv6_devconf.disable_ipv6,
6722 .maxlen = sizeof(int),
6723 .mode = 0644,
6724 .proc_handler = addrconf_sysctl_disable,
6725 },
6726 {
6727 .procname = "accept_dad",
6728 .data = &ipv6_devconf.accept_dad,
6729 .maxlen = sizeof(int),
6730 .mode = 0644,
6731 .proc_handler = proc_dointvec,
6732 },
6733 {
6734 .procname = "force_tllao",
6735 .data = &ipv6_devconf.force_tllao,
6736 .maxlen = sizeof(int),
6737 .mode = 0644,
6738 .proc_handler = proc_dointvec
6739 },
6740 {
6741 .procname = "ndisc_notify",
6742 .data = &ipv6_devconf.ndisc_notify,
6743 .maxlen = sizeof(int),
6744 .mode = 0644,
6745 .proc_handler = proc_dointvec
6746 },
6747 {
6748 .procname = "suppress_frag_ndisc",
6749 .data = &ipv6_devconf.suppress_frag_ndisc,
6750 .maxlen = sizeof(int),
6751 .mode = 0644,
6752 .proc_handler = proc_dointvec
6753 },
6754 {
6755 .procname = "accept_ra_from_local",
6756 .data = &ipv6_devconf.accept_ra_from_local,
6757 .maxlen = sizeof(int),
6758 .mode = 0644,
6759 .proc_handler = proc_dointvec,
6760 },
6761 {
6762 .procname = "accept_ra_mtu",
6763 .data = &ipv6_devconf.accept_ra_mtu,
6764 .maxlen = sizeof(int),
6765 .mode = 0644,
6766 .proc_handler = proc_dointvec,
6767 },
6768 {
6769 .procname = "stable_secret",
6770 .data = &ipv6_devconf.stable_secret,
6771 .maxlen = IPV6_MAX_STRLEN,
6772 .mode = 0600,
6773 .proc_handler = addrconf_sysctl_stable_secret,
6774 },
6775 {
6776 .procname = "use_oif_addrs_only",
6777 .data = &ipv6_devconf.use_oif_addrs_only,
6778 .maxlen = sizeof(int),
6779 .mode = 0644,
6780 .proc_handler = proc_dointvec,
6781 },
6782 {
6783 .procname = "ignore_routes_with_linkdown",
6784 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6785 .maxlen = sizeof(int),
6786 .mode = 0644,
6787 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6788 },
6789 {
6790 .procname = "drop_unicast_in_l2_multicast",
6791 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6792 .maxlen = sizeof(int),
6793 .mode = 0644,
6794 .proc_handler = proc_dointvec,
6795 },
6796 {
6797 .procname = "drop_unsolicited_na",
6798 .data = &ipv6_devconf.drop_unsolicited_na,
6799 .maxlen = sizeof(int),
6800 .mode = 0644,
6801 .proc_handler = proc_dointvec,
6802 },
6803 {
6804 .procname = "keep_addr_on_down",
6805 .data = &ipv6_devconf.keep_addr_on_down,
6806 .maxlen = sizeof(int),
6807 .mode = 0644,
6808 .proc_handler = proc_dointvec,
6809
6810 },
6811 {
6812 .procname = "seg6_enabled",
6813 .data = &ipv6_devconf.seg6_enabled,
6814 .maxlen = sizeof(int),
6815 .mode = 0644,
6816 .proc_handler = proc_dointvec,
6817 },
6818 #ifdef CONFIG_IPV6_SEG6_HMAC
6819 {
6820 .procname = "seg6_require_hmac",
6821 .data = &ipv6_devconf.seg6_require_hmac,
6822 .maxlen = sizeof(int),
6823 .mode = 0644,
6824 .proc_handler = proc_dointvec,
6825 },
6826 #endif
6827 {
6828 .procname = "enhanced_dad",
6829 .data = &ipv6_devconf.enhanced_dad,
6830 .maxlen = sizeof(int),
6831 .mode = 0644,
6832 .proc_handler = proc_dointvec,
6833 },
6834 {
6835 .procname = "addr_gen_mode",
6836 .data = &ipv6_devconf.addr_gen_mode,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = addrconf_sysctl_addr_gen_mode,
6840 },
6841 {
6842 .procname = "disable_policy",
6843 .data = &ipv6_devconf.disable_policy,
6844 .maxlen = sizeof(int),
6845 .mode = 0644,
6846 .proc_handler = addrconf_sysctl_disable_policy,
6847 },
6848 {
6849 .procname = "ndisc_tclass",
6850 .data = &ipv6_devconf.ndisc_tclass,
6851 .maxlen = sizeof(int),
6852 .mode = 0644,
6853 .proc_handler = proc_dointvec_minmax,
6854 .extra1 = (void *)SYSCTL_ZERO,
6855 .extra2 = (void *)&two_five_five,
6856 },
6857 {
6858
6859 }
6860 };
6861
6862 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6863 struct inet6_dev *idev, struct ipv6_devconf *p)
6864 {
6865 int i, ifindex;
6866 struct ctl_table *table;
6867 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6868
6869 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6870 if (!table)
6871 goto out;
6872
6873 for (i = 0; table[i].data; i++) {
6874 table[i].data += (char *)p - (char *)&ipv6_devconf;
6875
6876
6877
6878
6879 if (!table[i].extra1 && !table[i].extra2) {
6880 table[i].extra1 = idev;
6881 table[i].extra2 = net;
6882 }
6883 }
6884
6885 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6886
6887 p->sysctl_header = register_net_sysctl(net, path, table);
6888 if (!p->sysctl_header)
6889 goto free;
6890
6891 if (!strcmp(dev_name, "all"))
6892 ifindex = NETCONFA_IFINDEX_ALL;
6893 else if (!strcmp(dev_name, "default"))
6894 ifindex = NETCONFA_IFINDEX_DEFAULT;
6895 else
6896 ifindex = idev->dev->ifindex;
6897 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6898 ifindex, p);
6899 return 0;
6900
6901 free:
6902 kfree(table);
6903 out:
6904 return -ENOBUFS;
6905 }
6906
6907 static void __addrconf_sysctl_unregister(struct net *net,
6908 struct ipv6_devconf *p, int ifindex)
6909 {
6910 struct ctl_table *table;
6911
6912 if (!p->sysctl_header)
6913 return;
6914
6915 table = p->sysctl_header->ctl_table_arg;
6916 unregister_net_sysctl_table(p->sysctl_header);
6917 p->sysctl_header = NULL;
6918 kfree(table);
6919
6920 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6921 }
6922
6923 static int addrconf_sysctl_register(struct inet6_dev *idev)
6924 {
6925 int err;
6926
6927 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6928 return -EINVAL;
6929
6930 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6931 &ndisc_ifinfo_sysctl_change);
6932 if (err)
6933 return err;
6934 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6935 idev, &idev->cnf);
6936 if (err)
6937 neigh_sysctl_unregister(idev->nd_parms);
6938
6939 return err;
6940 }
6941
6942 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6943 {
6944 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6945 idev->dev->ifindex);
6946 neigh_sysctl_unregister(idev->nd_parms);
6947 }
6948
6949
6950 #endif
6951
6952 static int __net_init addrconf_init_net(struct net *net)
6953 {
6954 int err = -ENOMEM;
6955 struct ipv6_devconf *all, *dflt;
6956
6957 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6958 if (!all)
6959 goto err_alloc_all;
6960
6961 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6962 if (!dflt)
6963 goto err_alloc_dflt;
6964
6965 if (IS_ENABLED(CONFIG_SYSCTL) &&
6966 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
6967 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6968 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6969 }
6970
6971
6972 dflt->autoconf = ipv6_defaults.autoconf;
6973 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6974
6975 dflt->stable_secret.initialized = false;
6976 all->stable_secret.initialized = false;
6977
6978 net->ipv6.devconf_all = all;
6979 net->ipv6.devconf_dflt = dflt;
6980
6981 #ifdef CONFIG_SYSCTL
6982 err = __addrconf_sysctl_register(net, "all", NULL, all);
6983 if (err < 0)
6984 goto err_reg_all;
6985
6986 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6987 if (err < 0)
6988 goto err_reg_dflt;
6989 #endif
6990 return 0;
6991
6992 #ifdef CONFIG_SYSCTL
6993 err_reg_dflt:
6994 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6995 err_reg_all:
6996 kfree(dflt);
6997 #endif
6998 err_alloc_dflt:
6999 kfree(all);
7000 err_alloc_all:
7001 return err;
7002 }
7003
7004 static void __net_exit addrconf_exit_net(struct net *net)
7005 {
7006 #ifdef CONFIG_SYSCTL
7007 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7008 NETCONFA_IFINDEX_DEFAULT);
7009 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7010 NETCONFA_IFINDEX_ALL);
7011 #endif
7012 kfree(net->ipv6.devconf_dflt);
7013 kfree(net->ipv6.devconf_all);
7014 }
7015
7016 static struct pernet_operations addrconf_ops = {
7017 .init = addrconf_init_net,
7018 .exit = addrconf_exit_net,
7019 };
7020
7021 static struct rtnl_af_ops inet6_ops __read_mostly = {
7022 .family = AF_INET6,
7023 .fill_link_af = inet6_fill_link_af,
7024 .get_link_af_size = inet6_get_link_af_size,
7025 .validate_link_af = inet6_validate_link_af,
7026 .set_link_af = inet6_set_link_af,
7027 };
7028
7029
7030
7031
7032
7033 int __init addrconf_init(void)
7034 {
7035 struct inet6_dev *idev;
7036 int i, err;
7037
7038 err = ipv6_addr_label_init();
7039 if (err < 0) {
7040 pr_crit("%s: cannot initialize default policy table: %d\n",
7041 __func__, err);
7042 goto out;
7043 }
7044
7045 err = register_pernet_subsys(&addrconf_ops);
7046 if (err < 0)
7047 goto out_addrlabel;
7048
7049 addrconf_wq = create_workqueue("ipv6_addrconf");
7050 if (!addrconf_wq) {
7051 err = -ENOMEM;
7052 goto out_nowq;
7053 }
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073 rtnl_lock();
7074 idev = ipv6_add_dev(init_net.loopback_dev);
7075 rtnl_unlock();
7076 if (IS_ERR(idev)) {
7077 err = PTR_ERR(idev);
7078 goto errlo;
7079 }
7080
7081 ip6_route_init_special_entries();
7082
7083 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7084 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7085
7086 register_netdevice_notifier(&ipv6_dev_notf);
7087
7088 addrconf_verify();
7089
7090 rtnl_af_register(&inet6_ops);
7091
7092 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7093 NULL, inet6_dump_ifinfo, 0);
7094 if (err < 0)
7095 goto errout;
7096
7097 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7098 inet6_rtm_newaddr, NULL, 0);
7099 if (err < 0)
7100 goto errout;
7101 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7102 inet6_rtm_deladdr, NULL, 0);
7103 if (err < 0)
7104 goto errout;
7105 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7106 inet6_rtm_getaddr, inet6_dump_ifaddr,
7107 RTNL_FLAG_DOIT_UNLOCKED);
7108 if (err < 0)
7109 goto errout;
7110 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7111 NULL, inet6_dump_ifmcaddr, 0);
7112 if (err < 0)
7113 goto errout;
7114 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7115 NULL, inet6_dump_ifacaddr, 0);
7116 if (err < 0)
7117 goto errout;
7118 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7119 inet6_netconf_get_devconf,
7120 inet6_netconf_dump_devconf,
7121 RTNL_FLAG_DOIT_UNLOCKED);
7122 if (err < 0)
7123 goto errout;
7124 err = ipv6_addr_label_rtnl_register();
7125 if (err < 0)
7126 goto errout;
7127
7128 return 0;
7129 errout:
7130 rtnl_unregister_all(PF_INET6);
7131 rtnl_af_unregister(&inet6_ops);
7132 unregister_netdevice_notifier(&ipv6_dev_notf);
7133 errlo:
7134 destroy_workqueue(addrconf_wq);
7135 out_nowq:
7136 unregister_pernet_subsys(&addrconf_ops);
7137 out_addrlabel:
7138 ipv6_addr_label_cleanup();
7139 out:
7140 return err;
7141 }
7142
7143 void addrconf_cleanup(void)
7144 {
7145 struct net_device *dev;
7146 int i;
7147
7148 unregister_netdevice_notifier(&ipv6_dev_notf);
7149 unregister_pernet_subsys(&addrconf_ops);
7150 ipv6_addr_label_cleanup();
7151
7152 rtnl_af_unregister(&inet6_ops);
7153
7154 rtnl_lock();
7155
7156
7157 for_each_netdev(&init_net, dev) {
7158 if (__in6_dev_get(dev) == NULL)
7159 continue;
7160 addrconf_ifdown(dev, 1);
7161 }
7162 addrconf_ifdown(init_net.loopback_dev, 2);
7163
7164
7165
7166
7167 spin_lock_bh(&addrconf_hash_lock);
7168 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7169 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7170 spin_unlock_bh(&addrconf_hash_lock);
7171 cancel_delayed_work(&addr_chk_work);
7172 rtnl_unlock();
7173
7174 destroy_workqueue(addrconf_wq);
7175 }