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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -080036 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 */
40
Joe Perchesf3213832012-05-15 14:11:53 +000041#define pr_fmt(fmt) "IPv6: " fmt
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/errno.h>
44#include <linux/types.h>
Ilpo Järvinena0bffff2009-03-21 13:36:17 -070045#include <linux/kernel.h>
Ingo Molnar174cd4b2017-02-02 19:15:33 +010046#include <linux/sched/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/socket.h>
48#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/net.h>
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +010050#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/in6.h>
52#include <linux/netdevice.h>
Thomas Graf18237302006-08-04 23:04:54 -070053#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090060#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
Randy Dunlap4fc268d2006-01-11 12:17:47 -080064#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <linux/delay.h>
66#include <linux/notifier.h>
Paulo Marques543537b2005-06-23 00:09:02 -070067#include <linux/string.h>
Eric Dumazetddbe5032012-07-18 08:11:12 +000068#include <linux/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020070#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <net/sock.h>
72#include <net/snmp.h>
73
Alexander Aring5241c2d2015-12-14 20:55:22 +010074#include <net/6lowpan.h>
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +000075#include <net/firewire.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
Thomas Graf5d620262006-08-15 00:35:02 -070083#include <net/netlink.h>
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -070084#include <net/pkt_sched.h>
David Ahernca254492015-10-12 11:47:10 -070085#include <net/l3mdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +000088#include <linux/netconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#include <linux/random.h>
Stephen Hemmingere21e8462010-03-20 16:09:01 -070090#include <linux/uaccess.h>
Herbert Xu7f7d9a62007-04-24 21:54:09 -070091#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040095#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
dingtianhongba3542e2013-08-17 10:27:04 +0800101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#else
dingtianhongba3542e2013-08-17 10:27:04 +0800103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
Thomas Graf18a31e12010-11-17 04:12:02 +0000107
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
Thomas Graf18a31e12010-11-17 04:12:02 +0000111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#ifdef CONFIG_SYSCTL
WANG Conga317a2f2014-07-25 15:25:09 -0700138static int addrconf_sysctl_register(struct inet6_dev *idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
WANG Conga317a2f2014-07-25 15:25:09 -0700141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800142{
WANG Conga317a2f2014-07-25 15:25:09 -0700143 return 0;
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#endif
150
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155static int ipv6_count_addresses(struct inet6_dev *idev);
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +0100156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160/*
161 * Configured unicast address hash table
162 */
stephen hemmingerc2e21292010-03-17 20:31:10 +0000163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
stephen hemminger5c578aed2010-03-17 20:31:11 +0000164static DEFINE_SPINLOCK(addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
Jiri Pirko93d9b7d2010-03-10 10:28:56 +0000176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178static int addrconf_ifdown(struct net_device *dev, int how);
179
Romain Kuntz21caa662013-01-09 21:06:03 +0000180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
David S. Millercf22f9a2012-04-14 21:37:40 -0400185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100186static void addrconf_dad_work(struct work_struct *w);
Paolo Abeni764d3be2016-11-22 16:57:40 +0100187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +0900188static void addrconf_dad_run(struct inet6_dev *idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 struct prefix_info *pinfo);
David S. Miller3e81c6d2010-03-20 16:18:00 -0700195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Adrian Bunk888c8482008-07-22 14:21:58 -0700198static struct ipv6_devconf ipv6_devconf __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +0200206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
Ian Morris67ba4152014-08-24 21:53:10 +0100213 .use_tempaddr = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 .max_addresses = IPV6_MAX_ADDRESSES,
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -0800219 .accept_ra_defrtr = 1,
Ben Greeard9333192014-06-25 14:44:53 -0700220 .accept_ra_from_local = 0,
Hangbin Liu8013d1d2015-07-30 14:28:42 +0800221 .accept_ra_min_hop_limit= 1,
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -0800222 .accept_ra_pinfo = 1,
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
YOSHIFUJI Hideaki52e163562006-03-20 17:05:47 -0800225 .rtr_probe_interval = 60 * HZ,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800226#ifdef CONFIG_IPV6_ROUTE_INFO
Joel Scherpelzbbea1242017-03-22 18:19:04 +0900227 .accept_ra_rt_info_min_plen = 0,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800228 .accept_ra_rt_info_max_plen = 0,
229#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800230#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -0700231 .proxy_ndp = 0,
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700232 .accept_source_route = 0, /* we do not accept RH0 by default. */
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +0900233 .disable_ipv6 = 0,
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900234 .accept_dad = 1,
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +0200235 .suppress_frag_ndisc = 1,
Harout Hedeshianc2943f12015-01-20 10:06:05 -0700236 .accept_ra_mtu = 1,
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100237 .stable_secret = {
238 .initialized = false,
Erik Kline3985e8a2015-07-22 16:38:25 +0900239 },
240 .use_oif_addrs_only = 0,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400241 .ignore_routes_with_linkdown = 0,
David Ahernf1705ec2016-02-24 09:25:37 -0800242 .keep_addr_on_down = 0,
David Lebrun1ababeb2016-11-08 14:57:39 +0100243 .seg6_enabled = 0,
David Lebrunbf355b82016-11-08 14:57:42 +0100244#ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800247 .enhanced_dad = 1,
Felix Jiad35a00b2017-01-26 16:59:17 +1300248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
David Forsterdf789fe2017-02-23 16:27:18 +0000249 .disable_policy = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250};
251
Brian Haleyab32ea52006-09-22 14:15:41 -0700252static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +0200259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 .max_addresses = IPV6_MAX_ADDRESSES,
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -0800273 .accept_ra_defrtr = 1,
Ben Greeard9333192014-06-25 14:44:53 -0700274 .accept_ra_from_local = 0,
Hangbin Liu8013d1d2015-07-30 14:28:42 +0800275 .accept_ra_min_hop_limit= 1,
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -0800276 .accept_ra_pinfo = 1,
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800277#ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
YOSHIFUJI Hideaki52e163562006-03-20 17:05:47 -0800279 .rtr_probe_interval = 60 * HZ,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800280#ifdef CONFIG_IPV6_ROUTE_INFO
Joel Scherpelzbbea1242017-03-22 18:19:04 +0900281 .accept_ra_rt_info_min_plen = 0,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800282 .accept_ra_rt_info_max_plen = 0,
283#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800284#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -0700285 .proxy_ndp = 0,
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700286 .accept_source_route = 0, /* we do not accept RH0 by default. */
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +0900287 .disable_ipv6 = 0,
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900288 .accept_dad = 1,
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +0200289 .suppress_frag_ndisc = 1,
Harout Hedeshianc2943f12015-01-20 10:06:05 -0700290 .accept_ra_mtu = 1,
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100291 .stable_secret = {
292 .initialized = false,
293 },
Erik Kline3985e8a2015-07-22 16:38:25 +0900294 .use_oif_addrs_only = 0,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400295 .ignore_routes_with_linkdown = 0,
David Ahernf1705ec2016-02-24 09:25:37 -0800296 .keep_addr_on_down = 0,
David Lebrun1ababeb2016-11-08 14:57:39 +0100297 .seg6_enabled = 0,
David Lebrunbf355b82016-11-08 14:57:42 +0100298#ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800301 .enhanced_dad = 1,
Felix Jiad35a00b2017-01-26 16:59:17 +1300302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
David Forsterdf789fe2017-02-23 16:27:18 +0000303 .disable_policy = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304};
305
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700306/* Check if a valid qdisc is available */
David S. Miller05297942008-07-08 23:01:27 -0700307static inline bool addrconf_qdisc_ok(const struct net_device *dev)
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700308{
David S. Miller05297942008-07-08 23:01:27 -0700309 return !qdisc_tx_is_noop(dev);
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700310}
311
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200312static void addrconf_del_rs_timer(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200319{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100320 if (cancel_delayed_work(&ifp->dad_work))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 __in6_ifa_put(ifp);
322}
323
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200334{
Xin Longf8a894b2017-06-15 16:33:58 +0800335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338}
339
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
John Stultz827da442013-10-07 15:51:58 -0700342 int i;
343
WANG Cong698365f2014-05-05 15:55:55 -0700344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700346 goto err_ip;
John Stultz827da442013-10-07 15:51:58 -0700347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
WANG Cong698365f2014-05-05 15:55:55 -0700350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
John Stultz827da442013-10-07 15:51:58 -0700351 u64_stats_init(&addrconf_stats->syncp);
John Stultz827da442013-10-07 15:51:58 -0700352 }
353
354
Eric Dumazetbe281e52011-05-19 01:14:23 +0000355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700358 goto err_icmp;
Eric Dumazetbe281e52011-05-19 01:14:23 +0000359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
David L Stevens14878f72007-09-16 16:52:35 -0700362 goto err_icmpmsg;
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700363
364 return 0;
365
David L Stevens14878f72007-09-16 16:52:35 -0700366err_icmpmsg:
Eric Dumazetbe281e52011-05-19 01:14:23 +0000367 kfree(idev->stats.icmpv6dev);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700368err_icmp:
WANG Cong698365f2014-05-05 15:55:55 -0700369 free_percpu(idev->stats.ipv6);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700370err_ip:
Pavel Emelyanovaaf70ec2007-10-17 21:25:32 -0700371 return -ENOMEM;
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700372}
373
Eldad Zack8e5e8f32012-04-01 07:49:08 +0000374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
376 struct inet6_dev *ndev;
WANG Conga317a2f2014-07-25 15:25:09 -0700377 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
WANG Conga317a2f2014-07-25 15:25:09 -0700382 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100385 if (!ndev)
WANG Conga317a2f2014-07-25 15:25:09 -0700386 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Ingo Oeser322f74a2006-03-20 23:01:47 -0800388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
stephen hemminger502a2ff2010-03-17 20:31:13 +0000390 INIT_LIST_HEAD(&ndev->addr_list);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
Hannes Frederic Sowa9b29c692015-12-15 22:59:12 +0100394
395 if (ndev->cnf.stable_secret.initialized)
Felix Jiad35a00b2017-01-26 16:59:17 +1300396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
Hannes Frederic Sowa9b29c692015-12-15 22:59:12 +0100397 else
Felix Jiad35a00b2017-01-26 16:59:17 +1300398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
Hannes Frederic Sowa9b29c692015-12-15 22:59:12 +0100399
Ingo Oeser322f74a2006-03-20 23:01:47 -0800400 ndev->cnf.mtu6 = dev->mtu;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
Ian Morris63159f22015-03-29 14:00:04 +0100402 if (!ndev->nd_parms) {
Ingo Oeser322f74a2006-03-20 23:01:47 -0800403 kfree(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700404 return ERR_PTR(err);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800405 }
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800408 /* We refer to the device */
409 dev_hold(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Ingo Oeser322f74a2006-03-20 23:01:47 -0800411 if (snmp6_alloc_dev(ndev) < 0) {
dingtianhongba3542e2013-08-17 10:27:04 +0800412 ADBG(KERN_WARNING
Joe Perchesf3213832012-05-15 14:11:53 +0000413 "%s: cannot allocate memory for statistics; dev=%s.\n",
dingtianhongba3542e2013-08-17 10:27:04 +0800414 __func__, dev->name);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
Roy Li8603e332011-09-20 15:10:16 -0400416 dev_put(dev);
417 kfree(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700418 return ERR_PTR(err);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800419 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Ingo Oeser322f74a2006-03-20 23:01:47 -0800421 if (snmp6_register_dev(ndev) < 0) {
dingtianhongba3542e2013-08-17 10:27:04 +0800422 ADBG(KERN_WARNING
Joe Perchesf3213832012-05-15 14:11:53 +0000423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
dingtianhongba3542e2013-08-17 10:27:04 +0800424 __func__, dev->name);
WANG Conga317a2f2014-07-25 15:25:09 -0700425 goto err_release;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200428 /* One reference from device. */
Reshetova, Elena1be92462017-07-04 09:34:55 +0300429 refcount_set(&ndev->refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
Amerigo Wang07a93622012-10-29 16:23:10 +0000434#if IS_ENABLED(CONFIG_IPV6_SIT)
YOSHIFUJI Hideakib077d7a2008-04-13 23:42:18 -0700435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
Joe Perchesf3213832012-05-15 14:11:53 +0000436 pr_info("%s: Disabled Multicast RS\n", dev->name);
YOSHIFUJI Hideakib077d7a2008-04-13 23:42:18 -0700437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
stephen hemminger372e6c82010-03-17 20:31:09 +0000441 INIT_LIST_HEAD(&ndev->tempaddr_list);
Jiri Bohac76506a92016-10-13 18:52:15 +0200442 ndev->desync_factor = U32_MAX;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
YOSHIFUJI Hideaki9625ed72008-04-13 23:47:11 -0700445 dev->type == ARPHRD_TUNNEL6 ||
Joerg Roedel0be669b2006-10-10 14:49:53 -0700446 dev->type == ARPHRD_SIT ||
Joerg Roedel0be669b2006-10-10 14:49:53 -0700447 dev->type == ARPHRD_NONE) {
Ingo Oeser322f74a2006-03-20 23:01:47 -0800448 ndev->cnf.use_tempaddr = -1;
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200449 } else
450 ipv6_regen_rndid(ndev);
David S. Miller5d9efa72013-10-28 20:07:50 -0400451
Daniel Borkmann914faa12013-04-09 03:47:14 +0000452 ndev->token = in6addr_any;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800453
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
Herbert Xu53aadcc2007-03-27 14:31:52 -0700455 ndev->if_flags |= IF_READY;
456
Ingo Oeser322f74a2006-03-20 23:01:47 -0800457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
WANG Conga317a2f2014-07-25 15:25:09 -0700459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
Sabrina Dubroca2a189f92015-11-04 14:47:53 +0100462 snmp6_unregister_dev(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700463 goto err_release;
464 }
David L Stevens30c4cf52007-01-04 12:31:14 -0800465 /* protected by rtnl_lock */
Eric Dumazetcf778b02012-01-12 04:41:32 +0000466 rcu_assign_pointer(dev->ip6_ptr, ndev);
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800467
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800471 /* Join all-node multicast group */
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800473
Li Weid6ddef92012-03-05 14:45:17 +0000474 /* Join all-router multicast group if forwarding is set */
Li Wei8b2aaed2012-03-07 14:58:07 +0000475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
Li Weid6ddef92012-03-05 14:45:17 +0000476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 return ndev;
WANG Conga317a2f2014-07-25 15:25:09 -0700479
480err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485}
486
Eldad Zack8e5e8f32012-04-01 07:49:08 +0000487static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
Stephen Hemmingere21e8462010-03-20 16:09:01 -0700493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -0700496 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return NULL;
498 }
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +0900499
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503}
504
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000505static int inet6_netconf_msgsize_devconf(int type)
506{
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
Zhang Shengju136ba622016-03-10 08:55:50 +0000509 bool all = false;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000510
Zhang Shengju136ba622016-03-10 08:55:50 +0000511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000515 size += nla_total_size(4);
David S. Millerb1afce92012-12-04 14:46:34 -0500516#ifdef CONFIG_IPV6_MROUTE
Zhang Shengju136ba622016-03-10 08:55:50 +0000517 if (all || type == NETCONFA_MC_FORWARDING)
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000518 size += nla_total_size(4);
David S. Millerb1afce92012-12-04 14:46:34 -0500519#endif
Zhang Shengju136ba622016-03-10 08:55:50 +0000520 if (all || type == NETCONFA_PROXY_NEIGH)
stephen hemmingerc92d5492013-12-17 22:37:14 -0800521 size += nla_total_size(4);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000522
Zhang Shengju136ba622016-03-10 08:55:50 +0000523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
Andy Gospodarek35103d12015-08-13 10:39:01 -0400524 size += nla_total_size(4);
525
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000526 return size;
527}
528
529static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533{
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
Zhang Shengju136ba622016-03-10 08:55:50 +0000536 bool all = false;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
Ian Morris63159f22015-03-29 14:00:04 +0100540 if (!nlh)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000541 return -EMSGSIZE;
542
Zhang Shengju136ba622016-03-10 08:55:50 +0000543 if (type == NETCONFA_ALL)
544 all = true;
545
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
David Ahern23452172017-03-28 14:28:05 -0700552 if (!devconf)
553 goto out;
554
Zhang Shengju136ba622016-03-10 08:55:50 +0000555 if ((all || type == NETCONFA_FORWARDING) &&
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
David S. Millerb1afce92012-12-04 14:46:34 -0500558#ifdef CONFIG_IPV6_MROUTE
Zhang Shengju136ba622016-03-10 08:55:50 +0000559 if ((all || type == NETCONFA_MC_FORWARDING) &&
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
David S. Millerb1afce92012-12-04 14:46:34 -0500563#endif
Zhang Shengju136ba622016-03-10 08:55:50 +0000564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
stephen hemmingerc92d5492013-12-17 22:37:14 -0800565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
Zhang Shengju136ba622016-03-10 08:55:50 +0000568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
Andy Gospodarek35103d12015-08-13 10:39:01 -0400569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
David Ahern23452172017-03-28 14:28:05 -0700573out:
Johannes Berg053c0952015-01-16 22:09:00 +0100574 nlmsg_end(skb, nlh);
575 return 0;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
David Ahern85b3daa2017-03-28 14:28:04 -0700582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
Eric Dumazet927265b2016-07-08 05:46:04 +0200588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100589 if (!skb)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
David Ahern85b3daa2017-03-28 14:28:04 -0700593 event, 0, type);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
Eric Dumazet927265b2016-07-08 05:46:04 +0200600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000601 return;
602errout:
Cong Dingbd779022012-12-18 12:08:56 +0000603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000604}
605
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
stephen hemmingerc92d5492013-12-17 22:37:14 -0800609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
Andy Gospodarek35103d12015-08-13 10:39:01 -0400610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000611};
612
613static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
David Ahernc21ef3e2017-04-16 09:48:24 -0700614 struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000616{
617 struct net *net = sock_net(in_skb->sk);
618 struct nlattr *tb[NETCONFA_MAX+1];
619 struct netconfmsg *ncm;
620 struct sk_buff *skb;
621 struct ipv6_devconf *devconf;
622 struct inet6_dev *in6_dev;
623 struct net_device *dev;
624 int ifindex;
625 int err;
626
627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
David Ahernc21ef3e2017-04-16 09:48:24 -0700628 devconf_ipv6_policy, extack);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000629 if (err < 0)
630 goto errout;
631
Anton Protopopova97eb332016-02-16 21:43:16 -0500632 err = -EINVAL;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000633 if (!tb[NETCONFA_IFINDEX])
634 goto errout;
635
636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
637 switch (ifindex) {
638 case NETCONFA_IFINDEX_ALL:
639 devconf = net->ipv6.devconf_all;
640 break;
641 case NETCONFA_IFINDEX_DEFAULT:
642 devconf = net->ipv6.devconf_dflt;
643 break;
644 default:
645 dev = __dev_get_by_index(net, ifindex);
Ian Morris63159f22015-03-29 14:00:04 +0100646 if (!dev)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000647 goto errout;
648 in6_dev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +0100649 if (!in6_dev)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000650 goto errout;
651 devconf = &in6_dev->cnf;
652 break;
653 }
654
655 err = -ENOBUFS;
Zhang Shengju136ba622016-03-10 08:55:50 +0000656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +0100657 if (!skb)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000658 goto errout;
659
660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
661 NETLINK_CB(in_skb).portid,
662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
Zhang Shengju136ba622016-03-10 08:55:50 +0000663 NETCONFA_ALL);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000664 if (err < 0) {
665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
666 WARN_ON(err == -EMSGSIZE);
667 kfree_skb(skb);
668 goto errout;
669 }
670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
671errout:
672 return err;
673}
674
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000675static int inet6_netconf_dump_devconf(struct sk_buff *skb,
676 struct netlink_callback *cb)
677{
678 struct net *net = sock_net(skb->sk);
679 int h, s_h;
680 int idx, s_idx;
681 struct net_device *dev;
682 struct inet6_dev *idev;
683 struct hlist_head *head;
684
685 s_h = cb->args[0];
686 s_idx = idx = cb->args[1];
687
688 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
689 idx = 0;
690 head = &net->dev_index_head[h];
691 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000692 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
693 net->dev_base_seq;
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000694 hlist_for_each_entry_rcu(dev, head, index_hlist) {
695 if (idx < s_idx)
696 goto cont;
697 idev = __in6_dev_get(dev);
698 if (!idev)
699 goto cont;
700
701 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
702 &idev->cnf,
703 NETLINK_CB(cb->skb).portid,
704 cb->nlh->nlmsg_seq,
705 RTM_NEWNETCONF,
706 NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000707 NETCONFA_ALL) < 0) {
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000708 rcu_read_unlock();
709 goto done;
710 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000711 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000712cont:
713 idx++;
714 }
715 rcu_read_unlock();
716 }
717 if (h == NETDEV_HASHENTRIES) {
718 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
719 net->ipv6.devconf_all,
720 NETLINK_CB(cb->skb).portid,
721 cb->nlh->nlmsg_seq,
722 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000723 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000724 goto done;
725 else
726 h++;
727 }
728 if (h == NETDEV_HASHENTRIES + 1) {
729 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
730 net->ipv6.devconf_dflt,
731 NETLINK_CB(cb->skb).portid,
732 cb->nlh->nlmsg_seq,
733 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000734 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000735 goto done;
736 else
737 h++;
738 }
739done:
740 cb->args[0] = h;
741 cb->args[1] = idx;
742
743 return skb->len;
744}
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746#ifdef CONFIG_SYSCTL
747static void dev_forward_change(struct inet6_dev *idev)
748{
749 struct net_device *dev;
750 struct inet6_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
752 if (!idev)
753 return;
754 dev = idev->dev;
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700755 if (idev->cnf.forwarding)
756 dev_disable_lro(dev);
Amerigo Wang1a940832012-10-28 17:43:53 +0000757 if (dev->flags & IFF_MULTICAST) {
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000758 if (idev->cnf.forwarding) {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900759 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000760 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
761 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
762 } else {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900763 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000764 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
765 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
766 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
stephen hemminger502a2ff2010-03-17 20:31:13 +0000768
769 list_for_each_entry(ifa, &idev->addr_list, if_list) {
Michal Wrobel2c12a742007-02-26 15:36:10 -0800770 if (ifa->flags&IFA_F_TENTATIVE)
771 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 if (idev->cnf.forwarding)
773 addrconf_join_anycast(ifa);
774 else
775 addrconf_leave_anycast(ifa);
776 }
David Ahern85b3daa2017-03-28 14:28:04 -0700777 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
778 NETCONFA_FORWARDING,
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000779 dev->ifindex, &idev->cnf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
782
Pavel Emelyanove1869322008-01-10 17:43:50 -0800783static void addrconf_forward_change(struct net *net, __s32 newf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784{
785 struct net_device *dev;
786 struct inet6_dev *idev;
787
Ben Hutchings4acd4942012-08-14 08:54:51 +0000788 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 idev = __in6_dev_get(dev);
790 if (idev) {
Pavel Emelyanove1869322008-01-10 17:43:50 -0800791 int changed = (!idev->cnf.forwarding) ^ (!newf);
792 idev->cnf.forwarding = newf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (changed)
794 dev_forward_change(idev);
795 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797}
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800798
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000799static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800800{
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800801 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000802 int old;
803
804 if (!rtnl_trylock())
805 return restart_syscall();
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800806
807 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000808 old = *p;
809 *p = newf;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800810
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000811 if (p == &net->ipv6.devconf_dflt->forwarding) {
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000812 if ((!newf) ^ (!old))
David Ahern85b3daa2017-03-28 14:28:04 -0700813 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
814 NETCONFA_FORWARDING,
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000815 NETCONFA_IFINDEX_DEFAULT,
816 net->ipv6.devconf_dflt);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000817 rtnl_unlock();
818 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +0000819 }
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000820
Pavel Emelyanove1869322008-01-10 17:43:50 -0800821 if (p == &net->ipv6.devconf_all->forwarding) {
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200822 int old_dflt = net->ipv6.devconf_dflt->forwarding;
823
Pavel Emelyanove1869322008-01-10 17:43:50 -0800824 net->ipv6.devconf_dflt->forwarding = newf;
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200825 if ((!newf) ^ (!old_dflt))
David Ahern85b3daa2017-03-28 14:28:04 -0700826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827 NETCONFA_FORWARDING,
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200828 NETCONFA_IFINDEX_DEFAULT,
829 net->ipv6.devconf_dflt);
830
Pavel Emelyanove1869322008-01-10 17:43:50 -0800831 addrconf_forward_change(net, newf);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000832 if ((!newf) ^ (!old))
David Ahern85b3daa2017-03-28 14:28:04 -0700833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834 NETCONFA_FORWARDING,
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000835 NETCONFA_IFINDEX_ALL,
836 net->ipv6.devconf_all);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000837 } else if ((!newf) ^ (!old))
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800838 dev_forward_change((struct inet6_dev *)table->extra1);
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700839 rtnl_unlock();
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800840
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000841 if (newf)
Daniel Lezcano7b4da532008-03-04 13:47:14 -0800842 rt6_purge_dflt_routers(net);
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000843 return 1;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800844}
Andy Gospodarek35103d12015-08-13 10:39:01 -0400845
846static void addrconf_linkdown_change(struct net *net, __s32 newf)
847{
848 struct net_device *dev;
849 struct inet6_dev *idev;
850
851 for_each_netdev(net, dev) {
852 idev = __in6_dev_get(dev);
853 if (idev) {
854 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
855
856 idev->cnf.ignore_routes_with_linkdown = newf;
857 if (changed)
858 inet6_netconf_notify_devconf(dev_net(dev),
David Ahern85b3daa2017-03-28 14:28:04 -0700859 RTM_NEWNETCONF,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400860 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
861 dev->ifindex,
862 &idev->cnf);
863 }
864 }
865}
866
867static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
868{
869 struct net *net;
870 int old;
871
872 if (!rtnl_trylock())
873 return restart_syscall();
874
875 net = (struct net *)table->extra2;
876 old = *p;
877 *p = newf;
878
879 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
880 if ((!newf) ^ (!old))
881 inet6_netconf_notify_devconf(net,
David Ahern85b3daa2017-03-28 14:28:04 -0700882 RTM_NEWNETCONF,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400883 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
884 NETCONFA_IFINDEX_DEFAULT,
885 net->ipv6.devconf_dflt);
886 rtnl_unlock();
887 return 0;
888 }
889
890 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
891 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
892 addrconf_linkdown_change(net, newf);
893 if ((!newf) ^ (!old))
894 inet6_netconf_notify_devconf(net,
David Ahern85b3daa2017-03-28 14:28:04 -0700895 RTM_NEWNETCONF,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400896 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
897 NETCONFA_IFINDEX_ALL,
898 net->ipv6.devconf_all);
899 }
900 rtnl_unlock();
901
902 return 1;
903}
904
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905#endif
906
stephen hemminger5c578aed2010-03-17 20:31:11 +0000907/* Nobody refers to this ifaddr, destroy it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
909{
stephen hemmingerc2e21292010-03-17 20:31:10 +0000910 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912#ifdef NET_REFCNT_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +0000913 pr_debug("%s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914#endif
915
916 in6_dev_put(ifp->idev);
917
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100918 if (cancel_delayed_work(&ifp->dad_work))
919 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
920 ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Herbert Xue9d3e082010-05-18 15:36:06 -0700922 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
Joe Perchesf3213832012-05-15 14:11:53 +0000923 pr_warn("Freeing alive inet6 address %p\n", ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 return;
925 }
Amerigo Wang94e187c2012-10-29 00:13:19 +0000926 ip6_rt_put(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
Lai Jiangshane5785982011-03-15 18:00:14 +0800928 kfree_rcu(ifp, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929}
930
Brian Haleye55ffac2006-07-10 15:25:51 -0700931static void
932ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
933{
stephen hemminger502a2ff2010-03-17 20:31:13 +0000934 struct list_head *p;
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700935 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
Brian Haleye55ffac2006-07-10 15:25:51 -0700936
937 /*
938 * Each device address list is sorted in order of scope -
939 * global before linklocal.
940 */
stephen hemminger502a2ff2010-03-17 20:31:13 +0000941 list_for_each(p, &idev->addr_list) {
942 struct inet6_ifaddr *ifa
943 = list_entry(p, struct inet6_ifaddr, if_list);
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700944 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
Brian Haleye55ffac2006-07-10 15:25:51 -0700945 break;
946 }
947
David S. Millerb54c9b92010-03-25 21:25:30 -0700948 list_add_tail(&ifp->if_list, p);
Brian Haleye55ffac2006-07-10 15:25:51 -0700949}
950
Eric Dumazetddbe5032012-07-18 08:11:12 +0000951static u32 inet6_addr_hash(const struct in6_addr *addr)
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900952{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900954}
955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956/* On success it returns ifp with increased reference count */
957
958static struct inet6_ifaddr *
Jiri Pirko3f8f5292013-08-01 10:41:27 +0200959ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
960 const struct in6_addr *peer_addr, int pfxlen,
Jiri Benc8a226b22013-08-01 10:41:28 +0200961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962{
David Forsterdf789fe2017-02-23 16:27:18 +0000963 struct net *net = dev_net(idev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 struct inet6_ifaddr *ifa = NULL;
965 struct rt6_info *rt;
Krister Johansen3ad7d242017-06-08 13:12:14 -0700966 struct in6_validator_info i6vi;
stephen hemminger3a88a812010-03-17 20:31:12 +0000967 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 int err = 0;
YOSHIFUJI Hideakid68b8272008-06-25 16:26:47 +0900969 int addr_type = ipv6_addr_type(addr);
970
971 if (addr_type == IPV6_ADDR_ANY ||
972 addr_type & IPV6_ADDR_MULTICAST ||
973 (!(idev->dev->flags & IFF_LOOPBACK) &&
974 addr_type & IPV6_ADDR_LOOPBACK))
975 return ERR_PTR(-EADDRNOTAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700977 rcu_read_lock_bh();
Krister Johansen3ad7d242017-06-08 13:12:14 -0700978
979 in6_dev_hold(idev);
980
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 if (idev->dead) {
982 err = -ENODEV; /*XXX*/
983 goto out2;
984 }
985
Brian Haley56d417b2009-06-01 03:07:33 -0700986 if (idev->cnf.disable_ipv6) {
Brian Haley9bdd8d42009-03-18 18:22:48 -0700987 err = -EACCES;
988 goto out2;
989 }
990
Krister Johansen3ad7d242017-06-08 13:12:14 -0700991 i6vi.i6vi_addr = *addr;
992 i6vi.i6vi_dev = idev;
993 rcu_read_unlock_bh();
994
995 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
996
997 rcu_read_lock_bh();
998 err = notifier_to_errno(err);
999 if (err)
1000 goto out2;
1001
stephen hemminger5c578aed2010-03-17 20:31:11 +00001002 spin_lock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003
1004 /* Ignore adding duplicate addresses on an interface */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001005 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
dingtianhongba3542e2013-08-17 10:27:04 +08001006 ADBG("ipv6_add_addr: already assigned\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 err = -EEXIST;
1008 goto out;
1009 }
1010
Ingo Oeser322f74a2006-03-20 23:01:47 -08001011 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Ian Morris63159f22015-03-29 14:00:04 +01001013 if (!ifa) {
dingtianhongba3542e2013-08-17 10:27:04 +08001014 ADBG("ipv6_add_addr: malloc failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 err = -ENOBUFS;
1016 goto out;
1017 }
1018
David S. Miller8f031512011-12-06 16:48:14 -05001019 rt = addrconf_dst_alloc(idev, addr, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 if (IS_ERR(rt)) {
1021 err = PTR_ERR(rt);
1022 goto out;
1023 }
1024
David Forsterdf789fe2017-02-23 16:27:18 +00001025 if (net->ipv6.devconf_all->disable_policy ||
1026 idev->cnf.disable_policy)
1027 rt->dst.flags |= DST_NOPOLICY;
1028
Jiri Pirkobba24892013-12-07 19:26:57 +01001029 neigh_parms_data_state_setall(idev->nd_parms);
1030
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001031 ifa->addr = *addr;
Jiri Pirko3f8f5292013-08-01 10:41:27 +02001032 if (peer_addr)
1033 ifa->peer_addr = *peer_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035 spin_lock_init(&ifa->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001036 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
stephen hemmingerc2e21292010-03-17 20:31:10 +00001037 INIT_HLIST_NODE(&ifa->addr_lst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 ifa->scope = scope;
1039 ifa->prefix_len = pfxlen;
Mahesh Bandewar66eb9f82017-05-12 17:03:39 -07001040 ifa->flags = flags;
1041 /* No need to add the TENTATIVE flag for addresses with NODAD */
1042 if (!(flags & IFA_F_NODAD))
1043 ifa->flags |= IFA_F_TENTATIVE;
Jiri Benc8a226b22013-08-01 10:41:28 +02001044 ifa->valid_lft = valid_lft;
1045 ifa->prefered_lft = prefered_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 ifa->cstamp = ifa->tstamp = jiffies;
Daniel Borkmann617fe292013-04-09 03:47:16 +00001047 ifa->tokenized = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
Keir Fraser57f5f542006-08-29 02:43:49 -07001049 ifa->rt = rt;
1050
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 ifa->idev = idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 /* For caller */
Reshetova, Elena271201c2017-07-04 09:34:56 +03001053 refcount_set(&ifa->refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
1055 /* Add to big hash table */
Eric Dumazetddbe5032012-07-18 08:11:12 +00001056 hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057
stephen hemminger5c578aed2010-03-17 20:31:11 +00001058 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001059 spin_unlock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060
1061 write_lock(&idev->lock);
1062 /* Add to inet6_dev unicast addr list. */
Brian Haleye55ffac2006-07-10 15:25:51 -07001063 ipv6_link_dev_addr(idev, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 if (ifa->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001066 list_add(&ifa->tmp_list, &idev->tempaddr_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 in6_ifa_hold(ifa);
1068 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 in6_ifa_hold(ifa);
1071 write_unlock(&idev->lock);
1072out2:
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001073 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
YOSHIFUJI Hideakifd928332005-04-19 22:27:09 -07001075 if (likely(err == 0))
Cong Wangf88c91d2013-04-14 23:18:43 +08001076 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 else {
1078 kfree(ifa);
Krister Johansen3ad7d242017-06-08 13:12:14 -07001079 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 ifa = ERR_PTR(err);
1081 }
1082
1083 return ifa;
1084out:
stephen hemminger5c578aed2010-03-17 20:31:11 +00001085 spin_unlock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 goto out2;
1087}
1088
Thomas Haller5b84efe2014-01-15 15:36:59 +01001089enum cleanup_prefix_rt_t {
1090 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1091 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1092 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1093};
1094
1095/*
1096 * Check, whether the prefix for ifp would still need a prefix route
1097 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1098 * constants.
1099 *
1100 * 1) we don't purge prefix if address was not permanent.
1101 * prefix is managed by its own lifetime.
1102 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1103 * 3) if there are no addresses, delete prefix.
1104 * 4) if there are still other permanent address(es),
1105 * corresponding prefix is still permanent.
1106 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1107 * don't purge the prefix, assume user space is managing it.
1108 * 6) otherwise, update prefix lifetime to the
1109 * longest valid lifetime among the corresponding
1110 * addresses on the device.
1111 * Note: subsequent RA will update lifetime.
1112 **/
1113static enum cleanup_prefix_rt_t
1114check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1115{
1116 struct inet6_ifaddr *ifa;
1117 struct inet6_dev *idev = ifp->idev;
1118 unsigned long lifetime;
1119 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1120
1121 *expires = jiffies;
1122
1123 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1124 if (ifa == ifp)
1125 continue;
1126 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1127 ifp->prefix_len))
1128 continue;
1129 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1130 return CLEANUP_PREFIX_RT_NOP;
1131
1132 action = CLEANUP_PREFIX_RT_EXPIRE;
1133
1134 spin_lock(&ifa->lock);
1135
1136 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1137 /*
1138 * Note: Because this address is
1139 * not permanent, lifetime <
1140 * LONG_MAX / HZ here.
1141 */
1142 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1143 *expires = ifa->tstamp + lifetime * HZ;
1144 spin_unlock(&ifa->lock);
1145 }
1146
1147 return action;
1148}
1149
1150static void
1151cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1152{
1153 struct rt6_info *rt;
1154
1155 rt = addrconf_get_prefix_route(&ifp->addr,
1156 ifp->prefix_len,
1157 ifp->idev->dev,
1158 0, RTF_GATEWAY | RTF_DEFAULT);
1159 if (rt) {
1160 if (del_rt)
1161 ip6_del_rt(rt);
1162 else {
1163 if (!(rt->rt6i_flags & RTF_EXPIRES))
1164 rt6_set_expires(rt, expires);
1165 ip6_rt_put(rt);
1166 }
1167 }
1168}
1169
1170
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171/* This function wants to get referenced ifp and releases it before return */
1172
1173static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1174{
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001175 int state;
Thomas Haller5b84efe2014-01-15 15:36:59 +01001176 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1177 unsigned long expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001179 ASSERT_RTNL();
1180
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001181 spin_lock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001182 state = ifp->state;
Herbert Xue9d3e082010-05-18 15:36:06 -07001183 ifp->state = INET6_IFADDR_STATE_DEAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001184 spin_unlock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001185
1186 if (state == INET6_IFADDR_STATE_DEAD)
1187 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
stephen hemminger5c578aed2010-03-17 20:31:11 +00001189 spin_lock_bh(&addrconf_hash_lock);
1190 hlist_del_init_rcu(&ifp->addr_lst);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001191 spin_unlock_bh(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
Thomas Haller5b84efe2014-01-15 15:36:59 +01001193 write_lock_bh(&ifp->idev->lock);
David S. Miller5d9efa72013-10-28 20:07:50 -04001194
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 if (ifp->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001196 list_del(&ifp->tmp_list);
1197 if (ifp->ifpub) {
1198 in6_ifa_put(ifp->ifpub);
1199 ifp->ifpub = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 }
stephen hemminger372e6c82010-03-17 20:31:09 +00001201 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
Thomas Haller5b84efe2014-01-15 15:36:59 +01001204 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1205 action = check_cleanup_prefix_route(ifp, &expires);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001206
Thomas Haller5b84efe2014-01-15 15:36:59 +01001207 list_del_init(&ifp->if_list);
1208 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
Thomas Haller5b84efe2014-01-15 15:36:59 +01001210 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001212 addrconf_del_dad_work(ifp);
Andrey Vaginb2238562008-07-08 15:13:31 -07001213
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 ipv6_ifa_notify(RTM_DELADDR, ifp);
1215
Cong Wangf88c91d2013-04-14 23:18:43 +08001216 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
Thomas Haller5b84efe2014-01-15 15:36:59 +01001218 if (action != CLEANUP_PREFIX_RT_NOP) {
1219 cleanup_prefix_route(ifp, expires,
1220 action == CLEANUP_PREFIX_RT_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 }
1222
Daniel Walterc3968a82011-04-13 21:10:57 +00001223 /* clean up prefsrc entries */
1224 rt6_remove_prefsrc(ifp);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001225out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 in6_ifa_put(ifp);
1227}
1228
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1230{
1231 struct inet6_dev *idev = ifp->idev;
1232 struct in6_addr addr, *tmpaddr;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001233 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001234 unsigned long regen_advance;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 int tmp_plen;
1236 int ret = 0;
Neil Horman95c385b2007-04-25 17:08:10 -07001237 u32 addr_flags;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001238 unsigned long now = jiffies;
Jiri Bohac76506a92016-10-13 18:52:15 +02001239 long max_desync_factor;
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001240 s32 cnf_temp_preferred_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
Jiri Pirko53bd6742013-12-06 09:45:22 +01001242 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 if (ift) {
1244 spin_lock_bh(&ift->lock);
1245 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1246 spin_unlock_bh(&ift->lock);
1247 tmpaddr = &addr;
1248 } else {
1249 tmpaddr = NULL;
1250 }
1251retry:
1252 in6_dev_hold(idev);
1253 if (idev->cnf.use_tempaddr <= 0) {
Jiri Pirko53bd6742013-12-06 09:45:22 +01001254 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001255 pr_info("%s: use_tempaddr is disabled\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 in6_dev_put(idev);
1257 ret = -1;
1258 goto out;
1259 }
1260 spin_lock_bh(&ifp->lock);
1261 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1262 idev->cnf.use_tempaddr = -1; /*XXX*/
1263 spin_unlock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01001264 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001265 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1266 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 in6_dev_put(idev);
1268 ret = -1;
1269 goto out;
1270 }
1271 in6_ifa_hold(ifp);
1272 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
Jiri Bohac9d6280d2016-10-13 18:50:02 +02001273 ipv6_try_regen_rndid(idev, tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 memcpy(&addr.s6_addr[8], idev->rndid, 8);
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001275 age = (now - ifp->tstamp) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001277 regen_advance = idev->cnf.regen_max_retry *
Ian Morris67ba4152014-08-24 21:53:10 +01001278 idev->cnf.dad_transmits *
1279 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
Jiri Bohac76506a92016-10-13 18:52:15 +02001280
1281 /* recalculate max_desync_factor each time and update
1282 * idev->desync_factor if it's larger
1283 */
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001284 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
Jiri Bohac76506a92016-10-13 18:52:15 +02001285 max_desync_factor = min_t(__u32,
1286 idev->cnf.max_desync_factor,
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001287 cnf_temp_preferred_lft - regen_advance);
Jiri Bohac76506a92016-10-13 18:52:15 +02001288
1289 if (unlikely(idev->desync_factor > max_desync_factor)) {
1290 if (max_desync_factor > 0) {
1291 get_random_bytes(&idev->desync_factor,
1292 sizeof(idev->desync_factor));
1293 idev->desync_factor %= max_desync_factor;
1294 } else {
1295 idev->desync_factor = 0;
1296 }
1297 }
1298
1299 tmp_valid_lft = min_t(__u32,
1300 ifp->valid_lft,
1301 idev->cnf.temp_valid_lft + age);
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001302 tmp_prefered_lft = cnf_temp_preferred_lft + age -
Jiri Bohac76506a92016-10-13 18:52:15 +02001303 idev->desync_factor;
Jiri Bohac76506a92016-10-13 18:52:15 +02001304 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1305 tmp_plen = ifp->prefix_len;
1306 tmp_tstamp = ifp->tstamp;
1307 spin_unlock_bh(&ifp->lock);
1308
Jiri Pirko53bd6742013-12-06 09:45:22 +01001309 write_unlock_bh(&idev->lock);
Neil Horman95c385b2007-04-25 17:08:10 -07001310
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001311 /* A temporary address is created only if this calculated Preferred
1312 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1313 * an implementation must not create a temporary address with a zero
1314 * Preferred Lifetime.
Heiner Kallweitecab6702014-03-12 22:13:19 +01001315 * Use age calculation as in addrconf_verify to avoid unnecessary
1316 * temporary addresses being generated.
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001317 */
Heiner Kallweitecab6702014-03-12 22:13:19 +01001318 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1319 if (tmp_prefered_lft <= regen_advance + age) {
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001320 in6_ifa_put(ifp);
1321 in6_dev_put(idev);
1322 ret = -1;
1323 goto out;
1324 }
1325
Neil Horman95c385b2007-04-25 17:08:10 -07001326 addr_flags = IFA_F_TEMPORARY;
1327 /* set in addrconf_prefix_rcv() */
1328 if (ifp->flags & IFA_F_OPTIMISTIC)
1329 addr_flags |= IFA_F_OPTIMISTIC;
1330
Hannes Frederic Sowa4b08a8f2013-08-16 13:02:27 +02001331 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1332 ipv6_addr_scope(&addr), addr_flags,
1333 tmp_valid_lft, tmp_prefered_lft);
1334 if (IS_ERR(ift)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 in6_ifa_put(ifp);
1336 in6_dev_put(idev);
Joe Perchesf3213832012-05-15 14:11:53 +00001337 pr_info("%s: retry temporary address regeneration\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 tmpaddr = &addr;
Jiri Pirko53bd6742013-12-06 09:45:22 +01001339 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 goto retry;
1341 }
1342
1343 spin_lock_bh(&ift->lock);
1344 ift->ifpub = ifp;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001345 ift->cstamp = now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 ift->tstamp = tmp_tstamp;
1347 spin_unlock_bh(&ift->lock);
1348
David S. Millercf22f9a2012-04-14 21:37:40 -04001349 addrconf_dad_start(ift);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 in6_ifa_put(ift);
1351 in6_dev_put(idev);
1352out:
1353 return ret;
1354}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355
1356/*
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001357 * Choose an appropriate source address (RFC3484)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 */
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001359enum {
1360 IPV6_SADDR_RULE_INIT = 0,
1361 IPV6_SADDR_RULE_LOCAL,
1362 IPV6_SADDR_RULE_SCOPE,
1363 IPV6_SADDR_RULE_PREFERRED,
1364#ifdef CONFIG_IPV6_MIP6
1365 IPV6_SADDR_RULE_HOA,
1366#endif
1367 IPV6_SADDR_RULE_OIF,
1368 IPV6_SADDR_RULE_LABEL,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001369 IPV6_SADDR_RULE_PRIVACY,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001370 IPV6_SADDR_RULE_ORCHID,
1371 IPV6_SADDR_RULE_PREFIX,
Erik Kline7fd25612014-10-28 18:11:14 +09001372#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1373 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1374#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001375 IPV6_SADDR_RULE_MAX
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001376};
1377
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001378struct ipv6_saddr_score {
1379 int rule;
1380 int addr_type;
1381 struct inet6_ifaddr *ifa;
1382 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1383 int scopedist;
1384 int matchlen;
1385};
1386
1387struct ipv6_saddr_dst {
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001388 const struct in6_addr *addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001389 int ifindex;
1390 int scope;
1391 int label;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001392 unsigned int prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001393};
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001394
Dave Jonesb6f99a22007-03-22 12:27:49 -07001395static inline int ipv6_saddr_preferred(int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396{
Ulrich Weber45bb0062010-02-25 23:28:58 +00001397 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001398 return 1;
1399 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400}
1401
Erik Kline7fd25612014-10-28 18:11:14 +09001402static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1403{
1404#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1405 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1406#else
1407 return false;
1408#endif
1409}
1410
Benjamin Thery3de23252008-05-28 14:51:24 +02001411static int ipv6_get_saddr_eval(struct net *net,
1412 struct ipv6_saddr_score *score,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001413 struct ipv6_saddr_dst *dst,
1414 int i)
1415{
1416 int ret;
1417
1418 if (i <= score->rule) {
1419 switch (i) {
1420 case IPV6_SADDR_RULE_SCOPE:
1421 ret = score->scopedist;
1422 break;
1423 case IPV6_SADDR_RULE_PREFIX:
1424 ret = score->matchlen;
1425 break;
1426 default:
1427 ret = !!test_bit(i, score->scorebits);
1428 }
1429 goto out;
1430 }
1431
1432 switch (i) {
1433 case IPV6_SADDR_RULE_INIT:
1434 /* Rule 0: remember if hiscore is not ready yet */
1435 ret = !!score->ifa;
1436 break;
1437 case IPV6_SADDR_RULE_LOCAL:
1438 /* Rule 1: Prefer same address */
1439 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1440 break;
1441 case IPV6_SADDR_RULE_SCOPE:
1442 /* Rule 2: Prefer appropriate scope
1443 *
1444 * ret
1445 * ^
1446 * -1 | d 15
1447 * ---+--+-+---> scope
1448 * |
1449 * | d is scope of the destination.
1450 * B-d | \
1451 * | \ <- smaller scope is better if
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08001452 * B-15 | \ if scope is enough for destination.
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001453 * | ret = B - scope (-1 <= scope >= d <= 15).
1454 * d-C-1 | /
1455 * |/ <- greater is better
1456 * -C / if scope is not enough for destination.
1457 * /| ret = scope - C (-1 <= d < scope <= 15).
1458 *
1459 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1460 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1461 * Assume B = 0 and we get C > 29.
1462 */
1463 ret = __ipv6_addr_src_scope(score->addr_type);
1464 if (ret >= dst->scope)
1465 ret = -ret;
1466 else
1467 ret -= 128; /* 30 is enough */
1468 score->scopedist = ret;
1469 break;
1470 case IPV6_SADDR_RULE_PREFERRED:
Erik Kline7fd25612014-10-28 18:11:14 +09001471 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001472 /* Rule 3: Avoid deprecated and optimistic addresses */
Erik Kline7fd25612014-10-28 18:11:14 +09001473 u8 avoid = IFA_F_DEPRECATED;
1474
1475 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1476 avoid |= IFA_F_OPTIMISTIC;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001477 ret = ipv6_saddr_preferred(score->addr_type) ||
Erik Kline7fd25612014-10-28 18:11:14 +09001478 !(score->ifa->flags & avoid);
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001479 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001480 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001481#ifdef CONFIG_IPV6_MIP6
1482 case IPV6_SADDR_RULE_HOA:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001483 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001484 /* Rule 4: Prefer home address */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001485 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1486 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001487 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001488 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001489#endif
1490 case IPV6_SADDR_RULE_OIF:
1491 /* Rule 5: Prefer outgoing interface */
1492 ret = (!dst->ifindex ||
1493 dst->ifindex == score->ifa->idev->dev->ifindex);
1494 break;
1495 case IPV6_SADDR_RULE_LABEL:
1496 /* Rule 6: Prefer matching label */
Benjamin Thery3de23252008-05-28 14:51:24 +02001497 ret = ipv6_addr_label(net,
1498 &score->ifa->addr, score->addr_type,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001499 score->ifa->idev->dev->ifindex) == dst->label;
1500 break;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001501 case IPV6_SADDR_RULE_PRIVACY:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001502 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001503 /* Rule 7: Prefer public address
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001504 * Note: prefer temporary address if use_tempaddr >= 2
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001505 */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001506 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1507 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1508 score->ifa->idev->cnf.use_tempaddr >= 2;
1509 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001510 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001511 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001512 case IPV6_SADDR_RULE_ORCHID:
1513 /* Rule 8-: Prefer ORCHID vs ORCHID or
1514 * non-ORCHID vs non-ORCHID
1515 */
1516 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1517 ipv6_addr_orchid(dst->addr));
1518 break;
1519 case IPV6_SADDR_RULE_PREFIX:
1520 /* Rule 8: Use longest matching prefix */
YOSHIFUJI Hideaki / 吉藤英明91b4b042012-09-10 18:41:07 +00001521 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1522 if (ret > score->ifa->prefix_len)
1523 ret = score->ifa->prefix_len;
1524 score->matchlen = ret;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001525 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001526#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1527 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1528 /* Optimistic addresses still have lower precedence than other
1529 * preferred addresses.
1530 */
1531 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1532 break;
1533#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001534 default:
1535 ret = 0;
1536 }
1537
1538 if (ret)
1539 __set_bit(i, score->scorebits);
1540 score->rule = i;
1541out:
1542 return ret;
1543}
1544
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001545static int __ipv6_dev_get_saddr(struct net *net,
1546 struct ipv6_saddr_dst *dst,
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001547 struct inet6_dev *idev,
1548 struct ipv6_saddr_score *scores,
1549 int hiscore_idx)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001550{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001551 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001552
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1555 int i;
1556
1557 /*
1558 * - Tentative Address (RFC2462 section 5.4)
1559 * - A tentative address is not considered
1560 * "assigned to an interface" in the traditional
1561 * sense, unless it is also flagged as optimistic.
1562 * - Candidate Source Address (section 4)
1563 * - In any case, anycast addresses, multicast
1564 * addresses, and the unspecified address MUST
1565 * NOT be included in a candidate set.
1566 */
1567 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1568 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1569 continue;
1570
1571 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1572
1573 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1574 score->addr_type & IPV6_ADDR_MULTICAST)) {
1575 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1576 idev->dev->name);
1577 continue;
1578 }
1579
1580 score->rule = -1;
1581 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1582
1583 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1584 int minihiscore, miniscore;
1585
1586 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1587 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1588
1589 if (minihiscore > miniscore) {
1590 if (i == IPV6_SADDR_RULE_SCOPE &&
1591 score->scopedist > 0) {
1592 /*
1593 * special case:
1594 * each remaining entry
1595 * has too small (not enough)
1596 * scope, because ifa entries
1597 * are sorted by their scope
1598 * values.
1599 */
1600 goto out;
1601 }
1602 break;
1603 } else if (minihiscore < miniscore) {
1604 if (hiscore->ifa)
1605 in6_ifa_put(hiscore->ifa);
1606
1607 in6_ifa_hold(score->ifa);
1608
1609 swap(hiscore, score);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001610 hiscore_idx = 1 - hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001611
1612 /* restore our iterator */
1613 score->ifa = hiscore->ifa;
1614
1615 break;
1616 }
1617 }
1618 }
1619out:
1620 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001621 return hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001622}
1623
David Ahernafbac6012016-06-16 16:24:26 -07001624static int ipv6_get_saddr_master(struct net *net,
1625 const struct net_device *dst_dev,
1626 const struct net_device *master,
1627 struct ipv6_saddr_dst *dst,
1628 struct ipv6_saddr_score *scores,
1629 int hiscore_idx)
1630{
1631 struct inet6_dev *idev;
1632
1633 idev = __in6_dev_get(dst_dev);
1634 if (idev)
1635 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1636 scores, hiscore_idx);
1637
1638 idev = __in6_dev_get(master);
1639 if (idev)
1640 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1641 scores, hiscore_idx);
1642
1643 return hiscore_idx;
1644}
1645
Patrick McHardyb3f644f2012-08-26 19:14:14 +02001646int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001647 const struct in6_addr *daddr, unsigned int prefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001648 struct in6_addr *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001650 struct ipv6_saddr_score scores[2], *hiscore;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001651 struct ipv6_saddr_dst dst;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001652 struct inet6_dev *idev;
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001653 struct net_device *dev;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001654 int dst_type;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001655 bool use_oif_addr = false;
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001656 int hiscore_idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001658 dst_type = __ipv6_addr_type(daddr);
1659 dst.addr = daddr;
1660 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1661 dst.scope = __ipv6_addr_src_scope(dst_type);
Benjamin Thery3de23252008-05-28 14:51:24 +02001662 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001663 dst.prefs = prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001664
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001665 scores[hiscore_idx].rule = -1;
1666 scores[hiscore_idx].ifa = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001668 rcu_read_lock();
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001669
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001670 /* Candidate Source Address (section 4)
1671 * - multicast and link-local destination address,
1672 * the set of candidate source address MUST only
1673 * include addresses assigned to interfaces
1674 * belonging to the same link as the outgoing
1675 * interface.
1676 * (- For site-local destination addresses, the
1677 * set of candidate source addresses MUST only
1678 * include addresses assigned to interfaces
1679 * belonging to the same site as the outgoing
1680 * interface.)
Erik Kline3985e8a2015-07-22 16:38:25 +09001681 * - "It is RECOMMENDED that the candidate source addresses
1682 * be the set of unicast addresses assigned to the
1683 * interface that will be used to send to the destination
1684 * (the 'outgoing' interface)." (RFC 6724)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001685 */
1686 if (dst_dev) {
Erik Kline3985e8a2015-07-22 16:38:25 +09001687 idev = __in6_dev_get(dst_dev);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001688 if ((dst_type & IPV6_ADDR_MULTICAST) ||
Erik Kline3985e8a2015-07-22 16:38:25 +09001689 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1690 (idev && idev->cnf.use_oif_addrs_only)) {
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001691 use_oif_addr = true;
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001692 }
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001693 }
1694
1695 if (use_oif_addr) {
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001696 if (idev)
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001697 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001698 } else {
David Ahernafbac6012016-06-16 16:24:26 -07001699 const struct net_device *master;
1700 int master_idx = 0;
1701
1702 /* if dst_dev exists and is enslaved to an L3 device, then
1703 * prefer addresses from dst_dev and then the master over
1704 * any other enslaved devices in the L3 domain.
1705 */
1706 master = l3mdev_master_dev_rcu(dst_dev);
1707 if (master) {
1708 master_idx = master->ifindex;
1709
1710 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1711 master, &dst,
1712 scores, hiscore_idx);
1713
1714 if (scores[hiscore_idx].ifa)
1715 goto out;
1716 }
1717
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001718 for_each_netdev_rcu(net, dev) {
David Ahernafbac6012016-06-16 16:24:26 -07001719 /* only consider addresses on devices in the
1720 * same L3 domain
1721 */
1722 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1723 continue;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001724 idev = __in6_dev_get(dev);
1725 if (!idev)
1726 continue;
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001727 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001728 }
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001729 }
David Ahernafbac6012016-06-16 16:24:26 -07001730
1731out:
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001732 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001734 hiscore = &scores[hiscore_idx];
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001735 if (!hiscore->ifa)
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001736 return -EADDRNOTAVAIL;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001737
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001738 *saddr = hiscore->ifa->addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001739 in6_ifa_put(hiscore->ifa);
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001740 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741}
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +09001742EXPORT_SYMBOL(ipv6_dev_get_saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
Amerigo Wang89657792013-06-29 21:30:49 +08001744int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001745 u32 banned_flags)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001746{
1747 struct inet6_ifaddr *ifp;
1748 int err = -EADDRNOTAVAIL;
1749
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01001750 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1751 if (ifp->scope > IFA_LINK)
1752 break;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001753 if (ifp->scope == IFA_LINK &&
1754 !(ifp->flags & banned_flags)) {
1755 *addr = ifp->addr;
1756 err = 0;
1757 break;
1758 }
1759 }
1760 return err;
1761}
1762
Neil Horman95c385b2007-04-25 17:08:10 -07001763int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001764 u32 banned_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765{
1766 struct inet6_dev *idev;
1767 int err = -EADDRNOTAVAIL;
1768
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001769 rcu_read_lock();
Stephen Hemmingere21e8462010-03-20 16:09:01 -07001770 idev = __in6_dev_get(dev);
1771 if (idev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 read_lock_bh(&idev->lock);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001773 err = __ipv6_get_lladdr(idev, addr, banned_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 read_unlock_bh(&idev->lock);
1775 }
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001776 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 return err;
1778}
1779
1780static int ipv6_count_addresses(struct inet6_dev *idev)
1781{
1782 int cnt = 0;
1783 struct inet6_ifaddr *ifp;
1784
1785 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001786 list_for_each_entry(ifp, &idev->addr_list, if_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 cnt++;
1788 read_unlock_bh(&idev->lock);
1789 return cnt;
1790}
1791
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001792int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
Florian Westphal2a7851b2013-05-17 03:56:10 +00001793 const struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794{
Erik Klinec58da4c2015-02-04 20:01:23 +09001795 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1796}
1797EXPORT_SYMBOL(ipv6_chk_addr);
1798
1799int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1800 const struct net_device *dev, int strict,
1801 u32 banned_flags)
1802{
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001803 struct inet6_ifaddr *ifp;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001804 unsigned int hash = inet6_addr_hash(addr);
Erik Klinec58da4c2015-02-04 20:01:23 +09001805 u32 ifp_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806
stephen hemminger5c578aed2010-03-17 20:31:11 +00001807 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001808 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001809 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcanobfeade02008-01-10 22:43:18 -08001810 continue;
Erik Klinec58da4c2015-02-04 20:01:23 +09001811 /* Decouple optimistic from tentative for evaluation here.
1812 * Ban optimistic addresses explicitly, when required.
1813 */
1814 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1815 ? (ifp->flags&~IFA_F_TENTATIVE)
1816 : ifp->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 if (ipv6_addr_equal(&ifp->addr, addr) &&
Erik Klinec58da4c2015-02-04 20:01:23 +09001818 !(ifp_flags&banned_flags) &&
Ian Morris63159f22015-03-29 14:00:04 +01001819 (!dev || ifp->idev->dev == dev ||
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001820 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1821 rcu_read_unlock_bh();
1822 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 }
1824 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001825
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001826 rcu_read_unlock_bh();
1827 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828}
Erik Klinec58da4c2015-02-04 20:01:23 +09001829EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +09001830
David S. Miller3e81c6d2010-03-20 16:18:00 -07001831static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1832 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833{
Eric Dumazetddbe5032012-07-18 08:11:12 +00001834 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00001835 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836
Sasha Levinb67bfe02013-02-27 17:06:00 -08001837 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001838 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano06bfe652008-01-10 22:43:42 -08001839 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001841 if (!dev || ifp->idev->dev == dev)
David S. Miller3e81c6d2010-03-20 16:18:00 -07001842 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 }
1844 }
David S. Miller3e81c6d2010-03-20 16:18:00 -07001845 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846}
1847
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001848/* Compares an address/prefix_len with addresses on device @dev.
1849 * If one is found it returns true.
1850 */
1851bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1852 const unsigned int prefix_len, struct net_device *dev)
1853{
1854 struct inet6_dev *idev;
1855 struct inet6_ifaddr *ifa;
1856 bool ret = false;
1857
1858 rcu_read_lock();
1859 idev = __in6_dev_get(dev);
1860 if (idev) {
1861 read_lock_bh(&idev->lock);
1862 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1863 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1864 if (ret)
1865 break;
1866 }
1867 read_unlock_bh(&idev->lock);
1868 }
1869 rcu_read_unlock();
1870
1871 return ret;
1872}
1873EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1874
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001875int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001876{
1877 struct inet6_dev *idev;
1878 struct inet6_ifaddr *ifa;
1879 int onlink;
1880
1881 onlink = 0;
1882 rcu_read_lock();
1883 idev = __in6_dev_get(dev);
1884 if (idev) {
1885 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001886 list_for_each_entry(ifa, &idev->addr_list, if_list) {
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001887 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1888 ifa->prefix_len);
1889 if (onlink)
1890 break;
1891 }
1892 read_unlock_bh(&idev->lock);
1893 }
1894 rcu_read_unlock();
1895 return onlink;
1896}
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001897EXPORT_SYMBOL(ipv6_chk_prefix);
1898
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001899struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001900 struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901{
David S. Millerb79d1d52010-03-25 21:39:21 -07001902 struct inet6_ifaddr *ifp, *result = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001903 unsigned int hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904
stephen hemminger5c578aed2010-03-17 20:31:11 +00001905 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001906 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001907 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001908 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001910 if (!dev || ifp->idev->dev == dev ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
David S. Millerb79d1d52010-03-25 21:39:21 -07001912 result = ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 in6_ifa_hold(ifp);
1914 break;
1915 }
1916 }
1917 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001918 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919
David S. Millerb79d1d52010-03-25 21:39:21 -07001920 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921}
1922
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923/* Gets referenced address, destroys ifaddr */
1924
Brian Haleycc411d02009-09-09 14:41:32 +00001925static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926{
Lubomir Rintel3d171f32016-01-08 13:47:23 +01001927 if (dad_failed)
1928 ifp->flags |= IFA_F_DADFAILED;
1929
Sabrina Dubrocaec8add22017-06-29 16:56:54 +02001930 if (ifp->flags&IFA_F_TEMPORARY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 struct inet6_ifaddr *ifpub;
1932 spin_lock_bh(&ifp->lock);
1933 ifpub = ifp->ifpub;
1934 if (ifpub) {
1935 in6_ifa_hold(ifpub);
1936 spin_unlock_bh(&ifp->lock);
1937 ipv6_create_tempaddr(ifpub, ifp);
1938 in6_ifa_put(ifpub);
1939 } else {
1940 spin_unlock_bh(&ifp->lock);
1941 }
1942 ipv6_del_addr(ifp);
Sabrina Dubrocaec8add22017-06-29 16:56:54 +02001943 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1944 spin_lock_bh(&ifp->lock);
1945 addrconf_del_dad_work(ifp);
1946 ifp->flags |= IFA_F_TENTATIVE;
1947 spin_unlock_bh(&ifp->lock);
1948 if (dad_failed)
1949 ipv6_ifa_notify(0, ifp);
1950 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001951 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 ipv6_del_addr(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001953 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954}
1955
Herbert Xuf2344a12010-05-18 15:55:27 -07001956static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1957{
1958 int err = -ENOENT;
1959
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001960 spin_lock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001961 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1962 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1963 err = 0;
1964 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001965 spin_unlock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001966
1967 return err;
1968}
1969
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09001970void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1971{
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001972 struct inet6_dev *idev = ifp->idev;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001973 struct net *net = dev_net(ifp->idev->dev);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001974
Ursula Braun853dc2e2010-10-24 23:06:43 +00001975 if (addrconf_dad_end(ifp)) {
1976 in6_ifa_put(ifp);
Herbert Xuf2344a12010-05-18 15:55:27 -07001977 return;
Ursula Braun853dc2e2010-10-24 23:06:43 +00001978 }
Herbert Xuf2344a12010-05-18 15:55:27 -07001979
Joe Perchese87cc472012-05-13 21:56:26 +00001980 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1981 ifp->idev->dev->name, &ifp->addr);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001982
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001983 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001984
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001985 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1986 int scope = ifp->scope;
1987 u32 flags = ifp->flags;
1988 struct in6_addr new_addr;
1989 struct inet6_ifaddr *ifp2;
1990 u32 valid_lft, preferred_lft;
1991 int pfxlen = ifp->prefix_len;
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001992 int retries = ifp->stable_privacy_retry + 1;
1993
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001994 if (retries > net->ipv6.sysctl.idgen_retries) {
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001995 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1996 ifp->idev->dev->name);
1997 goto errdad;
1998 }
1999
2000 new_addr = ifp->addr;
2001 if (ipv6_generate_stable_address(&new_addr, retries,
2002 idev))
2003 goto errdad;
2004
2005 valid_lft = ifp->valid_lft;
2006 preferred_lft = ifp->prefered_lft;
2007
2008 spin_unlock_bh(&ifp->lock);
2009
2010 if (idev->cnf.max_addresses &&
2011 ipv6_count_addresses(idev) >=
2012 idev->cnf.max_addresses)
2013 goto lock_errdad;
2014
2015 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2016 ifp->idev->dev->name);
2017
2018 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2019 scope, flags, valid_lft,
2020 preferred_lft);
2021 if (IS_ERR(ifp2))
2022 goto lock_errdad;
2023
2024 spin_lock_bh(&ifp2->lock);
2025 ifp2->stable_privacy_retry = retries;
2026 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2027 spin_unlock_bh(&ifp2->lock);
2028
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01002029 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002030 in6_ifa_put(ifp2);
2031lock_errdad:
2032 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09002033 }
2034
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002035errdad:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002036 /* transition from _POSTDAD to _ERRDAD */
2037 ifp->state = INET6_IFADDR_STATE_ERRDAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01002038 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002039
2040 addrconf_mod_dad_work(ifp, 0);
Wei Yongjun751eb6b2016-09-05 16:06:31 +08002041 in6_ifa_put(ifp);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09002042}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002044/* Join to solicited addr multicast group.
2045 * caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002046void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047{
2048 struct in6_addr maddr;
2049
2050 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2051 return;
2052
2053 addrconf_addr_solict_mult(addr, &maddr);
2054 ipv6_dev_mc_inc(dev, &maddr);
2055}
2056
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002057/* caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002058void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059{
2060 struct in6_addr maddr;
2061
2062 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2063 return;
2064
2065 addrconf_addr_solict_mult(addr, &maddr);
2066 __ipv6_dev_mc_dec(idev, &maddr);
2067}
2068
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002069/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002070static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071{
2072 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002073
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002074 if (ifp->prefix_len >= 127) /* RFC 6164 */
Bjørn Mork2bda8a02011-07-05 23:04:13 +00002075 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2077 if (ipv6_addr_any(&addr))
2078 return;
WANG Cong013b4d92014-09-11 15:35:11 -07002079 __ipv6_dev_ac_inc(ifp->idev, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080}
2081
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002082/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002083static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084{
2085 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002086
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002087 if (ifp->prefix_len >= 127) /* RFC 6164 */
YOSHIFUJI Hideaki32019e62011-07-24 11:44:34 +00002088 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2090 if (ipv6_addr_any(&addr))
2091 return;
2092 __ipv6_dev_ac_dec(ifp->idev, &addr);
2093}
2094
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002095static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002096{
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002097 switch (dev->addr_len) {
2098 case ETH_ALEN:
Luiz Augusto von Dentz9dae2e02017-03-12 10:19:38 +02002099 memcpy(eui, dev->dev_addr, 3);
2100 eui[3] = 0xFF;
2101 eui[4] = 0xFE;
2102 memcpy(eui + 5, dev->dev_addr + 3, 3);
2103 break;
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002104 case EUI64_ADDR_LEN:
2105 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2106 eui[0] ^= 2;
2107 break;
2108 default:
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002109 return -1;
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002110 }
2111
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002112 return 0;
2113}
2114
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002115static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2116{
2117 union fwnet_hwaddr *ha;
2118
2119 if (dev->addr_len != FWNET_ALEN)
2120 return -1;
2121
2122 ha = (union fwnet_hwaddr *)dev->dev_addr;
2123
2124 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2125 eui[0] ^= 2;
2126 return 0;
2127}
2128
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002129static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2130{
2131 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2132 if (dev->addr_len != ARCNET_ALEN)
2133 return -1;
2134 memset(eui, 0, 7);
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002135 eui[7] = *(u8 *)dev->dev_addr;
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002136 return 0;
2137}
2138
2139static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2140{
2141 if (dev->addr_len != INFINIBAND_ALEN)
2142 return -1;
2143 memcpy(eui, dev->dev_addr + 12, 8);
2144 eui[0] |= 2;
2145 return 0;
2146}
2147
stephen hemmingerc61393e2010-10-04 20:17:53 +00002148static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002149{
Sascha Hlusiak9af28512009-05-19 12:56:51 +00002150 if (addr == 0)
2151 return -1;
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002152 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2153 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2154 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2155 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2156 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2157 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2158 eui[1] = 0;
2159 eui[2] = 0x5E;
2160 eui[3] = 0xFE;
2161 memcpy(eui + 4, &addr, 4);
2162 return 0;
2163}
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002164
2165static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2166{
2167 if (dev->priv_flags & IFF_ISATAP)
2168 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2169 return -1;
2170}
2171
stephen hemmingeraee80b52011-06-08 10:44:30 +00002172static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2173{
2174 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2175}
2176
Nicolas Dichtele8377352013-08-20 12:16:06 +02002177static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2178{
2179 memcpy(eui, dev->perm_addr, 3);
2180 memcpy(eui + 5, dev->perm_addr + 3, 3);
2181 eui[3] = 0xFF;
2182 eui[4] = 0xFE;
2183 eui[0] ^= 2;
2184 return 0;
2185}
2186
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2188{
2189 switch (dev->type) {
2190 case ARPHRD_ETHER:
2191 case ARPHRD_FDDI:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002192 return addrconf_ifid_eui48(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193 case ARPHRD_ARCNET:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002194 return addrconf_ifid_arcnet(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195 case ARPHRD_INFINIBAND:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002196 return addrconf_ifid_infiniband(eui, dev);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002197 case ARPHRD_SIT:
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002198 return addrconf_ifid_sit(eui, dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00002199 case ARPHRD_IPGRE:
Felix Jia45ce0fd2017-01-26 16:59:18 +13002200 case ARPHRD_TUNNEL:
stephen hemmingeraee80b52011-06-08 10:44:30 +00002201 return addrconf_ifid_gre(eui, dev);
Jukka Rissanene74bccb82013-12-11 17:05:36 +02002202 case ARPHRD_6LOWPAN:
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002203 return addrconf_ifid_6lowpan(eui, dev);
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002204 case ARPHRD_IEEE1394:
2205 return addrconf_ifid_ieee1394(eui, dev);
Nicolas Dichtele8377352013-08-20 12:16:06 +02002206 case ARPHRD_TUNNEL6:
Felix Jia45ce0fd2017-01-26 16:59:18 +13002207 case ARPHRD_IP6GRE:
Nicolas Dichtele8377352013-08-20 12:16:06 +02002208 return addrconf_ifid_ip6tnl(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 }
2210 return -1;
2211}
2212
2213static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2214{
2215 int err = -1;
2216 struct inet6_ifaddr *ifp;
2217
2218 read_lock_bh(&idev->lock);
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01002219 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2220 if (ifp->scope > IFA_LINK)
2221 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2223 memcpy(eui, ifp->addr.s6_addr+8, 8);
2224 err = 0;
2225 break;
2226 }
2227 }
2228 read_unlock_bh(&idev->lock);
2229 return err;
2230}
2231
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002233static void ipv6_regen_rndid(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235regen:
YOSHIFUJI Hideaki955189e2006-03-20 16:54:09 -08002236 get_random_bytes(idev->rndid, sizeof(idev->rndid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 idev->rndid[0] &= ~0x02;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238
2239 /*
2240 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2241 * check if generated address is not inappropriate
2242 *
2243 * - Reserved subnet anycast (RFC 2526)
2244 * 11111101 11....11 1xxxxxxx
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002245 * - ISATAP (RFC4214) 6.1
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246 * 00-00-5E-FE-xx-xx-xx-xx
2247 * - value 0
2248 * - XXX: already assigned to an address on the device
2249 */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002250 if (idev->rndid[0] == 0xfd &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2252 (idev->rndid[7]&0x80))
2253 goto regen;
2254 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2255 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2256 goto regen;
2257 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2258 goto regen;
2259 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260}
2261
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002262static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002263{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002265 ipv6_regen_rndid(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267
2268/*
2269 * Add prefix route.
2270 */
2271
2272static void
2273addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07002274 unsigned long expires, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275{
Thomas Graf86872cb2006-08-22 00:01:08 -07002276 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002277 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
Thomas Graf86872cb2006-08-22 00:01:08 -07002278 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2279 .fc_ifindex = dev->ifindex,
2280 .fc_expires = expires,
2281 .fc_dst_len = plen,
2282 .fc_flags = RTF_UP | flags,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002283 .fc_nlinfo.nl_net = dev_net(dev),
Stephen Hemmingerf410a1f2008-08-23 05:16:46 -07002284 .fc_protocol = RTPROT_KERNEL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002285 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00002287 cfg.fc_dst = *pfx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288
2289 /* Prevent useless cloning on PtP SIT.
2290 This thing is done here expecting that the whole
2291 class of non-broadcast devices need not cloning.
2292 */
Amerigo Wang07a93622012-10-29 16:23:10 +00002293#if IS_ENABLED(CONFIG_IPV6_SIT)
Thomas Graf86872cb2006-08-22 00:01:08 -07002294 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2295 cfg.fc_flags |= RTF_NONEXTHOP;
Joerg Roedel0be669b2006-10-10 14:49:53 -07002296#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297
David Ahern333c4302017-05-21 10:12:04 -06002298 ip6_route_add(&cfg, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299}
2300
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002301
2302static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2303 int plen,
2304 const struct net_device *dev,
2305 u32 flags, u32 noflags)
2306{
2307 struct fib6_node *fn;
2308 struct rt6_info *rt = NULL;
2309 struct fib6_table *table;
David Ahernca254492015-10-12 11:47:10 -07002310 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002311
David Ahernca254492015-10-12 11:47:10 -07002312 table = fib6_get_table(dev_net(dev), tb_id);
Ian Morris63159f22015-03-29 14:00:04 +01002313 if (!table)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002314 return NULL;
2315
Li RongQing5744dd92012-09-11 21:59:01 +00002316 read_lock_bh(&table->tb6_lock);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002317 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2318 if (!fn)
2319 goto out;
Martin KaFai Lau1f56a012015-04-28 13:03:03 -07002320
2321 noflags |= RTF_CACHE;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002322 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
David S. Millerd1918542011-12-28 20:19:20 -05002323 if (rt->dst.dev->ifindex != dev->ifindex)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002324 continue;
2325 if ((rt->rt6i_flags & flags) != flags)
2326 continue;
Romain Kuntz85da53b2013-01-09 15:02:26 +01002327 if ((rt->rt6i_flags & noflags) != 0)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002328 continue;
2329 dst_hold(&rt->dst);
2330 break;
2331 }
2332out:
Li RongQing5744dd92012-09-11 21:59:01 +00002333 read_unlock_bh(&table->tb6_lock);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002334 return rt;
2335}
2336
2337
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338/* Create "default" multicast route to the interface */
2339
2340static void addrconf_add_mroute(struct net_device *dev)
2341{
Thomas Graf86872cb2006-08-22 00:01:08 -07002342 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002343 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002344 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2345 .fc_ifindex = dev->ifindex,
2346 .fc_dst_len = 8,
2347 .fc_flags = RTF_UP,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002348 .fc_nlinfo.nl_net = dev_net(dev),
Thomas Graf86872cb2006-08-22 00:01:08 -07002349 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350
Thomas Graf86872cb2006-08-22 00:01:08 -07002351 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2352
David Ahern333c4302017-05-21 10:12:04 -06002353 ip6_route_add(&cfg, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354}
2355
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2357{
2358 struct inet6_dev *idev;
2359
2360 ASSERT_RTNL();
2361
Stephen Hemmingere21e8462010-03-20 16:09:01 -07002362 idev = ipv6_find_idev(dev);
2363 if (!idev)
Brian Haley64e724f2010-07-20 10:34:30 +00002364 return ERR_PTR(-ENOBUFS);
2365
2366 if (idev->cnf.disable_ipv6)
2367 return ERR_PTR(-EACCES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368
2369 /* Add default multicast route */
David Ahernba46ee42016-06-13 13:44:18 -07002370 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
Li Wei4af04ab2011-12-06 21:23:45 +00002371 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 return idev;
2374}
2375
Jiri Pirko53bd6742013-12-06 09:45:22 +01002376static void manage_tempaddrs(struct inet6_dev *idev,
2377 struct inet6_ifaddr *ifp,
2378 __u32 valid_lft, __u32 prefered_lft,
2379 bool create, unsigned long now)
2380{
2381 u32 flags;
2382 struct inet6_ifaddr *ift;
2383
2384 read_lock_bh(&idev->lock);
2385 /* update all temporary addresses in the list */
2386 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2387 int age, max_valid, max_prefered;
2388
2389 if (ifp != ift->ifpub)
2390 continue;
2391
2392 /* RFC 4941 section 3.3:
2393 * If a received option will extend the lifetime of a public
2394 * address, the lifetimes of temporary addresses should
2395 * be extended, subject to the overall constraint that no
2396 * temporary addresses should ever remain "valid" or "preferred"
2397 * for a time longer than (TEMP_VALID_LIFETIME) or
2398 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2399 */
2400 age = (now - ift->cstamp) / HZ;
2401 max_valid = idev->cnf.temp_valid_lft - age;
2402 if (max_valid < 0)
2403 max_valid = 0;
2404
2405 max_prefered = idev->cnf.temp_prefered_lft -
Jiri Bohac76506a92016-10-13 18:52:15 +02002406 idev->desync_factor - age;
Jiri Pirko53bd6742013-12-06 09:45:22 +01002407 if (max_prefered < 0)
2408 max_prefered = 0;
2409
2410 if (valid_lft > max_valid)
2411 valid_lft = max_valid;
2412
2413 if (prefered_lft > max_prefered)
2414 prefered_lft = max_prefered;
2415
2416 spin_lock(&ift->lock);
2417 flags = ift->flags;
2418 ift->valid_lft = valid_lft;
2419 ift->prefered_lft = prefered_lft;
2420 ift->tstamp = now;
2421 if (prefered_lft > 0)
2422 ift->flags &= ~IFA_F_DEPRECATED;
2423
2424 spin_unlock(&ift->lock);
2425 if (!(flags&IFA_F_TENTATIVE))
2426 ipv6_ifa_notify(0, ift);
2427 }
2428
2429 if ((create || list_empty(&idev->tempaddr_list)) &&
2430 idev->cnf.use_tempaddr > 0) {
2431 /* When a new public address is created as described
2432 * in [ADDRCONF], also create a new temporary address.
2433 * Also create a temporary address if it's enabled but
2434 * no temporary address currently exists.
2435 */
2436 read_unlock_bh(&idev->lock);
2437 ipv6_create_tempaddr(ifp, NULL);
2438 } else {
2439 read_unlock_bh(&idev->lock);
2440 }
2441}
2442
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002443static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2444{
Felix Jiad35a00b2017-01-26 16:59:17 +13002445 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2446 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002447}
2448
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002449int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2450 const struct prefix_info *pinfo,
2451 struct inet6_dev *in6_dev,
2452 const struct in6_addr *addr, int addr_type,
2453 u32 addr_flags, bool sllao, bool tokenized,
2454 __u32 valid_lft, u32 prefered_lft)
Alexander Aring4f672232016-06-15 21:20:22 +02002455{
2456 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2457 int create = 0, update_lft = 0;
2458
2459 if (!ifp && valid_lft) {
2460 int max_addresses = in6_dev->cnf.max_addresses;
2461
2462#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2463 if (in6_dev->cnf.optimistic_dad &&
2464 !net->ipv6.devconf_all->forwarding && sllao)
2465 addr_flags |= IFA_F_OPTIMISTIC;
2466#endif
2467
2468 /* Do not allow to create too much of autoconfigured
2469 * addresses; this would be too easy way to crash kernel.
2470 */
2471 if (!max_addresses ||
2472 ipv6_count_addresses(in6_dev) < max_addresses)
2473 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2474 pinfo->prefix_len,
2475 addr_type&IPV6_ADDR_SCOPE_MASK,
2476 addr_flags, valid_lft,
2477 prefered_lft);
2478
2479 if (IS_ERR_OR_NULL(ifp))
2480 return -1;
2481
2482 update_lft = 0;
2483 create = 1;
2484 spin_lock_bh(&ifp->lock);
2485 ifp->flags |= IFA_F_MANAGETEMPADDR;
2486 ifp->cstamp = jiffies;
2487 ifp->tokenized = tokenized;
2488 spin_unlock_bh(&ifp->lock);
2489 addrconf_dad_start(ifp);
2490 }
2491
2492 if (ifp) {
2493 u32 flags;
2494 unsigned long now;
2495 u32 stored_lft;
2496
2497 /* update lifetime (RFC2462 5.5.3 e) */
2498 spin_lock_bh(&ifp->lock);
2499 now = jiffies;
2500 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2501 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2502 else
2503 stored_lft = 0;
2504 if (!update_lft && !create && stored_lft) {
2505 const u32 minimum_lft = min_t(u32,
2506 stored_lft, MIN_VALID_LIFETIME);
2507 valid_lft = max(valid_lft, minimum_lft);
2508
2509 /* RFC4862 Section 5.5.3e:
2510 * "Note that the preferred lifetime of the
2511 * corresponding address is always reset to
2512 * the Preferred Lifetime in the received
2513 * Prefix Information option, regardless of
2514 * whether the valid lifetime is also reset or
2515 * ignored."
2516 *
2517 * So we should always update prefered_lft here.
2518 */
2519 update_lft = 1;
2520 }
2521
2522 if (update_lft) {
2523 ifp->valid_lft = valid_lft;
2524 ifp->prefered_lft = prefered_lft;
2525 ifp->tstamp = now;
2526 flags = ifp->flags;
2527 ifp->flags &= ~IFA_F_DEPRECATED;
2528 spin_unlock_bh(&ifp->lock);
2529
2530 if (!(flags&IFA_F_TENTATIVE))
2531 ipv6_ifa_notify(0, ifp);
2532 } else
2533 spin_unlock_bh(&ifp->lock);
2534
2535 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2536 create, now);
2537
2538 in6_ifa_put(ifp);
2539 addrconf_verify();
2540 }
2541
2542 return 0;
2543}
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002544EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
Alexander Aring4f672232016-06-15 21:20:22 +02002545
Neil Hormane6bff992012-01-04 10:49:15 +00002546void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547{
2548 struct prefix_info *pinfo;
2549 __u32 valid_lft;
2550 __u32 prefered_lft;
Alexander Aring4f672232016-06-15 21:20:22 +02002551 int addr_type, err;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002552 u32 addr_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553 struct inet6_dev *in6_dev;
Brian Haley56d417b2009-06-01 03:07:33 -07002554 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555
2556 pinfo = (struct prefix_info *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002557
Linus Torvalds1da177e2005-04-16 15:20:36 -07002558 if (len < sizeof(struct prefix_info)) {
dingtianhongba3542e2013-08-17 10:27:04 +08002559 ADBG("addrconf: prefix option too short\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 return;
2561 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002562
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 /*
2564 * Validation checks ([ADDRCONF], page 19)
2565 */
2566
2567 addr_type = ipv6_addr_type(&pinfo->prefix);
2568
2569 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2570 return;
2571
2572 valid_lft = ntohl(pinfo->valid);
2573 prefered_lft = ntohl(pinfo->prefered);
2574
2575 if (prefered_lft > valid_lft) {
Joe Perchese87cc472012-05-13 21:56:26 +00002576 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 return;
2578 }
2579
2580 in6_dev = in6_dev_get(dev);
2581
Ian Morris63159f22015-03-29 14:00:04 +01002582 if (!in6_dev) {
Joe Perchese87cc472012-05-13 21:56:26 +00002583 net_dbg_ratelimited("addrconf: device %s not configured\n",
2584 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 return;
2586 }
2587
2588 /*
2589 * Two things going on here:
2590 * 1) Add routes for on-link prefixes
2591 * 2) Configure prefixes with the auto flag set
2592 */
2593
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002594 if (pinfo->onlink) {
2595 struct rt6_info *rt;
2596 unsigned long rt_expires;
2597
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002598 /* Avoid arithmetic overflow. Really, we could
2599 * save rt_expires in seconds, likely valid_lft,
2600 * but it would require division in fib gc, that it
2601 * not good.
2602 */
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002603 if (HZ > USER_HZ)
2604 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2605 else
2606 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
YOSHIFUJI Hideaki3dd4bc62005-12-19 14:02:45 -08002607
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002608 if (addrconf_finite_timeout(rt_expires))
2609 rt_expires *= HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002611 rt = addrconf_get_prefix_route(&pinfo->prefix,
2612 pinfo->prefix_len,
2613 dev,
2614 RTF_ADDRCONF | RTF_PREFIX_RT,
2615 RTF_GATEWAY | RTF_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002617 if (rt) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002618 /* Autoconf prefix route */
2619 if (valid_lft == 0) {
2620 ip6_del_rt(rt);
2621 rt = NULL;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002622 } else if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002623 /* not infinity */
Gao feng1716a962012-04-06 00:13:10 +00002624 rt6_set_expires(rt, jiffies + rt_expires);
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002625 } else {
Gao feng1716a962012-04-06 00:13:10 +00002626 rt6_clean_expires(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 }
2628 } else if (valid_lft) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002629 clock_t expires = 0;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002630 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2631 if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002632 /* not infinity */
2633 flags |= RTF_EXPIRES;
2634 expires = jiffies_to_clock_t(rt_expires);
2635 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002637 dev, expires, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00002639 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 }
2641
2642 /* Try to figure out our local address for this prefix */
2643
2644 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002645 struct in6_addr addr;
Alexander Aringf997c552016-06-15 21:20:23 +02002646 bool tokenized = false, dev_addr_generated = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647
2648 if (pinfo->prefix_len == 64) {
2649 memcpy(&addr, &pinfo->prefix, 8);
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002650
2651 if (!ipv6_addr_any(&in6_dev->token)) {
2652 read_lock_bh(&in6_dev->lock);
2653 memcpy(addr.s6_addr + 8,
2654 in6_dev->token.s6_addr + 8, 8);
2655 read_unlock_bh(&in6_dev->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00002656 tokenized = true;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002657 } else if (is_addr_mode_generate_stable(in6_dev) &&
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01002658 !ipv6_generate_stable_address(&addr, 0,
2659 in6_dev)) {
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002660 addr_flags |= IFA_F_STABLE_PRIVACY;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01002661 goto ok;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002662 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2663 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
Alexander Aring4f672232016-06-15 21:20:22 +02002664 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002665 } else {
2666 dev_addr_generated = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667 }
2668 goto ok;
2669 }
Joe Perchese87cc472012-05-13 21:56:26 +00002670 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2671 pinfo->prefix_len);
Alexander Aring4f672232016-06-15 21:20:22 +02002672 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673
2674ok:
Alexander Aring4f672232016-06-15 21:20:22 +02002675 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2676 &addr, addr_type,
2677 addr_flags, sllao,
2678 tokenized, valid_lft,
2679 prefered_lft);
2680 if (err)
2681 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002682
2683 /* Ignore error case here because previous prefix add addr was
2684 * successful which will be notified.
2685 */
2686 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2687 addr_type, addr_flags, sllao,
2688 tokenized, valid_lft,
2689 prefered_lft,
2690 dev_addr_generated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691 }
2692 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
Alexander Aring4f672232016-06-15 21:20:22 +02002693put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694 in6_dev_put(in6_dev);
2695}
2696
2697/*
2698 * Set destination address.
2699 * Special case for SIT interfaces where we create a new "virtual"
2700 * device.
2701 */
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002702int addrconf_set_dstaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002703{
2704 struct in6_ifreq ireq;
2705 struct net_device *dev;
2706 int err = -EINVAL;
2707
2708 rtnl_lock();
2709
2710 err = -EFAULT;
2711 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2712 goto err_exit;
2713
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002714 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715
2716 err = -ENODEV;
Ian Morris63159f22015-03-29 14:00:04 +01002717 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718 goto err_exit;
2719
Amerigo Wang07a93622012-10-29 16:23:10 +00002720#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721 if (dev->type == ARPHRD_SIT) {
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002722 const struct net_device_ops *ops = dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723 struct ifreq ifr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724 struct ip_tunnel_parm p;
2725
2726 err = -EADDRNOTAVAIL;
2727 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2728 goto err_exit;
2729
2730 memset(&p, 0, sizeof(p));
2731 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2732 p.iph.saddr = 0;
2733 p.iph.version = 4;
2734 p.iph.ihl = 5;
2735 p.iph.protocol = IPPROTO_IPV6;
2736 p.iph.ttl = 64;
Stephen Hemmingerd20b3102008-01-21 00:48:43 -08002737 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002738
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002739 if (ops->ndo_do_ioctl) {
2740 mm_segment_t oldfs = get_fs();
2741
2742 set_fs(KERNEL_DS);
2743 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2744 set_fs(oldfs);
2745 } else
2746 err = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002747
2748 if (err == 0) {
2749 err = -ENOBUFS;
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002750 dev = __dev_get_by_name(net, p.name);
2751 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002752 goto err_exit;
2753 err = dev_open(dev);
2754 }
2755 }
Joerg Roedel0be669b2006-10-10 14:49:53 -07002756#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757
2758err_exit:
2759 rtnl_unlock();
2760 return err;
2761}
2762
Madhu Challa93a714d2015-02-25 09:58:35 -08002763static int ipv6_mc_config(struct sock *sk, bool join,
2764 const struct in6_addr *addr, int ifindex)
2765{
2766 int ret;
2767
2768 ASSERT_RTNL();
2769
2770 lock_sock(sk);
2771 if (join)
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002772 ret = ipv6_sock_mc_join(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002773 else
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002774 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002775 release_sock(sk);
2776
2777 return ret;
2778}
2779
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780/*
2781 * Manual configuration of address on an interface
2782 */
Jiri Pirko479840f2013-12-06 09:45:21 +01002783static int inet6_addr_add(struct net *net, int ifindex,
2784 const struct in6_addr *pfx,
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002785 const struct in6_addr *peer_pfx,
Jiri Pirko479840f2013-12-06 09:45:21 +01002786 unsigned int plen, __u32 ifa_flags,
2787 __u32 prefered_lft, __u32 valid_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788{
2789 struct inet6_ifaddr *ifp;
2790 struct inet6_dev *idev;
2791 struct net_device *dev;
Madhu Challa93a714d2015-02-25 09:58:35 -08002792 unsigned long timeout;
2793 clock_t expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002794 int scope;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002795 u32 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002796
2797 ASSERT_RTNL();
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002798
Thomas Graf24ef0da2008-05-28 16:54:22 +02002799 if (plen > 128)
2800 return -EINVAL;
2801
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002802 /* check the lifetime */
2803 if (!valid_lft || prefered_lft > valid_lft)
2804 return -EINVAL;
2805
Jiri Pirko53bd6742013-12-06 09:45:22 +01002806 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2807 return -EINVAL;
2808
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002809 dev = __dev_get_by_index(net, ifindex);
2810 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811 return -ENODEV;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002812
Brian Haley64e724f2010-07-20 10:34:30 +00002813 idev = addrconf_add_dev(dev);
2814 if (IS_ERR(idev))
2815 return PTR_ERR(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002816
Madhu Challa93a714d2015-02-25 09:58:35 -08002817 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2818 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2819 true, pfx, ifindex);
2820
2821 if (ret < 0)
2822 return ret;
2823 }
2824
Linus Torvalds1da177e2005-04-16 15:20:36 -07002825 scope = ipv6_addr_scope(pfx);
2826
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002827 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2828 if (addrconf_finite_timeout(timeout)) {
2829 expires = jiffies_to_clock_t(timeout * HZ);
2830 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002831 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002832 } else {
2833 expires = 0;
2834 flags = 0;
2835 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002836 }
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002837
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002838 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2839 if (addrconf_finite_timeout(timeout)) {
2840 if (timeout == 0)
2841 ifa_flags |= IFA_F_DEPRECATED;
2842 prefered_lft = timeout;
2843 }
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002844
Jiri Benc8a226b22013-08-01 10:41:28 +02002845 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2846 valid_lft, prefered_lft);
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002847
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848 if (!IS_ERR(ifp)) {
Thomas Haller761aac72014-01-15 15:36:58 +01002849 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2850 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2851 expires, flags);
2852 }
2853
Neil Horman95c385b2007-04-25 17:08:10 -07002854 /*
2855 * Note that section 3.1 of RFC 4429 indicates
2856 * that the Optimistic flag should not be set for
2857 * manually configured addresses
2858 */
David S. Millercf22f9a2012-04-14 21:37:40 -04002859 addrconf_dad_start(ifp);
Jiri Pirko53bd6742013-12-06 09:45:22 +01002860 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2861 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2862 true, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002864 addrconf_verify_rtnl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865 return 0;
Madhu Challa93a714d2015-02-25 09:58:35 -08002866 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2867 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2868 false, pfx, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869 }
2870
2871 return PTR_ERR(ifp);
2872}
2873
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002874static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2875 const struct in6_addr *pfx, unsigned int plen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876{
2877 struct inet6_ifaddr *ifp;
2878 struct inet6_dev *idev;
2879 struct net_device *dev;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002880
Thomas Graf24ef0da2008-05-28 16:54:22 +02002881 if (plen > 128)
2882 return -EINVAL;
2883
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002884 dev = __dev_get_by_index(net, ifindex);
2885 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 return -ENODEV;
2887
Ian Morrise5d08d72014-11-23 21:28:43 +00002888 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01002889 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002890 return -ENXIO;
2891
2892 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00002893 list_for_each_entry(ifp, &idev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894 if (ifp->prefix_len == plen &&
2895 ipv6_addr_equal(pfx, &ifp->addr)) {
2896 in6_ifa_hold(ifp);
2897 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002898
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002899 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2900 (ifa_flags & IFA_F_MANAGETEMPADDR))
2901 manage_tempaddrs(idev, ifp, 0, 0, false,
2902 jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903 ipv6_del_addr(ifp);
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002904 addrconf_verify_rtnl();
Madhu Challa93a714d2015-02-25 09:58:35 -08002905 if (ipv6_addr_is_multicast(pfx)) {
2906 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2907 false, pfx, dev->ifindex);
2908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909 return 0;
2910 }
2911 }
2912 read_unlock_bh(&idev->lock);
2913 return -EADDRNOTAVAIL;
2914}
2915
2916
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002917int addrconf_add_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918{
2919 struct in6_ifreq ireq;
2920 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002921
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002922 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 return -EPERM;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002924
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2926 return -EFAULT;
2927
2928 rtnl_lock();
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002929 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002930 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2931 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002932 rtnl_unlock();
2933 return err;
2934}
2935
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002936int addrconf_del_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937{
2938 struct in6_ifreq ireq;
2939 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002940
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002941 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 return -EPERM;
2943
2944 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2945 return -EFAULT;
2946
2947 rtnl_lock();
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002948 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002949 ireq.ifr6_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002950 rtnl_unlock();
2951 return err;
2952}
2953
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002954static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2955 int plen, int scope)
2956{
2957 struct inet6_ifaddr *ifp;
2958
Jiri Benc8a226b22013-08-01 10:41:28 +02002959 ifp = ipv6_add_addr(idev, addr, NULL, plen,
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01002960 scope, IFA_F_PERMANENT,
2961 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002962 if (!IS_ERR(ifp)) {
2963 spin_lock_bh(&ifp->lock);
2964 ifp->flags &= ~IFA_F_TENTATIVE;
2965 spin_unlock_bh(&ifp->lock);
Paolo Abeni764d3be2016-11-22 16:57:40 +01002966 rt_genid_bump_ipv6(dev_net(idev->dev));
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002967 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2968 in6_ifa_put(ifp);
2969 }
2970}
2971
Amerigo Wang07a93622012-10-29 16:23:10 +00002972#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973static void sit_add_v4_addrs(struct inet6_dev *idev)
2974{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002975 struct in6_addr addr;
2976 struct net_device *dev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002977 struct net *net = dev_net(idev->dev);
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002978 int scope, plen;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002979 u32 pflags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980
2981 ASSERT_RTNL();
2982
2983 memset(&addr, 0, sizeof(struct in6_addr));
2984 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2985
2986 if (idev->dev->flags&IFF_POINTOPOINT) {
2987 addr.s6_addr32[0] = htonl(0xfe800000);
2988 scope = IFA_LINK;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002989 plen = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002990 } else {
2991 scope = IPV6_ADDR_COMPATv4;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002992 plen = 96;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002993 pflags |= RTF_NONEXTHOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994 }
2995
2996 if (addr.s6_addr32[3]) {
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002997 add_addr(idev, &addr, plen, scope);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002998 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999 return;
3000 }
3001
Benjamin Thery6fda7352008-03-05 10:47:47 -08003002 for_each_netdev(net, dev) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003003 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004 if (in_dev && (dev->flags & IFF_UP)) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003005 struct in_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003006
3007 int flag = scope;
3008
3009 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003010
3011 addr.s6_addr32[3] = ifa->ifa_local;
3012
3013 if (ifa->ifa_scope == RT_SCOPE_LINK)
3014 continue;
3015 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3016 if (idev->dev->flags&IFF_POINTOPOINT)
3017 continue;
3018 flag |= IFA_HOST;
3019 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08003021 add_addr(idev, &addr, plen, flag);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01003022 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3023 pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024 }
3025 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003026 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027}
Joerg Roedel0be669b2006-10-10 14:49:53 -07003028#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029
3030static void init_loopback(struct net_device *dev)
3031{
3032 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003033
3034 /* ::1 */
3035
3036 ASSERT_RTNL();
3037
Ian Morrise5d08d72014-11-23 21:28:43 +00003038 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003039 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003040 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003041 return;
3042 }
3043
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08003044 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045}
3046
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003047void addrconf_add_linklocal(struct inet6_dev *idev,
3048 const struct in6_addr *addr, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003050 struct inet6_ifaddr *ifp;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003051 u32 addr_flags = flags | IFA_F_PERMANENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052
Neil Horman95c385b2007-04-25 17:08:10 -07003053#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3054 if (idev->cnf.optimistic_dad &&
David Miller702beb82008-07-20 18:17:02 -07003055 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
Neil Horman95c385b2007-04-25 17:08:10 -07003056 addr_flags |= IFA_F_OPTIMISTIC;
3057#endif
3058
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01003059 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3060 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061 if (!IS_ERR(ifp)) {
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09003062 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
David S. Millercf22f9a2012-04-14 21:37:40 -04003063 addrconf_dad_start(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003064 in6_ifa_put(ifp);
3065 }
3066}
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003067EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003069static bool ipv6_reserved_interfaceid(struct in6_addr address)
3070{
3071 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3072 return true;
3073
3074 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3075 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3076 return true;
3077
3078 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3079 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3080 return true;
3081
3082 return false;
3083}
3084
3085static int ipv6_generate_stable_address(struct in6_addr *address,
3086 u8 dad_count,
3087 const struct inet6_dev *idev)
3088{
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003089 static DEFINE_SPINLOCK(lock);
3090 static __u32 digest[SHA_DIGEST_WORDS];
3091 static __u32 workspace[SHA_WORKSPACE_WORDS];
3092
3093 static union {
3094 char __data[SHA_MESSAGE_BYTES];
3095 struct {
3096 struct in6_addr secret;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003097 __be32 prefix[2];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003098 unsigned char hwaddr[MAX_ADDR_LEN];
3099 u8 dad_count;
3100 } __packed;
3101 } data;
3102
3103 struct in6_addr secret;
3104 struct in6_addr temp;
3105 struct net *net = dev_net(idev->dev);
3106
3107 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3108
3109 if (idev->cnf.stable_secret.initialized)
3110 secret = idev->cnf.stable_secret.secret;
3111 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3112 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3113 else
3114 return -1;
3115
3116retry:
3117 spin_lock_bh(&lock);
3118
3119 sha_init(digest);
3120 memset(&data, 0, sizeof(data));
3121 memset(workspace, 0, sizeof(workspace));
3122 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003123 data.prefix[0] = address->s6_addr32[0];
3124 data.prefix[1] = address->s6_addr32[1];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003125 data.secret = secret;
3126 data.dad_count = dad_count;
3127
3128 sha_transform(digest, data.__data, workspace);
3129
3130 temp = *address;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003131 temp.s6_addr32[2] = (__force __be32)digest[0];
3132 temp.s6_addr32[3] = (__force __be32)digest[1];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003133
3134 spin_unlock_bh(&lock);
3135
3136 if (ipv6_reserved_interfaceid(temp)) {
3137 dad_count++;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01003138 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003139 return -1;
3140 goto retry;
3141 }
3142
3143 *address = temp;
3144 return 0;
3145}
3146
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003147static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3148{
3149 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3150
3151 if (s->initialized)
3152 return;
3153 s = &idev->cnf.stable_secret;
3154 get_random_bytes(&s->secret, sizeof(s->secret));
3155 s->initialized = true;
3156}
3157
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003158static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3159{
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003160 struct in6_addr addr;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003161
David Ahernca254492015-10-12 11:47:10 -07003162 /* no link local addresses on L3 master devices */
3163 if (netif_is_l3_master(idev->dev))
3164 return;
3165
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003166 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3167
Felix Jiad35a00b2017-01-26 16:59:17 +13003168 switch (idev->cnf.addr_gen_mode) {
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003169 case IN6_ADDR_GEN_MODE_RANDOM:
3170 ipv6_gen_mode_random_init(idev);
3171 /* fallthrough */
3172 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003173 if (!ipv6_generate_stable_address(&addr, 0, idev))
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003174 addrconf_add_linklocal(idev, &addr,
3175 IFA_F_STABLE_PRIVACY);
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003176 else if (prefix_route)
3177 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003178 break;
3179 case IN6_ADDR_GEN_MODE_EUI64:
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003180 /* addrconf_add_linklocal also adds a prefix_route and we
3181 * only need to care about prefix routes if ipv6_generate_eui64
3182 * couldn't generate one.
3183 */
3184 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003185 addrconf_add_linklocal(idev, &addr, 0);
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003186 else if (prefix_route)
3187 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003188 break;
3189 case IN6_ADDR_GEN_MODE_NONE:
3190 default:
3191 /* will not add any link local address */
3192 break;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003193 }
3194}
3195
Linus Torvalds1da177e2005-04-16 15:20:36 -07003196static void addrconf_dev_config(struct net_device *dev)
3197{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003198 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003199
3200 ASSERT_RTNL();
3201
Herbert Xu74235a22007-06-14 13:02:55 -07003202 if ((dev->type != ARPHRD_ETHER) &&
3203 (dev->type != ARPHRD_FDDI) &&
Herbert Xu74235a22007-06-14 13:02:55 -07003204 (dev->type != ARPHRD_ARCNET) &&
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00003205 (dev->type != ARPHRD_INFINIBAND) &&
Nicolas Dichtele8377352013-08-20 12:16:06 +02003206 (dev->type != ARPHRD_IEEE1394) &&
Jukka Rissanene74bccb82013-12-11 17:05:36 +02003207 (dev->type != ARPHRD_TUNNEL6) &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003208 (dev->type != ARPHRD_6LOWPAN) &&
Felix Jia45ce0fd2017-01-26 16:59:18 +13003209 (dev->type != ARPHRD_IP6GRE) &&
3210 (dev->type != ARPHRD_IPGRE) &&
3211 (dev->type != ARPHRD_TUNNEL) &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003212 (dev->type != ARPHRD_NONE)) {
Herbert Xu74235a22007-06-14 13:02:55 -07003213 /* Alas, we support only Ethernet autoconfiguration. */
3214 return;
3215 }
3216
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217 idev = addrconf_add_dev(dev);
Brian Haley64e724f2010-07-20 10:34:30 +00003218 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003219 return;
3220
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003221 /* this device type has no EUI support */
3222 if (dev->type == ARPHRD_NONE &&
Felix Jiad35a00b2017-01-26 16:59:17 +13003223 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3224 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003225
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003226 addrconf_addr_gen(idev, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227}
3228
Amerigo Wang07a93622012-10-29 16:23:10 +00003229#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230static void addrconf_sit_config(struct net_device *dev)
3231{
3232 struct inet6_dev *idev;
3233
3234 ASSERT_RTNL();
3235
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003236 /*
3237 * Configure the tunnel with one of our IPv4
3238 * addresses... we should configure all of
Linus Torvalds1da177e2005-04-16 15:20:36 -07003239 * our v4 addrs in the tunnel
3240 */
3241
Ian Morrise5d08d72014-11-23 21:28:43 +00003242 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003243 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003244 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245 return;
3246 }
3247
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003248 if (dev->priv_flags & IFF_ISATAP) {
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003249 addrconf_addr_gen(idev, false);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003250 return;
3251 }
3252
Linus Torvalds1da177e2005-04-16 15:20:36 -07003253 sit_add_v4_addrs(idev);
3254
Nicolas Dichtel62b54dd2012-10-01 23:19:14 +00003255 if (dev->flags&IFF_POINTOPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003256 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003257}
Joerg Roedel0be669b2006-10-10 14:49:53 -07003258#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003259
Amerigo Wang07a93622012-10-29 16:23:10 +00003260#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003261static void addrconf_gre_config(struct net_device *dev)
3262{
3263 struct inet6_dev *idev;
stephen hemmingeraee80b52011-06-08 10:44:30 +00003264
stephen hemmingeraee80b52011-06-08 10:44:30 +00003265 ASSERT_RTNL();
3266
Ian Morrise5d08d72014-11-23 21:28:43 +00003267 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003268 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003269 pr_debug("%s: add_dev failed\n", __func__);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003270 return;
3271 }
3272
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003273 addrconf_addr_gen(idev, true);
Hannes Frederic Sowad9e4ce62015-10-08 18:19:39 +02003274 if (dev->flags & IFF_POINTOPOINT)
3275 addrconf_add_mroute(dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003276}
3277#endif
3278
David Ahernf1705ec2016-02-24 09:25:37 -08003279static int fixup_permanent_addr(struct inet6_dev *idev,
3280 struct inet6_ifaddr *ifp)
3281{
Ido Schimmelfc882fc2017-08-03 13:28:24 +02003282 /* !rt6i_node means the host route was removed from the
David Ahern8048ced2017-04-25 09:17:29 -07003283 * FIB, for example, if 'lo' device is taken down. In that
3284 * case regenerate the host route.
3285 */
Ido Schimmelfc882fc2017-08-03 13:28:24 +02003286 if (!ifp->rt || !ifp->rt->rt6i_node) {
David Ahern8048ced2017-04-25 09:17:29 -07003287 struct rt6_info *rt, *prev;
David Ahernf1705ec2016-02-24 09:25:37 -08003288
3289 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3290 if (unlikely(IS_ERR(rt)))
3291 return PTR_ERR(rt);
3292
David Ahern8048ced2017-04-25 09:17:29 -07003293 /* ifp->rt can be accessed outside of rtnl */
3294 spin_lock(&ifp->lock);
3295 prev = ifp->rt;
David Ahernf1705ec2016-02-24 09:25:37 -08003296 ifp->rt = rt;
David Ahern8048ced2017-04-25 09:17:29 -07003297 spin_unlock(&ifp->lock);
3298
3299 ip6_rt_put(prev);
David Ahernf1705ec2016-02-24 09:25:37 -08003300 }
3301
3302 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3303 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3304 idev->dev, 0, 0);
3305 }
3306
David Ahern6d717132017-05-02 14:43:44 -07003307 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3308 addrconf_dad_start(ifp);
David Ahernf1705ec2016-02-24 09:25:37 -08003309
3310 return 0;
3311}
3312
3313static void addrconf_permanent_addr(struct net_device *dev)
3314{
3315 struct inet6_ifaddr *ifp, *tmp;
3316 struct inet6_dev *idev;
3317
3318 idev = __in6_dev_get(dev);
3319 if (!idev)
3320 return;
3321
3322 write_lock_bh(&idev->lock);
3323
3324 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3325 if ((ifp->flags & IFA_F_PERMANENT) &&
3326 fixup_permanent_addr(idev, ifp) < 0) {
3327 write_unlock_bh(&idev->lock);
3328 ipv6_del_addr(ifp);
3329 write_lock_bh(&idev->lock);
3330
3331 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3332 idev->dev->name, &ifp->addr);
3333 }
3334 }
3335
3336 write_unlock_bh(&idev->lock);
3337}
3338
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003339static int addrconf_notify(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +00003340 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003341{
Jiri Pirko351638e2013-05-28 01:30:21 +00003342 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
David Ahern4f7f34e2016-04-07 11:10:41 -07003343 struct netdev_notifier_changeupper_info *info;
Eric Dumazet748e2d92012-08-22 21:50:59 +00003344 struct inet6_dev *idev = __in6_dev_get(dev);
WANG Cong60abc0b2017-06-21 14:34:58 -07003345 struct net *net = dev_net(dev);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003346 int run_pending = 0;
Herbert Xub217d612007-07-30 17:04:52 -07003347 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003348
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003349 switch (event) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003350 case NETDEV_REGISTER:
Herbert Xu74235a22007-06-14 13:02:55 -07003351 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003352 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -07003353 if (IS_ERR(idev))
3354 return notifier_from_errno(PTR_ERR(idev));
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003355 }
3356 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003357
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003358 case NETDEV_CHANGEMTU:
3359 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3360 if (dev->mtu < IPV6_MIN_MTU) {
WANG Cong60abc0b2017-06-21 14:34:58 -07003361 addrconf_ifdown(dev, dev != net->loopback_dev);
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003362 break;
3363 }
3364
3365 if (idev) {
3366 rt6_mtu_change(dev, dev->mtu);
3367 idev->cnf.mtu6 = dev->mtu;
3368 break;
3369 }
3370
3371 /* allocate new idev */
3372 idev = ipv6_add_dev(dev);
3373 if (IS_ERR(idev))
3374 break;
3375
3376 /* device is still not ready */
3377 if (!(idev->if_flags & IF_READY))
3378 break;
3379
3380 run_pending = 1;
3381
3382 /* fall through */
3383
Linus Torvalds1da177e2005-04-16 15:20:36 -07003384 case NETDEV_UP:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003385 case NETDEV_CHANGE:
Jay Vosburghc2edacf2007-07-09 10:42:47 -07003386 if (dev->flags & IFF_SLAVE)
3387 break;
3388
WANG Cong3ce62a82014-09-11 15:07:16 -07003389 if (idev && idev->cnf.disable_ipv6)
3390 break;
3391
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003392 if (event == NETDEV_UP) {
David Ahern38bd10c2016-04-21 20:56:12 -07003393 /* restore routes for permanent addresses */
3394 addrconf_permanent_addr(dev);
3395
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -07003396 if (!addrconf_qdisc_ok(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003397 /* device is not ready yet. */
Joe Perchesf3213832012-05-15 14:11:53 +00003398 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003399 dev->name);
3400 break;
3401 }
Kristian Slavov99081042006-02-08 16:10:53 -08003402
Evgeniy Polyakovd31c7b82007-11-30 23:36:08 +11003403 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3404 idev = ipv6_add_dev(dev);
3405
WANG Conga317a2f2014-07-25 15:25:09 -07003406 if (!IS_ERR_OR_NULL(idev)) {
Kristian Slavov99081042006-02-08 16:10:53 -08003407 idev->if_flags |= IF_READY;
Benjamin Therye3ec6cf2008-11-05 01:43:57 -08003408 run_pending = 1;
3409 }
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003410 } else if (event == NETDEV_CHANGE) {
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -07003411 if (!addrconf_qdisc_ok(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003412 /* device is still not ready. */
3413 break;
3414 }
3415
3416 if (idev) {
Linus Lüssinga088d1d2017-02-03 08:11:03 +01003417 if (idev->if_flags & IF_READY) {
3418 /* device is already configured -
3419 * but resend MLD reports, we might
3420 * have roamed and need to update
3421 * multicast snooping switches
3422 */
3423 ipv6_mc_up(idev);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003424 break;
Linus Lüssinga088d1d2017-02-03 08:11:03 +01003425 }
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003426 idev->if_flags |= IF_READY;
3427 }
3428
Joe Perchesf3213832012-05-15 14:11:53 +00003429 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3430 dev->name);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003431
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003432 run_pending = 1;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003433 }
3434
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003435 switch (dev->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +00003436#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003437 case ARPHRD_SIT:
3438 addrconf_sit_config(dev);
3439 break;
Joerg Roedel0be669b2006-10-10 14:49:53 -07003440#endif
Amerigo Wang07a93622012-10-29 16:23:10 +00003441#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003442 case ARPHRD_IPGRE:
3443 addrconf_gre_config(dev);
3444 break;
3445#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003446 case ARPHRD_LOOPBACK:
3447 init_loopback(dev);
3448 break;
3449
3450 default:
3451 addrconf_dev_config(dev);
3452 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003453 }
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003454
WANG Conga317a2f2014-07-25 15:25:09 -07003455 if (!IS_ERR_OR_NULL(idev)) {
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003456 if (run_pending)
3457 addrconf_dad_run(idev);
3458
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003459 /*
3460 * If the MTU changed during the interface down,
3461 * when the interface up, the changed MTU must be
3462 * reflected in the idev as well as routers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003463 */
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003464 if (idev->cnf.mtu6 != dev->mtu &&
3465 dev->mtu >= IPV6_MIN_MTU) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003466 rt6_mtu_change(dev, dev->mtu);
3467 idev->cnf.mtu6 = dev->mtu;
3468 }
3469 idev->tstamp = jiffies;
3470 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003471
3472 /*
3473 * If the changed mtu during down is lower than
3474 * IPV6_MIN_MTU stop IPv6 on this interface.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475 */
3476 if (dev->mtu < IPV6_MIN_MTU)
WANG Cong60abc0b2017-06-21 14:34:58 -07003477 addrconf_ifdown(dev, dev != net->loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003478 }
3479 break;
3480
Linus Torvalds1da177e2005-04-16 15:20:36 -07003481 case NETDEV_DOWN:
3482 case NETDEV_UNREGISTER:
3483 /*
3484 * Remove all addresses from this interface.
3485 */
3486 addrconf_ifdown(dev, event != NETDEV_DOWN);
3487 break;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003488
Linus Torvalds1da177e2005-04-16 15:20:36 -07003489 case NETDEV_CHANGENAME:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003490 if (idev) {
Stephen Hemminger5632c512007-04-28 21:16:39 -07003491 snmp6_unregister_dev(idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003492 addrconf_sysctl_unregister(idev);
WANG Conga317a2f2014-07-25 15:25:09 -07003493 err = addrconf_sysctl_register(idev);
Herbert Xub217d612007-07-30 17:04:52 -07003494 if (err)
3495 return notifier_from_errno(err);
WANG Conga317a2f2014-07-25 15:25:09 -07003496 err = snmp6_register_dev(idev);
3497 if (err) {
3498 addrconf_sysctl_unregister(idev);
3499 return notifier_from_errno(err);
3500 }
Stephen Hemminger5632c512007-04-28 21:16:39 -07003501 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003503
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003504 case NETDEV_PRE_TYPE_CHANGE:
3505 case NETDEV_POST_TYPE_CHANGE:
Andrew Lunn3ef09522015-12-03 21:12:32 +01003506 if (idev)
3507 addrconf_type_change(dev, event);
Moni Shoua75c78502009-09-15 02:37:40 -07003508 break;
David Ahern4f7f34e2016-04-07 11:10:41 -07003509
3510 case NETDEV_CHANGEUPPER:
3511 info = ptr;
3512
3513 /* flush all routes if dev is linked to or unlinked from
3514 * an L3 master device (e.g., VRF)
3515 */
3516 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3517 addrconf_ifdown(dev, 0);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003518 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003519
3520 return NOTIFY_OK;
3521}
3522
3523/*
3524 * addrconf module should be notified of a device going up
3525 */
3526static struct notifier_block ipv6_dev_notf = {
3527 .notifier_call = addrconf_notify,
WANG Cong242d3a42017-05-08 10:12:13 -07003528 .priority = ADDRCONF_NOTIFY_PRIORITY,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003529};
3530
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003531static void addrconf_type_change(struct net_device *dev, unsigned long event)
Moni Shoua75c78502009-09-15 02:37:40 -07003532{
3533 struct inet6_dev *idev;
3534 ASSERT_RTNL();
3535
3536 idev = __in6_dev_get(dev);
3537
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003538 if (event == NETDEV_POST_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003539 ipv6_mc_remap(idev);
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003540 else if (event == NETDEV_PRE_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003541 ipv6_mc_unmap(idev);
3542}
3543
David Ahern70af9212016-04-08 12:01:21 -07003544static bool addr_is_local(const struct in6_addr *addr)
3545{
3546 return ipv6_addr_type(addr) &
3547 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3548}
3549
Linus Torvalds1da177e2005-04-16 15:20:36 -07003550static int addrconf_ifdown(struct net_device *dev, int how)
3551{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09003552 struct net *net = dev_net(dev);
stephen hemminger502a2ff2010-03-17 20:31:13 +00003553 struct inet6_dev *idev;
David Ahernf1705ec2016-02-24 09:25:37 -08003554 struct inet6_ifaddr *ifa, *tmp;
3555 struct list_head del_list;
3556 int _keep_addr;
3557 bool keep_addr;
David S. Miller73a8bd72011-01-23 23:27:15 -08003558 int state, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003559
3560 ASSERT_RTNL();
3561
David S. Miller73a8bd72011-01-23 23:27:15 -08003562 rt6_ifdown(net, dev);
3563 neigh_ifdown(&nd_tbl, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003564
3565 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003566 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003567 return -ENODEV;
3568
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003569 /*
3570 * Step 1: remove reference to ipv6 device from parent device.
3571 * Do not dev_put!
Linus Torvalds1da177e2005-04-16 15:20:36 -07003572 */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003573 if (how) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003574 idev->dead = 1;
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07003575
3576 /* protected by rtnl_lock */
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003577 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003578
3579 /* Step 1.5: remove snmp6 entry */
3580 snmp6_unregister_dev(idev);
3581
3582 }
3583
David Ahernf1705ec2016-02-24 09:25:37 -08003584 /* aggregate the system setting and interface setting */
3585 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3586 if (!_keep_addr)
3587 _keep_addr = idev->cnf.keep_addr_on_down;
3588
3589 /* combine the user config with event to determine if permanent
3590 * addresses are to be removed from address hash table
3591 */
Mike Manningbc561632016-08-12 12:02:38 +01003592 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003593
David S. Miller73a8bd72011-01-23 23:27:15 -08003594 /* Step 2: clear hash table */
3595 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3596 struct hlist_head *h = &inet6_addr_lst[i];
David S. Miller73a8bd72011-01-23 23:27:15 -08003597
3598 spin_lock_bh(&addrconf_hash_lock);
Ian Morris67ba4152014-08-24 21:53:10 +01003599restart:
Sasha Levinb67bfe02013-02-27 17:06:00 -08003600 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
David S. Miller73a8bd72011-01-23 23:27:15 -08003601 if (ifa->idev == idev) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003602 addrconf_del_dad_work(ifa);
David Ahernf1705ec2016-02-24 09:25:37 -08003603 /* combined flag + permanent flag decide if
3604 * address is retained on a down event
3605 */
3606 if (!keep_addr ||
David Ahern70af9212016-04-08 12:01:21 -07003607 !(ifa->flags & IFA_F_PERMANENT) ||
3608 addr_is_local(&ifa->addr)) {
David Ahernf1705ec2016-02-24 09:25:37 -08003609 hlist_del_init_rcu(&ifa->addr_lst);
3610 goto restart;
3611 }
David S. Miller73a8bd72011-01-23 23:27:15 -08003612 }
3613 }
3614 spin_unlock_bh(&addrconf_hash_lock);
3615 }
3616
Linus Torvalds1da177e2005-04-16 15:20:36 -07003617 write_lock_bh(&idev->lock);
3618
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003619 addrconf_del_rs_timer(idev);
3620
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003621 /* Step 2: clear flags for stateless addrconf */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003622 if (!how)
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003623 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003624
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003625 /* Step 3: clear tempaddr list */
stephen hemminger372e6c82010-03-17 20:31:09 +00003626 while (!list_empty(&idev->tempaddr_list)) {
3627 ifa = list_first_entry(&idev->tempaddr_list,
3628 struct inet6_ifaddr, tmp_list);
3629 list_del(&ifa->tmp_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003630 write_unlock_bh(&idev->lock);
3631 spin_lock_bh(&ifa->lock);
3632
3633 if (ifa->ifpub) {
3634 in6_ifa_put(ifa->ifpub);
3635 ifa->ifpub = NULL;
3636 }
3637 spin_unlock_bh(&ifa->lock);
3638 in6_ifa_put(ifa);
3639 write_lock_bh(&idev->lock);
3640 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003641
David Ahernf1705ec2016-02-24 09:25:37 -08003642 /* re-combine the user config with event to determine if permanent
3643 * addresses are to be removed from the interface list
3644 */
Mike Manningbc561632016-08-12 12:02:38 +01003645 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003646
3647 INIT_LIST_HEAD(&del_list);
3648 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
David Ahern38bd10c2016-04-21 20:56:12 -07003649 struct rt6_info *rt = NULL;
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003650 bool keep;
David Ahern38bd10c2016-04-21 20:56:12 -07003651
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003652 addrconf_del_dad_work(ifa);
stephen hemminger84e8b802010-03-02 13:32:46 +00003653
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003654 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3655 !addr_is_local(&ifa->addr);
3656 if (!keep)
3657 list_move(&ifa->if_list, &del_list);
3658
David S. Miller73a8bd72011-01-23 23:27:15 -08003659 write_unlock_bh(&idev->lock);
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003660 spin_lock_bh(&ifa->lock);
David Ahernf1705ec2016-02-24 09:25:37 -08003661
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003662 if (keep) {
David Ahernf1705ec2016-02-24 09:25:37 -08003663 /* set state to skip the notifier below */
3664 state = INET6_IFADDR_STATE_DEAD;
David Ahern6d717132017-05-02 14:43:44 -07003665 ifa->state = INET6_IFADDR_STATE_PREDAD;
David Ahernf1705ec2016-02-24 09:25:37 -08003666 if (!(ifa->flags & IFA_F_NODAD))
3667 ifa->flags |= IFA_F_TENTATIVE;
David Ahern38bd10c2016-04-21 20:56:12 -07003668
3669 rt = ifa->rt;
3670 ifa->rt = NULL;
David Ahernf1705ec2016-02-24 09:25:37 -08003671 } else {
3672 state = ifa->state;
3673 ifa->state = INET6_IFADDR_STATE_DEAD;
David Ahernf1705ec2016-02-24 09:25:37 -08003674 }
3675
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003676 spin_unlock_bh(&ifa->lock);
stephen hemminger84e8b802010-03-02 13:32:46 +00003677
David Ahern38bd10c2016-04-21 20:56:12 -07003678 if (rt)
3679 ip6_del_rt(rt);
3680
David S. Miller73a8bd72011-01-23 23:27:15 -08003681 if (state != INET6_IFADDR_STATE_DEAD) {
3682 __ipv6_ifa_notify(RTM_DELADDR, ifa);
Cong Wangf88c91d2013-04-14 23:18:43 +08003683 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
Mike Manningea06f712016-07-22 18:32:11 +01003684 } else {
3685 if (idev->cnf.forwarding)
3686 addrconf_leave_anycast(ifa);
3687 addrconf_leave_solict(ifa->idev, &ifa->addr);
stephen hemminger27bdb2a2010-04-12 05:41:32 +00003688 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003689
David S. Miller73a8bd72011-01-23 23:27:15 -08003690 write_lock_bh(&idev->lock);
3691 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003692
Linus Torvalds1da177e2005-04-16 15:20:36 -07003693 write_unlock_bh(&idev->lock);
3694
David Ahernf1705ec2016-02-24 09:25:37 -08003695 /* now clean up addresses to be removed */
3696 while (!list_empty(&del_list)) {
3697 ifa = list_first_entry(&del_list,
3698 struct inet6_ifaddr, if_list);
3699 list_del(&ifa->if_list);
3700
3701 in6_ifa_put(ifa);
3702 }
3703
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003704 /* Step 5: Discard anycast and multicast list */
3705 if (how) {
3706 ipv6_ac_destroy_dev(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003707 ipv6_mc_destroy_dev(idev);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003708 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003709 ipv6_mc_down(idev);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003710 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003711
Linus Torvalds1da177e2005-04-16 15:20:36 -07003712 idev->tstamp = jiffies;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003713
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003714 /* Last: Shot the device (if unregistered) */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003715 if (how) {
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003716 addrconf_sysctl_unregister(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003717 neigh_parms_release(&nd_tbl, idev->nd_parms);
3718 neigh_ifdown(&nd_tbl, dev);
3719 in6_dev_put(idev);
3720 }
3721 return 0;
3722}
3723
3724static void addrconf_rs_timer(unsigned long data)
3725{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003726 struct inet6_dev *idev = (struct inet6_dev *)data;
Cong Wangcaf92bc2013-08-31 13:44:32 +08003727 struct net_device *dev = idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003728 struct in6_addr lladdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003729
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003730 write_lock(&idev->lock);
stephen hemminger5b2a1952010-03-02 13:32:45 +00003731 if (idev->dead || !(idev->if_flags & IF_READY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003732 goto out;
3733
Shmulik Ladkani9ba2add2012-12-02 01:44:53 +00003734 if (!ipv6_accept_ra(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003735 goto out;
stephen hemminger5b2a1952010-03-02 13:32:45 +00003736
3737 /* Announcement received after solicitation was sent */
3738 if (idev->if_flags & IF_RA_RCVD)
3739 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003740
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003741 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
Cong Wangcaf92bc2013-08-31 13:44:32 +08003742 write_unlock(&idev->lock);
3743 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3744 ndisc_send_rs(dev, &lladdr,
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003745 &in6addr_linklocal_allrouters);
3746 else
Cong Wangcaf92bc2013-08-31 13:44:32 +08003747 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003748
Cong Wangcaf92bc2013-08-31 13:44:32 +08003749 write_lock(&idev->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003750 idev->rs_interval = rfc3315_s14_backoff_update(
3751 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003752 /* The wait after the last probe can be shorter */
3753 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3754 idev->cnf.rtr_solicits) ?
3755 idev->cnf.rtr_solicit_delay :
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003756 idev->rs_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003757 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003758 /*
3759 * Note: we do not support deprecated "all on-link"
3760 * assumption any longer.
3761 */
Joe Perches91df42b2012-05-15 14:11:54 +00003762 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003763 }
3764
3765out:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003766 write_unlock(&idev->lock);
Cong Wangcaf92bc2013-08-31 13:44:32 +08003767put:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003768 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003769}
3770
3771/*
3772 * Duplicate Address Detection
3773 */
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003774static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3775{
3776 unsigned long rand_num;
3777 struct inet6_dev *idev = ifp->idev;
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003778 u64 nonce;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003779
Neil Horman95c385b2007-04-25 17:08:10 -07003780 if (ifp->flags & IFA_F_OPTIMISTIC)
3781 rand_num = 0;
3782 else
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003783 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
Neil Horman95c385b2007-04-25 17:08:10 -07003784
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003785 nonce = 0;
3786 if (idev->cnf.enhanced_dad ||
3787 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3788 do
3789 get_random_bytes(&nonce, 6);
3790 while (nonce == 0);
3791 }
3792 ifp->dad_nonce = nonce;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003793 ifp->dad_probes = idev->cnf.dad_transmits;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003794 addrconf_mod_dad_work(ifp, rand_num);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003795}
3796
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003797static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003798{
3799 struct inet6_dev *idev = ifp->idev;
3800 struct net_device *dev = idev->dev;
Paolo Abeni764d3be2016-11-22 16:57:40 +01003801 bool bump_id, notify = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003802
3803 addrconf_join_solict(dev, &ifp->addr);
3804
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003805 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806
3807 read_lock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003808 spin_lock(&ifp->lock);
Herbert Xue9d3e082010-05-18 15:36:06 -07003809 if (ifp->state == INET6_IFADDR_STATE_DEAD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003810 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003811
3812 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09003813 idev->cnf.accept_dad < 1 ||
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07003814 !(ifp->flags&IFA_F_TENTATIVE) ||
3815 ifp->flags & IFA_F_NODAD) {
Paolo Abeni764d3be2016-11-22 16:57:40 +01003816 bump_id = ifp->flags & IFA_F_TENTATIVE;
Brian Haleycc411d02009-09-09 14:41:32 +00003817 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003818 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003819 read_unlock_bh(&idev->lock);
3820
Paolo Abeni764d3be2016-11-22 16:57:40 +01003821 addrconf_dad_completed(ifp, bump_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003822 return;
3823 }
3824
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003825 if (!(idev->if_flags & IF_READY)) {
stephen hemminger21809fa2010-02-08 19:48:52 +00003826 spin_unlock(&ifp->lock);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003827 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003828 /*
Masatake YAMATO590a9882009-06-09 10:41:12 +09003829 * If the device is not ready:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003830 * - keep it tentative if it is a permanent address.
3831 * - otherwise, kill it.
3832 */
3833 in6_ifa_hold(ifp);
Brian Haleycc411d02009-09-09 14:41:32 +00003834 addrconf_dad_stop(ifp, 0);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003835 return;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003836 }
Neil Horman95c385b2007-04-25 17:08:10 -07003837
3838 /*
3839 * Optimistic nodes can start receiving
3840 * Frames right away
3841 */
Erik Kline7fd25612014-10-28 18:11:14 +09003842 if (ifp->flags & IFA_F_OPTIMISTIC) {
Neil Horman95c385b2007-04-25 17:08:10 -07003843 ip6_ins_rt(ifp->rt);
Erik Kline7fd25612014-10-28 18:11:14 +09003844 if (ipv6_use_optimistic_addr(idev)) {
3845 /* Because optimistic nodes can use this address,
3846 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3847 */
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003848 notify = true;
Erik Kline7fd25612014-10-28 18:11:14 +09003849 }
3850 }
Neil Horman95c385b2007-04-25 17:08:10 -07003851
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003852 addrconf_dad_kick(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003853out:
Herbert Xu622ccdf2010-05-18 15:56:06 -07003854 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 read_unlock_bh(&idev->lock);
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003856 if (notify)
3857 ipv6_ifa_notify(RTM_NEWADDR, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003858}
3859
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003860static void addrconf_dad_start(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003861{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003862 bool begin_dad = false;
3863
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003864 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003865 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3866 ifp->state = INET6_IFADDR_STATE_PREDAD;
3867 begin_dad = true;
3868 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003869 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003870
3871 if (begin_dad)
3872 addrconf_mod_dad_work(ifp, 0);
3873}
3874
3875static void addrconf_dad_work(struct work_struct *w)
3876{
3877 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3878 struct inet6_ifaddr,
3879 dad_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003880 struct inet6_dev *idev = ifp->idev;
Paolo Abeni764d3be2016-11-22 16:57:40 +01003881 bool bump_id, disable_ipv6 = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882 struct in6_addr mcaddr;
3883
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003884 enum {
3885 DAD_PROCESS,
3886 DAD_BEGIN,
3887 DAD_ABORT,
3888 } action = DAD_PROCESS;
3889
3890 rtnl_lock();
3891
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003892 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003893 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3894 action = DAD_BEGIN;
3895 ifp->state = INET6_IFADDR_STATE_DAD;
3896 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3897 action = DAD_ABORT;
3898 ifp->state = INET6_IFADDR_STATE_POSTDAD;
Mike Manning85b51b12016-08-18 14:39:40 +01003899
3900 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3901 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3902 struct in6_addr addr;
3903
3904 addr.s6_addr32[0] = htonl(0xfe800000);
3905 addr.s6_addr32[1] = 0;
3906
3907 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3908 ipv6_addr_equal(&ifp->addr, &addr)) {
3909 /* DAD failed for link-local based on MAC */
3910 idev->cnf.disable_ipv6 = 1;
3911
3912 pr_info("%s: IPv6 being disabled!\n",
3913 ifp->idev->dev->name);
3914 disable_ipv6 = true;
3915 }
3916 }
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003917 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003918 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003919
3920 if (action == DAD_BEGIN) {
3921 addrconf_dad_begin(ifp);
3922 goto out;
3923 } else if (action == DAD_ABORT) {
Wei Yongjun751eb6b2016-09-05 16:06:31 +08003924 in6_ifa_hold(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003925 addrconf_dad_stop(ifp, 1);
Mike Manning85b51b12016-08-18 14:39:40 +01003926 if (disable_ipv6)
3927 addrconf_ifdown(idev->dev, 0);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003928 goto out;
3929 }
3930
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003931 if (!ifp->dad_probes && addrconf_dad_end(ifp))
Herbert Xuf2344a12010-05-18 15:55:27 -07003932 goto out;
3933
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003934 write_lock_bh(&idev->lock);
stephen hemminger122e4512010-03-02 13:32:44 +00003935 if (idev->dead || !(idev->if_flags & IF_READY)) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003936 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003937 goto out;
3938 }
stephen hemminger21809fa2010-02-08 19:48:52 +00003939
3940 spin_lock(&ifp->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003941 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3942 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003943 write_unlock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003944 goto out;
3945 }
3946
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003947 if (ifp->dad_probes == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003948 /*
3949 * DAD was successful
3950 */
3951
Paolo Abeni764d3be2016-11-22 16:57:40 +01003952 bump_id = ifp->flags & IFA_F_TENTATIVE;
Brian Haleycc411d02009-09-09 14:41:32 +00003953 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003954 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003955 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003956
Paolo Abeni764d3be2016-11-22 16:57:40 +01003957 addrconf_dad_completed(ifp, bump_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003958
3959 goto out;
3960 }
3961
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003962 ifp->dad_probes--;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003963 addrconf_mod_dad_work(ifp,
3964 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
stephen hemminger21809fa2010-02-08 19:48:52 +00003965 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003966 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003967
3968 /* send a neighbour solicitation for our addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003969 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003970 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3971 ifp->dad_nonce);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003972out:
3973 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003974 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003975}
3976
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003977/* ifp->idev must be at least read locked */
3978static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3979{
3980 struct inet6_ifaddr *ifpiter;
3981 struct inet6_dev *idev = ifp->idev;
3982
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01003983 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3984 if (ifpiter->scope > IFA_LINK)
3985 break;
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003986 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3987 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3988 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3989 IFA_F_PERMANENT)
3990 return false;
3991 }
3992 return true;
3993}
3994
Paolo Abeni764d3be2016-11-22 16:57:40 +01003995static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003996{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003997 struct net_device *dev = ifp->idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003998 struct in6_addr lladdr;
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003999 bool send_rs, send_mld;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004000
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004001 addrconf_del_dad_work(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004002
4003 /*
4004 * Configure the address for reception. Now it is valid.
4005 */
4006
4007 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4008
Tore Anderson026359b2011-08-28 23:47:33 +00004009 /* If added prefix is link local and we are prepared to process
4010 router advertisements, start sending router solicitations.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004011 */
4012
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004013 read_lock_bh(&ifp->idev->lock);
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01004014 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004015 send_rs = send_mld &&
4016 ipv6_accept_ra(ifp->idev) &&
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004017 ifp->idev->cnf.rtr_solicits != 0 &&
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004018 (dev->flags&IFF_LOOPBACK) == 0;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004019 read_unlock_bh(&ifp->idev->lock);
4020
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004021 /* While dad is in progress mld report's source address is in6_addrany.
4022 * Resend with proper ll now.
4023 */
4024 if (send_mld)
4025 ipv6_mc_dad_complete(ifp->idev);
4026
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004027 if (send_rs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004028 /*
4029 * If a host as already performed a random delay
4030 * [...] as part of DAD [...] there is no need
4031 * to delay again before sending the first RS
4032 */
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004033 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004034 return;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004035 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004036
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004037 write_lock_bh(&ifp->idev->lock);
4038 spin_lock(&ifp->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004039 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4040 ifp->idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004041 ifp->idev->rs_probes = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004042 ifp->idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004043 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004044 spin_unlock(&ifp->lock);
4045 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004046 }
Paolo Abeni764d3be2016-11-22 16:57:40 +01004047
4048 if (bump_id)
4049 rt_genid_bump_ipv6(dev_net(dev));
Marcus Huewea11a7f72017-02-06 18:34:56 +01004050
4051 /* Make sure that a new temporary address will be created
4052 * before this temporary address becomes deprecated.
4053 */
4054 if (ifp->flags & IFA_F_TEMPORARY)
4055 addrconf_verify_rtnl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004056}
4057
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004058static void addrconf_dad_run(struct inet6_dev *idev)
4059{
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004060 struct inet6_ifaddr *ifp;
4061
4062 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00004063 list_for_each_entry(ifp, &idev->addr_list, if_list) {
stephen hemminger21809fa2010-02-08 19:48:52 +00004064 spin_lock(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07004065 if (ifp->flags & IFA_F_TENTATIVE &&
4066 ifp->state == INET6_IFADDR_STATE_DAD)
4067 addrconf_dad_kick(ifp);
stephen hemminger21809fa2010-02-08 19:48:52 +00004068 spin_unlock(&ifp->lock);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004069 }
4070 read_unlock_bh(&idev->lock);
4071}
4072
Linus Torvalds1da177e2005-04-16 15:20:36 -07004073#ifdef CONFIG_PROC_FS
4074struct if6_iter_state {
Daniel Lezcano3c400902008-01-10 22:42:49 -08004075 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004076 int bucket;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004077 int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004078};
4079
Mihai Maruseac1d578302012-01-03 23:31:35 +00004080static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004081{
4082 struct inet6_ifaddr *ifa = NULL;
4083 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004084 struct net *net = seq_file_net(seq);
Mihai Maruseac1d578302012-01-03 23:31:35 +00004085 int p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004086
Mihai Maruseac1d578302012-01-03 23:31:35 +00004087 /* initial bucket if pos is 0 */
4088 if (pos == 0) {
4089 state->bucket = 0;
4090 state->offset = 0;
4091 }
4092
4093 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08004094 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
Mihai Maruseac1d578302012-01-03 23:31:35 +00004095 addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004096 if (!net_eq(dev_net(ifa->idev->dev), net))
4097 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004098 /* sync with offset */
4099 if (p < state->offset) {
4100 p++;
4101 continue;
4102 }
4103 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004104 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004105 }
4106
4107 /* prepare for next bucket */
4108 state->offset = 0;
4109 p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004110 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004111 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004112}
4113
stephen hemmingerc2e21292010-03-17 20:31:10 +00004114static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4115 struct inet6_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004116{
4117 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004118 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004119
Sasha Levinb67bfe02013-02-27 17:06:00 -08004120 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004121 if (!net_eq(dev_net(ifa->idev->dev), net))
4122 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004123 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004124 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004125 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004126
4127 while (++state->bucket < IN6_ADDR_HSIZE) {
Mihai Maruseac1d578302012-01-03 23:31:35 +00004128 state->offset = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -08004129 hlist_for_each_entry_rcu_bh(ifa,
stephen hemmingerc2e21292010-03-17 20:31:10 +00004130 &inet6_addr_lst[state->bucket], addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004131 if (!net_eq(dev_net(ifa->idev->dev), net))
4132 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004133 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004134 return ifa;
Daniel Lezcano3c400902008-01-10 22:42:49 -08004135 }
4136 }
4137
stephen hemmingerc2e21292010-03-17 20:31:10 +00004138 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004139}
4140
Linus Torvalds1da177e2005-04-16 15:20:36 -07004141static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004142 __acquires(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004143{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004144 rcu_read_lock_bh();
Mihai Maruseac1d578302012-01-03 23:31:35 +00004145 return if6_get_first(seq, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004146}
4147
4148static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4149{
4150 struct inet6_ifaddr *ifa;
4151
4152 ifa = if6_get_next(seq, v);
4153 ++*pos;
4154 return ifa;
4155}
4156
4157static void if6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004158 __releases(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004159{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004160 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004161}
4162
4163static int if6_seq_show(struct seq_file *seq, void *v)
4164{
4165 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
Jiri Pirko971a3512013-12-10 13:56:29 +01004166 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
Harvey Harrisonb0711952008-10-28 16:05:40 -07004167 &ifp->addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004168 ifp->idev->dev->ifindex,
4169 ifp->prefix_len,
4170 ifp->scope,
Jiri Pirko971a3512013-12-10 13:56:29 +01004171 (u8) ifp->flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004172 ifp->idev->dev->name);
4173 return 0;
4174}
4175
Philippe De Muyter56b3d972007-07-10 23:07:31 -07004176static const struct seq_operations if6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004177 .start = if6_seq_start,
4178 .next = if6_seq_next,
4179 .show = if6_seq_show,
4180 .stop = if6_seq_stop,
4181};
4182
4183static int if6_seq_open(struct inode *inode, struct file *file)
4184{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004185 return seq_open_net(inode, file, &if6_seq_ops,
4186 sizeof(struct if6_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004187}
4188
Arjan van de Ven9a321442007-02-12 00:55:35 -08004189static const struct file_operations if6_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004190 .owner = THIS_MODULE,
4191 .open = if6_seq_open,
4192 .read = seq_read,
4193 .llseek = seq_lseek,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004194 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004195};
4196
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004197static int __net_init if6_proc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004198{
Gao fengd4beaa62013-02-18 01:34:54 +00004199 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004200 return -ENOMEM;
4201 return 0;
4202}
4203
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004204static void __net_exit if6_proc_net_exit(struct net *net)
Daniel Lezcano3c400902008-01-10 22:42:49 -08004205{
Gao fengece31ff2013-02-18 01:34:56 +00004206 remove_proc_entry("if_inet6", net->proc_net);
Daniel Lezcano3c400902008-01-10 22:42:49 -08004207}
4208
4209static struct pernet_operations if6_proc_net_ops = {
Ian Morris67ba4152014-08-24 21:53:10 +01004210 .init = if6_proc_net_init,
4211 .exit = if6_proc_net_exit,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004212};
4213
4214int __init if6_proc_init(void)
4215{
4216 return register_pernet_subsys(&if6_proc_net_ops);
4217}
4218
Linus Torvalds1da177e2005-04-16 15:20:36 -07004219void if6_proc_exit(void)
4220{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004221 unregister_pernet_subsys(&if6_proc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004222}
4223#endif /* CONFIG_PROC_FS */
4224
Amerigo Wang07a93622012-10-29 16:23:10 +00004225#if IS_ENABLED(CONFIG_IPV6_MIP6)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004226/* Check if address is a home address configured on any interface. */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00004227int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004228{
4229 int ret = 0;
stephen hemmingerc2e21292010-03-17 20:31:10 +00004230 struct inet6_ifaddr *ifp = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00004231 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00004232
stephen hemminger5c578aed2010-03-17 20:31:11 +00004233 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08004234 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09004235 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano389f6612008-01-10 22:44:40 -08004236 continue;
YOSHIFUJI Hideakicaad2952008-04-10 15:42:07 +09004237 if (ipv6_addr_equal(&ifp->addr, addr) &&
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004238 (ifp->flags & IFA_F_HOMEADDRESS)) {
4239 ret = 1;
4240 break;
4241 }
4242 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00004243 rcu_read_unlock_bh();
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004244 return ret;
4245}
4246#endif
4247
Linus Torvalds1da177e2005-04-16 15:20:36 -07004248/*
4249 * Periodic address status verification
4250 */
4251
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004252static void addrconf_verify_rtnl(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004253{
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004254 unsigned long now, next, next_sec, next_sched;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004255 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004256 int i;
4257
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004258 ASSERT_RTNL();
4259
stephen hemminger5c578aed2010-03-17 20:31:11 +00004260 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004261 now = jiffies;
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004262 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004263
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004264 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004265
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07004266 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004267restart:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004268 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004269 unsigned long age;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004270
Yasushi Asanofad8da32013-12-31 12:04:19 +09004271 /* When setting preferred_lft to a value not zero or
4272 * infinity, while valid_lft is infinity
4273 * IFA_F_PERMANENT has a non-infinity life time.
4274 */
4275 if ((ifp->flags & IFA_F_PERMANENT) &&
4276 (ifp->prefered_lft == INFINITY_LIFE_TIME))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004277 continue;
4278
4279 spin_lock(&ifp->lock);
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004280 /* We try to batch several events at once. */
4281 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004282
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004283 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4284 age >= ifp->valid_lft) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004285 spin_unlock(&ifp->lock);
4286 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004287 ipv6_del_addr(ifp);
4288 goto restart;
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004289 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4290 spin_unlock(&ifp->lock);
4291 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004292 } else if (age >= ifp->prefered_lft) {
Brian Haleya1ed0522009-07-02 07:10:52 +00004293 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004294 int deprecate = 0;
4295
4296 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4297 deprecate = 1;
4298 ifp->flags |= IFA_F_DEPRECATED;
4299 }
4300
Yasushi Asanofad8da32013-12-31 12:04:19 +09004301 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4302 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004303 next = ifp->tstamp + ifp->valid_lft * HZ;
4304
4305 spin_unlock(&ifp->lock);
4306
4307 if (deprecate) {
4308 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004309
4310 ipv6_ifa_notify(0, ifp);
4311 in6_ifa_put(ifp);
4312 goto restart;
4313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004314 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4315 !(ifp->flags&IFA_F_TENTATIVE)) {
stephen hemminger88949cf2010-03-17 20:31:17 +00004316 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4317 ifp->idev->cnf.dad_transmits *
Jiri Pirko1f9248e2013-12-07 19:26:53 +01004318 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
stephen hemminger88949cf2010-03-17 20:31:17 +00004319
Linus Torvalds1da177e2005-04-16 15:20:36 -07004320 if (age >= ifp->prefered_lft - regen_advance) {
4321 struct inet6_ifaddr *ifpub = ifp->ifpub;
4322 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4323 next = ifp->tstamp + ifp->prefered_lft * HZ;
4324 if (!ifp->regen_count && ifpub) {
4325 ifp->regen_count++;
4326 in6_ifa_hold(ifp);
4327 in6_ifa_hold(ifpub);
4328 spin_unlock(&ifp->lock);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004329
Hiroyuki YAMAMORI291d8092005-12-23 11:24:05 -08004330 spin_lock(&ifpub->lock);
4331 ifpub->regen_count = 0;
4332 spin_unlock(&ifpub->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004333 ipv6_create_tempaddr(ifpub, ifp);
4334 in6_ifa_put(ifpub);
4335 in6_ifa_put(ifp);
4336 goto restart;
4337 }
4338 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4339 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4340 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004341 } else {
4342 /* ifp->prefered_lft <= ifp->valid_lft */
4343 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4344 next = ifp->tstamp + ifp->prefered_lft * HZ;
4345 spin_unlock(&ifp->lock);
4346 }
4347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004348 }
4349
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004350 next_sec = round_jiffies_up(next);
4351 next_sched = next;
4352
4353 /* If rounded timeout is accurate enough, accept it. */
4354 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4355 next_sched = next_sec;
4356
4357 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4358 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4359 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4360
dingtianhongba3542e2013-08-17 10:27:04 +08004361 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4362 now, next, next_sec, next_sched);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004363 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004364 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004365}
4366
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004367static void addrconf_verify_work(struct work_struct *w)
4368{
4369 rtnl_lock();
4370 addrconf_verify_rtnl();
4371 rtnl_unlock();
4372}
4373
4374static void addrconf_verify(void)
4375{
4376 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4377}
4378
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004379static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4380 struct in6_addr **peer_pfx)
Thomas Graf461d8832006-09-18 00:09:49 -07004381{
4382 struct in6_addr *pfx = NULL;
4383
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004384 *peer_pfx = NULL;
4385
Thomas Graf461d8832006-09-18 00:09:49 -07004386 if (addr)
4387 pfx = nla_data(addr);
4388
4389 if (local) {
4390 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004391 *peer_pfx = pfx;
4392 pfx = nla_data(local);
Thomas Graf461d8832006-09-18 00:09:49 -07004393 }
4394
4395 return pfx;
4396}
4397
Patrick McHardyef7c79e2007-06-05 12:38:30 -07004398static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
Thomas Graf461d8832006-09-18 00:09:49 -07004399 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4400 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4401 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
Jiri Pirko479840f2013-12-06 09:45:21 +01004402 [IFA_FLAGS] = { .len = sizeof(u32) },
Thomas Graf461d8832006-09-18 00:09:49 -07004403};
4404
Linus Torvalds1da177e2005-04-16 15:20:36 -07004405static int
David Ahernc21ef3e2017-04-16 09:48:24 -07004406inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4407 struct netlink_ext_ack *extack)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004408{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004409 struct net *net = sock_net(skb->sk);
Thomas Grafb933f712006-09-18 00:10:19 -07004410 struct ifaddrmsg *ifm;
4411 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004412 struct in6_addr *pfx, *peer_pfx;
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004413 u32 ifa_flags;
Thomas Grafb933f712006-09-18 00:10:19 -07004414 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004415
Johannes Bergfceb6432017-04-12 14:34:07 +02004416 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
David Ahernc21ef3e2017-04-16 09:48:24 -07004417 extack);
Thomas Grafb933f712006-09-18 00:10:19 -07004418 if (err < 0)
4419 return err;
4420
4421 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004422 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004423 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004424 return -EINVAL;
4425
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004426 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4427
4428 /* We ignore other flags so far. */
4429 ifa_flags &= IFA_F_MANAGETEMPADDR;
4430
4431 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4432 ifm->ifa_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004433}
4434
Jiri Pirko479840f2013-12-06 09:45:21 +01004435static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004436 u32 prefered_lft, u32 valid_lft)
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004437{
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004438 u32 flags;
4439 clock_t expires;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004440 unsigned long timeout;
Jiri Pirko53bd6742013-12-06 09:45:22 +01004441 bool was_managetempaddr;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004442 bool had_prefixroute;
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09004443
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004444 ASSERT_RTNL();
4445
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004446 if (!valid_lft || (prefered_lft > valid_lft))
4447 return -EINVAL;
4448
Jiri Pirko53bd6742013-12-06 09:45:22 +01004449 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4450 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4451 return -EINVAL;
4452
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004453 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4454 if (addrconf_finite_timeout(timeout)) {
4455 expires = jiffies_to_clock_t(timeout * HZ);
4456 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004457 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004458 } else {
4459 expires = 0;
4460 flags = 0;
4461 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004462 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004463
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004464 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4465 if (addrconf_finite_timeout(timeout)) {
4466 if (timeout == 0)
4467 ifa_flags |= IFA_F_DEPRECATED;
4468 prefered_lft = timeout;
4469 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004470
4471 spin_lock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004472 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004473 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4474 !(ifp->flags & IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004475 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
Thomas Haller761aac72014-01-15 15:36:58 +01004476 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4477 IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004478 ifp->flags |= ifa_flags;
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004479 ifp->tstamp = jiffies;
4480 ifp->valid_lft = valid_lft;
4481 ifp->prefered_lft = prefered_lft;
4482
4483 spin_unlock_bh(&ifp->lock);
4484 if (!(ifp->flags&IFA_F_TENTATIVE))
4485 ipv6_ifa_notify(0, ifp);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004486
Thomas Haller761aac72014-01-15 15:36:58 +01004487 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4488 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4489 expires, flags);
Thomas Haller5b84efe2014-01-15 15:36:59 +01004490 } else if (had_prefixroute) {
4491 enum cleanup_prefix_rt_t action;
4492 unsigned long rt_expires;
4493
4494 write_lock_bh(&ifp->idev->lock);
4495 action = check_cleanup_prefix_route(ifp, &rt_expires);
4496 write_unlock_bh(&ifp->idev->lock);
4497
4498 if (action != CLEANUP_PREFIX_RT_NOP) {
4499 cleanup_prefix_route(ifp, rt_expires,
4500 action == CLEANUP_PREFIX_RT_DEL);
4501 }
Thomas Haller761aac72014-01-15 15:36:58 +01004502 }
Jiri Pirko53bd6742013-12-06 09:45:22 +01004503
4504 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4505 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4506 valid_lft = prefered_lft = 0;
4507 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4508 !was_managetempaddr, jiffies);
4509 }
4510
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004511 addrconf_verify_rtnl();
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004512
4513 return 0;
4514}
4515
4516static int
David Ahernc21ef3e2017-04-16 09:48:24 -07004517inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4518 struct netlink_ext_ack *extack)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004519{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004520 struct net *net = sock_net(skb->sk);
Thomas Graf461d8832006-09-18 00:09:49 -07004521 struct ifaddrmsg *ifm;
4522 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004523 struct in6_addr *pfx, *peer_pfx;
Thomas Graf7198f8c2006-09-18 00:13:46 -07004524 struct inet6_ifaddr *ifa;
4525 struct net_device *dev;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004526 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
Jiri Pirko479840f2013-12-06 09:45:21 +01004527 u32 ifa_flags;
Thomas Graf461d8832006-09-18 00:09:49 -07004528 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004529
Johannes Bergfceb6432017-04-12 14:34:07 +02004530 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
David Ahernc21ef3e2017-04-16 09:48:24 -07004531 extack);
Thomas Graf461d8832006-09-18 00:09:49 -07004532 if (err < 0)
4533 return err;
4534
4535 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004536 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004537 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004538 return -EINVAL;
4539
Thomas Graf461d8832006-09-18 00:09:49 -07004540 if (tb[IFA_CACHEINFO]) {
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004541 struct ifa_cacheinfo *ci;
Thomas Graf461d8832006-09-18 00:09:49 -07004542
4543 ci = nla_data(tb[IFA_CACHEINFO]);
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004544 valid_lft = ci->ifa_valid;
Thomas Graf461d8832006-09-18 00:09:49 -07004545 preferred_lft = ci->ifa_prefered;
4546 } else {
4547 preferred_lft = INFINITY_LIFE_TIME;
4548 valid_lft = INFINITY_LIFE_TIME;
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004549 }
4550
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004551 dev = __dev_get_by_index(net, ifm->ifa_index);
Ian Morris63159f22015-03-29 14:00:04 +01004552 if (!dev)
Thomas Graf7198f8c2006-09-18 00:13:46 -07004553 return -ENODEV;
4554
Jiri Pirko479840f2013-12-06 09:45:21 +01004555 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4556
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004557 /* We ignore other flags so far. */
Thomas Haller761aac72014-01-15 15:36:58 +01004558 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
Madhu Challa93a714d2015-02-25 09:58:35 -08004559 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004560
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08004561 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
Ian Morris63159f22015-03-29 14:00:04 +01004562 if (!ifa) {
Thomas Graf7198f8c2006-09-18 00:13:46 -07004563 /*
4564 * It would be best to check for !NLM_F_CREATE here but
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08004565 * userspace already relies on not having to provide this.
Thomas Graf7198f8c2006-09-18 00:13:46 -07004566 */
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004567 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004568 ifm->ifa_prefixlen, ifa_flags,
4569 preferred_lft, valid_lft);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004570 }
4571
Thomas Graf7198f8c2006-09-18 00:13:46 -07004572 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4573 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4574 err = -EEXIST;
4575 else
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004576 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
Thomas Graf7198f8c2006-09-18 00:13:46 -07004577
4578 in6_ifa_put(ifa);
4579
4580 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004581}
4582
Jiri Pirko479840f2013-12-06 09:45:21 +01004583static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
Thomas Graf101bb222006-09-18 00:11:52 -07004584 u8 scope, int ifindex)
4585{
4586 struct ifaddrmsg *ifm;
4587
4588 ifm = nlmsg_data(nlh);
4589 ifm->ifa_family = AF_INET6;
4590 ifm->ifa_prefixlen = prefixlen;
4591 ifm->ifa_flags = flags;
4592 ifm->ifa_scope = scope;
4593 ifm->ifa_index = ifindex;
4594}
4595
Thomas Graf85486af2006-09-18 00:11:24 -07004596static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4597 unsigned long tstamp, u32 preferred, u32 valid)
4598{
4599 struct ifa_cacheinfo ci;
4600
Thomas Graf18a31e12010-11-17 04:12:02 +00004601 ci.cstamp = cstamp_delta(cstamp);
4602 ci.tstamp = cstamp_delta(tstamp);
Thomas Graf85486af2006-09-18 00:11:24 -07004603 ci.ifa_prefered = preferred;
4604 ci.ifa_valid = valid;
4605
4606 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4607}
4608
Thomas Graf101bb222006-09-18 00:11:52 -07004609static inline int rt_scope(int ifa_scope)
4610{
4611 if (ifa_scope & IFA_HOST)
4612 return RT_SCOPE_HOST;
4613 else if (ifa_scope & IFA_LINK)
4614 return RT_SCOPE_LINK;
4615 else if (ifa_scope & IFA_SITE)
4616 return RT_SCOPE_SITE;
4617 else
4618 return RT_SCOPE_UNIVERSE;
4619}
4620
Thomas Graf0ab68032006-09-18 00:12:35 -07004621static inline int inet6_ifaddr_msgsize(void)
4622{
Thomas Graf339bf982006-11-10 14:10:15 -08004623 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004624 + nla_total_size(16) /* IFA_LOCAL */
Thomas Graf339bf982006-11-10 14:10:15 -08004625 + nla_total_size(16) /* IFA_ADDRESS */
Jiri Pirko479840f2013-12-06 09:45:21 +01004626 + nla_total_size(sizeof(struct ifa_cacheinfo))
4627 + nla_total_size(4) /* IFA_FLAGS */;
Thomas Graf0ab68032006-09-18 00:12:35 -07004628}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07004629
Linus Torvalds1da177e2005-04-16 15:20:36 -07004630static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004631 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004632{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004633 struct nlmsghdr *nlh;
Thomas Graf85486af2006-09-18 00:11:24 -07004634 u32 preferred, valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004635
Eric W. Biederman15e47302012-09-07 20:12:54 +00004636 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004637 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004638 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004639
Thomas Graf101bb222006-09-18 00:11:52 -07004640 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4641 ifa->idev->dev->ifindex);
4642
Yasushi Asanofad8da32013-12-31 12:04:19 +09004643 if (!((ifa->flags&IFA_F_PERMANENT) &&
4644 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
Thomas Graf85486af2006-09-18 00:11:24 -07004645 preferred = ifa->prefered_lft;
4646 valid = ifa->valid_lft;
4647 if (preferred != INFINITY_LIFE_TIME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004648 long tval = (jiffies - ifa->tstamp)/HZ;
Jens Rosenbooma1faa692009-06-25 04:55:50 +00004649 if (preferred > tval)
4650 preferred -= tval;
4651 else
4652 preferred = 0;
Ben Hutchingsf56619f2010-06-26 11:37:47 +00004653 if (valid != INFINITY_LIFE_TIME) {
4654 if (valid > tval)
4655 valid -= tval;
4656 else
4657 valid = 0;
4658 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004659 }
4660 } else {
Thomas Graf85486af2006-09-18 00:11:24 -07004661 preferred = INFINITY_LIFE_TIME;
4662 valid = INFINITY_LIFE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004663 }
Thomas Graf85486af2006-09-18 00:11:24 -07004664
Cong Wang7996c792013-05-22 05:41:06 +00004665 if (!ipv6_addr_any(&ifa->peer_addr)) {
Jiri Benc930345e2015-03-29 16:59:25 +02004666 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4667 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004668 goto error;
4669 } else
Jiri Benc930345e2015-03-29 16:59:25 +02004670 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004671 goto error;
4672
4673 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4674 goto error;
Thomas Graf85486af2006-09-18 00:11:24 -07004675
Jiri Pirko479840f2013-12-06 09:45:21 +01004676 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4677 goto error;
4678
Johannes Berg053c0952015-01-16 22:09:00 +01004679 nlmsg_end(skb, nlh);
4680 return 0;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004681
4682error:
4683 nlmsg_cancel(skb, nlh);
4684 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004685}
4686
4687static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004688 u32 portid, u32 seq, int event, u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004689{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004690 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004691 u8 scope = RT_SCOPE_UNIVERSE;
4692 int ifindex = ifmca->idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004693
Thomas Graf101bb222006-09-18 00:11:52 -07004694 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4695 scope = RT_SCOPE_SITE;
4696
Eric W. Biederman15e47302012-09-07 20:12:54 +00004697 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004698 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004699 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004700
Thomas Graf101bb222006-09-18 00:11:52 -07004701 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004702 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004703 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004704 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4705 nlmsg_cancel(skb, nlh);
4706 return -EMSGSIZE;
4707 }
Thomas Graf85486af2006-09-18 00:11:24 -07004708
Johannes Berg053c0952015-01-16 22:09:00 +01004709 nlmsg_end(skb, nlh);
4710 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004711}
4712
4713static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004714 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004715{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004716 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004717 u8 scope = RT_SCOPE_UNIVERSE;
4718 int ifindex = ifaca->aca_idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004719
Thomas Graf101bb222006-09-18 00:11:52 -07004720 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4721 scope = RT_SCOPE_SITE;
4722
Eric W. Biederman15e47302012-09-07 20:12:54 +00004723 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004724 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004725 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004726
Thomas Graf101bb222006-09-18 00:11:52 -07004727 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004728 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004729 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004730 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4731 nlmsg_cancel(skb, nlh);
4732 return -EMSGSIZE;
4733 }
Thomas Graf85486af2006-09-18 00:11:24 -07004734
Johannes Berg053c0952015-01-16 22:09:00 +01004735 nlmsg_end(skb, nlh);
4736 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004737}
4738
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004739enum addr_type_t {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004740 UNICAST_ADDR,
4741 MULTICAST_ADDR,
4742 ANYCAST_ADDR,
4743};
4744
Eric Dumazet234b27c2009-11-12 04:11:50 +00004745/* called with rcu_read_lock() */
4746static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4747 struct netlink_callback *cb, enum addr_type_t type,
4748 int s_ip_idx, int *p_ip_idx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004749{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004750 struct ifmcaddr6 *ifmca;
4751 struct ifacaddr6 *ifaca;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004752 int err = 1;
4753 int ip_idx = *p_ip_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004754
Eric Dumazet234b27c2009-11-12 04:11:50 +00004755 read_lock_bh(&idev->lock);
4756 switch (type) {
stephen hemminger502a2ff2010-03-17 20:31:13 +00004757 case UNICAST_ADDR: {
4758 struct inet6_ifaddr *ifa;
4759
Eric Dumazet234b27c2009-11-12 04:11:50 +00004760 /* unicast address incl. temp addr */
stephen hemminger502a2ff2010-03-17 20:31:13 +00004761 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4762 if (++ip_idx < s_ip_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004763 continue;
4764 err = inet6_fill_ifaddr(skb, ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004765 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004766 cb->nlh->nlmsg_seq,
4767 RTM_NEWADDR,
4768 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004769 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004770 break;
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004771 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004772 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004773 break;
stephen hemminger502a2ff2010-03-17 20:31:13 +00004774 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004775 case MULTICAST_ADDR:
4776 /* multicast address */
4777 for (ifmca = idev->mc_list; ifmca;
4778 ifmca = ifmca->next, ip_idx++) {
4779 if (ip_idx < s_ip_idx)
4780 continue;
4781 err = inet6_fill_ifmcaddr(skb, ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004782 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004783 cb->nlh->nlmsg_seq,
4784 RTM_GETMULTICAST,
4785 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004786 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004787 break;
4788 }
4789 break;
4790 case ANYCAST_ADDR:
4791 /* anycast address */
4792 for (ifaca = idev->ac_list; ifaca;
4793 ifaca = ifaca->aca_next, ip_idx++) {
4794 if (ip_idx < s_ip_idx)
4795 continue;
4796 err = inet6_fill_ifacaddr(skb, ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004797 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004798 cb->nlh->nlmsg_seq,
4799 RTM_GETANYCAST,
4800 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004801 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004802 break;
4803 }
4804 break;
4805 default:
4806 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004807 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004808 read_unlock_bh(&idev->lock);
4809 *p_ip_idx = ip_idx;
4810 return err;
4811}
4812
4813static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4814 enum addr_type_t type)
4815{
4816 struct net *net = sock_net(skb->sk);
4817 int h, s_h;
4818 int idx, ip_idx;
4819 int s_idx, s_ip_idx;
4820 struct net_device *dev;
4821 struct inet6_dev *idev;
4822 struct hlist_head *head;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004823
4824 s_h = cb->args[0];
4825 s_idx = idx = cb->args[1];
4826 s_ip_idx = ip_idx = cb->args[2];
4827
4828 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004829 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004830 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4831 idx = 0;
4832 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08004833 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet234b27c2009-11-12 04:11:50 +00004834 if (idx < s_idx)
4835 goto cont;
Patrick McHardy4b97efd2010-03-26 20:27:49 -07004836 if (h > s_h || idx > s_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004837 s_ip_idx = 0;
4838 ip_idx = 0;
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004839 idev = __in6_dev_get(dev);
4840 if (!idev)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004841 goto cont;
4842
4843 if (in6_dump_addrs(idev, skb, cb, type,
David S. Miller7b46a642015-01-18 23:36:08 -05004844 s_ip_idx, &ip_idx) < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004845 goto done;
4846cont:
4847 idx++;
4848 }
4849 }
4850done:
4851 rcu_read_unlock();
4852 cb->args[0] = h;
4853 cb->args[1] = idx;
4854 cb->args[2] = ip_idx;
4855
Linus Torvalds1da177e2005-04-16 15:20:36 -07004856 return skb->len;
4857}
4858
4859static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4860{
4861 enum addr_type_t type = UNICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004862
Linus Torvalds1da177e2005-04-16 15:20:36 -07004863 return inet6_dump_addr(skb, cb, type);
4864}
4865
4866static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4867{
4868 enum addr_type_t type = MULTICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004869
Linus Torvalds1da177e2005-04-16 15:20:36 -07004870 return inet6_dump_addr(skb, cb, type);
4871}
4872
4873
4874static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4875{
4876 enum addr_type_t type = ANYCAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004877
Linus Torvalds1da177e2005-04-16 15:20:36 -07004878 return inet6_dump_addr(skb, cb, type);
4879}
4880
David Ahernc21ef3e2017-04-16 09:48:24 -07004881static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4882 struct netlink_ext_ack *extack)
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004883{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004884 struct net *net = sock_net(in_skb->sk);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004885 struct ifaddrmsg *ifm;
4886 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004887 struct in6_addr *addr = NULL, *peer;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004888 struct net_device *dev = NULL;
4889 struct inet6_ifaddr *ifa;
4890 struct sk_buff *skb;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004891 int err;
4892
Johannes Bergfceb6432017-04-12 14:34:07 +02004893 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
David Ahernc21ef3e2017-04-16 09:48:24 -07004894 extack);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004895 if (err < 0)
4896 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004897
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004898 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
Ian Morris63159f22015-03-29 14:00:04 +01004899 if (!addr) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004900 err = -EINVAL;
4901 goto errout;
4902 }
4903
4904 ifm = nlmsg_data(nlh);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004905 if (ifm->ifa_index)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004906 dev = __dev_get_by_index(net, ifm->ifa_index);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004907
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004908 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4909 if (!ifa) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004910 err = -EADDRNOTAVAIL;
4911 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004912 }
4913
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004914 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4915 if (!skb) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004916 err = -ENOBUFS;
4917 goto errout_ifa;
4918 }
4919
Eric W. Biederman15e47302012-09-07 20:12:54 +00004920 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004921 nlh->nlmsg_seq, RTM_NEWADDR, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004922 if (err < 0) {
4923 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4924 WARN_ON(err == -EMSGSIZE);
4925 kfree_skb(skb);
4926 goto errout_ifa;
4927 }
Eric W. Biederman15e47302012-09-07 20:12:54 +00004928 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004929errout_ifa:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004930 in6_ifa_put(ifa);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004931errout:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004932 return err;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004933}
4934
Linus Torvalds1da177e2005-04-16 15:20:36 -07004935static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4936{
4937 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09004938 struct net *net = dev_net(ifa->idev->dev);
Thomas Graf5d620262006-08-15 00:35:02 -07004939 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004940
Mahesh Bandewarf784ad32017-01-04 15:01:01 -08004941 /* Don't send DELADDR notification for TENTATIVE address,
4942 * since NEWADDR notification is sent only after removing
Mike Manning6819a142017-09-04 15:52:55 +01004943 * TENTATIVE flag, if DAD has not failed.
Mahesh Bandewarf784ad32017-01-04 15:01:01 -08004944 */
Mike Manning6819a142017-09-04 15:52:55 +01004945 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4946 event == RTM_DELADDR)
Mahesh Bandewarf784ad32017-01-04 15:01:01 -08004947 return;
4948
Thomas Graf0ab68032006-09-18 00:12:35 -07004949 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01004950 if (!skb)
Thomas Graf5d620262006-08-15 00:35:02 -07004951 goto errout;
4952
4953 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004954 if (err < 0) {
4955 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4956 WARN_ON(err == -EMSGSIZE);
4957 kfree_skb(skb);
4958 goto errout;
4959 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08004960 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4961 return;
Thomas Graf5d620262006-08-15 00:35:02 -07004962errout:
4963 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004964 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004965}
4966
Dave Jonesb6f99a22007-03-22 12:27:49 -07004967static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004968 __s32 *array, int bytes)
4969{
Thomas Graf04561c12006-11-14 19:53:58 -08004970 BUG_ON(bytes < (DEVCONF_MAX * 4));
4971
Linus Torvalds1da177e2005-04-16 15:20:36 -07004972 memset(array, 0, bytes);
4973 array[DEVCONF_FORWARDING] = cnf->forwarding;
4974 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4975 array[DEVCONF_MTU6] = cnf->mtu6;
4976 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4977 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4978 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4979 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4980 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
Thomas Graf93908d12010-11-17 01:44:24 +00004981 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4982 jiffies_to_msecs(cnf->rtr_solicit_interval);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004983 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4984 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
Thomas Graf93908d12010-11-17 01:44:24 +00004985 array[DEVCONF_RTR_SOLICIT_DELAY] =
4986 jiffies_to_msecs(cnf->rtr_solicit_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004987 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +02004988 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4989 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4990 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4991 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004992 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4993 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4994 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4995 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4996 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004997 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08004998 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
Hangbin Liu8013d1d2015-07-30 14:28:42 +08004999 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -08005000 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005001#ifdef CONFIG_IPV6_ROUTER_PREF
5002 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
Thomas Graf93908d12010-11-17 01:44:24 +00005003 array[DEVCONF_RTR_PROBE_INTERVAL] =
5004 jiffies_to_msecs(cnf->rtr_probe_interval);
Neil Hormanfa03ef32007-01-30 14:30:10 -08005005#ifdef CONFIG_IPV6_ROUTE_INFO
Joel Scherpelzbbea1242017-03-22 18:19:04 +09005006 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08005007 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5008#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005009#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -07005010 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -07005011 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
Neil Horman95c385b2007-04-25 17:08:10 -07005012#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5013 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
Erik Kline7fd25612014-10-28 18:11:14 +09005014 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
Neil Horman95c385b2007-04-25 17:08:10 -07005015#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09005016#ifdef CONFIG_IPV6_MROUTE
5017 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5018#endif
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +09005019 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09005020 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
Cosmin Ratiuc3faca02009-10-09 03:11:14 +00005021 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +00005022 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +02005023 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
Ben Greeard9333192014-06-25 14:44:53 -07005024 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
Harout Hedeshianc2943f12015-01-20 10:06:05 -07005025 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
Andy Gospodarek35103d12015-08-13 10:39:01 -04005026 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005027 /* we omit DEVCONF_STABLE_SECRET for now */
Erik Kline3985e8a2015-07-22 16:38:25 +09005028 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
Johannes Bergabbc3042016-02-04 13:31:19 +01005029 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
Johannes Berg7a02bf82016-02-04 13:31:20 +01005030 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
David Ahernf1705ec2016-02-24 09:25:37 -08005031 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
David Lebrun1ababeb2016-11-08 14:57:39 +01005032 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
David Lebrunbf355b82016-11-08 14:57:42 +01005033#ifdef CONFIG_IPV6_SEG6_HMAC
5034 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5035#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -08005036 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
Felix Jiad35a00b2017-01-26 16:59:17 +13005037 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
David Forsterdf789fe2017-02-23 16:27:18 +00005038 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005039}
5040
Thomas Grafb382b192010-11-16 04:33:57 +00005041static inline size_t inet6_ifla6_size(void)
5042{
5043 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5044 + nla_total_size(sizeof(struct ifla_cacheinfo))
5045 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5046 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005047 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5048 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
Thomas Grafb382b192010-11-16 04:33:57 +00005049}
5050
Thomas Graf339bf982006-11-10 14:10:15 -08005051static inline size_t inet6_if_nlmsg_size(void)
5052{
5053 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5054 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5055 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5056 + nla_total_size(4) /* IFLA_MTU */
5057 + nla_total_size(4) /* IFLA_LINK */
Andy Gospodarek03443382015-08-13 15:26:35 -04005058 + nla_total_size(1) /* IFLA_OPERSTATE */
Thomas Grafb382b192010-11-16 04:33:57 +00005059 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
Thomas Graf339bf982006-11-10 14:10:15 -08005060}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005061
Eric Dumazetbe281e52011-05-19 01:14:23 +00005062static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
Jia Heaca05672016-09-30 11:29:03 +08005063 int bytes)
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005064{
5065 int i;
Jia Heaca05672016-09-30 11:29:03 +08005066 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005067 BUG_ON(pad < 0);
5068
5069 /* Use put_unaligned() because stats may not be aligned for u64. */
Jia Heaca05672016-09-30 11:29:03 +08005070 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5071 for (i = 1; i < ICMP6_MIB_MAX; i++)
Eric Dumazetbe281e52011-05-19 01:14:23 +00005072 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005073
Jia Heaca05672016-09-30 11:29:03 +08005074 memset(&stats[ICMP6_MIB_MAX], 0, pad);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005075}
5076
WANG Cong698365f2014-05-05 15:55:55 -07005077static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305078 int bytes, size_t syncpoff)
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005079{
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305080 int i, c;
5081 u64 buff[IPSTATS_MIB_MAX];
5082 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5083
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005084 BUG_ON(pad < 0);
5085
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305086 memset(buff, 0, sizeof(buff));
5087 buff[0] = IPSTATS_MIB_MAX;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005088
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305089 for_each_possible_cpu(c) {
5090 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5091 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5092 }
5093
5094 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5095 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005096}
5097
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005098static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5099 int bytes)
5100{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07005101 switch (attrtype) {
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005102 case IFLA_INET6_STATS:
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305103 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5104 offsetof(struct ipstats_mib, syncp));
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005105 break;
5106 case IFLA_INET6_ICMP6STATS:
Jia Heaca05672016-09-30 11:29:03 +08005107 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005108 break;
5109 }
5110}
5111
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005112static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5113 u32 ext_filter_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005114{
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005115 struct nlattr *nla;
Thomas Graf04561c12006-11-14 19:53:58 -08005116 struct ifla_cacheinfo ci;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005117
David S. Millerc78679e2012-04-01 20:27:33 -04005118 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5119 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005120 ci.max_reasm_len = IPV6_MAXPLEN;
David S. Miller24912422010-11-19 13:13:47 -08005121 ci.tstamp = cstamp_delta(idev->tstamp);
5122 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
Jiri Pirko1f9248e2013-12-07 19:26:53 +01005123 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
David S. Millerc78679e2012-04-01 20:27:33 -04005124 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5125 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005126 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
Ian Morris63159f22015-03-29 14:00:04 +01005127 if (!nla)
Thomas Graf04561c12006-11-14 19:53:58 -08005128 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005129 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005130
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005131 /* XXX - MC not implemented */
5132
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005133 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5134 return 0;
5135
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005136 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005137 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005138 goto nla_put_failure;
5139 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5140
5141 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005142 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005143 goto nla_put_failure;
5144 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005145
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005146 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
Ian Morris63159f22015-03-29 14:00:04 +01005147 if (!nla)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005148 goto nla_put_failure;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005149
Felix Jiad35a00b2017-01-26 16:59:17 +13005150 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005151 goto nla_put_failure;
5152
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005153 read_lock_bh(&idev->lock);
5154 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5155 read_unlock_bh(&idev->lock);
5156
Thomas Grafb382b192010-11-16 04:33:57 +00005157 return 0;
5158
5159nla_put_failure:
5160 return -EMSGSIZE;
5161}
5162
Arad, Ronenb1974ed2015-10-19 09:23:28 -07005163static size_t inet6_get_link_af_size(const struct net_device *dev,
5164 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005165{
5166 if (!__in6_dev_get(dev))
5167 return 0;
5168
5169 return inet6_ifla6_size();
5170}
5171
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005172static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5173 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005174{
5175 struct inet6_dev *idev = __in6_dev_get(dev);
5176
5177 if (!idev)
5178 return -ENODATA;
5179
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005180 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005181 return -EMSGSIZE;
5182
5183 return 0;
5184}
5185
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005186static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5187{
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005188 struct inet6_ifaddr *ifp;
5189 struct net_device *dev = idev->dev;
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005190 bool clear_token, update_rs = false;
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005191 struct in6_addr ll_addr;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005192
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005193 ASSERT_RTNL();
5194
Ian Morris63159f22015-03-29 14:00:04 +01005195 if (!token)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005196 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005197 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5198 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005199 if (!ipv6_accept_ra(idev))
5200 return -EINVAL;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005201 if (idev->cnf.rtr_solicits == 0)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005202 return -EINVAL;
5203
5204 write_lock_bh(&idev->lock);
5205
5206 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5207 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5208
5209 write_unlock_bh(&idev->lock);
5210
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005211 clear_token = ipv6_addr_any(token);
5212 if (clear_token)
5213 goto update_lft;
5214
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005215 if (!idev->dead && (idev->if_flags & IF_READY) &&
5216 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5217 IFA_F_OPTIMISTIC)) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005218 /* If we're not ready, then normal ifup will take care
5219 * of this. Otherwise, we need to request our rs here.
5220 */
5221 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5222 update_rs = true;
5223 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005224
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005225update_lft:
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005226 write_lock_bh(&idev->lock);
Daniel Borkmannfc403832013-04-09 03:47:15 +00005227
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005228 if (update_rs) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005229 idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005230 idev->rs_interval = rfc3315_s14_backoff_init(
5231 idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005232 idev->rs_probes = 1;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005233 addrconf_mod_rs_timer(idev, idev->rs_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005234 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005235
5236 /* Well, that's kinda nasty ... */
5237 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5238 spin_lock(&ifp->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00005239 if (ifp->tokenized) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005240 ifp->valid_lft = 0;
5241 ifp->prefered_lft = 0;
5242 }
5243 spin_unlock(&ifp->lock);
5244 }
5245
5246 write_unlock_bh(&idev->lock);
Lubomir Rintelb2ed64a2014-10-27 17:39:16 +01005247 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005248 addrconf_verify_rtnl();
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005249 return 0;
5250}
5251
Daniel Borkmann11b1f822015-02-05 14:39:11 +01005252static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5253 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5254 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5255};
5256
5257static int inet6_validate_link_af(const struct net_device *dev,
5258 const struct nlattr *nla)
5259{
5260 struct nlattr *tb[IFLA_INET6_MAX + 1];
5261
5262 if (dev && !__in6_dev_get(dev))
5263 return -EAFNOSUPPORT;
5264
Johannes Bergfceb6432017-04-12 14:34:07 +02005265 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5266 NULL);
Daniel Borkmann11b1f822015-02-05 14:39:11 +01005267}
5268
Felix Jiad35a00b2017-01-26 16:59:17 +13005269static int check_addr_gen_mode(int mode)
5270{
5271 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5272 mode != IN6_ADDR_GEN_MODE_NONE &&
5273 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5274 mode != IN6_ADDR_GEN_MODE_RANDOM)
5275 return -EINVAL;
5276 return 1;
5277}
5278
5279static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5280 int mode)
5281{
5282 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5283 !idev->cnf.stable_secret.initialized &&
5284 !net->ipv6.devconf_dflt->stable_secret.initialized)
5285 return -EINVAL;
5286 return 1;
5287}
5288
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005289static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5290{
5291 int err = -EINVAL;
5292 struct inet6_dev *idev = __in6_dev_get(dev);
5293 struct nlattr *tb[IFLA_INET6_MAX + 1];
5294
5295 if (!idev)
5296 return -EAFNOSUPPORT;
5297
Johannes Bergfceb6432017-04-12 14:34:07 +02005298 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005299 BUG();
5300
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005301 if (tb[IFLA_INET6_TOKEN]) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005302 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005303 if (err)
5304 return err;
5305 }
5306
5307 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5308 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5309
Felix Jiad35a00b2017-01-26 16:59:17 +13005310 if (check_addr_gen_mode(mode) < 0 ||
5311 check_stable_privacy(idev, dev_net(dev), mode) < 0)
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005312 return -EINVAL;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005313
Felix Jiad35a00b2017-01-26 16:59:17 +13005314 idev->cnf.addr_gen_mode = mode;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005315 err = 0;
5316 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005317
5318 return err;
5319}
5320
Thomas Grafb382b192010-11-16 04:33:57 +00005321static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005322 u32 portid, u32 seq, int event, unsigned int flags)
Thomas Grafb382b192010-11-16 04:33:57 +00005323{
5324 struct net_device *dev = idev->dev;
5325 struct ifinfomsg *hdr;
5326 struct nlmsghdr *nlh;
5327 void *protoinfo;
5328
Eric W. Biederman15e47302012-09-07 20:12:54 +00005329 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005330 if (!nlh)
Thomas Grafb382b192010-11-16 04:33:57 +00005331 return -EMSGSIZE;
5332
5333 hdr = nlmsg_data(nlh);
5334 hdr->ifi_family = AF_INET6;
5335 hdr->__ifi_pad = 0;
5336 hdr->ifi_type = dev->type;
5337 hdr->ifi_index = dev->ifindex;
5338 hdr->ifi_flags = dev_get_flags(dev);
5339 hdr->ifi_change = 0;
5340
David S. Millerc78679e2012-04-01 20:27:33 -04005341 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5342 (dev->addr_len &&
5343 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5344 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
Nicolas Dichtela54acb32015-04-02 17:07:00 +02005345 (dev->ifindex != dev_get_iflink(dev) &&
Andy Gospodarek03443382015-08-13 15:26:35 -04005346 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5347 nla_put_u8(skb, IFLA_OPERSTATE,
5348 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
David S. Millerc78679e2012-04-01 20:27:33 -04005349 goto nla_put_failure;
Thomas Grafb382b192010-11-16 04:33:57 +00005350 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
Ian Morris63159f22015-03-29 14:00:04 +01005351 if (!protoinfo)
Thomas Grafb382b192010-11-16 04:33:57 +00005352 goto nla_put_failure;
5353
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005354 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005355 goto nla_put_failure;
5356
Thomas Graf04561c12006-11-14 19:53:58 -08005357 nla_nest_end(skb, protoinfo);
Johannes Berg053c0952015-01-16 22:09:00 +01005358 nlmsg_end(skb, nlh);
5359 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005360
Thomas Graf04561c12006-11-14 19:53:58 -08005361nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005362 nlmsg_cancel(skb, nlh);
5363 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005364}
5365
5366static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5367{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09005368 struct net *net = sock_net(skb->sk);
Eric Dumazet84d26972009-11-09 12:11:28 +00005369 int h, s_h;
David S. Miller434a8a52009-11-11 18:53:00 -08005370 int idx = 0, s_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005371 struct net_device *dev;
5372 struct inet6_dev *idev;
Eric Dumazet84d26972009-11-09 12:11:28 +00005373 struct hlist_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005374
Eric Dumazet84d26972009-11-09 12:11:28 +00005375 s_h = cb->args[0];
5376 s_idx = cb->args[1];
5377
5378 rcu_read_lock();
5379 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5380 idx = 0;
5381 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08005382 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet84d26972009-11-09 12:11:28 +00005383 if (idx < s_idx)
5384 goto cont;
5385 idev = __in6_dev_get(dev);
5386 if (!idev)
5387 goto cont;
5388 if (inet6_fill_ifinfo(skb, idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005389 NETLINK_CB(cb->skb).portid,
Eric Dumazet84d26972009-11-09 12:11:28 +00005390 cb->nlh->nlmsg_seq,
Johannes Berg053c0952015-01-16 22:09:00 +01005391 RTM_NEWLINK, NLM_F_MULTI) < 0)
Eric Dumazet84d26972009-11-09 12:11:28 +00005392 goto out;
Pavel Emelianov7562f872007-05-03 15:13:45 -07005393cont:
Eric Dumazet84d26972009-11-09 12:11:28 +00005394 idx++;
5395 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005396 }
Eric Dumazet84d26972009-11-09 12:11:28 +00005397out:
5398 rcu_read_unlock();
5399 cb->args[1] = idx;
5400 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005401
5402 return skb->len;
5403}
5404
5405void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5406{
5407 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005408 struct net *net = dev_net(idev->dev);
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005409 int err = -ENOBUFS;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005410
Thomas Graf339bf982006-11-10 14:10:15 -08005411 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005412 if (!skb)
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005413 goto errout;
5414
5415 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005416 if (err < 0) {
5417 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5418 WARN_ON(err == -EMSGSIZE);
5419 kfree_skb(skb);
5420 goto errout;
5421 }
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005422 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005423 return;
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005424errout:
5425 if (err < 0)
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005426 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005427}
5428
Thomas Graf339bf982006-11-10 14:10:15 -08005429static inline size_t inet6_prefix_nlmsg_size(void)
5430{
5431 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5432 + nla_total_size(sizeof(struct in6_addr))
5433 + nla_total_size(sizeof(struct prefix_cacheinfo));
5434}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005435
Linus Torvalds1da177e2005-04-16 15:20:36 -07005436static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005437 struct prefix_info *pinfo, u32 portid, u32 seq,
Thomas Graf6051e2f2006-11-14 19:54:19 -08005438 int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005439{
Thomas Graf6051e2f2006-11-14 19:54:19 -08005440 struct prefixmsg *pmsg;
5441 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005442 struct prefix_cacheinfo ci;
5443
Eric W. Biederman15e47302012-09-07 20:12:54 +00005444 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005445 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08005446 return -EMSGSIZE;
Thomas Graf6051e2f2006-11-14 19:54:19 -08005447
5448 pmsg = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005449 pmsg->prefix_family = AF_INET6;
Patrick McHardy8a470772005-06-28 12:56:45 -07005450 pmsg->prefix_pad1 = 0;
5451 pmsg->prefix_pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005452 pmsg->prefix_ifindex = idev->dev->ifindex;
5453 pmsg->prefix_len = pinfo->prefix_len;
5454 pmsg->prefix_type = pinfo->type;
Patrick McHardy8a470772005-06-28 12:56:45 -07005455 pmsg->prefix_pad3 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005456 pmsg->prefix_flags = 0;
5457 if (pinfo->onlink)
5458 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5459 if (pinfo->autoconf)
5460 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5461
David S. Millerc78679e2012-04-01 20:27:33 -04005462 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5463 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005464 ci.preferred_time = ntohl(pinfo->prefered);
5465 ci.valid_time = ntohl(pinfo->valid);
David S. Millerc78679e2012-04-01 20:27:33 -04005466 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5467 goto nla_put_failure;
Johannes Berg053c0952015-01-16 22:09:00 +01005468 nlmsg_end(skb, nlh);
5469 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005470
Thomas Graf6051e2f2006-11-14 19:54:19 -08005471nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005472 nlmsg_cancel(skb, nlh);
5473 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005474}
5475
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005476static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005477 struct prefix_info *pinfo)
5478{
5479 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005480 struct net *net = dev_net(idev->dev);
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005481 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005482
Thomas Graf339bf982006-11-10 14:10:15 -08005483 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005484 if (!skb)
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005485 goto errout;
5486
5487 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005488 if (err < 0) {
5489 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5490 WARN_ON(err == -EMSGSIZE);
5491 kfree_skb(skb);
5492 goto errout;
5493 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005494 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5495 return;
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005496errout:
5497 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08005498 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005499}
5500
Linus Torvalds1da177e2005-04-16 15:20:36 -07005501static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5502{
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005503 struct net *net = dev_net(ifp->idev->dev);
5504
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005505 if (event)
5506 ASSERT_RTNL();
5507
Linus Torvalds1da177e2005-04-16 15:20:36 -07005508 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5509
5510 switch (event) {
5511 case RTM_NEWADDR:
Neil Horman95c385b2007-04-25 17:08:10 -07005512 /*
5513 * If the address was optimistic
5514 * we inserted the route at the start of
5515 * our DAD process, so we don't need
5516 * to do it again
5517 */
Wei Wang4e587ea2017-08-25 15:03:10 -07005518 if (!rcu_access_pointer(ifp->rt->rt6i_node))
Neil Horman95c385b2007-04-25 17:08:10 -07005519 ip6_ins_rt(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005520 if (ifp->idev->cnf.forwarding)
5521 addrconf_join_anycast(ifp);
Cong Wang7996c792013-05-22 05:41:06 +00005522 if (!ipv6_addr_any(&ifp->peer_addr))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005523 addrconf_prefix_route(&ifp->peer_addr, 128,
5524 ifp->idev->dev, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005525 break;
5526 case RTM_DELADDR:
5527 if (ifp->idev->cnf.forwarding)
5528 addrconf_leave_anycast(ifp);
5529 addrconf_leave_solict(ifp->idev, &ifp->addr);
Cong Wang7996c792013-05-22 05:41:06 +00005530 if (!ipv6_addr_any(&ifp->peer_addr)) {
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005531 struct rt6_info *rt;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005532
Nicolas Dichtele7478df2014-09-03 23:59:22 +02005533 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5534 ifp->idev->dev, 0, 0);
Martin KaFai Lau8e3d5be2015-09-15 14:30:08 -07005535 if (rt)
5536 ip6_del_rt(rt);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005537 }
David Ahern38bd10c2016-04-21 20:56:12 -07005538 if (ifp->rt) {
Wei Wangad65a2f2017-06-17 10:42:35 -07005539 if (dst_hold_safe(&ifp->rt->dst))
5540 ip6_del_rt(ifp->rt);
David Ahern38bd10c2016-04-21 20:56:12 -07005541 }
Hannes Frederic Sowa705f1c82014-09-28 00:46:06 +02005542 rt_genid_bump_ipv6(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005543 break;
5544 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005545 atomic_inc(&net->ipv6.dev_addr_genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005546}
5547
5548static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5549{
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005550 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005551 if (likely(ifp->idev->dead == 0))
5552 __ipv6_ifa_notify(event, ifp);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005553 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005554}
5555
5556#ifdef CONFIG_SYSCTL
5557
5558static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005559int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005560 void __user *buffer, size_t *lenp, loff_t *ppos)
5561{
5562 int *valp = ctl->data;
5563 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005564 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005565 struct ctl_table lctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005566 int ret;
5567
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005568 /*
5569 * ctl->data points to idev->cnf.forwarding, we should
5570 * not modify it until we get the rtnl lock.
5571 */
5572 lctl = *ctl;
5573 lctl.data = &val;
5574
5575 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005576
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -08005577 if (write)
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +00005578 ret = addrconf_fixup_forwarding(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005579 if (ret)
5580 *ppos = pos;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005581 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005582}
5583
Marcelo Leitner77751422015-02-23 11:17:13 -03005584static
5585int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5586 void __user *buffer, size_t *lenp, loff_t *ppos)
5587{
5588 struct inet6_dev *idev = ctl->extra1;
5589 int min_mtu = IPV6_MIN_MTU;
5590 struct ctl_table lctl;
5591
5592 lctl = *ctl;
5593 lctl.extra1 = &min_mtu;
5594 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5595
5596 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5597}
5598
Brian Haley56d417b2009-06-01 03:07:33 -07005599static void dev_disable_change(struct inet6_dev *idev)
5600{
Cong Wang75538c22013-05-29 11:30:50 +08005601 struct netdev_notifier_info info;
5602
Brian Haley56d417b2009-06-01 03:07:33 -07005603 if (!idev || !idev->dev)
5604 return;
5605
Cong Wang75538c22013-05-29 11:30:50 +08005606 netdev_notifier_info_init(&info, idev->dev);
Brian Haley56d417b2009-06-01 03:07:33 -07005607 if (idev->cnf.disable_ipv6)
Cong Wang75538c22013-05-29 11:30:50 +08005608 addrconf_notify(NULL, NETDEV_DOWN, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005609 else
Cong Wang75538c22013-05-29 11:30:50 +08005610 addrconf_notify(NULL, NETDEV_UP, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005611}
5612
5613static void addrconf_disable_change(struct net *net, __s32 newf)
5614{
5615 struct net_device *dev;
5616 struct inet6_dev *idev;
5617
Kefeng Wang03e4def2017-01-19 16:26:21 +08005618 for_each_netdev(net, dev) {
Brian Haley56d417b2009-06-01 03:07:33 -07005619 idev = __in6_dev_get(dev);
5620 if (idev) {
5621 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5622 idev->cnf.disable_ipv6 = newf;
5623 if (changed)
5624 dev_disable_change(idev);
5625 }
Brian Haley56d417b2009-06-01 03:07:33 -07005626 }
Brian Haley56d417b2009-06-01 03:07:33 -07005627}
5628
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005629static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
Brian Haley56d417b2009-06-01 03:07:33 -07005630{
5631 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005632 int old;
5633
5634 if (!rtnl_trylock())
5635 return restart_syscall();
Brian Haley56d417b2009-06-01 03:07:33 -07005636
5637 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005638 old = *p;
5639 *p = newf;
Brian Haley56d417b2009-06-01 03:07:33 -07005640
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005641 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5642 rtnl_unlock();
Brian Haley56d417b2009-06-01 03:07:33 -07005643 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005644 }
Brian Haley56d417b2009-06-01 03:07:33 -07005645
5646 if (p == &net->ipv6.devconf_all->disable_ipv6) {
Brian Haley56d417b2009-06-01 03:07:33 -07005647 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5648 addrconf_disable_change(net, newf);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005649 } else if ((!newf) ^ (!old))
Brian Haley56d417b2009-06-01 03:07:33 -07005650 dev_disable_change((struct inet6_dev *)table->extra1);
5651
5652 rtnl_unlock();
5653 return 0;
5654}
5655
5656static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005657int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
Brian Haley56d417b2009-06-01 03:07:33 -07005658 void __user *buffer, size_t *lenp, loff_t *ppos)
5659{
5660 int *valp = ctl->data;
5661 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005662 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005663 struct ctl_table lctl;
Brian Haley56d417b2009-06-01 03:07:33 -07005664 int ret;
5665
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005666 /*
5667 * ctl->data points to idev->cnf.disable_ipv6, we should
5668 * not modify it until we get the rtnl lock.
5669 */
5670 lctl = *ctl;
5671 lctl.data = &val;
5672
5673 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Brian Haley56d417b2009-06-01 03:07:33 -07005674
5675 if (write)
5676 ret = addrconf_disable_ipv6(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005677 if (ret)
5678 *ppos = pos;
Brian Haley56d417b2009-06-01 03:07:33 -07005679 return ret;
5680}
5681
stephen hemmingerc92d5492013-12-17 22:37:14 -08005682static
5683int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5684 void __user *buffer, size_t *lenp, loff_t *ppos)
5685{
5686 int *valp = ctl->data;
5687 int ret;
5688 int old, new;
5689
5690 old = *valp;
5691 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5692 new = *valp;
5693
5694 if (write && old != new) {
5695 struct net *net = ctl->extra2;
5696
5697 if (!rtnl_trylock())
5698 return restart_syscall();
5699
5700 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
David Ahern85b3daa2017-03-28 14:28:04 -07005701 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5702 NETCONFA_PROXY_NEIGH,
stephen hemmingerc92d5492013-12-17 22:37:14 -08005703 NETCONFA_IFINDEX_DEFAULT,
5704 net->ipv6.devconf_dflt);
5705 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
David Ahern85b3daa2017-03-28 14:28:04 -07005706 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5707 NETCONFA_PROXY_NEIGH,
stephen hemmingerc92d5492013-12-17 22:37:14 -08005708 NETCONFA_IFINDEX_ALL,
5709 net->ipv6.devconf_all);
5710 else {
5711 struct inet6_dev *idev = ctl->extra1;
5712
David Ahern85b3daa2017-03-28 14:28:04 -07005713 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5714 NETCONFA_PROXY_NEIGH,
stephen hemmingerc92d5492013-12-17 22:37:14 -08005715 idev->dev->ifindex,
5716 &idev->cnf);
5717 }
5718 rtnl_unlock();
5719 }
5720
5721 return ret;
5722}
5723
Felix Jiad35a00b2017-01-26 16:59:17 +13005724static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5725 void __user *buffer, size_t *lenp,
5726 loff_t *ppos)
5727{
5728 int ret = 0;
5729 int new_val;
5730 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5731 struct net *net = (struct net *)ctl->extra2;
5732
Felix Jia8c171d62017-02-27 12:41:23 +13005733 if (!rtnl_trylock())
5734 return restart_syscall();
5735
Felix Jiad35a00b2017-01-26 16:59:17 +13005736 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5737
5738 if (write) {
5739 new_val = *((int *)ctl->data);
5740
Felix Jia8c171d62017-02-27 12:41:23 +13005741 if (check_addr_gen_mode(new_val) < 0) {
5742 ret = -EINVAL;
5743 goto out;
5744 }
Felix Jiad35a00b2017-01-26 16:59:17 +13005745
5746 /* request for default */
5747 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5748 ipv6_devconf_dflt.addr_gen_mode = new_val;
5749
5750 /* request for individual net device */
5751 } else {
5752 if (!idev)
Felix Jia8c171d62017-02-27 12:41:23 +13005753 goto out;
Felix Jiad35a00b2017-01-26 16:59:17 +13005754
Felix Jia8c171d62017-02-27 12:41:23 +13005755 if (check_stable_privacy(idev, net, new_val) < 0) {
5756 ret = -EINVAL;
5757 goto out;
5758 }
Felix Jiad35a00b2017-01-26 16:59:17 +13005759
5760 if (idev->cnf.addr_gen_mode != new_val) {
5761 idev->cnf.addr_gen_mode = new_val;
Felix Jiad35a00b2017-01-26 16:59:17 +13005762 addrconf_dev_config(idev->dev);
Felix Jiad35a00b2017-01-26 16:59:17 +13005763 }
5764 }
5765 }
5766
Felix Jia8c171d62017-02-27 12:41:23 +13005767out:
5768 rtnl_unlock();
5769
Felix Jiad35a00b2017-01-26 16:59:17 +13005770 return ret;
5771}
5772
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005773static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5774 void __user *buffer, size_t *lenp,
5775 loff_t *ppos)
5776{
5777 int err;
5778 struct in6_addr addr;
5779 char str[IPV6_MAX_STRLEN];
5780 struct ctl_table lctl = *ctl;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005781 struct net *net = ctl->extra2;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005782 struct ipv6_stable_secret *secret = ctl->data;
5783
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005784 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5785 return -EIO;
5786
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005787 lctl.maxlen = IPV6_MAX_STRLEN;
5788 lctl.data = str;
5789
5790 if (!rtnl_trylock())
5791 return restart_syscall();
5792
5793 if (!write && !secret->initialized) {
5794 err = -EIO;
5795 goto out;
5796 }
5797
WANG Cong5449a5c2015-12-21 10:55:45 -08005798 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5799 if (err >= sizeof(str)) {
5800 err = -EIO;
5801 goto out;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005802 }
5803
5804 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5805 if (err || !write)
5806 goto out;
5807
5808 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5809 err = -EIO;
5810 goto out;
5811 }
5812
5813 secret->initialized = true;
5814 secret->secret = addr;
5815
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005816 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5817 struct net_device *dev;
5818
5819 for_each_netdev(net, dev) {
5820 struct inet6_dev *idev = __in6_dev_get(dev);
5821
5822 if (idev) {
Felix Jiad35a00b2017-01-26 16:59:17 +13005823 idev->cnf.addr_gen_mode =
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005824 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5825 }
5826 }
5827 } else {
5828 struct inet6_dev *idev = ctl->extra1;
5829
Felix Jiad35a00b2017-01-26 16:59:17 +13005830 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005831 }
5832
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005833out:
5834 rtnl_unlock();
5835
5836 return err;
5837}
stephen hemmingerc92d5492013-12-17 22:37:14 -08005838
Andy Gospodarek35103d12015-08-13 10:39:01 -04005839static
5840int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5841 int write,
5842 void __user *buffer,
5843 size_t *lenp,
5844 loff_t *ppos)
5845{
5846 int *valp = ctl->data;
5847 int val = *valp;
5848 loff_t pos = *ppos;
5849 struct ctl_table lctl;
5850 int ret;
5851
5852 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5853 * we should not modify it until we get the rtnl lock.
5854 */
5855 lctl = *ctl;
5856 lctl.data = &val;
5857
5858 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5859
5860 if (write)
5861 ret = addrconf_fixup_linkdown(ctl, valp, val);
5862 if (ret)
5863 *ppos = pos;
5864 return ret;
5865}
5866
David Forsterdf789fe2017-02-23 16:27:18 +00005867static
5868void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5869{
5870 if (rt) {
5871 if (action)
5872 rt->dst.flags |= DST_NOPOLICY;
5873 else
5874 rt->dst.flags &= ~DST_NOPOLICY;
5875 }
5876}
5877
5878static
5879void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5880{
5881 struct inet6_ifaddr *ifa;
5882
5883 read_lock_bh(&idev->lock);
5884 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5885 spin_lock(&ifa->lock);
5886 if (ifa->rt) {
5887 struct rt6_info *rt = ifa->rt;
5888 struct fib6_table *table = rt->rt6i_table;
5889 int cpu;
5890
5891 read_lock(&table->tb6_lock);
5892 addrconf_set_nopolicy(ifa->rt, val);
5893 if (rt->rt6i_pcpu) {
5894 for_each_possible_cpu(cpu) {
5895 struct rt6_info **rtp;
5896
5897 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5898 addrconf_set_nopolicy(*rtp, val);
5899 }
5900 }
5901 read_unlock(&table->tb6_lock);
5902 }
5903 spin_unlock(&ifa->lock);
5904 }
5905 read_unlock_bh(&idev->lock);
5906}
5907
5908static
5909int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5910{
5911 struct inet6_dev *idev;
5912 struct net *net;
5913
5914 if (!rtnl_trylock())
5915 return restart_syscall();
5916
5917 *valp = val;
5918
5919 net = (struct net *)ctl->extra2;
5920 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5921 rtnl_unlock();
5922 return 0;
5923 }
5924
5925 if (valp == &net->ipv6.devconf_all->disable_policy) {
5926 struct net_device *dev;
5927
5928 for_each_netdev(net, dev) {
5929 idev = __in6_dev_get(dev);
5930 if (idev)
5931 addrconf_disable_policy_idev(idev, val);
5932 }
5933 } else {
5934 idev = (struct inet6_dev *)ctl->extra1;
5935 addrconf_disable_policy_idev(idev, val);
5936 }
5937
5938 rtnl_unlock();
5939 return 0;
5940}
5941
5942static
5943int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5944 void __user *buffer, size_t *lenp,
5945 loff_t *ppos)
5946{
5947 int *valp = ctl->data;
5948 int val = *valp;
5949 loff_t pos = *ppos;
5950 struct ctl_table lctl;
5951 int ret;
5952
5953 lctl = *ctl;
5954 lctl.data = &val;
5955 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5956
5957 if (write && (*valp != val))
5958 ret = addrconf_disable_policy(ctl, valp, val);
5959
5960 if (ret)
5961 *ppos = pos;
5962
5963 return ret;
5964}
5965
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07005966static int minus_one = -1;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005967static const int one = 1;
5968static const int two_five_five = 255;
5969
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03005970static const struct ctl_table addrconf_sysctl[] = {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005971 {
5972 .procname = "forwarding",
5973 .data = &ipv6_devconf.forwarding,
5974 .maxlen = sizeof(int),
5975 .mode = 0644,
5976 .proc_handler = addrconf_sysctl_forward,
5977 },
5978 {
5979 .procname = "hop_limit",
5980 .data = &ipv6_devconf.hop_limit,
5981 .maxlen = sizeof(int),
5982 .mode = 0644,
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005983 .proc_handler = proc_dointvec_minmax,
5984 .extra1 = (void *)&one,
5985 .extra2 = (void *)&two_five_five,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005986 },
5987 {
5988 .procname = "mtu",
5989 .data = &ipv6_devconf.mtu6,
5990 .maxlen = sizeof(int),
5991 .mode = 0644,
5992 .proc_handler = addrconf_sysctl_mtu,
5993 },
5994 {
5995 .procname = "accept_ra",
5996 .data = &ipv6_devconf.accept_ra,
5997 .maxlen = sizeof(int),
5998 .mode = 0644,
5999 .proc_handler = proc_dointvec,
6000 },
6001 {
6002 .procname = "accept_redirects",
6003 .data = &ipv6_devconf.accept_redirects,
6004 .maxlen = sizeof(int),
6005 .mode = 0644,
6006 .proc_handler = proc_dointvec,
6007 },
6008 {
6009 .procname = "autoconf",
6010 .data = &ipv6_devconf.autoconf,
6011 .maxlen = sizeof(int),
6012 .mode = 0644,
6013 .proc_handler = proc_dointvec,
6014 },
6015 {
6016 .procname = "dad_transmits",
6017 .data = &ipv6_devconf.dad_transmits,
6018 .maxlen = sizeof(int),
6019 .mode = 0644,
6020 .proc_handler = proc_dointvec,
6021 },
6022 {
6023 .procname = "router_solicitations",
6024 .data = &ipv6_devconf.rtr_solicits,
6025 .maxlen = sizeof(int),
6026 .mode = 0644,
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07006027 .proc_handler = proc_dointvec_minmax,
6028 .extra1 = &minus_one,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006029 },
6030 {
6031 .procname = "router_solicitation_interval",
6032 .data = &ipv6_devconf.rtr_solicit_interval,
6033 .maxlen = sizeof(int),
6034 .mode = 0644,
6035 .proc_handler = proc_dointvec_jiffies,
6036 },
6037 {
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07006038 .procname = "router_solicitation_max_interval",
6039 .data = &ipv6_devconf.rtr_solicit_max_interval,
6040 .maxlen = sizeof(int),
6041 .mode = 0644,
6042 .proc_handler = proc_dointvec_jiffies,
6043 },
6044 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006045 .procname = "router_solicitation_delay",
6046 .data = &ipv6_devconf.rtr_solicit_delay,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = proc_dointvec_jiffies,
6050 },
6051 {
6052 .procname = "force_mld_version",
6053 .data = &ipv6_devconf.force_mld_version,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec,
6057 },
6058 {
6059 .procname = "mldv1_unsolicited_report_interval",
6060 .data =
6061 &ipv6_devconf.mldv1_unsolicited_report_interval,
6062 .maxlen = sizeof(int),
6063 .mode = 0644,
6064 .proc_handler = proc_dointvec_ms_jiffies,
6065 },
6066 {
6067 .procname = "mldv2_unsolicited_report_interval",
6068 .data =
6069 &ipv6_devconf.mldv2_unsolicited_report_interval,
6070 .maxlen = sizeof(int),
6071 .mode = 0644,
6072 .proc_handler = proc_dointvec_ms_jiffies,
6073 },
6074 {
6075 .procname = "use_tempaddr",
6076 .data = &ipv6_devconf.use_tempaddr,
6077 .maxlen = sizeof(int),
6078 .mode = 0644,
6079 .proc_handler = proc_dointvec,
6080 },
6081 {
6082 .procname = "temp_valid_lft",
6083 .data = &ipv6_devconf.temp_valid_lft,
6084 .maxlen = sizeof(int),
6085 .mode = 0644,
6086 .proc_handler = proc_dointvec,
6087 },
6088 {
6089 .procname = "temp_prefered_lft",
6090 .data = &ipv6_devconf.temp_prefered_lft,
6091 .maxlen = sizeof(int),
6092 .mode = 0644,
6093 .proc_handler = proc_dointvec,
6094 },
6095 {
6096 .procname = "regen_max_retry",
6097 .data = &ipv6_devconf.regen_max_retry,
6098 .maxlen = sizeof(int),
6099 .mode = 0644,
6100 .proc_handler = proc_dointvec,
6101 },
6102 {
6103 .procname = "max_desync_factor",
6104 .data = &ipv6_devconf.max_desync_factor,
6105 .maxlen = sizeof(int),
6106 .mode = 0644,
6107 .proc_handler = proc_dointvec,
6108 },
6109 {
6110 .procname = "max_addresses",
6111 .data = &ipv6_devconf.max_addresses,
6112 .maxlen = sizeof(int),
6113 .mode = 0644,
6114 .proc_handler = proc_dointvec,
6115 },
6116 {
6117 .procname = "accept_ra_defrtr",
6118 .data = &ipv6_devconf.accept_ra_defrtr,
6119 .maxlen = sizeof(int),
6120 .mode = 0644,
6121 .proc_handler = proc_dointvec,
6122 },
6123 {
6124 .procname = "accept_ra_min_hop_limit",
6125 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6126 .maxlen = sizeof(int),
6127 .mode = 0644,
6128 .proc_handler = proc_dointvec,
6129 },
6130 {
6131 .procname = "accept_ra_pinfo",
6132 .data = &ipv6_devconf.accept_ra_pinfo,
6133 .maxlen = sizeof(int),
6134 .mode = 0644,
6135 .proc_handler = proc_dointvec,
6136 },
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08006137#ifdef CONFIG_IPV6_ROUTER_PREF
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006138 {
6139 .procname = "accept_ra_rtr_pref",
6140 .data = &ipv6_devconf.accept_ra_rtr_pref,
6141 .maxlen = sizeof(int),
6142 .mode = 0644,
6143 .proc_handler = proc_dointvec,
6144 },
6145 {
6146 .procname = "router_probe_interval",
6147 .data = &ipv6_devconf.rtr_probe_interval,
6148 .maxlen = sizeof(int),
6149 .mode = 0644,
6150 .proc_handler = proc_dointvec_jiffies,
6151 },
Neil Hormanfa03ef32007-01-30 14:30:10 -08006152#ifdef CONFIG_IPV6_ROUTE_INFO
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006153 {
Joel Scherpelzbbea1242017-03-22 18:19:04 +09006154 .procname = "accept_ra_rt_info_min_plen",
6155 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6156 .maxlen = sizeof(int),
6157 .mode = 0644,
6158 .proc_handler = proc_dointvec,
6159 },
6160 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006161 .procname = "accept_ra_rt_info_max_plen",
6162 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6163 .maxlen = sizeof(int),
6164 .mode = 0644,
6165 .proc_handler = proc_dointvec,
6166 },
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08006167#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08006168#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006169 {
6170 .procname = "proxy_ndp",
6171 .data = &ipv6_devconf.proxy_ndp,
6172 .maxlen = sizeof(int),
6173 .mode = 0644,
6174 .proc_handler = addrconf_sysctl_proxy_ndp,
6175 },
6176 {
6177 .procname = "accept_source_route",
6178 .data = &ipv6_devconf.accept_source_route,
6179 .maxlen = sizeof(int),
6180 .mode = 0644,
6181 .proc_handler = proc_dointvec,
6182 },
Neil Horman95c385b2007-04-25 17:08:10 -07006183#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006184 {
6185 .procname = "optimistic_dad",
6186 .data = &ipv6_devconf.optimistic_dad,
6187 .maxlen = sizeof(int),
6188 .mode = 0644,
6189 .proc_handler = proc_dointvec,
6190 },
6191 {
6192 .procname = "use_optimistic",
6193 .data = &ipv6_devconf.use_optimistic,
6194 .maxlen = sizeof(int),
6195 .mode = 0644,
6196 .proc_handler = proc_dointvec,
6197 },
Neil Horman95c385b2007-04-25 17:08:10 -07006198#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09006199#ifdef CONFIG_IPV6_MROUTE
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006200 {
6201 .procname = "mc_forwarding",
6202 .data = &ipv6_devconf.mc_forwarding,
6203 .maxlen = sizeof(int),
6204 .mode = 0444,
6205 .proc_handler = proc_dointvec,
6206 },
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09006207#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006208 {
6209 .procname = "disable_ipv6",
6210 .data = &ipv6_devconf.disable_ipv6,
6211 .maxlen = sizeof(int),
6212 .mode = 0644,
6213 .proc_handler = addrconf_sysctl_disable,
6214 },
6215 {
6216 .procname = "accept_dad",
6217 .data = &ipv6_devconf.accept_dad,
6218 .maxlen = sizeof(int),
6219 .mode = 0644,
6220 .proc_handler = proc_dointvec,
6221 },
6222 {
6223 .procname = "force_tllao",
6224 .data = &ipv6_devconf.force_tllao,
6225 .maxlen = sizeof(int),
6226 .mode = 0644,
6227 .proc_handler = proc_dointvec
6228 },
6229 {
6230 .procname = "ndisc_notify",
6231 .data = &ipv6_devconf.ndisc_notify,
6232 .maxlen = sizeof(int),
6233 .mode = 0644,
6234 .proc_handler = proc_dointvec
6235 },
6236 {
6237 .procname = "suppress_frag_ndisc",
6238 .data = &ipv6_devconf.suppress_frag_ndisc,
6239 .maxlen = sizeof(int),
6240 .mode = 0644,
6241 .proc_handler = proc_dointvec
6242 },
6243 {
6244 .procname = "accept_ra_from_local",
6245 .data = &ipv6_devconf.accept_ra_from_local,
6246 .maxlen = sizeof(int),
6247 .mode = 0644,
6248 .proc_handler = proc_dointvec,
6249 },
6250 {
6251 .procname = "accept_ra_mtu",
6252 .data = &ipv6_devconf.accept_ra_mtu,
6253 .maxlen = sizeof(int),
6254 .mode = 0644,
6255 .proc_handler = proc_dointvec,
6256 },
6257 {
6258 .procname = "stable_secret",
6259 .data = &ipv6_devconf.stable_secret,
6260 .maxlen = IPV6_MAX_STRLEN,
6261 .mode = 0600,
6262 .proc_handler = addrconf_sysctl_stable_secret,
6263 },
6264 {
6265 .procname = "use_oif_addrs_only",
6266 .data = &ipv6_devconf.use_oif_addrs_only,
6267 .maxlen = sizeof(int),
6268 .mode = 0644,
6269 .proc_handler = proc_dointvec,
6270 },
6271 {
6272 .procname = "ignore_routes_with_linkdown",
6273 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6274 .maxlen = sizeof(int),
6275 .mode = 0644,
6276 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6277 },
6278 {
6279 .procname = "drop_unicast_in_l2_multicast",
6280 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6281 .maxlen = sizeof(int),
6282 .mode = 0644,
6283 .proc_handler = proc_dointvec,
6284 },
6285 {
6286 .procname = "drop_unsolicited_na",
6287 .data = &ipv6_devconf.drop_unsolicited_na,
6288 .maxlen = sizeof(int),
6289 .mode = 0644,
6290 .proc_handler = proc_dointvec,
6291 },
6292 {
6293 .procname = "keep_addr_on_down",
6294 .data = &ipv6_devconf.keep_addr_on_down,
6295 .maxlen = sizeof(int),
6296 .mode = 0644,
6297 .proc_handler = proc_dointvec,
David Ahernf1705ec2016-02-24 09:25:37 -08006298
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006299 },
6300 {
David Lebrun1ababeb2016-11-08 14:57:39 +01006301 .procname = "seg6_enabled",
6302 .data = &ipv6_devconf.seg6_enabled,
6303 .maxlen = sizeof(int),
6304 .mode = 0644,
6305 .proc_handler = proc_dointvec,
6306 },
David Lebrunbf355b82016-11-08 14:57:42 +01006307#ifdef CONFIG_IPV6_SEG6_HMAC
6308 {
6309 .procname = "seg6_require_hmac",
6310 .data = &ipv6_devconf.seg6_require_hmac,
6311 .maxlen = sizeof(int),
6312 .mode = 0644,
6313 .proc_handler = proc_dointvec,
6314 },
6315#endif
David Lebrun1ababeb2016-11-08 14:57:39 +01006316 {
Erik Nordmarkadc176c2016-12-02 14:00:08 -08006317 .procname = "enhanced_dad",
6318 .data = &ipv6_devconf.enhanced_dad,
6319 .maxlen = sizeof(int),
6320 .mode = 0644,
6321 .proc_handler = proc_dointvec,
6322 },
6323 {
Felix Jiad35a00b2017-01-26 16:59:17 +13006324 .procname = "addr_gen_mode",
6325 .data = &ipv6_devconf.addr_gen_mode,
6326 .maxlen = sizeof(int),
6327 .mode = 0644,
6328 .proc_handler = addrconf_sysctl_addr_gen_mode,
6329 },
6330 {
David Forsterdf789fe2017-02-23 16:27:18 +00006331 .procname = "disable_policy",
6332 .data = &ipv6_devconf.disable_policy,
6333 .maxlen = sizeof(int),
6334 .mode = 0644,
6335 .proc_handler = addrconf_sysctl_disable_policy,
6336 },
6337 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006338 /* sentinel */
6339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006340};
6341
Pavel Emelyanovbff16c22008-01-10 17:42:13 -08006342static int __addrconf_sysctl_register(struct net *net, char *dev_name,
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006343 struct inet6_dev *idev, struct ipv6_devconf *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006344{
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006345 int i, ifindex;
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006346 struct ctl_table *table;
Eric W. Biederman6105e292012-04-19 13:41:24 +00006347 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
Pavel Emelyanov1dab6222007-12-02 00:59:38 +11006348
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006349 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6350 if (!table)
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006351 goto out;
6352
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006353 for (i = 0; table[i].data; i++) {
6354 table[i].data += (char *)p - (char *)&ipv6_devconf;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07006355 /* If one of these is already set, then it is not safe to
6356 * overwrite either of them: this makes proc_dointvec_minmax
6357 * usable.
6358 */
6359 if (!table[i].extra1 && !table[i].extra2) {
6360 table[i].extra1 = idev; /* embedded; no ref */
6361 table[i].extra2 = net;
6362 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006364
Eric W. Biederman6105e292012-04-19 13:41:24 +00006365 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006366
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006367 p->sysctl_header = register_net_sysctl(net, path, table);
6368 if (!p->sysctl_header)
Eric W. Biederman6105e292012-04-19 13:41:24 +00006369 goto free;
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006370
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006371 if (!strcmp(dev_name, "all"))
6372 ifindex = NETCONFA_IFINDEX_ALL;
6373 else if (!strcmp(dev_name, "default"))
6374 ifindex = NETCONFA_IFINDEX_DEFAULT;
6375 else
6376 ifindex = idev->dev->ifindex;
David Ahern85b3daa2017-03-28 14:28:04 -07006377 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6378 ifindex, p);
Pavel Emelyanov95897312008-01-10 17:41:45 -08006379 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006380
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006381free:
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006382 kfree(table);
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006383out:
Pavel Emelyanov95897312008-01-10 17:41:45 -08006384 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006385}
6386
David Ahern23452172017-03-28 14:28:05 -07006387static void __addrconf_sysctl_unregister(struct net *net,
6388 struct ipv6_devconf *p, int ifindex)
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006389{
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006390 struct ctl_table *table;
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006391
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006392 if (!p->sysctl_header)
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006393 return;
6394
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006395 table = p->sysctl_header->ctl_table_arg;
6396 unregister_net_sysctl_table(p->sysctl_header);
6397 p->sysctl_header = NULL;
6398 kfree(table);
David Ahern23452172017-03-28 14:28:05 -07006399
6400 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006401}
6402
WANG Conga317a2f2014-07-25 15:25:09 -07006403static int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006404{
WANG Conga317a2f2014-07-25 15:25:09 -07006405 int err;
6406
6407 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6408 return -EINVAL;
6409
6410 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6411 &ndisc_ifinfo_sysctl_change);
6412 if (err)
6413 return err;
6414 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6415 idev, &idev->cnf);
6416 if (err)
6417 neigh_sysctl_unregister(idev->nd_parms);
6418
6419 return err;
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006420}
6421
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006422static void addrconf_sysctl_unregister(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006423{
David Ahern23452172017-03-28 14:28:05 -07006424 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6425 idev->dev->ifindex);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006426 neigh_sysctl_unregister(idev->nd_parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006427}
6428
6429
6430#endif
6431
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006432static int __net_init addrconf_init_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006433{
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006434 int err = -ENOMEM;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006435 struct ipv6_devconf *all, *dflt;
6436
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006437 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006438 if (!all)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006439 goto err_alloc_all;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006440
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006441 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006442 if (!dflt)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006443 goto err_alloc_dflt;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006444
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006445 /* these will be inherited by all namespaces */
6446 dflt->autoconf = ipv6_defaults.autoconf;
6447 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006448
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01006449 dflt->stable_secret.initialized = false;
6450 all->stable_secret.initialized = false;
6451
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006452 net->ipv6.devconf_all = all;
6453 net->ipv6.devconf_dflt = dflt;
6454
6455#ifdef CONFIG_SYSCTL
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006456 err = __addrconf_sysctl_register(net, "all", NULL, all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006457 if (err < 0)
6458 goto err_reg_all;
6459
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006460 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006461 if (err < 0)
6462 goto err_reg_dflt;
6463#endif
6464 return 0;
6465
6466#ifdef CONFIG_SYSCTL
6467err_reg_dflt:
David Ahern23452172017-03-28 14:28:05 -07006468 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006469err_reg_all:
6470 kfree(dflt);
6471#endif
6472err_alloc_dflt:
6473 kfree(all);
6474err_alloc_all:
6475 return err;
6476}
6477
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006478static void __net_exit addrconf_exit_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006479{
6480#ifdef CONFIG_SYSCTL
David Ahern23452172017-03-28 14:28:05 -07006481 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6482 NETCONFA_IFINDEX_DEFAULT);
6483 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6484 NETCONFA_IFINDEX_ALL);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006485#endif
zhuyj73cf0e922014-11-26 10:25:58 +08006486 kfree(net->ipv6.devconf_dflt);
6487 kfree(net->ipv6.devconf_all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006488}
6489
6490static struct pernet_operations addrconf_ops = {
6491 .init = addrconf_init_net,
6492 .exit = addrconf_exit_net,
6493};
6494
Daniel Borkmann207895f2015-01-29 12:15:03 +01006495static struct rtnl_af_ops inet6_ops __read_mostly = {
Thomas Grafb382b192010-11-16 04:33:57 +00006496 .family = AF_INET6,
6497 .fill_link_af = inet6_fill_link_af,
6498 .get_link_af_size = inet6_get_link_af_size,
Daniel Borkmann11b1f822015-02-05 14:39:11 +01006499 .validate_link_af = inet6_validate_link_af,
Daniel Borkmannf53adae2013-04-08 04:01:30 +00006500 .set_link_af = inet6_set_link_af,
Thomas Grafb382b192010-11-16 04:33:57 +00006501};
6502
Linus Torvalds1da177e2005-04-16 15:20:36 -07006503/*
6504 * Init / cleanup code
6505 */
6506
6507int __init addrconf_init(void)
6508{
WANG Conga317a2f2014-07-25 15:25:09 -07006509 struct inet6_dev *idev;
stephen hemmingerc2e21292010-03-17 20:31:10 +00006510 int i, err;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006511
Stephen Hemmingere21e8462010-03-20 16:09:01 -07006512 err = ipv6_addr_label_init();
6513 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00006514 pr_crit("%s: cannot initialize default policy table: %d\n",
6515 __func__, err);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006516 goto out;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006517 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006518
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006519 err = register_pernet_subsys(&addrconf_ops);
6520 if (err < 0)
6521 goto out_addrlabel;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006522
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006523 addrconf_wq = create_workqueue("ipv6_addrconf");
6524 if (!addrconf_wq) {
6525 err = -ENOMEM;
6526 goto out_nowq;
6527 }
6528
Linus Torvalds1da177e2005-04-16 15:20:36 -07006529 /* The addrconf netdev notifier requires that loopback_dev
6530 * has it's ipv6 private information allocated and setup
6531 * before it can bring up and give link-local addresses
6532 * to other devices which are up.
6533 *
6534 * Unfortunately, loopback_dev is not necessarily the first
6535 * entry in the global dev_base list of net devices. In fact,
6536 * it is likely to be the very last entry on that list.
6537 * So this causes the notifier registry below to try and
6538 * give link-local addresses to all devices besides loopback_dev
6539 * first, then loopback_dev, which cases all the non-loopback_dev
6540 * devices to fail to get a link-local address.
6541 *
6542 * So, as a temporary fix, allocate the ipv6 structure for
6543 * loopback_dev first by hand.
6544 * Longer term, all of the dependencies ipv6 has upon the loopback
6545 * device and it being up should be removed.
6546 */
6547 rtnl_lock();
WANG Conga317a2f2014-07-25 15:25:09 -07006548 idev = ipv6_add_dev(init_net.loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006549 rtnl_unlock();
WANG Conga317a2f2014-07-25 15:25:09 -07006550 if (IS_ERR(idev)) {
6551 err = PTR_ERR(idev);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006552 goto errlo;
WANG Conga317a2f2014-07-25 15:25:09 -07006553 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006554
WANG Cong2f460932017-05-03 22:07:31 -07006555 ip6_route_init_special_entries();
6556
stephen hemmingerc2e21292010-03-17 20:31:10 +00006557 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6558 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6559
Linus Torvalds1da177e2005-04-16 15:20:36 -07006560 register_netdevice_notifier(&ipv6_dev_notf);
6561
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006562 addrconf_verify();
Thomas Grafc127ea22007-03-22 11:58:32 -07006563
stephen hemminger3678a9d2013-12-30 10:41:32 -08006564 rtnl_af_register(&inet6_ops);
Thomas Grafb382b192010-11-16 04:33:57 +00006565
Greg Rosec7ac8672011-06-10 01:27:09 +00006566 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
Florian Westphalb97bac62017-08-09 20:41:48 +02006567 0);
Thomas Grafc127ea22007-03-22 11:58:32 -07006568 if (err < 0)
6569 goto errout;
6570
6571 /* Only the first call to __rtnl_register can fail */
Florian Westphalb97bac62017-08-09 20:41:48 +02006572 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6573 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
Greg Rosec7ac8672011-06-10 01:27:09 +00006574 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
Florian Westphalb97bac62017-08-09 20:41:48 +02006575 inet6_dump_ifaddr, 0);
Greg Rosec7ac8672011-06-10 01:27:09 +00006576 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
Florian Westphalb97bac62017-08-09 20:41:48 +02006577 inet6_dump_ifmcaddr, 0);
Greg Rosec7ac8672011-06-10 01:27:09 +00006578 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
Florian Westphalb97bac62017-08-09 20:41:48 +02006579 inet6_dump_ifacaddr, 0);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +00006580 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
Florian Westphalb97bac62017-08-09 20:41:48 +02006581 inet6_netconf_dump_devconf, 0);
Thomas Grafc127ea22007-03-22 11:58:32 -07006582
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006583 ipv6_addr_label_rtnl_register();
6584
Linus Torvalds1da177e2005-04-16 15:20:36 -07006585 return 0;
Thomas Grafc127ea22007-03-22 11:58:32 -07006586errout:
Thomas Grafb382b192010-11-16 04:33:57 +00006587 rtnl_af_unregister(&inet6_ops);
Thomas Grafc127ea22007-03-22 11:58:32 -07006588 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006589errlo:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006590 destroy_workqueue(addrconf_wq);
6591out_nowq:
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006592 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006593out_addrlabel:
6594 ipv6_addr_label_cleanup();
6595out:
Thomas Grafc127ea22007-03-22 11:58:32 -07006596 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006597}
6598
Daniel Lezcano09f77092007-12-13 05:34:58 -08006599void addrconf_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006600{
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006601 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006602 int i;
6603
6604 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006605 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006606 ipv6_addr_label_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006607
6608 rtnl_lock();
6609
Thomas Grafb382b192010-11-16 04:33:57 +00006610 __rtnl_af_unregister(&inet6_ops);
6611
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006612 /* clean dev list */
6613 for_each_netdev(&init_net, dev) {
6614 if (__in6_dev_get(dev) == NULL)
6615 continue;
6616 addrconf_ifdown(dev, 1);
6617 }
6618 addrconf_ifdown(init_net.loopback_dev, 2);
6619
Linus Torvalds1da177e2005-04-16 15:20:36 -07006620 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006621 * Check hash table.
6622 */
stephen hemminger5c578aed2010-03-17 20:31:11 +00006623 spin_lock_bh(&addrconf_hash_lock);
stephen hemmingerc2e21292010-03-17 20:31:10 +00006624 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6625 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
stephen hemminger5c578aed2010-03-17 20:31:11 +00006626 spin_unlock_bh(&addrconf_hash_lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006627 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006628 rtnl_unlock();
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006629
6630 destroy_workqueue(addrconf_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006631}