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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);
Eric Dumazetd9bf82c2017-10-07 19:30:24 -0700155static int ipv6_count_addresses(const 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
Mike Manning1f372c72017-09-25 22:01:36 +0100306/* Check if link is ready: is it up and is a valid qdisc available */
307static inline bool addrconf_link_ready(const struct net_device *dev)
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700308{
Mike Manning1f372c72017-09-25 22:01:36 +0100309 return netif_oper_up(dev) && !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
Mike Manning1f372c72017-09-25 22:01:36 +0100454 if (netif_running(dev) && addrconf_link_ready(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];
Florian Westphal4ea26072017-10-11 10:28:00 +0200619 struct inet6_dev *in6_dev = NULL;
620 struct net_device *dev = NULL;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000621 struct netconfmsg *ncm;
622 struct sk_buff *skb;
623 struct ipv6_devconf *devconf;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000624 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)
Florian Westphal4ea26072017-10-11 10:28:00 +0200630 return err;
631
632 if (!tb[NETCONFA_IFINDEX])
633 return -EINVAL;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000634
Anton Protopopova97eb332016-02-16 21:43:16 -0500635 err = -EINVAL;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000636 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:
Florian Westphal4ea26072017-10-11 10:28:00 +0200645 dev = dev_get_by_index(net, ifindex);
Ian Morris63159f22015-03-29 14:00:04 +0100646 if (!dev)
Florian Westphal4ea26072017-10-11 10:28:00 +0200647 return -EINVAL;
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;
Florian Westphal4ea26072017-10-11 10:28:00 +0200656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
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:
Florian Westphal4ea26072017-10-11 10:28:00 +0200672 if (in6_dev)
673 in6_dev_put(in6_dev);
674 if (dev)
675 dev_put(dev);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000676 return err;
677}
678
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000679static int inet6_netconf_dump_devconf(struct sk_buff *skb,
680 struct netlink_callback *cb)
681{
682 struct net *net = sock_net(skb->sk);
683 int h, s_h;
684 int idx, s_idx;
685 struct net_device *dev;
686 struct inet6_dev *idev;
687 struct hlist_head *head;
688
689 s_h = cb->args[0];
690 s_idx = idx = cb->args[1];
691
692 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
693 idx = 0;
694 head = &net->dev_index_head[h];
695 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000696 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
697 net->dev_base_seq;
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000698 hlist_for_each_entry_rcu(dev, head, index_hlist) {
699 if (idx < s_idx)
700 goto cont;
701 idev = __in6_dev_get(dev);
702 if (!idev)
703 goto cont;
704
705 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
706 &idev->cnf,
707 NETLINK_CB(cb->skb).portid,
708 cb->nlh->nlmsg_seq,
709 RTM_NEWNETCONF,
710 NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000711 NETCONFA_ALL) < 0) {
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000712 rcu_read_unlock();
713 goto done;
714 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000715 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000716cont:
717 idx++;
718 }
719 rcu_read_unlock();
720 }
721 if (h == NETDEV_HASHENTRIES) {
722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
723 net->ipv6.devconf_all,
724 NETLINK_CB(cb->skb).portid,
725 cb->nlh->nlmsg_seq,
726 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000727 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000728 goto done;
729 else
730 h++;
731 }
732 if (h == NETDEV_HASHENTRIES + 1) {
733 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
734 net->ipv6.devconf_dflt,
735 NETLINK_CB(cb->skb).portid,
736 cb->nlh->nlmsg_seq,
737 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000738 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000739 goto done;
740 else
741 h++;
742 }
743done:
744 cb->args[0] = h;
745 cb->args[1] = idx;
746
747 return skb->len;
748}
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750#ifdef CONFIG_SYSCTL
751static void dev_forward_change(struct inet6_dev *idev)
752{
753 struct net_device *dev;
754 struct inet6_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
756 if (!idev)
757 return;
758 dev = idev->dev;
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700759 if (idev->cnf.forwarding)
760 dev_disable_lro(dev);
Amerigo Wang1a940832012-10-28 17:43:53 +0000761 if (dev->flags & IFF_MULTICAST) {
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000762 if (idev->cnf.forwarding) {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900763 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000764 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
765 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
766 } else {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900767 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000768 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
769 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
770 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 }
stephen hemminger502a2ff2010-03-17 20:31:13 +0000772
773 list_for_each_entry(ifa, &idev->addr_list, if_list) {
Michal Wrobel2c12a742007-02-26 15:36:10 -0800774 if (ifa->flags&IFA_F_TENTATIVE)
775 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 if (idev->cnf.forwarding)
777 addrconf_join_anycast(ifa);
778 else
779 addrconf_leave_anycast(ifa);
780 }
David Ahern85b3daa2017-03-28 14:28:04 -0700781 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
782 NETCONFA_FORWARDING,
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000783 dev->ifindex, &idev->cnf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784}
785
786
Pavel Emelyanove1869322008-01-10 17:43:50 -0800787static void addrconf_forward_change(struct net *net, __s32 newf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788{
789 struct net_device *dev;
790 struct inet6_dev *idev;
791
Ben Hutchings4acd4942012-08-14 08:54:51 +0000792 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 idev = __in6_dev_get(dev);
794 if (idev) {
Pavel Emelyanove1869322008-01-10 17:43:50 -0800795 int changed = (!idev->cnf.forwarding) ^ (!newf);
796 idev->cnf.forwarding = newf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (changed)
798 dev_forward_change(idev);
799 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801}
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800802
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000803static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800804{
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800805 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000806 int old;
807
808 if (!rtnl_trylock())
809 return restart_syscall();
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800810
811 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000812 old = *p;
813 *p = newf;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800814
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000815 if (p == &net->ipv6.devconf_dflt->forwarding) {
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000816 if ((!newf) ^ (!old))
David Ahern85b3daa2017-03-28 14:28:04 -0700817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
818 NETCONFA_FORWARDING,
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000821 rtnl_unlock();
822 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +0000823 }
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000824
Pavel Emelyanove1869322008-01-10 17:43:50 -0800825 if (p == &net->ipv6.devconf_all->forwarding) {
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200826 int old_dflt = net->ipv6.devconf_dflt->forwarding;
827
Pavel Emelyanove1869322008-01-10 17:43:50 -0800828 net->ipv6.devconf_dflt->forwarding = newf;
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200829 if ((!newf) ^ (!old_dflt))
David Ahern85b3daa2017-03-28 14:28:04 -0700830 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
831 NETCONFA_FORWARDING,
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200832 NETCONFA_IFINDEX_DEFAULT,
833 net->ipv6.devconf_dflt);
834
Pavel Emelyanove1869322008-01-10 17:43:50 -0800835 addrconf_forward_change(net, newf);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000836 if ((!newf) ^ (!old))
David Ahern85b3daa2017-03-28 14:28:04 -0700837 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
838 NETCONFA_FORWARDING,
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000839 NETCONFA_IFINDEX_ALL,
840 net->ipv6.devconf_all);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000841 } else if ((!newf) ^ (!old))
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800842 dev_forward_change((struct inet6_dev *)table->extra1);
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700843 rtnl_unlock();
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800844
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000845 if (newf)
Daniel Lezcano7b4da532008-03-04 13:47:14 -0800846 rt6_purge_dflt_routers(net);
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000847 return 1;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800848}
Andy Gospodarek35103d12015-08-13 10:39:01 -0400849
850static void addrconf_linkdown_change(struct net *net, __s32 newf)
851{
852 struct net_device *dev;
853 struct inet6_dev *idev;
854
855 for_each_netdev(net, dev) {
856 idev = __in6_dev_get(dev);
857 if (idev) {
858 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
859
860 idev->cnf.ignore_routes_with_linkdown = newf;
861 if (changed)
862 inet6_netconf_notify_devconf(dev_net(dev),
David Ahern85b3daa2017-03-28 14:28:04 -0700863 RTM_NEWNETCONF,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400864 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
865 dev->ifindex,
866 &idev->cnf);
867 }
868 }
869}
870
871static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
872{
873 struct net *net;
874 int old;
875
876 if (!rtnl_trylock())
877 return restart_syscall();
878
879 net = (struct net *)table->extra2;
880 old = *p;
881 *p = newf;
882
883 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
884 if ((!newf) ^ (!old))
885 inet6_netconf_notify_devconf(net,
David Ahern85b3daa2017-03-28 14:28:04 -0700886 RTM_NEWNETCONF,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
888 NETCONFA_IFINDEX_DEFAULT,
889 net->ipv6.devconf_dflt);
890 rtnl_unlock();
891 return 0;
892 }
893
894 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
895 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
896 addrconf_linkdown_change(net, newf);
897 if ((!newf) ^ (!old))
898 inet6_netconf_notify_devconf(net,
David Ahern85b3daa2017-03-28 14:28:04 -0700899 RTM_NEWNETCONF,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400900 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
901 NETCONFA_IFINDEX_ALL,
902 net->ipv6.devconf_all);
903 }
904 rtnl_unlock();
905
906 return 1;
907}
908
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909#endif
910
stephen hemminger5c578aed2010-03-17 20:31:11 +0000911/* Nobody refers to this ifaddr, destroy it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
913{
stephen hemmingerc2e21292010-03-17 20:31:10 +0000914 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700915
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916#ifdef NET_REFCNT_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +0000917 pr_debug("%s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918#endif
919
920 in6_dev_put(ifp->idev);
921
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100922 if (cancel_delayed_work(&ifp->dad_work))
923 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
924 ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
Herbert Xue9d3e082010-05-18 15:36:06 -0700926 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
Joe Perchesf3213832012-05-15 14:11:53 +0000927 pr_warn("Freeing alive inet6 address %p\n", ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 return;
929 }
Amerigo Wang94e187c2012-10-29 00:13:19 +0000930 ip6_rt_put(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
Lai Jiangshane5785982011-03-15 18:00:14 +0800932 kfree_rcu(ifp, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933}
934
Brian Haleye55ffac2006-07-10 15:25:51 -0700935static void
936ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
937{
stephen hemminger502a2ff2010-03-17 20:31:13 +0000938 struct list_head *p;
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700939 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
Brian Haleye55ffac2006-07-10 15:25:51 -0700940
941 /*
942 * Each device address list is sorted in order of scope -
943 * global before linklocal.
944 */
stephen hemminger502a2ff2010-03-17 20:31:13 +0000945 list_for_each(p, &idev->addr_list) {
946 struct inet6_ifaddr *ifa
947 = list_entry(p, struct inet6_ifaddr, if_list);
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700948 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
Brian Haleye55ffac2006-07-10 15:25:51 -0700949 break;
950 }
951
Eric Dumazet8ef802a2017-10-07 19:30:23 -0700952 list_add_tail_rcu(&ifp->if_list, p);
Brian Haleye55ffac2006-07-10 15:25:51 -0700953}
954
Eric Dumazetddbe5032012-07-18 08:11:12 +0000955static u32 inet6_addr_hash(const struct in6_addr *addr)
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900956{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000957 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900958}
959
David Ahernf3d98322017-10-18 09:56:52 -0700960static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
961{
962 unsigned int hash;
963 int err = 0;
964
965 spin_lock(&addrconf_hash_lock);
966
967 /* Ignore adding duplicate addresses on an interface */
968 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev)) {
969 ADBG("ipv6_add_addr: already assigned\n");
970 err = -EEXIST;
971 goto out;
972 }
973
974 /* Add to big hash table */
975 hash = inet6_addr_hash(&ifa->addr);
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
977
978out:
979 spin_unlock(&addrconf_hash_lock);
980
981 return err;
982}
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984/* On success it returns ifp with increased reference count */
985
986static struct inet6_ifaddr *
Jiri Pirko3f8f5292013-08-01 10:41:27 +0200987ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
988 const struct in6_addr *peer_addr, int pfxlen,
David Ahernf3d98322017-10-18 09:56:52 -0700989 int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
990 bool can_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
David Ahernf3d98322017-10-18 09:56:52 -0700992 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
David Forsterdf789fe2017-02-23 16:27:18 +0000993 struct net *net = dev_net(idev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 struct inet6_ifaddr *ifa = NULL;
David Ahernf3d98322017-10-18 09:56:52 -0700995 struct rt6_info *rt = NULL;
Krister Johansen3ad7d242017-06-08 13:12:14 -0700996 struct in6_validator_info i6vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 int err = 0;
YOSHIFUJI Hideakid68b8272008-06-25 16:26:47 +0900998 int addr_type = ipv6_addr_type(addr);
999
1000 if (addr_type == IPV6_ADDR_ANY ||
1001 addr_type & IPV6_ADDR_MULTICAST ||
1002 (!(idev->dev->flags & IFF_LOOPBACK) &&
1003 addr_type & IPV6_ADDR_LOOPBACK))
1004 return ERR_PTR(-EADDRNOTAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 if (idev->dead) {
1007 err = -ENODEV; /*XXX*/
David Ahernf3d98322017-10-18 09:56:52 -07001008 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 }
1010
Brian Haley56d417b2009-06-01 03:07:33 -07001011 if (idev->cnf.disable_ipv6) {
Brian Haley9bdd8d42009-03-18 18:22:48 -07001012 err = -EACCES;
David Ahernf3d98322017-10-18 09:56:52 -07001013 goto out;
Brian Haley9bdd8d42009-03-18 18:22:48 -07001014 }
1015
Krister Johansen3ad7d242017-06-08 13:12:14 -07001016 i6vi.i6vi_addr = *addr;
1017 i6vi.i6vi_dev = idev;
Krister Johansen3ad7d242017-06-08 13:12:14 -07001018 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
Krister Johansen3ad7d242017-06-08 13:12:14 -07001019 err = notifier_to_errno(err);
David Ahernf3d98322017-10-18 09:56:52 -07001020 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
David Ahernf3d98322017-10-18 09:56:52 -07001023 ifa = kzalloc(sizeof(*ifa), gfp_flags);
Ian Morris63159f22015-03-29 14:00:04 +01001024 if (!ifa) {
dingtianhongba3542e2013-08-17 10:27:04 +08001025 ADBG("ipv6_add_addr: malloc failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 err = -ENOBUFS;
1027 goto out;
1028 }
1029
David S. Miller8f031512011-12-06 16:48:14 -05001030 rt = addrconf_dst_alloc(idev, addr, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 if (IS_ERR(rt)) {
1032 err = PTR_ERR(rt);
David Ahernf3d98322017-10-18 09:56:52 -07001033 rt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 goto out;
1035 }
1036
David Forsterdf789fe2017-02-23 16:27:18 +00001037 if (net->ipv6.devconf_all->disable_policy ||
1038 idev->cnf.disable_policy)
1039 rt->dst.flags |= DST_NOPOLICY;
1040
Jiri Pirkobba24892013-12-07 19:26:57 +01001041 neigh_parms_data_state_setall(idev->nd_parms);
1042
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001043 ifa->addr = *addr;
Jiri Pirko3f8f5292013-08-01 10:41:27 +02001044 if (peer_addr)
1045 ifa->peer_addr = *peer_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047 spin_lock_init(&ifa->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001048 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
stephen hemmingerc2e21292010-03-17 20:31:10 +00001049 INIT_HLIST_NODE(&ifa->addr_lst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 ifa->scope = scope;
1051 ifa->prefix_len = pfxlen;
Mahesh Bandewar66eb9f82017-05-12 17:03:39 -07001052 ifa->flags = flags;
1053 /* No need to add the TENTATIVE flag for addresses with NODAD */
1054 if (!(flags & IFA_F_NODAD))
1055 ifa->flags |= IFA_F_TENTATIVE;
Jiri Benc8a226b22013-08-01 10:41:28 +02001056 ifa->valid_lft = valid_lft;
1057 ifa->prefered_lft = prefered_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 ifa->cstamp = ifa->tstamp = jiffies;
Daniel Borkmann617fe292013-04-09 03:47:16 +00001059 ifa->tokenized = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060
Keir Fraser57f5f542006-08-29 02:43:49 -07001061 ifa->rt = rt;
1062
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 ifa->idev = idev;
David Ahernf3d98322017-10-18 09:56:52 -07001064 in6_dev_hold(idev);
1065
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 /* For caller */
Reshetova, Elena271201c2017-07-04 09:34:56 +03001067 refcount_set(&ifa->refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
David Ahernf3d98322017-10-18 09:56:52 -07001069 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
David Ahernf3d98322017-10-18 09:56:52 -07001071 err = ipv6_add_addr_hash(idev->dev, ifa);
1072 if (err < 0) {
1073 rcu_read_unlock_bh();
1074 goto out;
1075 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
1077 write_lock(&idev->lock);
David Ahernf3d98322017-10-18 09:56:52 -07001078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 /* Add to inet6_dev unicast addr list. */
Brian Haleye55ffac2006-07-10 15:25:51 -07001080 ipv6_link_dev_addr(idev, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 if (ifa->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001083 list_add(&ifa->tmp_list, &idev->tempaddr_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 in6_ifa_hold(ifa);
1085 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 in6_ifa_hold(ifa);
1088 write_unlock(&idev->lock);
David Ahernf3d98322017-10-18 09:56:52 -07001089
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001090 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
David Ahernf3d98322017-10-18 09:56:52 -07001092 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1093out:
1094 if (unlikely(err < 0)) {
1095 if (rt)
1096 ip6_rt_put(rt);
1097 if (ifa) {
1098 if (ifa->idev)
1099 in6_dev_put(ifa->idev);
1100 kfree(ifa);
1101 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 ifa = ERR_PTR(err);
1103 }
1104
1105 return ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107
Thomas Haller5b84efe2014-01-15 15:36:59 +01001108enum cleanup_prefix_rt_t {
1109 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1110 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1111 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1112};
1113
1114/*
1115 * Check, whether the prefix for ifp would still need a prefix route
1116 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1117 * constants.
1118 *
1119 * 1) we don't purge prefix if address was not permanent.
1120 * prefix is managed by its own lifetime.
1121 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1122 * 3) if there are no addresses, delete prefix.
1123 * 4) if there are still other permanent address(es),
1124 * corresponding prefix is still permanent.
1125 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1126 * don't purge the prefix, assume user space is managing it.
1127 * 6) otherwise, update prefix lifetime to the
1128 * longest valid lifetime among the corresponding
1129 * addresses on the device.
1130 * Note: subsequent RA will update lifetime.
1131 **/
1132static enum cleanup_prefix_rt_t
1133check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1134{
1135 struct inet6_ifaddr *ifa;
1136 struct inet6_dev *idev = ifp->idev;
1137 unsigned long lifetime;
1138 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1139
1140 *expires = jiffies;
1141
1142 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1143 if (ifa == ifp)
1144 continue;
1145 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1146 ifp->prefix_len))
1147 continue;
1148 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1149 return CLEANUP_PREFIX_RT_NOP;
1150
1151 action = CLEANUP_PREFIX_RT_EXPIRE;
1152
1153 spin_lock(&ifa->lock);
1154
1155 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1156 /*
1157 * Note: Because this address is
1158 * not permanent, lifetime <
1159 * LONG_MAX / HZ here.
1160 */
1161 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1162 *expires = ifa->tstamp + lifetime * HZ;
1163 spin_unlock(&ifa->lock);
1164 }
1165
1166 return action;
1167}
1168
1169static void
1170cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1171{
1172 struct rt6_info *rt;
1173
1174 rt = addrconf_get_prefix_route(&ifp->addr,
1175 ifp->prefix_len,
1176 ifp->idev->dev,
1177 0, RTF_GATEWAY | RTF_DEFAULT);
1178 if (rt) {
1179 if (del_rt)
1180 ip6_del_rt(rt);
1181 else {
1182 if (!(rt->rt6i_flags & RTF_EXPIRES))
1183 rt6_set_expires(rt, expires);
1184 ip6_rt_put(rt);
1185 }
1186 }
1187}
1188
1189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190/* This function wants to get referenced ifp and releases it before return */
1191
1192static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1193{
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001194 int state;
Thomas Haller5b84efe2014-01-15 15:36:59 +01001195 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1196 unsigned long expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001198 ASSERT_RTNL();
1199
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001200 spin_lock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001201 state = ifp->state;
Herbert Xue9d3e082010-05-18 15:36:06 -07001202 ifp->state = INET6_IFADDR_STATE_DEAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001203 spin_unlock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001204
1205 if (state == INET6_IFADDR_STATE_DEAD)
1206 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
stephen hemminger5c578aed2010-03-17 20:31:11 +00001208 spin_lock_bh(&addrconf_hash_lock);
1209 hlist_del_init_rcu(&ifp->addr_lst);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001210 spin_unlock_bh(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Thomas Haller5b84efe2014-01-15 15:36:59 +01001212 write_lock_bh(&ifp->idev->lock);
David S. Miller5d9efa72013-10-28 20:07:50 -04001213
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 if (ifp->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001215 list_del(&ifp->tmp_list);
1216 if (ifp->ifpub) {
1217 in6_ifa_put(ifp->ifpub);
1218 ifp->ifpub = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 }
stephen hemminger372e6c82010-03-17 20:31:09 +00001220 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222
Thomas Haller5b84efe2014-01-15 15:36:59 +01001223 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1224 action = check_cleanup_prefix_route(ifp, &expires);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001225
Eric Dumazet8ef802a2017-10-07 19:30:23 -07001226 list_del_rcu(&ifp->if_list);
Thomas Haller5b84efe2014-01-15 15:36:59 +01001227 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
Thomas Haller5b84efe2014-01-15 15:36:59 +01001229 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001231 addrconf_del_dad_work(ifp);
Andrey Vaginb2238562008-07-08 15:13:31 -07001232
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 ipv6_ifa_notify(RTM_DELADDR, ifp);
1234
Cong Wangf88c91d2013-04-14 23:18:43 +08001235 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
Thomas Haller5b84efe2014-01-15 15:36:59 +01001237 if (action != CLEANUP_PREFIX_RT_NOP) {
1238 cleanup_prefix_route(ifp, expires,
1239 action == CLEANUP_PREFIX_RT_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 }
1241
Daniel Walterc3968a82011-04-13 21:10:57 +00001242 /* clean up prefsrc entries */
1243 rt6_remove_prefsrc(ifp);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001244out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 in6_ifa_put(ifp);
1246}
1247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1249{
1250 struct inet6_dev *idev = ifp->idev;
1251 struct in6_addr addr, *tmpaddr;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001252 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001253 unsigned long regen_advance;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 int tmp_plen;
1255 int ret = 0;
Neil Horman95c385b2007-04-25 17:08:10 -07001256 u32 addr_flags;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001257 unsigned long now = jiffies;
Jiri Bohac76506a92016-10-13 18:52:15 +02001258 long max_desync_factor;
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001259 s32 cnf_temp_preferred_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
Jiri Pirko53bd6742013-12-06 09:45:22 +01001261 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 if (ift) {
1263 spin_lock_bh(&ift->lock);
1264 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1265 spin_unlock_bh(&ift->lock);
1266 tmpaddr = &addr;
1267 } else {
1268 tmpaddr = NULL;
1269 }
1270retry:
1271 in6_dev_hold(idev);
1272 if (idev->cnf.use_tempaddr <= 0) {
Jiri Pirko53bd6742013-12-06 09:45:22 +01001273 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001274 pr_info("%s: use_tempaddr is disabled\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 in6_dev_put(idev);
1276 ret = -1;
1277 goto out;
1278 }
1279 spin_lock_bh(&ifp->lock);
1280 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1281 idev->cnf.use_tempaddr = -1; /*XXX*/
1282 spin_unlock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01001283 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001284 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1285 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 in6_dev_put(idev);
1287 ret = -1;
1288 goto out;
1289 }
1290 in6_ifa_hold(ifp);
1291 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
Jiri Bohac9d6280d2016-10-13 18:50:02 +02001292 ipv6_try_regen_rndid(idev, tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 memcpy(&addr.s6_addr[8], idev->rndid, 8);
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001294 age = (now - ifp->tstamp) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001296 regen_advance = idev->cnf.regen_max_retry *
Ian Morris67ba4152014-08-24 21:53:10 +01001297 idev->cnf.dad_transmits *
1298 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
Jiri Bohac76506a92016-10-13 18:52:15 +02001299
1300 /* recalculate max_desync_factor each time and update
1301 * idev->desync_factor if it's larger
1302 */
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001303 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
Jiri Bohac76506a92016-10-13 18:52:15 +02001304 max_desync_factor = min_t(__u32,
1305 idev->cnf.max_desync_factor,
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001306 cnf_temp_preferred_lft - regen_advance);
Jiri Bohac76506a92016-10-13 18:52:15 +02001307
1308 if (unlikely(idev->desync_factor > max_desync_factor)) {
1309 if (max_desync_factor > 0) {
1310 get_random_bytes(&idev->desync_factor,
1311 sizeof(idev->desync_factor));
1312 idev->desync_factor %= max_desync_factor;
1313 } else {
1314 idev->desync_factor = 0;
1315 }
1316 }
1317
1318 tmp_valid_lft = min_t(__u32,
1319 ifp->valid_lft,
1320 idev->cnf.temp_valid_lft + age);
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001321 tmp_prefered_lft = cnf_temp_preferred_lft + age -
Jiri Bohac76506a92016-10-13 18:52:15 +02001322 idev->desync_factor;
Jiri Bohac76506a92016-10-13 18:52:15 +02001323 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1324 tmp_plen = ifp->prefix_len;
1325 tmp_tstamp = ifp->tstamp;
1326 spin_unlock_bh(&ifp->lock);
1327
Jiri Pirko53bd6742013-12-06 09:45:22 +01001328 write_unlock_bh(&idev->lock);
Neil Horman95c385b2007-04-25 17:08:10 -07001329
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001330 /* A temporary address is created only if this calculated Preferred
1331 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1332 * an implementation must not create a temporary address with a zero
1333 * Preferred Lifetime.
Heiner Kallweitecab6702014-03-12 22:13:19 +01001334 * Use age calculation as in addrconf_verify to avoid unnecessary
1335 * temporary addresses being generated.
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001336 */
Heiner Kallweitecab6702014-03-12 22:13:19 +01001337 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1338 if (tmp_prefered_lft <= regen_advance + age) {
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001339 in6_ifa_put(ifp);
1340 in6_dev_put(idev);
1341 ret = -1;
1342 goto out;
1343 }
1344
Neil Horman95c385b2007-04-25 17:08:10 -07001345 addr_flags = IFA_F_TEMPORARY;
1346 /* set in addrconf_prefix_rcv() */
1347 if (ifp->flags & IFA_F_OPTIMISTIC)
1348 addr_flags |= IFA_F_OPTIMISTIC;
1349
Hannes Frederic Sowa4b08a8f2013-08-16 13:02:27 +02001350 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1351 ipv6_addr_scope(&addr), addr_flags,
David Ahernf3d98322017-10-18 09:56:52 -07001352 tmp_valid_lft, tmp_prefered_lft, true);
Hannes Frederic Sowa4b08a8f2013-08-16 13:02:27 +02001353 if (IS_ERR(ift)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 in6_ifa_put(ifp);
1355 in6_dev_put(idev);
Joe Perchesf3213832012-05-15 14:11:53 +00001356 pr_info("%s: retry temporary address regeneration\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 tmpaddr = &addr;
Jiri Pirko53bd6742013-12-06 09:45:22 +01001358 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 goto retry;
1360 }
1361
1362 spin_lock_bh(&ift->lock);
1363 ift->ifpub = ifp;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001364 ift->cstamp = now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 ift->tstamp = tmp_tstamp;
1366 spin_unlock_bh(&ift->lock);
1367
David S. Millercf22f9a2012-04-14 21:37:40 -04001368 addrconf_dad_start(ift);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 in6_ifa_put(ift);
1370 in6_dev_put(idev);
1371out:
1372 return ret;
1373}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374
1375/*
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001376 * Choose an appropriate source address (RFC3484)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 */
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001378enum {
1379 IPV6_SADDR_RULE_INIT = 0,
1380 IPV6_SADDR_RULE_LOCAL,
1381 IPV6_SADDR_RULE_SCOPE,
1382 IPV6_SADDR_RULE_PREFERRED,
1383#ifdef CONFIG_IPV6_MIP6
1384 IPV6_SADDR_RULE_HOA,
1385#endif
1386 IPV6_SADDR_RULE_OIF,
1387 IPV6_SADDR_RULE_LABEL,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001388 IPV6_SADDR_RULE_PRIVACY,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001389 IPV6_SADDR_RULE_ORCHID,
1390 IPV6_SADDR_RULE_PREFIX,
Erik Kline7fd25612014-10-28 18:11:14 +09001391#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1392 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1393#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001394 IPV6_SADDR_RULE_MAX
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001395};
1396
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001397struct ipv6_saddr_score {
1398 int rule;
1399 int addr_type;
1400 struct inet6_ifaddr *ifa;
1401 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1402 int scopedist;
1403 int matchlen;
1404};
1405
1406struct ipv6_saddr_dst {
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001407 const struct in6_addr *addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001408 int ifindex;
1409 int scope;
1410 int label;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001411 unsigned int prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001412};
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001413
Dave Jonesb6f99a22007-03-22 12:27:49 -07001414static inline int ipv6_saddr_preferred(int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415{
Ulrich Weber45bb0062010-02-25 23:28:58 +00001416 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001417 return 1;
1418 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419}
1420
Matteo Croce35e015e2017-09-12 17:46:37 +02001421static bool ipv6_use_optimistic_addr(struct net *net,
1422 struct inet6_dev *idev)
Erik Kline7fd25612014-10-28 18:11:14 +09001423{
1424#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Matteo Croce35e015e2017-09-12 17:46:37 +02001425 if (!idev)
1426 return false;
1427 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1428 return false;
1429 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1430 return false;
1431
1432 return true;
Erik Kline7fd25612014-10-28 18:11:14 +09001433#else
1434 return false;
1435#endif
1436}
1437
Benjamin Thery3de23252008-05-28 14:51:24 +02001438static int ipv6_get_saddr_eval(struct net *net,
1439 struct ipv6_saddr_score *score,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001440 struct ipv6_saddr_dst *dst,
1441 int i)
1442{
1443 int ret;
1444
1445 if (i <= score->rule) {
1446 switch (i) {
1447 case IPV6_SADDR_RULE_SCOPE:
1448 ret = score->scopedist;
1449 break;
1450 case IPV6_SADDR_RULE_PREFIX:
1451 ret = score->matchlen;
1452 break;
1453 default:
1454 ret = !!test_bit(i, score->scorebits);
1455 }
1456 goto out;
1457 }
1458
1459 switch (i) {
1460 case IPV6_SADDR_RULE_INIT:
1461 /* Rule 0: remember if hiscore is not ready yet */
1462 ret = !!score->ifa;
1463 break;
1464 case IPV6_SADDR_RULE_LOCAL:
1465 /* Rule 1: Prefer same address */
1466 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1467 break;
1468 case IPV6_SADDR_RULE_SCOPE:
1469 /* Rule 2: Prefer appropriate scope
1470 *
1471 * ret
1472 * ^
1473 * -1 | d 15
1474 * ---+--+-+---> scope
1475 * |
1476 * | d is scope of the destination.
1477 * B-d | \
1478 * | \ <- smaller scope is better if
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08001479 * B-15 | \ if scope is enough for destination.
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001480 * | ret = B - scope (-1 <= scope >= d <= 15).
1481 * d-C-1 | /
1482 * |/ <- greater is better
1483 * -C / if scope is not enough for destination.
1484 * /| ret = scope - C (-1 <= d < scope <= 15).
1485 *
1486 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1487 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1488 * Assume B = 0 and we get C > 29.
1489 */
1490 ret = __ipv6_addr_src_scope(score->addr_type);
1491 if (ret >= dst->scope)
1492 ret = -ret;
1493 else
1494 ret -= 128; /* 30 is enough */
1495 score->scopedist = ret;
1496 break;
1497 case IPV6_SADDR_RULE_PREFERRED:
Erik Kline7fd25612014-10-28 18:11:14 +09001498 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001499 /* Rule 3: Avoid deprecated and optimistic addresses */
Erik Kline7fd25612014-10-28 18:11:14 +09001500 u8 avoid = IFA_F_DEPRECATED;
1501
Matteo Croce35e015e2017-09-12 17:46:37 +02001502 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
Erik Kline7fd25612014-10-28 18:11:14 +09001503 avoid |= IFA_F_OPTIMISTIC;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001504 ret = ipv6_saddr_preferred(score->addr_type) ||
Erik Kline7fd25612014-10-28 18:11:14 +09001505 !(score->ifa->flags & avoid);
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001506 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001507 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001508#ifdef CONFIG_IPV6_MIP6
1509 case IPV6_SADDR_RULE_HOA:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001510 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001511 /* Rule 4: Prefer home address */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001512 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1513 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001514 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001515 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001516#endif
1517 case IPV6_SADDR_RULE_OIF:
1518 /* Rule 5: Prefer outgoing interface */
1519 ret = (!dst->ifindex ||
1520 dst->ifindex == score->ifa->idev->dev->ifindex);
1521 break;
1522 case IPV6_SADDR_RULE_LABEL:
1523 /* Rule 6: Prefer matching label */
Benjamin Thery3de23252008-05-28 14:51:24 +02001524 ret = ipv6_addr_label(net,
1525 &score->ifa->addr, score->addr_type,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001526 score->ifa->idev->dev->ifindex) == dst->label;
1527 break;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001528 case IPV6_SADDR_RULE_PRIVACY:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001529 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001530 /* Rule 7: Prefer public address
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001531 * Note: prefer temporary address if use_tempaddr >= 2
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001532 */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001533 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1534 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1535 score->ifa->idev->cnf.use_tempaddr >= 2;
1536 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001537 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001538 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001539 case IPV6_SADDR_RULE_ORCHID:
1540 /* Rule 8-: Prefer ORCHID vs ORCHID or
1541 * non-ORCHID vs non-ORCHID
1542 */
1543 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1544 ipv6_addr_orchid(dst->addr));
1545 break;
1546 case IPV6_SADDR_RULE_PREFIX:
1547 /* Rule 8: Use longest matching prefix */
YOSHIFUJI Hideaki / 吉藤英明91b4b042012-09-10 18:41:07 +00001548 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1549 if (ret > score->ifa->prefix_len)
1550 ret = score->ifa->prefix_len;
1551 score->matchlen = ret;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001552 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001553#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1554 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1555 /* Optimistic addresses still have lower precedence than other
1556 * preferred addresses.
1557 */
1558 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1559 break;
1560#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001561 default:
1562 ret = 0;
1563 }
1564
1565 if (ret)
1566 __set_bit(i, score->scorebits);
1567 score->rule = i;
1568out:
1569 return ret;
1570}
1571
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001572static int __ipv6_dev_get_saddr(struct net *net,
1573 struct ipv6_saddr_dst *dst,
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001574 struct inet6_dev *idev,
1575 struct ipv6_saddr_score *scores,
1576 int hiscore_idx)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001577{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001578 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 +09001579
Eric Dumazetf59c0312017-10-07 19:30:27 -07001580 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001581 int i;
1582
1583 /*
1584 * - Tentative Address (RFC2462 section 5.4)
1585 * - A tentative address is not considered
1586 * "assigned to an interface" in the traditional
1587 * sense, unless it is also flagged as optimistic.
1588 * - Candidate Source Address (section 4)
1589 * - In any case, anycast addresses, multicast
1590 * addresses, and the unspecified address MUST
1591 * NOT be included in a candidate set.
1592 */
1593 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1594 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1595 continue;
1596
1597 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1598
1599 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1600 score->addr_type & IPV6_ADDR_MULTICAST)) {
1601 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1602 idev->dev->name);
1603 continue;
1604 }
1605
1606 score->rule = -1;
1607 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1608
1609 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1610 int minihiscore, miniscore;
1611
1612 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1613 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1614
1615 if (minihiscore > miniscore) {
1616 if (i == IPV6_SADDR_RULE_SCOPE &&
1617 score->scopedist > 0) {
1618 /*
1619 * special case:
1620 * each remaining entry
1621 * has too small (not enough)
1622 * scope, because ifa entries
1623 * are sorted by their scope
1624 * values.
1625 */
1626 goto out;
1627 }
1628 break;
1629 } else if (minihiscore < miniscore) {
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001630 swap(hiscore, score);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001631 hiscore_idx = 1 - hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001632
1633 /* restore our iterator */
1634 score->ifa = hiscore->ifa;
1635
1636 break;
1637 }
1638 }
1639 }
1640out:
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001641 return hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001642}
1643
David Ahernafbac6012016-06-16 16:24:26 -07001644static int ipv6_get_saddr_master(struct net *net,
1645 const struct net_device *dst_dev,
1646 const struct net_device *master,
1647 struct ipv6_saddr_dst *dst,
1648 struct ipv6_saddr_score *scores,
1649 int hiscore_idx)
1650{
1651 struct inet6_dev *idev;
1652
1653 idev = __in6_dev_get(dst_dev);
1654 if (idev)
1655 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1656 scores, hiscore_idx);
1657
1658 idev = __in6_dev_get(master);
1659 if (idev)
1660 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1661 scores, hiscore_idx);
1662
1663 return hiscore_idx;
1664}
1665
Patrick McHardyb3f644f2012-08-26 19:14:14 +02001666int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001667 const struct in6_addr *daddr, unsigned int prefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001668 struct in6_addr *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001670 struct ipv6_saddr_score scores[2], *hiscore;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001671 struct ipv6_saddr_dst dst;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001672 struct inet6_dev *idev;
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001673 struct net_device *dev;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001674 int dst_type;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001675 bool use_oif_addr = false;
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001676 int hiscore_idx = 0;
Eric Dumazetcc429c82017-10-07 19:30:28 -07001677 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001679 dst_type = __ipv6_addr_type(daddr);
1680 dst.addr = daddr;
1681 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1682 dst.scope = __ipv6_addr_src_scope(dst_type);
Benjamin Thery3de23252008-05-28 14:51:24 +02001683 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001684 dst.prefs = prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001685
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001686 scores[hiscore_idx].rule = -1;
1687 scores[hiscore_idx].ifa = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001689 rcu_read_lock();
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001690
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001691 /* Candidate Source Address (section 4)
1692 * - multicast and link-local destination address,
1693 * the set of candidate source address MUST only
1694 * include addresses assigned to interfaces
1695 * belonging to the same link as the outgoing
1696 * interface.
1697 * (- For site-local destination addresses, the
1698 * set of candidate source addresses MUST only
1699 * include addresses assigned to interfaces
1700 * belonging to the same site as the outgoing
1701 * interface.)
Erik Kline3985e8a2015-07-22 16:38:25 +09001702 * - "It is RECOMMENDED that the candidate source addresses
1703 * be the set of unicast addresses assigned to the
1704 * interface that will be used to send to the destination
1705 * (the 'outgoing' interface)." (RFC 6724)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001706 */
1707 if (dst_dev) {
Erik Kline3985e8a2015-07-22 16:38:25 +09001708 idev = __in6_dev_get(dst_dev);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001709 if ((dst_type & IPV6_ADDR_MULTICAST) ||
Erik Kline3985e8a2015-07-22 16:38:25 +09001710 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1711 (idev && idev->cnf.use_oif_addrs_only)) {
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001712 use_oif_addr = true;
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001713 }
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001714 }
1715
1716 if (use_oif_addr) {
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001717 if (idev)
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001718 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001719 } else {
David Ahernafbac6012016-06-16 16:24:26 -07001720 const struct net_device *master;
1721 int master_idx = 0;
1722
1723 /* if dst_dev exists and is enslaved to an L3 device, then
1724 * prefer addresses from dst_dev and then the master over
1725 * any other enslaved devices in the L3 domain.
1726 */
1727 master = l3mdev_master_dev_rcu(dst_dev);
1728 if (master) {
1729 master_idx = master->ifindex;
1730
1731 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1732 master, &dst,
1733 scores, hiscore_idx);
1734
1735 if (scores[hiscore_idx].ifa)
1736 goto out;
1737 }
1738
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001739 for_each_netdev_rcu(net, dev) {
David Ahernafbac6012016-06-16 16:24:26 -07001740 /* only consider addresses on devices in the
1741 * same L3 domain
1742 */
1743 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1744 continue;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001745 idev = __in6_dev_get(dev);
1746 if (!idev)
1747 continue;
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001748 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001749 }
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001750 }
David Ahernafbac6012016-06-16 16:24:26 -07001751
1752out:
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001753 hiscore = &scores[hiscore_idx];
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001754 if (!hiscore->ifa)
Eric Dumazetcc429c82017-10-07 19:30:28 -07001755 ret = -EADDRNOTAVAIL;
1756 else
1757 *saddr = hiscore->ifa->addr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001758
Eric Dumazetcc429c82017-10-07 19:30:28 -07001759 rcu_read_unlock();
1760 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761}
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +09001762EXPORT_SYMBOL(ipv6_dev_get_saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763
Amerigo Wang89657792013-06-29 21:30:49 +08001764int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001765 u32 banned_flags)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001766{
1767 struct inet6_ifaddr *ifp;
1768 int err = -EADDRNOTAVAIL;
1769
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01001770 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1771 if (ifp->scope > IFA_LINK)
1772 break;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001773 if (ifp->scope == IFA_LINK &&
1774 !(ifp->flags & banned_flags)) {
1775 *addr = ifp->addr;
1776 err = 0;
1777 break;
1778 }
1779 }
1780 return err;
1781}
1782
Neil Horman95c385b2007-04-25 17:08:10 -07001783int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001784 u32 banned_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785{
1786 struct inet6_dev *idev;
1787 int err = -EADDRNOTAVAIL;
1788
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001789 rcu_read_lock();
Stephen Hemmingere21e8462010-03-20 16:09:01 -07001790 idev = __in6_dev_get(dev);
1791 if (idev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 read_lock_bh(&idev->lock);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001793 err = __ipv6_get_lladdr(idev, addr, banned_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 read_unlock_bh(&idev->lock);
1795 }
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001796 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 return err;
1798}
1799
Eric Dumazetd9bf82c2017-10-07 19:30:24 -07001800static int ipv6_count_addresses(const struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801{
Eric Dumazetd9bf82c2017-10-07 19:30:24 -07001802 const struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 int cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804
Eric Dumazetd9bf82c2017-10-07 19:30:24 -07001805 rcu_read_lock();
1806 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 cnt++;
Eric Dumazetd9bf82c2017-10-07 19:30:24 -07001808 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 return cnt;
1810}
1811
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001812int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
Florian Westphal2a7851b2013-05-17 03:56:10 +00001813 const struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814{
Erik Klinec58da4c2015-02-04 20:01:23 +09001815 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1816}
1817EXPORT_SYMBOL(ipv6_chk_addr);
1818
1819int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1820 const struct net_device *dev, int strict,
1821 u32 banned_flags)
1822{
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001823 struct inet6_ifaddr *ifp;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001824 unsigned int hash = inet6_addr_hash(addr);
Erik Klinec58da4c2015-02-04 20:01:23 +09001825 u32 ifp_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826
stephen hemminger5c578aed2010-03-17 20:31:11 +00001827 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001828 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001829 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcanobfeade02008-01-10 22:43:18 -08001830 continue;
Erik Klinec58da4c2015-02-04 20:01:23 +09001831 /* Decouple optimistic from tentative for evaluation here.
1832 * Ban optimistic addresses explicitly, when required.
1833 */
1834 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1835 ? (ifp->flags&~IFA_F_TENTATIVE)
1836 : ifp->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 if (ipv6_addr_equal(&ifp->addr, addr) &&
Erik Klinec58da4c2015-02-04 20:01:23 +09001838 !(ifp_flags&banned_flags) &&
Ian Morris63159f22015-03-29 14:00:04 +01001839 (!dev || ifp->idev->dev == dev ||
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001840 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1841 rcu_read_unlock_bh();
1842 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 }
1844 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001845
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001846 rcu_read_unlock_bh();
1847 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848}
Erik Klinec58da4c2015-02-04 20:01:23 +09001849EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +09001850
David S. Miller3e81c6d2010-03-20 16:18:00 -07001851static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1852 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853{
Eric Dumazetddbe5032012-07-18 08:11:12 +00001854 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00001855 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856
Sasha Levinb67bfe02013-02-27 17:06:00 -08001857 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001858 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano06bfe652008-01-10 22:43:42 -08001859 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001861 if (!dev || ifp->idev->dev == dev)
David S. Miller3e81c6d2010-03-20 16:18:00 -07001862 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 }
1864 }
David S. Miller3e81c6d2010-03-20 16:18:00 -07001865 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866}
1867
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001868/* Compares an address/prefix_len with addresses on device @dev.
1869 * If one is found it returns true.
1870 */
1871bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1872 const unsigned int prefix_len, struct net_device *dev)
1873{
Eric Dumazet47e26942017-10-07 19:30:25 -07001874 const struct inet6_ifaddr *ifa;
1875 const struct inet6_dev *idev;
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001876 bool ret = false;
1877
1878 rcu_read_lock();
1879 idev = __in6_dev_get(dev);
1880 if (idev) {
Eric Dumazet47e26942017-10-07 19:30:25 -07001881 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001882 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1883 if (ret)
1884 break;
1885 }
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001886 }
1887 rcu_read_unlock();
1888
1889 return ret;
1890}
1891EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1892
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001893int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001894{
Eric Dumazet24ba3332017-10-07 19:30:26 -07001895 const struct inet6_ifaddr *ifa;
1896 const struct inet6_dev *idev;
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001897 int onlink;
1898
1899 onlink = 0;
1900 rcu_read_lock();
1901 idev = __in6_dev_get(dev);
1902 if (idev) {
Eric Dumazet24ba3332017-10-07 19:30:26 -07001903 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001904 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1905 ifa->prefix_len);
1906 if (onlink)
1907 break;
1908 }
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001909 }
1910 rcu_read_unlock();
1911 return onlink;
1912}
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001913EXPORT_SYMBOL(ipv6_chk_prefix);
1914
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001915struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001916 struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917{
David S. Millerb79d1d52010-03-25 21:39:21 -07001918 struct inet6_ifaddr *ifp, *result = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001919 unsigned int hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920
stephen hemminger5c578aed2010-03-17 20:31:11 +00001921 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001922 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001923 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001924 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001926 if (!dev || ifp->idev->dev == dev ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
David S. Millerb79d1d52010-03-25 21:39:21 -07001928 result = ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 in6_ifa_hold(ifp);
1930 break;
1931 }
1932 }
1933 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001934 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935
David S. Millerb79d1d52010-03-25 21:39:21 -07001936 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937}
1938
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939/* Gets referenced address, destroys ifaddr */
1940
Brian Haleycc411d02009-09-09 14:41:32 +00001941static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942{
Lubomir Rintel3d171f32016-01-08 13:47:23 +01001943 if (dad_failed)
1944 ifp->flags |= IFA_F_DADFAILED;
1945
Sabrina Dubrocaec8add22017-06-29 16:56:54 +02001946 if (ifp->flags&IFA_F_TEMPORARY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 struct inet6_ifaddr *ifpub;
1948 spin_lock_bh(&ifp->lock);
1949 ifpub = ifp->ifpub;
1950 if (ifpub) {
1951 in6_ifa_hold(ifpub);
1952 spin_unlock_bh(&ifp->lock);
1953 ipv6_create_tempaddr(ifpub, ifp);
1954 in6_ifa_put(ifpub);
1955 } else {
1956 spin_unlock_bh(&ifp->lock);
1957 }
1958 ipv6_del_addr(ifp);
Sabrina Dubrocaec8add22017-06-29 16:56:54 +02001959 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1960 spin_lock_bh(&ifp->lock);
1961 addrconf_del_dad_work(ifp);
1962 ifp->flags |= IFA_F_TENTATIVE;
1963 spin_unlock_bh(&ifp->lock);
1964 if (dad_failed)
1965 ipv6_ifa_notify(0, ifp);
1966 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001967 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 ipv6_del_addr(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001969 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970}
1971
Herbert Xuf2344a12010-05-18 15:55:27 -07001972static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1973{
1974 int err = -ENOENT;
1975
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001976 spin_lock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001977 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1978 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1979 err = 0;
1980 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001981 spin_unlock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001982
1983 return err;
1984}
1985
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09001986void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1987{
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001988 struct inet6_dev *idev = ifp->idev;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001989 struct net *net = dev_net(ifp->idev->dev);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001990
Ursula Braun853dc2e2010-10-24 23:06:43 +00001991 if (addrconf_dad_end(ifp)) {
1992 in6_ifa_put(ifp);
Herbert Xuf2344a12010-05-18 15:55:27 -07001993 return;
Ursula Braun853dc2e2010-10-24 23:06:43 +00001994 }
Herbert Xuf2344a12010-05-18 15:55:27 -07001995
Joe Perchese87cc472012-05-13 21:56:26 +00001996 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1997 ifp->idev->dev->name, &ifp->addr);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001998
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001999 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09002000
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002001 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2002 int scope = ifp->scope;
2003 u32 flags = ifp->flags;
2004 struct in6_addr new_addr;
2005 struct inet6_ifaddr *ifp2;
2006 u32 valid_lft, preferred_lft;
2007 int pfxlen = ifp->prefix_len;
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002008 int retries = ifp->stable_privacy_retry + 1;
2009
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01002010 if (retries > net->ipv6.sysctl.idgen_retries) {
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002011 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2012 ifp->idev->dev->name);
2013 goto errdad;
2014 }
2015
2016 new_addr = ifp->addr;
2017 if (ipv6_generate_stable_address(&new_addr, retries,
2018 idev))
2019 goto errdad;
2020
2021 valid_lft = ifp->valid_lft;
2022 preferred_lft = ifp->prefered_lft;
2023
2024 spin_unlock_bh(&ifp->lock);
2025
2026 if (idev->cnf.max_addresses &&
2027 ipv6_count_addresses(idev) >=
2028 idev->cnf.max_addresses)
2029 goto lock_errdad;
2030
2031 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2032 ifp->idev->dev->name);
2033
2034 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2035 scope, flags, valid_lft,
David Ahernf3d98322017-10-18 09:56:52 -07002036 preferred_lft, false);
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002037 if (IS_ERR(ifp2))
2038 goto lock_errdad;
2039
2040 spin_lock_bh(&ifp2->lock);
2041 ifp2->stable_privacy_retry = retries;
2042 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2043 spin_unlock_bh(&ifp2->lock);
2044
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01002045 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002046 in6_ifa_put(ifp2);
2047lock_errdad:
2048 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09002049 }
2050
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01002051errdad:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002052 /* transition from _POSTDAD to _ERRDAD */
2053 ifp->state = INET6_IFADDR_STATE_ERRDAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01002054 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002055
2056 addrconf_mod_dad_work(ifp, 0);
Wei Yongjun751eb6b2016-09-05 16:06:31 +08002057 in6_ifa_put(ifp);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09002058}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002060/* Join to solicited addr multicast group.
2061 * caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002062void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063{
2064 struct in6_addr maddr;
2065
2066 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2067 return;
2068
2069 addrconf_addr_solict_mult(addr, &maddr);
2070 ipv6_dev_mc_inc(dev, &maddr);
2071}
2072
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002073/* caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002074void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075{
2076 struct in6_addr maddr;
2077
2078 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2079 return;
2080
2081 addrconf_addr_solict_mult(addr, &maddr);
2082 __ipv6_dev_mc_dec(idev, &maddr);
2083}
2084
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002085/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002086static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087{
2088 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002089
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002090 if (ifp->prefix_len >= 127) /* RFC 6164 */
Bjørn Mork2bda8a02011-07-05 23:04:13 +00002091 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2093 if (ipv6_addr_any(&addr))
2094 return;
WANG Cong013b4d92014-09-11 15:35:11 -07002095 __ipv6_dev_ac_inc(ifp->idev, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096}
2097
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002098/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002099static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100{
2101 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002102
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002103 if (ifp->prefix_len >= 127) /* RFC 6164 */
YOSHIFUJI Hideaki32019e62011-07-24 11:44:34 +00002104 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2106 if (ipv6_addr_any(&addr))
2107 return;
2108 __ipv6_dev_ac_dec(ifp->idev, &addr);
2109}
2110
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002111static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002112{
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002113 switch (dev->addr_len) {
2114 case ETH_ALEN:
Luiz Augusto von Dentz9dae2e02017-03-12 10:19:38 +02002115 memcpy(eui, dev->dev_addr, 3);
2116 eui[3] = 0xFF;
2117 eui[4] = 0xFE;
2118 memcpy(eui + 5, dev->dev_addr + 3, 3);
2119 break;
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002120 case EUI64_ADDR_LEN:
2121 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2122 eui[0] ^= 2;
2123 break;
2124 default:
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002125 return -1;
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002126 }
2127
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002128 return 0;
2129}
2130
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002131static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2132{
2133 union fwnet_hwaddr *ha;
2134
2135 if (dev->addr_len != FWNET_ALEN)
2136 return -1;
2137
2138 ha = (union fwnet_hwaddr *)dev->dev_addr;
2139
2140 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2141 eui[0] ^= 2;
2142 return 0;
2143}
2144
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002145static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2146{
2147 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2148 if (dev->addr_len != ARCNET_ALEN)
2149 return -1;
2150 memset(eui, 0, 7);
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002151 eui[7] = *(u8 *)dev->dev_addr;
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002152 return 0;
2153}
2154
2155static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2156{
2157 if (dev->addr_len != INFINIBAND_ALEN)
2158 return -1;
2159 memcpy(eui, dev->dev_addr + 12, 8);
2160 eui[0] |= 2;
2161 return 0;
2162}
2163
stephen hemmingerc61393e2010-10-04 20:17:53 +00002164static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002165{
Sascha Hlusiak9af28512009-05-19 12:56:51 +00002166 if (addr == 0)
2167 return -1;
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002168 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2169 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2170 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2171 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2172 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2173 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2174 eui[1] = 0;
2175 eui[2] = 0x5E;
2176 eui[3] = 0xFE;
2177 memcpy(eui + 4, &addr, 4);
2178 return 0;
2179}
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002180
2181static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2182{
2183 if (dev->priv_flags & IFF_ISATAP)
2184 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2185 return -1;
2186}
2187
stephen hemmingeraee80b52011-06-08 10:44:30 +00002188static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2189{
2190 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2191}
2192
Nicolas Dichtele8377352013-08-20 12:16:06 +02002193static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2194{
2195 memcpy(eui, dev->perm_addr, 3);
2196 memcpy(eui + 5, dev->perm_addr + 3, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 eui[0] ^= 2;
2200 return 0;
2201}
2202
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2204{
2205 switch (dev->type) {
2206 case ARPHRD_ETHER:
2207 case ARPHRD_FDDI:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002208 return addrconf_ifid_eui48(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 case ARPHRD_ARCNET:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002210 return addrconf_ifid_arcnet(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211 case ARPHRD_INFINIBAND:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002212 return addrconf_ifid_infiniband(eui, dev);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002213 case ARPHRD_SIT:
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002214 return addrconf_ifid_sit(eui, dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00002215 case ARPHRD_IPGRE:
Felix Jia45ce0fd2017-01-26 16:59:18 +13002216 case ARPHRD_TUNNEL:
stephen hemmingeraee80b52011-06-08 10:44:30 +00002217 return addrconf_ifid_gre(eui, dev);
Jukka Rissanene74bccb82013-12-11 17:05:36 +02002218 case ARPHRD_6LOWPAN:
Alexander Aring8a7a4b42017-03-12 10:19:36 +02002219 return addrconf_ifid_6lowpan(eui, dev);
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002220 case ARPHRD_IEEE1394:
2221 return addrconf_ifid_ieee1394(eui, dev);
Nicolas Dichtele8377352013-08-20 12:16:06 +02002222 case ARPHRD_TUNNEL6:
Felix Jia45ce0fd2017-01-26 16:59:18 +13002223 case ARPHRD_IP6GRE:
Nicolas Dichtele8377352013-08-20 12:16:06 +02002224 return addrconf_ifid_ip6tnl(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225 }
2226 return -1;
2227}
2228
2229static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2230{
2231 int err = -1;
2232 struct inet6_ifaddr *ifp;
2233
2234 read_lock_bh(&idev->lock);
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01002235 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2236 if (ifp->scope > IFA_LINK)
2237 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2239 memcpy(eui, ifp->addr.s6_addr+8, 8);
2240 err = 0;
2241 break;
2242 }
2243 }
2244 read_unlock_bh(&idev->lock);
2245 return err;
2246}
2247
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002249static void ipv6_regen_rndid(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251regen:
YOSHIFUJI Hideaki955189e2006-03-20 16:54:09 -08002252 get_random_bytes(idev->rndid, sizeof(idev->rndid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 idev->rndid[0] &= ~0x02;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254
2255 /*
2256 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2257 * check if generated address is not inappropriate
2258 *
2259 * - Reserved subnet anycast (RFC 2526)
2260 * 11111101 11....11 1xxxxxxx
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002261 * - ISATAP (RFC4214) 6.1
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 * 00-00-5E-FE-xx-xx-xx-xx
2263 * - value 0
2264 * - XXX: already assigned to an address on the device
2265 */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002266 if (idev->rndid[0] == 0xfd &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2268 (idev->rndid[7]&0x80))
2269 goto regen;
2270 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2271 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2272 goto regen;
2273 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2274 goto regen;
2275 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276}
2277
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002278static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002279{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002281 ipv6_regen_rndid(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283
2284/*
2285 * Add prefix route.
2286 */
2287
2288static void
2289addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07002290 unsigned long expires, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291{
Thomas Graf86872cb2006-08-22 00:01:08 -07002292 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002293 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
Thomas Graf86872cb2006-08-22 00:01:08 -07002294 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2295 .fc_ifindex = dev->ifindex,
2296 .fc_expires = expires,
2297 .fc_dst_len = plen,
2298 .fc_flags = RTF_UP | flags,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002299 .fc_nlinfo.nl_net = dev_net(dev),
Stephen Hemmingerf410a1f2008-08-23 05:16:46 -07002300 .fc_protocol = RTPROT_KERNEL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002301 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00002303 cfg.fc_dst = *pfx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304
2305 /* Prevent useless cloning on PtP SIT.
2306 This thing is done here expecting that the whole
2307 class of non-broadcast devices need not cloning.
2308 */
Amerigo Wang07a93622012-10-29 16:23:10 +00002309#if IS_ENABLED(CONFIG_IPV6_SIT)
Thomas Graf86872cb2006-08-22 00:01:08 -07002310 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2311 cfg.fc_flags |= RTF_NONEXTHOP;
Joerg Roedel0be669b2006-10-10 14:49:53 -07002312#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313
David Ahern333c4302017-05-21 10:12:04 -06002314 ip6_route_add(&cfg, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315}
2316
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002317
2318static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2319 int plen,
2320 const struct net_device *dev,
2321 u32 flags, u32 noflags)
2322{
2323 struct fib6_node *fn;
2324 struct rt6_info *rt = NULL;
2325 struct fib6_table *table;
David Ahernca254492015-10-12 11:47:10 -07002326 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002327
David Ahernca254492015-10-12 11:47:10 -07002328 table = fib6_get_table(dev_net(dev), tb_id);
Ian Morris63159f22015-03-29 14:00:04 +01002329 if (!table)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002330 return NULL;
2331
Wei Wang66f5d6c2017-10-06 12:06:10 -07002332 rcu_read_lock();
Wei Wang38fbeee2017-10-06 12:06:02 -07002333 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002334 if (!fn)
2335 goto out;
Martin KaFai Lau1f56a012015-04-28 13:03:03 -07002336
Wei Wang66f5d6c2017-10-06 12:06:10 -07002337 for_each_fib6_node_rt_rcu(fn) {
David S. Millerd1918542011-12-28 20:19:20 -05002338 if (rt->dst.dev->ifindex != dev->ifindex)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002339 continue;
2340 if ((rt->rt6i_flags & flags) != flags)
2341 continue;
Romain Kuntz85da53b2013-01-09 15:02:26 +01002342 if ((rt->rt6i_flags & noflags) != 0)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002343 continue;
Wei Wangd3843fe2017-10-06 12:06:06 -07002344 if (!dst_hold_safe(&rt->dst))
2345 rt = NULL;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002346 break;
2347 }
2348out:
Wei Wang66f5d6c2017-10-06 12:06:10 -07002349 rcu_read_unlock();
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002350 return rt;
2351}
2352
2353
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354/* Create "default" multicast route to the interface */
2355
2356static void addrconf_add_mroute(struct net_device *dev)
2357{
Thomas Graf86872cb2006-08-22 00:01:08 -07002358 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002359 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002360 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2361 .fc_ifindex = dev->ifindex,
2362 .fc_dst_len = 8,
2363 .fc_flags = RTF_UP,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002364 .fc_nlinfo.nl_net = dev_net(dev),
Thomas Graf86872cb2006-08-22 00:01:08 -07002365 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366
Thomas Graf86872cb2006-08-22 00:01:08 -07002367 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2368
David Ahern333c4302017-05-21 10:12:04 -06002369 ip6_route_add(&cfg, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370}
2371
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2373{
2374 struct inet6_dev *idev;
2375
2376 ASSERT_RTNL();
2377
Stephen Hemmingere21e8462010-03-20 16:09:01 -07002378 idev = ipv6_find_idev(dev);
2379 if (!idev)
Brian Haley64e724f2010-07-20 10:34:30 +00002380 return ERR_PTR(-ENOBUFS);
2381
2382 if (idev->cnf.disable_ipv6)
2383 return ERR_PTR(-EACCES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384
2385 /* Add default multicast route */
David Ahernba46ee42016-06-13 13:44:18 -07002386 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
Li Wei4af04ab2011-12-06 21:23:45 +00002387 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389 return idev;
2390}
2391
Jiri Pirko53bd6742013-12-06 09:45:22 +01002392static void manage_tempaddrs(struct inet6_dev *idev,
2393 struct inet6_ifaddr *ifp,
2394 __u32 valid_lft, __u32 prefered_lft,
2395 bool create, unsigned long now)
2396{
2397 u32 flags;
2398 struct inet6_ifaddr *ift;
2399
2400 read_lock_bh(&idev->lock);
2401 /* update all temporary addresses in the list */
2402 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2403 int age, max_valid, max_prefered;
2404
2405 if (ifp != ift->ifpub)
2406 continue;
2407
2408 /* RFC 4941 section 3.3:
2409 * If a received option will extend the lifetime of a public
2410 * address, the lifetimes of temporary addresses should
2411 * be extended, subject to the overall constraint that no
2412 * temporary addresses should ever remain "valid" or "preferred"
2413 * for a time longer than (TEMP_VALID_LIFETIME) or
2414 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2415 */
2416 age = (now - ift->cstamp) / HZ;
2417 max_valid = idev->cnf.temp_valid_lft - age;
2418 if (max_valid < 0)
2419 max_valid = 0;
2420
2421 max_prefered = idev->cnf.temp_prefered_lft -
Jiri Bohac76506a92016-10-13 18:52:15 +02002422 idev->desync_factor - age;
Jiri Pirko53bd6742013-12-06 09:45:22 +01002423 if (max_prefered < 0)
2424 max_prefered = 0;
2425
2426 if (valid_lft > max_valid)
2427 valid_lft = max_valid;
2428
2429 if (prefered_lft > max_prefered)
2430 prefered_lft = max_prefered;
2431
2432 spin_lock(&ift->lock);
2433 flags = ift->flags;
2434 ift->valid_lft = valid_lft;
2435 ift->prefered_lft = prefered_lft;
2436 ift->tstamp = now;
2437 if (prefered_lft > 0)
2438 ift->flags &= ~IFA_F_DEPRECATED;
2439
2440 spin_unlock(&ift->lock);
2441 if (!(flags&IFA_F_TENTATIVE))
2442 ipv6_ifa_notify(0, ift);
2443 }
2444
2445 if ((create || list_empty(&idev->tempaddr_list)) &&
2446 idev->cnf.use_tempaddr > 0) {
2447 /* When a new public address is created as described
2448 * in [ADDRCONF], also create a new temporary address.
2449 * Also create a temporary address if it's enabled but
2450 * no temporary address currently exists.
2451 */
2452 read_unlock_bh(&idev->lock);
2453 ipv6_create_tempaddr(ifp, NULL);
2454 } else {
2455 read_unlock_bh(&idev->lock);
2456 }
2457}
2458
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002459static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2460{
Felix Jiad35a00b2017-01-26 16:59:17 +13002461 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2462 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002463}
2464
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002465int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2466 const struct prefix_info *pinfo,
2467 struct inet6_dev *in6_dev,
2468 const struct in6_addr *addr, int addr_type,
2469 u32 addr_flags, bool sllao, bool tokenized,
2470 __u32 valid_lft, u32 prefered_lft)
Alexander Aring4f672232016-06-15 21:20:22 +02002471{
2472 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2473 int create = 0, update_lft = 0;
2474
2475 if (!ifp && valid_lft) {
2476 int max_addresses = in6_dev->cnf.max_addresses;
2477
2478#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Matteo Croce35e015e2017-09-12 17:46:37 +02002479 if ((net->ipv6.devconf_all->optimistic_dad ||
2480 in6_dev->cnf.optimistic_dad) &&
Alexander Aring4f672232016-06-15 21:20:22 +02002481 !net->ipv6.devconf_all->forwarding && sllao)
2482 addr_flags |= IFA_F_OPTIMISTIC;
2483#endif
2484
2485 /* Do not allow to create too much of autoconfigured
2486 * addresses; this would be too easy way to crash kernel.
2487 */
2488 if (!max_addresses ||
2489 ipv6_count_addresses(in6_dev) < max_addresses)
2490 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2491 pinfo->prefix_len,
2492 addr_type&IPV6_ADDR_SCOPE_MASK,
2493 addr_flags, valid_lft,
David Ahernf3d98322017-10-18 09:56:52 -07002494 prefered_lft, false);
Alexander Aring4f672232016-06-15 21:20:22 +02002495
2496 if (IS_ERR_OR_NULL(ifp))
2497 return -1;
2498
2499 update_lft = 0;
2500 create = 1;
2501 spin_lock_bh(&ifp->lock);
2502 ifp->flags |= IFA_F_MANAGETEMPADDR;
2503 ifp->cstamp = jiffies;
2504 ifp->tokenized = tokenized;
2505 spin_unlock_bh(&ifp->lock);
2506 addrconf_dad_start(ifp);
2507 }
2508
2509 if (ifp) {
2510 u32 flags;
2511 unsigned long now;
2512 u32 stored_lft;
2513
2514 /* update lifetime (RFC2462 5.5.3 e) */
2515 spin_lock_bh(&ifp->lock);
2516 now = jiffies;
2517 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2518 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2519 else
2520 stored_lft = 0;
2521 if (!update_lft && !create && stored_lft) {
2522 const u32 minimum_lft = min_t(u32,
2523 stored_lft, MIN_VALID_LIFETIME);
2524 valid_lft = max(valid_lft, minimum_lft);
2525
2526 /* RFC4862 Section 5.5.3e:
2527 * "Note that the preferred lifetime of the
2528 * corresponding address is always reset to
2529 * the Preferred Lifetime in the received
2530 * Prefix Information option, regardless of
2531 * whether the valid lifetime is also reset or
2532 * ignored."
2533 *
2534 * So we should always update prefered_lft here.
2535 */
2536 update_lft = 1;
2537 }
2538
2539 if (update_lft) {
2540 ifp->valid_lft = valid_lft;
2541 ifp->prefered_lft = prefered_lft;
2542 ifp->tstamp = now;
2543 flags = ifp->flags;
2544 ifp->flags &= ~IFA_F_DEPRECATED;
2545 spin_unlock_bh(&ifp->lock);
2546
2547 if (!(flags&IFA_F_TENTATIVE))
2548 ipv6_ifa_notify(0, ifp);
2549 } else
2550 spin_unlock_bh(&ifp->lock);
2551
2552 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2553 create, now);
2554
2555 in6_ifa_put(ifp);
2556 addrconf_verify();
2557 }
2558
2559 return 0;
2560}
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002561EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
Alexander Aring4f672232016-06-15 21:20:22 +02002562
Neil Hormane6bff992012-01-04 10:49:15 +00002563void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564{
2565 struct prefix_info *pinfo;
2566 __u32 valid_lft;
2567 __u32 prefered_lft;
Alexander Aring4f672232016-06-15 21:20:22 +02002568 int addr_type, err;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002569 u32 addr_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570 struct inet6_dev *in6_dev;
Brian Haley56d417b2009-06-01 03:07:33 -07002571 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002572
2573 pinfo = (struct prefix_info *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002574
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575 if (len < sizeof(struct prefix_info)) {
dingtianhongba3542e2013-08-17 10:27:04 +08002576 ADBG("addrconf: prefix option too short\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 return;
2578 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002579
Linus Torvalds1da177e2005-04-16 15:20:36 -07002580 /*
2581 * Validation checks ([ADDRCONF], page 19)
2582 */
2583
2584 addr_type = ipv6_addr_type(&pinfo->prefix);
2585
2586 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2587 return;
2588
2589 valid_lft = ntohl(pinfo->valid);
2590 prefered_lft = ntohl(pinfo->prefered);
2591
2592 if (prefered_lft > valid_lft) {
Joe Perchese87cc472012-05-13 21:56:26 +00002593 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 return;
2595 }
2596
2597 in6_dev = in6_dev_get(dev);
2598
Ian Morris63159f22015-03-29 14:00:04 +01002599 if (!in6_dev) {
Joe Perchese87cc472012-05-13 21:56:26 +00002600 net_dbg_ratelimited("addrconf: device %s not configured\n",
2601 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002602 return;
2603 }
2604
2605 /*
2606 * Two things going on here:
2607 * 1) Add routes for on-link prefixes
2608 * 2) Configure prefixes with the auto flag set
2609 */
2610
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002611 if (pinfo->onlink) {
2612 struct rt6_info *rt;
2613 unsigned long rt_expires;
2614
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002615 /* Avoid arithmetic overflow. Really, we could
2616 * save rt_expires in seconds, likely valid_lft,
2617 * but it would require division in fib gc, that it
2618 * not good.
2619 */
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002620 if (HZ > USER_HZ)
2621 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2622 else
2623 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
YOSHIFUJI Hideaki3dd4bc62005-12-19 14:02:45 -08002624
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002625 if (addrconf_finite_timeout(rt_expires))
2626 rt_expires *= HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002628 rt = addrconf_get_prefix_route(&pinfo->prefix,
2629 pinfo->prefix_len,
2630 dev,
2631 RTF_ADDRCONF | RTF_PREFIX_RT,
2632 RTF_GATEWAY | RTF_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002633
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002634 if (rt) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002635 /* Autoconf prefix route */
2636 if (valid_lft == 0) {
2637 ip6_del_rt(rt);
2638 rt = NULL;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002639 } else if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002640 /* not infinity */
Gao feng1716a962012-04-06 00:13:10 +00002641 rt6_set_expires(rt, jiffies + rt_expires);
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002642 } else {
Gao feng1716a962012-04-06 00:13:10 +00002643 rt6_clean_expires(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 }
2645 } else if (valid_lft) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002646 clock_t expires = 0;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002647 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2648 if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002649 /* not infinity */
2650 flags |= RTF_EXPIRES;
2651 expires = jiffies_to_clock_t(rt_expires);
2652 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002654 dev, expires, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00002656 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 }
2658
2659 /* Try to figure out our local address for this prefix */
2660
2661 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 struct in6_addr addr;
Alexander Aringf997c552016-06-15 21:20:23 +02002663 bool tokenized = false, dev_addr_generated = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664
2665 if (pinfo->prefix_len == 64) {
2666 memcpy(&addr, &pinfo->prefix, 8);
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002667
2668 if (!ipv6_addr_any(&in6_dev->token)) {
2669 read_lock_bh(&in6_dev->lock);
2670 memcpy(addr.s6_addr + 8,
2671 in6_dev->token.s6_addr + 8, 8);
2672 read_unlock_bh(&in6_dev->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00002673 tokenized = true;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002674 } else if (is_addr_mode_generate_stable(in6_dev) &&
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01002675 !ipv6_generate_stable_address(&addr, 0,
2676 in6_dev)) {
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002677 addr_flags |= IFA_F_STABLE_PRIVACY;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01002678 goto ok;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002679 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2680 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
Alexander Aring4f672232016-06-15 21:20:22 +02002681 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002682 } else {
2683 dev_addr_generated = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 }
2685 goto ok;
2686 }
Joe Perchese87cc472012-05-13 21:56:26 +00002687 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2688 pinfo->prefix_len);
Alexander Aring4f672232016-06-15 21:20:22 +02002689 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690
2691ok:
Alexander Aring4f672232016-06-15 21:20:22 +02002692 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2693 &addr, addr_type,
2694 addr_flags, sllao,
2695 tokenized, valid_lft,
2696 prefered_lft);
2697 if (err)
2698 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002699
2700 /* Ignore error case here because previous prefix add addr was
2701 * successful which will be notified.
2702 */
2703 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2704 addr_type, addr_flags, sllao,
2705 tokenized, valid_lft,
2706 prefered_lft,
2707 dev_addr_generated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002708 }
2709 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
Alexander Aring4f672232016-06-15 21:20:22 +02002710put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711 in6_dev_put(in6_dev);
2712}
2713
2714/*
2715 * Set destination address.
2716 * Special case for SIT interfaces where we create a new "virtual"
2717 * device.
2718 */
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002719int addrconf_set_dstaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720{
2721 struct in6_ifreq ireq;
2722 struct net_device *dev;
2723 int err = -EINVAL;
2724
2725 rtnl_lock();
2726
2727 err = -EFAULT;
2728 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2729 goto err_exit;
2730
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002731 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732
2733 err = -ENODEV;
Ian Morris63159f22015-03-29 14:00:04 +01002734 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735 goto err_exit;
2736
Amerigo Wang07a93622012-10-29 16:23:10 +00002737#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002738 if (dev->type == ARPHRD_SIT) {
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002739 const struct net_device_ops *ops = dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740 struct ifreq ifr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741 struct ip_tunnel_parm p;
2742
2743 err = -EADDRNOTAVAIL;
2744 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2745 goto err_exit;
2746
2747 memset(&p, 0, sizeof(p));
2748 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2749 p.iph.saddr = 0;
2750 p.iph.version = 4;
2751 p.iph.ihl = 5;
2752 p.iph.protocol = IPPROTO_IPV6;
2753 p.iph.ttl = 64;
Stephen Hemmingerd20b3102008-01-21 00:48:43 -08002754 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002756 if (ops->ndo_do_ioctl) {
2757 mm_segment_t oldfs = get_fs();
2758
2759 set_fs(KERNEL_DS);
2760 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2761 set_fs(oldfs);
2762 } else
2763 err = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764
2765 if (err == 0) {
2766 err = -ENOBUFS;
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002767 dev = __dev_get_by_name(net, p.name);
2768 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002769 goto err_exit;
2770 err = dev_open(dev);
2771 }
2772 }
Joerg Roedel0be669b2006-10-10 14:49:53 -07002773#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774
2775err_exit:
2776 rtnl_unlock();
2777 return err;
2778}
2779
Madhu Challa93a714d2015-02-25 09:58:35 -08002780static int ipv6_mc_config(struct sock *sk, bool join,
2781 const struct in6_addr *addr, int ifindex)
2782{
2783 int ret;
2784
2785 ASSERT_RTNL();
2786
2787 lock_sock(sk);
2788 if (join)
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002789 ret = ipv6_sock_mc_join(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002790 else
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002791 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002792 release_sock(sk);
2793
2794 return ret;
2795}
2796
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797/*
2798 * Manual configuration of address on an interface
2799 */
Jiri Pirko479840f2013-12-06 09:45:21 +01002800static int inet6_addr_add(struct net *net, int ifindex,
2801 const struct in6_addr *pfx,
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002802 const struct in6_addr *peer_pfx,
Jiri Pirko479840f2013-12-06 09:45:21 +01002803 unsigned int plen, __u32 ifa_flags,
2804 __u32 prefered_lft, __u32 valid_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805{
2806 struct inet6_ifaddr *ifp;
2807 struct inet6_dev *idev;
2808 struct net_device *dev;
Madhu Challa93a714d2015-02-25 09:58:35 -08002809 unsigned long timeout;
2810 clock_t expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811 int scope;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002812 u32 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002813
2814 ASSERT_RTNL();
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002815
Thomas Graf24ef0da2008-05-28 16:54:22 +02002816 if (plen > 128)
2817 return -EINVAL;
2818
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002819 /* check the lifetime */
2820 if (!valid_lft || prefered_lft > valid_lft)
2821 return -EINVAL;
2822
Jiri Pirko53bd6742013-12-06 09:45:22 +01002823 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2824 return -EINVAL;
2825
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002826 dev = __dev_get_by_index(net, ifindex);
2827 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002828 return -ENODEV;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002829
Brian Haley64e724f2010-07-20 10:34:30 +00002830 idev = addrconf_add_dev(dev);
2831 if (IS_ERR(idev))
2832 return PTR_ERR(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833
Madhu Challa93a714d2015-02-25 09:58:35 -08002834 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2835 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2836 true, pfx, ifindex);
2837
2838 if (ret < 0)
2839 return ret;
2840 }
2841
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 scope = ipv6_addr_scope(pfx);
2843
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002844 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2845 if (addrconf_finite_timeout(timeout)) {
2846 expires = jiffies_to_clock_t(timeout * HZ);
2847 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002848 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002849 } else {
2850 expires = 0;
2851 flags = 0;
2852 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002853 }
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002854
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002855 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2856 if (addrconf_finite_timeout(timeout)) {
2857 if (timeout == 0)
2858 ifa_flags |= IFA_F_DEPRECATED;
2859 prefered_lft = timeout;
2860 }
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002861
Jiri Benc8a226b22013-08-01 10:41:28 +02002862 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
David Ahernf3d98322017-10-18 09:56:52 -07002863 valid_lft, prefered_lft, true);
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002864
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865 if (!IS_ERR(ifp)) {
Thomas Haller761aac72014-01-15 15:36:58 +01002866 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2867 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2868 expires, flags);
2869 }
2870
Neil Horman95c385b2007-04-25 17:08:10 -07002871 /*
2872 * Note that section 3.1 of RFC 4429 indicates
2873 * that the Optimistic flag should not be set for
2874 * manually configured addresses
2875 */
David S. Millercf22f9a2012-04-14 21:37:40 -04002876 addrconf_dad_start(ifp);
Jiri Pirko53bd6742013-12-06 09:45:22 +01002877 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2878 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2879 true, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002880 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002881 addrconf_verify_rtnl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882 return 0;
Madhu Challa93a714d2015-02-25 09:58:35 -08002883 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2884 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2885 false, pfx, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 }
2887
2888 return PTR_ERR(ifp);
2889}
2890
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002891static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2892 const struct in6_addr *pfx, unsigned int plen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893{
2894 struct inet6_ifaddr *ifp;
2895 struct inet6_dev *idev;
2896 struct net_device *dev;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002897
Thomas Graf24ef0da2008-05-28 16:54:22 +02002898 if (plen > 128)
2899 return -EINVAL;
2900
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002901 dev = __dev_get_by_index(net, ifindex);
2902 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903 return -ENODEV;
2904
Ian Morrise5d08d72014-11-23 21:28:43 +00002905 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01002906 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002907 return -ENXIO;
2908
2909 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00002910 list_for_each_entry(ifp, &idev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002911 if (ifp->prefix_len == plen &&
2912 ipv6_addr_equal(pfx, &ifp->addr)) {
2913 in6_ifa_hold(ifp);
2914 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002915
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002916 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2917 (ifa_flags & IFA_F_MANAGETEMPADDR))
2918 manage_tempaddrs(idev, ifp, 0, 0, false,
2919 jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002920 ipv6_del_addr(ifp);
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002921 addrconf_verify_rtnl();
Madhu Challa93a714d2015-02-25 09:58:35 -08002922 if (ipv6_addr_is_multicast(pfx)) {
2923 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2924 false, pfx, dev->ifindex);
2925 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002926 return 0;
2927 }
2928 }
2929 read_unlock_bh(&idev->lock);
2930 return -EADDRNOTAVAIL;
2931}
2932
2933
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002934int addrconf_add_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935{
2936 struct in6_ifreq ireq;
2937 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002938
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002939 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940 return -EPERM;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002941
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2943 return -EFAULT;
2944
2945 rtnl_lock();
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002946 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002947 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2948 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949 rtnl_unlock();
2950 return err;
2951}
2952
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002953int addrconf_del_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002954{
2955 struct in6_ifreq ireq;
2956 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002957
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002958 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959 return -EPERM;
2960
2961 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2962 return -EFAULT;
2963
2964 rtnl_lock();
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002965 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002966 ireq.ifr6_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967 rtnl_unlock();
2968 return err;
2969}
2970
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002971static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2972 int plen, int scope)
2973{
2974 struct inet6_ifaddr *ifp;
2975
Jiri Benc8a226b22013-08-01 10:41:28 +02002976 ifp = ipv6_add_addr(idev, addr, NULL, plen,
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01002977 scope, IFA_F_PERMANENT,
David Ahernf3d98322017-10-18 09:56:52 -07002978 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
2979 true);
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002980 if (!IS_ERR(ifp)) {
2981 spin_lock_bh(&ifp->lock);
2982 ifp->flags &= ~IFA_F_TENTATIVE;
2983 spin_unlock_bh(&ifp->lock);
Paolo Abeni764d3be2016-11-22 16:57:40 +01002984 rt_genid_bump_ipv6(dev_net(idev->dev));
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002985 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2986 in6_ifa_put(ifp);
2987 }
2988}
2989
Amerigo Wang07a93622012-10-29 16:23:10 +00002990#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991static void sit_add_v4_addrs(struct inet6_dev *idev)
2992{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 struct in6_addr addr;
2994 struct net_device *dev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002995 struct net *net = dev_net(idev->dev);
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002996 int scope, plen;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002997 u32 pflags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998
2999 ASSERT_RTNL();
3000
3001 memset(&addr, 0, sizeof(struct in6_addr));
3002 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3003
3004 if (idev->dev->flags&IFF_POINTOPOINT) {
3005 addr.s6_addr32[0] = htonl(0xfe800000);
3006 scope = IFA_LINK;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01003007 plen = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003008 } else {
3009 scope = IPV6_ADDR_COMPATv4;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01003010 plen = 96;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01003011 pflags |= RTF_NONEXTHOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012 }
3013
3014 if (addr.s6_addr32[3]) {
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01003015 add_addr(idev, &addr, plen, scope);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01003016 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003017 return;
3018 }
3019
Benjamin Thery6fda7352008-03-05 10:47:47 -08003020 for_each_netdev(net, dev) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003021 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022 if (in_dev && (dev->flags & IFF_UP)) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003023 struct in_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024
3025 int flag = scope;
3026
3027 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003028
3029 addr.s6_addr32[3] = ifa->ifa_local;
3030
3031 if (ifa->ifa_scope == RT_SCOPE_LINK)
3032 continue;
3033 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3034 if (idev->dev->flags&IFF_POINTOPOINT)
3035 continue;
3036 flag |= IFA_HOST;
3037 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08003039 add_addr(idev, &addr, plen, flag);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01003040 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3041 pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003042 }
3043 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003044 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045}
Joerg Roedel0be669b2006-10-10 14:49:53 -07003046#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047
3048static void init_loopback(struct net_device *dev)
3049{
3050 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003051
3052 /* ::1 */
3053
3054 ASSERT_RTNL();
3055
Ian Morrise5d08d72014-11-23 21:28:43 +00003056 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003057 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003058 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 return;
3060 }
3061
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08003062 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063}
3064
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003065void addrconf_add_linklocal(struct inet6_dev *idev,
3066 const struct in6_addr *addr, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003068 struct inet6_ifaddr *ifp;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003069 u32 addr_flags = flags | IFA_F_PERMANENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070
Neil Horman95c385b2007-04-25 17:08:10 -07003071#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Matteo Croce35e015e2017-09-12 17:46:37 +02003072 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3073 idev->cnf.optimistic_dad) &&
David Miller702beb82008-07-20 18:17:02 -07003074 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
Neil Horman95c385b2007-04-25 17:08:10 -07003075 addr_flags |= IFA_F_OPTIMISTIC;
3076#endif
3077
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01003078 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
David Ahernf3d98322017-10-18 09:56:52 -07003079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080 if (!IS_ERR(ifp)) {
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09003081 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
David S. Millercf22f9a2012-04-14 21:37:40 -04003082 addrconf_dad_start(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083 in6_ifa_put(ifp);
3084 }
3085}
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003086EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003088static bool ipv6_reserved_interfaceid(struct in6_addr address)
3089{
3090 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3091 return true;
3092
3093 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3094 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3095 return true;
3096
3097 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3098 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3099 return true;
3100
3101 return false;
3102}
3103
3104static int ipv6_generate_stable_address(struct in6_addr *address,
3105 u8 dad_count,
3106 const struct inet6_dev *idev)
3107{
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003108 static DEFINE_SPINLOCK(lock);
3109 static __u32 digest[SHA_DIGEST_WORDS];
3110 static __u32 workspace[SHA_WORKSPACE_WORDS];
3111
3112 static union {
3113 char __data[SHA_MESSAGE_BYTES];
3114 struct {
3115 struct in6_addr secret;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003116 __be32 prefix[2];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003117 unsigned char hwaddr[MAX_ADDR_LEN];
3118 u8 dad_count;
3119 } __packed;
3120 } data;
3121
3122 struct in6_addr secret;
3123 struct in6_addr temp;
3124 struct net *net = dev_net(idev->dev);
3125
3126 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3127
3128 if (idev->cnf.stable_secret.initialized)
3129 secret = idev->cnf.stable_secret.secret;
3130 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3131 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3132 else
3133 return -1;
3134
3135retry:
3136 spin_lock_bh(&lock);
3137
3138 sha_init(digest);
3139 memset(&data, 0, sizeof(data));
3140 memset(workspace, 0, sizeof(workspace));
3141 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003142 data.prefix[0] = address->s6_addr32[0];
3143 data.prefix[1] = address->s6_addr32[1];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003144 data.secret = secret;
3145 data.dad_count = dad_count;
3146
3147 sha_transform(digest, data.__data, workspace);
3148
3149 temp = *address;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003150 temp.s6_addr32[2] = (__force __be32)digest[0];
3151 temp.s6_addr32[3] = (__force __be32)digest[1];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003152
3153 spin_unlock_bh(&lock);
3154
3155 if (ipv6_reserved_interfaceid(temp)) {
3156 dad_count++;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01003157 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003158 return -1;
3159 goto retry;
3160 }
3161
3162 *address = temp;
3163 return 0;
3164}
3165
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003166static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3167{
3168 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3169
3170 if (s->initialized)
3171 return;
3172 s = &idev->cnf.stable_secret;
3173 get_random_bytes(&s->secret, sizeof(s->secret));
3174 s->initialized = true;
3175}
3176
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003177static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3178{
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003179 struct in6_addr addr;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003180
David Ahernca254492015-10-12 11:47:10 -07003181 /* no link local addresses on L3 master devices */
3182 if (netif_is_l3_master(idev->dev))
3183 return;
3184
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003185 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3186
Felix Jiad35a00b2017-01-26 16:59:17 +13003187 switch (idev->cnf.addr_gen_mode) {
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003188 case IN6_ADDR_GEN_MODE_RANDOM:
3189 ipv6_gen_mode_random_init(idev);
3190 /* fallthrough */
3191 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003192 if (!ipv6_generate_stable_address(&addr, 0, idev))
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003193 addrconf_add_linklocal(idev, &addr,
3194 IFA_F_STABLE_PRIVACY);
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003195 else if (prefix_route)
3196 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003197 break;
3198 case IN6_ADDR_GEN_MODE_EUI64:
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003199 /* addrconf_add_linklocal also adds a prefix_route and we
3200 * only need to care about prefix routes if ipv6_generate_eui64
3201 * couldn't generate one.
3202 */
3203 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003204 addrconf_add_linklocal(idev, &addr, 0);
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003205 else if (prefix_route)
3206 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003207 break;
3208 case IN6_ADDR_GEN_MODE_NONE:
3209 default:
3210 /* will not add any link local address */
3211 break;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003212 }
3213}
3214
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215static void addrconf_dev_config(struct net_device *dev)
3216{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003217 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003218
3219 ASSERT_RTNL();
3220
Herbert Xu74235a22007-06-14 13:02:55 -07003221 if ((dev->type != ARPHRD_ETHER) &&
3222 (dev->type != ARPHRD_FDDI) &&
Herbert Xu74235a22007-06-14 13:02:55 -07003223 (dev->type != ARPHRD_ARCNET) &&
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00003224 (dev->type != ARPHRD_INFINIBAND) &&
Nicolas Dichtele8377352013-08-20 12:16:06 +02003225 (dev->type != ARPHRD_IEEE1394) &&
Jukka Rissanene74bccb82013-12-11 17:05:36 +02003226 (dev->type != ARPHRD_TUNNEL6) &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003227 (dev->type != ARPHRD_6LOWPAN) &&
Felix Jia45ce0fd2017-01-26 16:59:18 +13003228 (dev->type != ARPHRD_IP6GRE) &&
3229 (dev->type != ARPHRD_IPGRE) &&
3230 (dev->type != ARPHRD_TUNNEL) &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003231 (dev->type != ARPHRD_NONE)) {
Herbert Xu74235a22007-06-14 13:02:55 -07003232 /* Alas, we support only Ethernet autoconfiguration. */
3233 return;
3234 }
3235
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236 idev = addrconf_add_dev(dev);
Brian Haley64e724f2010-07-20 10:34:30 +00003237 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003238 return;
3239
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003240 /* this device type has no EUI support */
3241 if (dev->type == ARPHRD_NONE &&
Felix Jiad35a00b2017-01-26 16:59:17 +13003242 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3243 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003244
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003245 addrconf_addr_gen(idev, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003246}
3247
Amerigo Wang07a93622012-10-29 16:23:10 +00003248#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249static void addrconf_sit_config(struct net_device *dev)
3250{
3251 struct inet6_dev *idev;
3252
3253 ASSERT_RTNL();
3254
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003255 /*
3256 * Configure the tunnel with one of our IPv4
3257 * addresses... we should configure all of
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258 * our v4 addrs in the tunnel
3259 */
3260
Ian Morrise5d08d72014-11-23 21:28:43 +00003261 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003262 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003263 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003264 return;
3265 }
3266
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003267 if (dev->priv_flags & IFF_ISATAP) {
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003268 addrconf_addr_gen(idev, false);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003269 return;
3270 }
3271
Linus Torvalds1da177e2005-04-16 15:20:36 -07003272 sit_add_v4_addrs(idev);
3273
Nicolas Dichtel62b54dd2012-10-01 23:19:14 +00003274 if (dev->flags&IFF_POINTOPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003275 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003276}
Joerg Roedel0be669b2006-10-10 14:49:53 -07003277#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003278
Amerigo Wang07a93622012-10-29 16:23:10 +00003279#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003280static void addrconf_gre_config(struct net_device *dev)
3281{
3282 struct inet6_dev *idev;
stephen hemmingeraee80b52011-06-08 10:44:30 +00003283
stephen hemmingeraee80b52011-06-08 10:44:30 +00003284 ASSERT_RTNL();
3285
Ian Morrise5d08d72014-11-23 21:28:43 +00003286 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003287 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003288 pr_debug("%s: add_dev failed\n", __func__);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003289 return;
3290 }
3291
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003292 addrconf_addr_gen(idev, true);
Hannes Frederic Sowad9e4ce62015-10-08 18:19:39 +02003293 if (dev->flags & IFF_POINTOPOINT)
3294 addrconf_add_mroute(dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003295}
3296#endif
3297
David Ahernf1705ec2016-02-24 09:25:37 -08003298static int fixup_permanent_addr(struct inet6_dev *idev,
3299 struct inet6_ifaddr *ifp)
3300{
Ido Schimmelfc882fc2017-08-03 13:28:24 +02003301 /* !rt6i_node means the host route was removed from the
David Ahern8048ced2017-04-25 09:17:29 -07003302 * FIB, for example, if 'lo' device is taken down. In that
3303 * case regenerate the host route.
3304 */
Ido Schimmelfc882fc2017-08-03 13:28:24 +02003305 if (!ifp->rt || !ifp->rt->rt6i_node) {
David Ahern8048ced2017-04-25 09:17:29 -07003306 struct rt6_info *rt, *prev;
David Ahernf1705ec2016-02-24 09:25:37 -08003307
3308 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
Tobias Klauser63a4e802017-09-26 11:22:31 +02003309 if (IS_ERR(rt))
David Ahernf1705ec2016-02-24 09:25:37 -08003310 return PTR_ERR(rt);
3311
David Ahern8048ced2017-04-25 09:17:29 -07003312 /* ifp->rt can be accessed outside of rtnl */
3313 spin_lock(&ifp->lock);
3314 prev = ifp->rt;
David Ahernf1705ec2016-02-24 09:25:37 -08003315 ifp->rt = rt;
David Ahern8048ced2017-04-25 09:17:29 -07003316 spin_unlock(&ifp->lock);
3317
3318 ip6_rt_put(prev);
David Ahernf1705ec2016-02-24 09:25:37 -08003319 }
3320
3321 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3322 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3323 idev->dev, 0, 0);
3324 }
3325
David Ahern6d717132017-05-02 14:43:44 -07003326 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3327 addrconf_dad_start(ifp);
David Ahernf1705ec2016-02-24 09:25:37 -08003328
3329 return 0;
3330}
3331
3332static void addrconf_permanent_addr(struct net_device *dev)
3333{
3334 struct inet6_ifaddr *ifp, *tmp;
3335 struct inet6_dev *idev;
3336
3337 idev = __in6_dev_get(dev);
3338 if (!idev)
3339 return;
3340
3341 write_lock_bh(&idev->lock);
3342
3343 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3344 if ((ifp->flags & IFA_F_PERMANENT) &&
3345 fixup_permanent_addr(idev, ifp) < 0) {
3346 write_unlock_bh(&idev->lock);
3347 ipv6_del_addr(ifp);
3348 write_lock_bh(&idev->lock);
3349
3350 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3351 idev->dev->name, &ifp->addr);
3352 }
3353 }
3354
3355 write_unlock_bh(&idev->lock);
3356}
3357
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003358static int addrconf_notify(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +00003359 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360{
Jiri Pirko351638e2013-05-28 01:30:21 +00003361 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
David Ahern4f7f34e2016-04-07 11:10:41 -07003362 struct netdev_notifier_changeupper_info *info;
Eric Dumazet748e2d92012-08-22 21:50:59 +00003363 struct inet6_dev *idev = __in6_dev_get(dev);
WANG Cong60abc0b2017-06-21 14:34:58 -07003364 struct net *net = dev_net(dev);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003365 int run_pending = 0;
Herbert Xub217d612007-07-30 17:04:52 -07003366 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003367
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003368 switch (event) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003369 case NETDEV_REGISTER:
Herbert Xu74235a22007-06-14 13:02:55 -07003370 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003371 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -07003372 if (IS_ERR(idev))
3373 return notifier_from_errno(PTR_ERR(idev));
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003374 }
3375 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003376
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003377 case NETDEV_CHANGEMTU:
3378 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3379 if (dev->mtu < IPV6_MIN_MTU) {
WANG Cong60abc0b2017-06-21 14:34:58 -07003380 addrconf_ifdown(dev, dev != net->loopback_dev);
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003381 break;
3382 }
3383
3384 if (idev) {
3385 rt6_mtu_change(dev, dev->mtu);
3386 idev->cnf.mtu6 = dev->mtu;
3387 break;
3388 }
3389
3390 /* allocate new idev */
3391 idev = ipv6_add_dev(dev);
3392 if (IS_ERR(idev))
3393 break;
3394
3395 /* device is still not ready */
3396 if (!(idev->if_flags & IF_READY))
3397 break;
3398
3399 run_pending = 1;
3400
3401 /* fall through */
3402
Linus Torvalds1da177e2005-04-16 15:20:36 -07003403 case NETDEV_UP:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003404 case NETDEV_CHANGE:
Jay Vosburghc2edacf2007-07-09 10:42:47 -07003405 if (dev->flags & IFF_SLAVE)
3406 break;
3407
WANG Cong3ce62a82014-09-11 15:07:16 -07003408 if (idev && idev->cnf.disable_ipv6)
3409 break;
3410
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003411 if (event == NETDEV_UP) {
David Ahern38bd10c2016-04-21 20:56:12 -07003412 /* restore routes for permanent addresses */
3413 addrconf_permanent_addr(dev);
3414
Mike Manning1f372c72017-09-25 22:01:36 +01003415 if (!addrconf_link_ready(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003416 /* device is not ready yet. */
Joe Perchesf3213832012-05-15 14:11:53 +00003417 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003418 dev->name);
3419 break;
3420 }
Kristian Slavov99081042006-02-08 16:10:53 -08003421
Evgeniy Polyakovd31c7b82007-11-30 23:36:08 +11003422 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3423 idev = ipv6_add_dev(dev);
3424
WANG Conga317a2f2014-07-25 15:25:09 -07003425 if (!IS_ERR_OR_NULL(idev)) {
Kristian Slavov99081042006-02-08 16:10:53 -08003426 idev->if_flags |= IF_READY;
Benjamin Therye3ec6cf2008-11-05 01:43:57 -08003427 run_pending = 1;
3428 }
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003429 } else if (event == NETDEV_CHANGE) {
Mike Manning1f372c72017-09-25 22:01:36 +01003430 if (!addrconf_link_ready(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003431 /* device is still not ready. */
3432 break;
3433 }
3434
3435 if (idev) {
Linus Lüssinga088d1d2017-02-03 08:11:03 +01003436 if (idev->if_flags & IF_READY) {
3437 /* device is already configured -
3438 * but resend MLD reports, we might
3439 * have roamed and need to update
3440 * multicast snooping switches
3441 */
3442 ipv6_mc_up(idev);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003443 break;
Linus Lüssinga088d1d2017-02-03 08:11:03 +01003444 }
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003445 idev->if_flags |= IF_READY;
3446 }
3447
Joe Perchesf3213832012-05-15 14:11:53 +00003448 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3449 dev->name);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003450
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003451 run_pending = 1;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003452 }
3453
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003454 switch (dev->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +00003455#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003456 case ARPHRD_SIT:
3457 addrconf_sit_config(dev);
3458 break;
Joerg Roedel0be669b2006-10-10 14:49:53 -07003459#endif
Amerigo Wang07a93622012-10-29 16:23:10 +00003460#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003461 case ARPHRD_IPGRE:
3462 addrconf_gre_config(dev);
3463 break;
3464#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003465 case ARPHRD_LOOPBACK:
3466 init_loopback(dev);
3467 break;
3468
3469 default:
3470 addrconf_dev_config(dev);
3471 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003472 }
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003473
WANG Conga317a2f2014-07-25 15:25:09 -07003474 if (!IS_ERR_OR_NULL(idev)) {
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003475 if (run_pending)
3476 addrconf_dad_run(idev);
3477
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003478 /*
3479 * If the MTU changed during the interface down,
3480 * when the interface up, the changed MTU must be
3481 * reflected in the idev as well as routers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003482 */
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003483 if (idev->cnf.mtu6 != dev->mtu &&
3484 dev->mtu >= IPV6_MIN_MTU) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003485 rt6_mtu_change(dev, dev->mtu);
3486 idev->cnf.mtu6 = dev->mtu;
3487 }
3488 idev->tstamp = jiffies;
3489 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003490
3491 /*
3492 * If the changed mtu during down is lower than
3493 * IPV6_MIN_MTU stop IPv6 on this interface.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003494 */
3495 if (dev->mtu < IPV6_MIN_MTU)
WANG Cong60abc0b2017-06-21 14:34:58 -07003496 addrconf_ifdown(dev, dev != net->loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003497 }
3498 break;
3499
Linus Torvalds1da177e2005-04-16 15:20:36 -07003500 case NETDEV_DOWN:
3501 case NETDEV_UNREGISTER:
3502 /*
3503 * Remove all addresses from this interface.
3504 */
3505 addrconf_ifdown(dev, event != NETDEV_DOWN);
3506 break;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003507
Linus Torvalds1da177e2005-04-16 15:20:36 -07003508 case NETDEV_CHANGENAME:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003509 if (idev) {
Stephen Hemminger5632c512007-04-28 21:16:39 -07003510 snmp6_unregister_dev(idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003511 addrconf_sysctl_unregister(idev);
WANG Conga317a2f2014-07-25 15:25:09 -07003512 err = addrconf_sysctl_register(idev);
Herbert Xub217d612007-07-30 17:04:52 -07003513 if (err)
3514 return notifier_from_errno(err);
WANG Conga317a2f2014-07-25 15:25:09 -07003515 err = snmp6_register_dev(idev);
3516 if (err) {
3517 addrconf_sysctl_unregister(idev);
3518 return notifier_from_errno(err);
3519 }
Stephen Hemminger5632c512007-04-28 21:16:39 -07003520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003521 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003522
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003523 case NETDEV_PRE_TYPE_CHANGE:
3524 case NETDEV_POST_TYPE_CHANGE:
Andrew Lunn3ef09522015-12-03 21:12:32 +01003525 if (idev)
3526 addrconf_type_change(dev, event);
Moni Shoua75c78502009-09-15 02:37:40 -07003527 break;
David Ahern4f7f34e2016-04-07 11:10:41 -07003528
3529 case NETDEV_CHANGEUPPER:
3530 info = ptr;
3531
3532 /* flush all routes if dev is linked to or unlinked from
3533 * an L3 master device (e.g., VRF)
3534 */
3535 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3536 addrconf_ifdown(dev, 0);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003537 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003538
3539 return NOTIFY_OK;
3540}
3541
3542/*
3543 * addrconf module should be notified of a device going up
3544 */
3545static struct notifier_block ipv6_dev_notf = {
3546 .notifier_call = addrconf_notify,
WANG Cong242d3a42017-05-08 10:12:13 -07003547 .priority = ADDRCONF_NOTIFY_PRIORITY,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003548};
3549
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003550static void addrconf_type_change(struct net_device *dev, unsigned long event)
Moni Shoua75c78502009-09-15 02:37:40 -07003551{
3552 struct inet6_dev *idev;
3553 ASSERT_RTNL();
3554
3555 idev = __in6_dev_get(dev);
3556
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003557 if (event == NETDEV_POST_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003558 ipv6_mc_remap(idev);
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003559 else if (event == NETDEV_PRE_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003560 ipv6_mc_unmap(idev);
3561}
3562
David Ahern70af9212016-04-08 12:01:21 -07003563static bool addr_is_local(const struct in6_addr *addr)
3564{
3565 return ipv6_addr_type(addr) &
3566 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3567}
3568
Linus Torvalds1da177e2005-04-16 15:20:36 -07003569static int addrconf_ifdown(struct net_device *dev, int how)
3570{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09003571 struct net *net = dev_net(dev);
stephen hemminger502a2ff2010-03-17 20:31:13 +00003572 struct inet6_dev *idev;
David Ahernf1705ec2016-02-24 09:25:37 -08003573 struct inet6_ifaddr *ifa, *tmp;
David Ahernf1705ec2016-02-24 09:25:37 -08003574 int _keep_addr;
3575 bool keep_addr;
David S. Miller73a8bd72011-01-23 23:27:15 -08003576 int state, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003577
3578 ASSERT_RTNL();
3579
David S. Miller73a8bd72011-01-23 23:27:15 -08003580 rt6_ifdown(net, dev);
3581 neigh_ifdown(&nd_tbl, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003582
3583 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003584 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003585 return -ENODEV;
3586
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003587 /*
3588 * Step 1: remove reference to ipv6 device from parent device.
3589 * Do not dev_put!
Linus Torvalds1da177e2005-04-16 15:20:36 -07003590 */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003591 if (how) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003592 idev->dead = 1;
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07003593
3594 /* protected by rtnl_lock */
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003595 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596
3597 /* Step 1.5: remove snmp6 entry */
3598 snmp6_unregister_dev(idev);
3599
3600 }
3601
David Ahernf1705ec2016-02-24 09:25:37 -08003602 /* aggregate the system setting and interface setting */
3603 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3604 if (!_keep_addr)
3605 _keep_addr = idev->cnf.keep_addr_on_down;
3606
3607 /* combine the user config with event to determine if permanent
3608 * addresses are to be removed from address hash table
3609 */
Mike Manningbc561632016-08-12 12:02:38 +01003610 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003611
David S. Miller73a8bd72011-01-23 23:27:15 -08003612 /* Step 2: clear hash table */
3613 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3614 struct hlist_head *h = &inet6_addr_lst[i];
David S. Miller73a8bd72011-01-23 23:27:15 -08003615
3616 spin_lock_bh(&addrconf_hash_lock);
Ian Morris67ba4152014-08-24 21:53:10 +01003617restart:
Sasha Levinb67bfe02013-02-27 17:06:00 -08003618 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
David S. Miller73a8bd72011-01-23 23:27:15 -08003619 if (ifa->idev == idev) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003620 addrconf_del_dad_work(ifa);
David Ahernf1705ec2016-02-24 09:25:37 -08003621 /* combined flag + permanent flag decide if
3622 * address is retained on a down event
3623 */
3624 if (!keep_addr ||
David Ahern70af9212016-04-08 12:01:21 -07003625 !(ifa->flags & IFA_F_PERMANENT) ||
3626 addr_is_local(&ifa->addr)) {
David Ahernf1705ec2016-02-24 09:25:37 -08003627 hlist_del_init_rcu(&ifa->addr_lst);
3628 goto restart;
3629 }
David S. Miller73a8bd72011-01-23 23:27:15 -08003630 }
3631 }
3632 spin_unlock_bh(&addrconf_hash_lock);
3633 }
3634
Linus Torvalds1da177e2005-04-16 15:20:36 -07003635 write_lock_bh(&idev->lock);
3636
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003637 addrconf_del_rs_timer(idev);
3638
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003639 /* Step 2: clear flags for stateless addrconf */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003640 if (!how)
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003641 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003642
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003643 /* Step 3: clear tempaddr list */
stephen hemminger372e6c82010-03-17 20:31:09 +00003644 while (!list_empty(&idev->tempaddr_list)) {
3645 ifa = list_first_entry(&idev->tempaddr_list,
3646 struct inet6_ifaddr, tmp_list);
3647 list_del(&ifa->tmp_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003648 write_unlock_bh(&idev->lock);
3649 spin_lock_bh(&ifa->lock);
3650
3651 if (ifa->ifpub) {
3652 in6_ifa_put(ifa->ifpub);
3653 ifa->ifpub = NULL;
3654 }
3655 spin_unlock_bh(&ifa->lock);
3656 in6_ifa_put(ifa);
3657 write_lock_bh(&idev->lock);
3658 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003659
David Ahernf1705ec2016-02-24 09:25:37 -08003660 /* re-combine the user config with event to determine if permanent
3661 * addresses are to be removed from the interface list
3662 */
Mike Manningbc561632016-08-12 12:02:38 +01003663 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003664
David Ahernf1705ec2016-02-24 09:25:37 -08003665 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
David Ahern38bd10c2016-04-21 20:56:12 -07003666 struct rt6_info *rt = NULL;
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003667 bool keep;
David Ahern38bd10c2016-04-21 20:56:12 -07003668
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003669 addrconf_del_dad_work(ifa);
stephen hemminger84e8b802010-03-02 13:32:46 +00003670
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003671 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3672 !addr_is_local(&ifa->addr);
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003673
David S. Miller73a8bd72011-01-23 23:27:15 -08003674 write_unlock_bh(&idev->lock);
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003675 spin_lock_bh(&ifa->lock);
David Ahernf1705ec2016-02-24 09:25:37 -08003676
Rabin Vincenta2d6cbb2017-04-10 08:36:39 +02003677 if (keep) {
David Ahernf1705ec2016-02-24 09:25:37 -08003678 /* set state to skip the notifier below */
3679 state = INET6_IFADDR_STATE_DEAD;
David Ahern6d717132017-05-02 14:43:44 -07003680 ifa->state = INET6_IFADDR_STATE_PREDAD;
David Ahernf1705ec2016-02-24 09:25:37 -08003681 if (!(ifa->flags & IFA_F_NODAD))
3682 ifa->flags |= IFA_F_TENTATIVE;
David Ahern38bd10c2016-04-21 20:56:12 -07003683
3684 rt = ifa->rt;
3685 ifa->rt = NULL;
David Ahernf1705ec2016-02-24 09:25:37 -08003686 } else {
3687 state = ifa->state;
3688 ifa->state = INET6_IFADDR_STATE_DEAD;
David Ahernf1705ec2016-02-24 09:25:37 -08003689 }
3690
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003691 spin_unlock_bh(&ifa->lock);
stephen hemminger84e8b802010-03-02 13:32:46 +00003692
David Ahern38bd10c2016-04-21 20:56:12 -07003693 if (rt)
3694 ip6_del_rt(rt);
3695
David S. Miller73a8bd72011-01-23 23:27:15 -08003696 if (state != INET6_IFADDR_STATE_DEAD) {
3697 __ipv6_ifa_notify(RTM_DELADDR, ifa);
Cong Wangf88c91d2013-04-14 23:18:43 +08003698 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
Mike Manningea06f712016-07-22 18:32:11 +01003699 } else {
3700 if (idev->cnf.forwarding)
3701 addrconf_leave_anycast(ifa);
3702 addrconf_leave_solict(ifa->idev, &ifa->addr);
stephen hemminger27bdb2a2010-04-12 05:41:32 +00003703 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003704
David S. Miller73a8bd72011-01-23 23:27:15 -08003705 write_lock_bh(&idev->lock);
Eric Dumazet8ef802a2017-10-07 19:30:23 -07003706 if (!keep) {
3707 list_del_rcu(&ifa->if_list);
3708 in6_ifa_put(ifa);
3709 }
David S. Miller73a8bd72011-01-23 23:27:15 -08003710 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003711
Linus Torvalds1da177e2005-04-16 15:20:36 -07003712 write_unlock_bh(&idev->lock);
3713
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003714 /* Step 5: Discard anycast and multicast list */
3715 if (how) {
3716 ipv6_ac_destroy_dev(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003717 ipv6_mc_destroy_dev(idev);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003718 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003719 ipv6_mc_down(idev);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003721
Linus Torvalds1da177e2005-04-16 15:20:36 -07003722 idev->tstamp = jiffies;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003723
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003724 /* Last: Shot the device (if unregistered) */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003725 if (how) {
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003726 addrconf_sysctl_unregister(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003727 neigh_parms_release(&nd_tbl, idev->nd_parms);
3728 neigh_ifdown(&nd_tbl, dev);
3729 in6_dev_put(idev);
3730 }
3731 return 0;
3732}
3733
3734static void addrconf_rs_timer(unsigned long data)
3735{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003736 struct inet6_dev *idev = (struct inet6_dev *)data;
Cong Wangcaf92bc2013-08-31 13:44:32 +08003737 struct net_device *dev = idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003738 struct in6_addr lladdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003739
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003740 write_lock(&idev->lock);
stephen hemminger5b2a1952010-03-02 13:32:45 +00003741 if (idev->dead || !(idev->if_flags & IF_READY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003742 goto out;
3743
Shmulik Ladkani9ba2add2012-12-02 01:44:53 +00003744 if (!ipv6_accept_ra(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003745 goto out;
stephen hemminger5b2a1952010-03-02 13:32:45 +00003746
3747 /* Announcement received after solicitation was sent */
3748 if (idev->if_flags & IF_RA_RCVD)
3749 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003750
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003751 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
Cong Wangcaf92bc2013-08-31 13:44:32 +08003752 write_unlock(&idev->lock);
3753 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3754 ndisc_send_rs(dev, &lladdr,
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003755 &in6addr_linklocal_allrouters);
3756 else
Cong Wangcaf92bc2013-08-31 13:44:32 +08003757 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003758
Cong Wangcaf92bc2013-08-31 13:44:32 +08003759 write_lock(&idev->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003760 idev->rs_interval = rfc3315_s14_backoff_update(
3761 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003762 /* The wait after the last probe can be shorter */
3763 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3764 idev->cnf.rtr_solicits) ?
3765 idev->cnf.rtr_solicit_delay :
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003766 idev->rs_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003767 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003768 /*
3769 * Note: we do not support deprecated "all on-link"
3770 * assumption any longer.
3771 */
Joe Perches91df42b2012-05-15 14:11:54 +00003772 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003773 }
3774
3775out:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003776 write_unlock(&idev->lock);
Cong Wangcaf92bc2013-08-31 13:44:32 +08003777put:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003778 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003779}
3780
3781/*
3782 * Duplicate Address Detection
3783 */
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003784static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3785{
3786 unsigned long rand_num;
3787 struct inet6_dev *idev = ifp->idev;
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003788 u64 nonce;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003789
Neil Horman95c385b2007-04-25 17:08:10 -07003790 if (ifp->flags & IFA_F_OPTIMISTIC)
3791 rand_num = 0;
3792 else
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003793 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
Neil Horman95c385b2007-04-25 17:08:10 -07003794
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003795 nonce = 0;
3796 if (idev->cnf.enhanced_dad ||
3797 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3798 do
3799 get_random_bytes(&nonce, 6);
3800 while (nonce == 0);
3801 }
3802 ifp->dad_nonce = nonce;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003803 ifp->dad_probes = idev->cnf.dad_transmits;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003804 addrconf_mod_dad_work(ifp, rand_num);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003805}
3806
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003807static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003808{
3809 struct inet6_dev *idev = ifp->idev;
3810 struct net_device *dev = idev->dev;
Paolo Abeni764d3be2016-11-22 16:57:40 +01003811 bool bump_id, notify = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003812
3813 addrconf_join_solict(dev, &ifp->addr);
3814
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003815 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003816
3817 read_lock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003818 spin_lock(&ifp->lock);
Herbert Xue9d3e082010-05-18 15:36:06 -07003819 if (ifp->state == INET6_IFADDR_STATE_DEAD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003820 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003821
3822 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
Matteo Crocea2d3f3e2017-10-05 19:03:05 +02003823 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3824 idev->cnf.accept_dad < 1) ||
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07003825 !(ifp->flags&IFA_F_TENTATIVE) ||
3826 ifp->flags & IFA_F_NODAD) {
Paolo Abeni764d3be2016-11-22 16:57:40 +01003827 bump_id = ifp->flags & IFA_F_TENTATIVE;
Brian Haleycc411d02009-09-09 14:41:32 +00003828 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003829 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003830 read_unlock_bh(&idev->lock);
3831
Paolo Abeni764d3be2016-11-22 16:57:40 +01003832 addrconf_dad_completed(ifp, bump_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003833 return;
3834 }
3835
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003836 if (!(idev->if_flags & IF_READY)) {
stephen hemminger21809fa2010-02-08 19:48:52 +00003837 spin_unlock(&ifp->lock);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003838 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003839 /*
Masatake YAMATO590a9882009-06-09 10:41:12 +09003840 * If the device is not ready:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003841 * - keep it tentative if it is a permanent address.
3842 * - otherwise, kill it.
3843 */
3844 in6_ifa_hold(ifp);
Brian Haleycc411d02009-09-09 14:41:32 +00003845 addrconf_dad_stop(ifp, 0);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003846 return;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003847 }
Neil Horman95c385b2007-04-25 17:08:10 -07003848
3849 /*
3850 * Optimistic nodes can start receiving
3851 * Frames right away
3852 */
Erik Kline7fd25612014-10-28 18:11:14 +09003853 if (ifp->flags & IFA_F_OPTIMISTIC) {
Neil Horman95c385b2007-04-25 17:08:10 -07003854 ip6_ins_rt(ifp->rt);
Matteo Croce35e015e2017-09-12 17:46:37 +02003855 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
Erik Kline7fd25612014-10-28 18:11:14 +09003856 /* Because optimistic nodes can use this address,
3857 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3858 */
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003859 notify = true;
Erik Kline7fd25612014-10-28 18:11:14 +09003860 }
3861 }
Neil Horman95c385b2007-04-25 17:08:10 -07003862
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003863 addrconf_dad_kick(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003864out:
Herbert Xu622ccdf2010-05-18 15:56:06 -07003865 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003866 read_unlock_bh(&idev->lock);
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003867 if (notify)
3868 ipv6_ifa_notify(RTM_NEWADDR, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003869}
3870
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003871static void addrconf_dad_start(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003872{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003873 bool begin_dad = false;
3874
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003875 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003876 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3877 ifp->state = INET6_IFADDR_STATE_PREDAD;
3878 begin_dad = true;
3879 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003880 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003881
3882 if (begin_dad)
3883 addrconf_mod_dad_work(ifp, 0);
3884}
3885
3886static void addrconf_dad_work(struct work_struct *w)
3887{
3888 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3889 struct inet6_ifaddr,
3890 dad_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003891 struct inet6_dev *idev = ifp->idev;
Paolo Abeni764d3be2016-11-22 16:57:40 +01003892 bool bump_id, disable_ipv6 = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003893 struct in6_addr mcaddr;
3894
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003895 enum {
3896 DAD_PROCESS,
3897 DAD_BEGIN,
3898 DAD_ABORT,
3899 } action = DAD_PROCESS;
3900
3901 rtnl_lock();
3902
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003903 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003904 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3905 action = DAD_BEGIN;
3906 ifp->state = INET6_IFADDR_STATE_DAD;
3907 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3908 action = DAD_ABORT;
3909 ifp->state = INET6_IFADDR_STATE_POSTDAD;
Mike Manning85b51b12016-08-18 14:39:40 +01003910
Matteo Croce35e015e2017-09-12 17:46:37 +02003911 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3912 idev->cnf.accept_dad > 1) &&
3913 !idev->cnf.disable_ipv6 &&
Mike Manning85b51b12016-08-18 14:39:40 +01003914 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3915 struct in6_addr addr;
3916
3917 addr.s6_addr32[0] = htonl(0xfe800000);
3918 addr.s6_addr32[1] = 0;
3919
3920 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3921 ipv6_addr_equal(&ifp->addr, &addr)) {
3922 /* DAD failed for link-local based on MAC */
3923 idev->cnf.disable_ipv6 = 1;
3924
3925 pr_info("%s: IPv6 being disabled!\n",
3926 ifp->idev->dev->name);
3927 disable_ipv6 = true;
3928 }
3929 }
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003930 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003931 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003932
3933 if (action == DAD_BEGIN) {
3934 addrconf_dad_begin(ifp);
3935 goto out;
3936 } else if (action == DAD_ABORT) {
Wei Yongjun751eb6b2016-09-05 16:06:31 +08003937 in6_ifa_hold(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003938 addrconf_dad_stop(ifp, 1);
Mike Manning85b51b12016-08-18 14:39:40 +01003939 if (disable_ipv6)
3940 addrconf_ifdown(idev->dev, 0);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003941 goto out;
3942 }
3943
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003944 if (!ifp->dad_probes && addrconf_dad_end(ifp))
Herbert Xuf2344a12010-05-18 15:55:27 -07003945 goto out;
3946
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003947 write_lock_bh(&idev->lock);
stephen hemminger122e4512010-03-02 13:32:44 +00003948 if (idev->dead || !(idev->if_flags & IF_READY)) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003949 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003950 goto out;
3951 }
stephen hemminger21809fa2010-02-08 19:48:52 +00003952
3953 spin_lock(&ifp->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003954 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3955 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003956 write_unlock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003957 goto out;
3958 }
3959
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003960 if (ifp->dad_probes == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003961 /*
3962 * DAD was successful
3963 */
3964
Paolo Abeni764d3be2016-11-22 16:57:40 +01003965 bump_id = ifp->flags & IFA_F_TENTATIVE;
Brian Haleycc411d02009-09-09 14:41:32 +00003966 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003967 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003968 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003969
Paolo Abeni764d3be2016-11-22 16:57:40 +01003970 addrconf_dad_completed(ifp, bump_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003971
3972 goto out;
3973 }
3974
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003975 ifp->dad_probes--;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003976 addrconf_mod_dad_work(ifp,
3977 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
stephen hemminger21809fa2010-02-08 19:48:52 +00003978 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003979 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003980
3981 /* send a neighbour solicitation for our addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003982 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003983 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3984 ifp->dad_nonce);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003985out:
3986 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003987 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003988}
3989
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003990/* ifp->idev must be at least read locked */
3991static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3992{
3993 struct inet6_ifaddr *ifpiter;
3994 struct inet6_dev *idev = ifp->idev;
3995
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01003996 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3997 if (ifpiter->scope > IFA_LINK)
3998 break;
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003999 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4000 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4001 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4002 IFA_F_PERMANENT)
4003 return false;
4004 }
4005 return true;
4006}
4007
Paolo Abeni764d3be2016-11-22 16:57:40 +01004008static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004009{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004010 struct net_device *dev = ifp->idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004011 struct in6_addr lladdr;
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004012 bool send_rs, send_mld;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004013
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004014 addrconf_del_dad_work(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004015
4016 /*
4017 * Configure the address for reception. Now it is valid.
4018 */
4019
4020 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4021
Tore Anderson026359b2011-08-28 23:47:33 +00004022 /* If added prefix is link local and we are prepared to process
4023 router advertisements, start sending router solicitations.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004024 */
4025
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004026 read_lock_bh(&ifp->idev->lock);
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01004027 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004028 send_rs = send_mld &&
4029 ipv6_accept_ra(ifp->idev) &&
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004030 ifp->idev->cnf.rtr_solicits != 0 &&
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004031 (dev->flags&IFF_LOOPBACK) == 0;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004032 read_unlock_bh(&ifp->idev->lock);
4033
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02004034 /* While dad is in progress mld report's source address is in6_addrany.
4035 * Resend with proper ll now.
4036 */
4037 if (send_mld)
4038 ipv6_mc_dad_complete(ifp->idev);
4039
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004040 if (send_rs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004041 /*
4042 * If a host as already performed a random delay
4043 * [...] as part of DAD [...] there is no need
4044 * to delay again before sending the first RS
4045 */
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004046 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004047 return;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02004048 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004049
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004050 write_lock_bh(&ifp->idev->lock);
4051 spin_lock(&ifp->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004052 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4053 ifp->idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004054 ifp->idev->rs_probes = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004055 ifp->idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004056 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004057 spin_unlock(&ifp->lock);
4058 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004059 }
Paolo Abeni764d3be2016-11-22 16:57:40 +01004060
4061 if (bump_id)
4062 rt_genid_bump_ipv6(dev_net(dev));
Marcus Huewea11a7f72017-02-06 18:34:56 +01004063
4064 /* Make sure that a new temporary address will be created
4065 * before this temporary address becomes deprecated.
4066 */
4067 if (ifp->flags & IFA_F_TEMPORARY)
4068 addrconf_verify_rtnl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004069}
4070
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004071static void addrconf_dad_run(struct inet6_dev *idev)
4072{
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004073 struct inet6_ifaddr *ifp;
4074
4075 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00004076 list_for_each_entry(ifp, &idev->addr_list, if_list) {
stephen hemminger21809fa2010-02-08 19:48:52 +00004077 spin_lock(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07004078 if (ifp->flags & IFA_F_TENTATIVE &&
4079 ifp->state == INET6_IFADDR_STATE_DAD)
4080 addrconf_dad_kick(ifp);
stephen hemminger21809fa2010-02-08 19:48:52 +00004081 spin_unlock(&ifp->lock);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004082 }
4083 read_unlock_bh(&idev->lock);
4084}
4085
Linus Torvalds1da177e2005-04-16 15:20:36 -07004086#ifdef CONFIG_PROC_FS
4087struct if6_iter_state {
Daniel Lezcano3c400902008-01-10 22:42:49 -08004088 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004089 int bucket;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004090 int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004091};
4092
Mihai Maruseac1d578302012-01-03 23:31:35 +00004093static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004094{
4095 struct inet6_ifaddr *ifa = NULL;
4096 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004097 struct net *net = seq_file_net(seq);
Mihai Maruseac1d578302012-01-03 23:31:35 +00004098 int p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004099
Mihai Maruseac1d578302012-01-03 23:31:35 +00004100 /* initial bucket if pos is 0 */
4101 if (pos == 0) {
4102 state->bucket = 0;
4103 state->offset = 0;
4104 }
4105
4106 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08004107 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
Mihai Maruseac1d578302012-01-03 23:31:35 +00004108 addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004109 if (!net_eq(dev_net(ifa->idev->dev), net))
4110 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004111 /* sync with offset */
4112 if (p < state->offset) {
4113 p++;
4114 continue;
4115 }
4116 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004117 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004118 }
4119
4120 /* prepare for next bucket */
4121 state->offset = 0;
4122 p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004123 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004124 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004125}
4126
stephen hemmingerc2e21292010-03-17 20:31:10 +00004127static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4128 struct inet6_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004129{
4130 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004131 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004132
Sasha Levinb67bfe02013-02-27 17:06:00 -08004133 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004134 if (!net_eq(dev_net(ifa->idev->dev), net))
4135 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004136 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004137 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004138 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004139
4140 while (++state->bucket < IN6_ADDR_HSIZE) {
Mihai Maruseac1d578302012-01-03 23:31:35 +00004141 state->offset = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -08004142 hlist_for_each_entry_rcu_bh(ifa,
stephen hemmingerc2e21292010-03-17 20:31:10 +00004143 &inet6_addr_lst[state->bucket], addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004144 if (!net_eq(dev_net(ifa->idev->dev), net))
4145 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004146 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004147 return ifa;
Daniel Lezcano3c400902008-01-10 22:42:49 -08004148 }
4149 }
4150
stephen hemmingerc2e21292010-03-17 20:31:10 +00004151 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004152}
4153
Linus Torvalds1da177e2005-04-16 15:20:36 -07004154static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004155 __acquires(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004156{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004157 rcu_read_lock_bh();
Mihai Maruseac1d578302012-01-03 23:31:35 +00004158 return if6_get_first(seq, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004159}
4160
4161static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4162{
4163 struct inet6_ifaddr *ifa;
4164
4165 ifa = if6_get_next(seq, v);
4166 ++*pos;
4167 return ifa;
4168}
4169
4170static void if6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004171 __releases(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004172{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004173 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004174}
4175
4176static int if6_seq_show(struct seq_file *seq, void *v)
4177{
4178 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
Jiri Pirko971a3512013-12-10 13:56:29 +01004179 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
Harvey Harrisonb0711952008-10-28 16:05:40 -07004180 &ifp->addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004181 ifp->idev->dev->ifindex,
4182 ifp->prefix_len,
4183 ifp->scope,
Jiri Pirko971a3512013-12-10 13:56:29 +01004184 (u8) ifp->flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004185 ifp->idev->dev->name);
4186 return 0;
4187}
4188
Philippe De Muyter56b3d972007-07-10 23:07:31 -07004189static const struct seq_operations if6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004190 .start = if6_seq_start,
4191 .next = if6_seq_next,
4192 .show = if6_seq_show,
4193 .stop = if6_seq_stop,
4194};
4195
4196static int if6_seq_open(struct inode *inode, struct file *file)
4197{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004198 return seq_open_net(inode, file, &if6_seq_ops,
4199 sizeof(struct if6_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004200}
4201
Arjan van de Ven9a321442007-02-12 00:55:35 -08004202static const struct file_operations if6_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004203 .owner = THIS_MODULE,
4204 .open = if6_seq_open,
4205 .read = seq_read,
4206 .llseek = seq_lseek,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004207 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004208};
4209
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004210static int __net_init if6_proc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004211{
Gao fengd4beaa62013-02-18 01:34:54 +00004212 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004213 return -ENOMEM;
4214 return 0;
4215}
4216
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004217static void __net_exit if6_proc_net_exit(struct net *net)
Daniel Lezcano3c400902008-01-10 22:42:49 -08004218{
Gao fengece31ff2013-02-18 01:34:56 +00004219 remove_proc_entry("if_inet6", net->proc_net);
Daniel Lezcano3c400902008-01-10 22:42:49 -08004220}
4221
4222static struct pernet_operations if6_proc_net_ops = {
Ian Morris67ba4152014-08-24 21:53:10 +01004223 .init = if6_proc_net_init,
4224 .exit = if6_proc_net_exit,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004225};
4226
4227int __init if6_proc_init(void)
4228{
4229 return register_pernet_subsys(&if6_proc_net_ops);
4230}
4231
Linus Torvalds1da177e2005-04-16 15:20:36 -07004232void if6_proc_exit(void)
4233{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004234 unregister_pernet_subsys(&if6_proc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004235}
4236#endif /* CONFIG_PROC_FS */
4237
Amerigo Wang07a93622012-10-29 16:23:10 +00004238#if IS_ENABLED(CONFIG_IPV6_MIP6)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004239/* Check if address is a home address configured on any interface. */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00004240int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004241{
4242 int ret = 0;
stephen hemmingerc2e21292010-03-17 20:31:10 +00004243 struct inet6_ifaddr *ifp = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00004244 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00004245
stephen hemminger5c578aed2010-03-17 20:31:11 +00004246 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08004247 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09004248 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano389f6612008-01-10 22:44:40 -08004249 continue;
YOSHIFUJI Hideakicaad2952008-04-10 15:42:07 +09004250 if (ipv6_addr_equal(&ifp->addr, addr) &&
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004251 (ifp->flags & IFA_F_HOMEADDRESS)) {
4252 ret = 1;
4253 break;
4254 }
4255 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00004256 rcu_read_unlock_bh();
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004257 return ret;
4258}
4259#endif
4260
Linus Torvalds1da177e2005-04-16 15:20:36 -07004261/*
4262 * Periodic address status verification
4263 */
4264
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004265static void addrconf_verify_rtnl(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004266{
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004267 unsigned long now, next, next_sec, next_sched;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004268 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004269 int i;
4270
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004271 ASSERT_RTNL();
4272
stephen hemminger5c578aed2010-03-17 20:31:11 +00004273 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004274 now = jiffies;
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004275 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004276
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004277 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004278
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07004279 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004280restart:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004281 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004282 unsigned long age;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004283
Yasushi Asanofad8da32013-12-31 12:04:19 +09004284 /* When setting preferred_lft to a value not zero or
4285 * infinity, while valid_lft is infinity
4286 * IFA_F_PERMANENT has a non-infinity life time.
4287 */
4288 if ((ifp->flags & IFA_F_PERMANENT) &&
4289 (ifp->prefered_lft == INFINITY_LIFE_TIME))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004290 continue;
4291
4292 spin_lock(&ifp->lock);
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004293 /* We try to batch several events at once. */
4294 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004295
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004296 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4297 age >= ifp->valid_lft) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004298 spin_unlock(&ifp->lock);
4299 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004300 ipv6_del_addr(ifp);
4301 goto restart;
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004302 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4303 spin_unlock(&ifp->lock);
4304 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004305 } else if (age >= ifp->prefered_lft) {
Brian Haleya1ed0522009-07-02 07:10:52 +00004306 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004307 int deprecate = 0;
4308
4309 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4310 deprecate = 1;
4311 ifp->flags |= IFA_F_DEPRECATED;
4312 }
4313
Yasushi Asanofad8da32013-12-31 12:04:19 +09004314 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4315 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004316 next = ifp->tstamp + ifp->valid_lft * HZ;
4317
4318 spin_unlock(&ifp->lock);
4319
4320 if (deprecate) {
4321 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004322
4323 ipv6_ifa_notify(0, ifp);
4324 in6_ifa_put(ifp);
4325 goto restart;
4326 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004327 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4328 !(ifp->flags&IFA_F_TENTATIVE)) {
stephen hemminger88949cf2010-03-17 20:31:17 +00004329 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4330 ifp->idev->cnf.dad_transmits *
Jiri Pirko1f9248e2013-12-07 19:26:53 +01004331 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
stephen hemminger88949cf2010-03-17 20:31:17 +00004332
Linus Torvalds1da177e2005-04-16 15:20:36 -07004333 if (age >= ifp->prefered_lft - regen_advance) {
4334 struct inet6_ifaddr *ifpub = ifp->ifpub;
4335 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4336 next = ifp->tstamp + ifp->prefered_lft * HZ;
4337 if (!ifp->regen_count && ifpub) {
4338 ifp->regen_count++;
4339 in6_ifa_hold(ifp);
4340 in6_ifa_hold(ifpub);
4341 spin_unlock(&ifp->lock);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004342
Hiroyuki YAMAMORI291d8092005-12-23 11:24:05 -08004343 spin_lock(&ifpub->lock);
4344 ifpub->regen_count = 0;
4345 spin_unlock(&ifpub->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004346 ipv6_create_tempaddr(ifpub, ifp);
4347 in6_ifa_put(ifpub);
4348 in6_ifa_put(ifp);
4349 goto restart;
4350 }
4351 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4352 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4353 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004354 } else {
4355 /* ifp->prefered_lft <= ifp->valid_lft */
4356 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4357 next = ifp->tstamp + ifp->prefered_lft * HZ;
4358 spin_unlock(&ifp->lock);
4359 }
4360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004361 }
4362
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004363 next_sec = round_jiffies_up(next);
4364 next_sched = next;
4365
4366 /* If rounded timeout is accurate enough, accept it. */
4367 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4368 next_sched = next_sec;
4369
4370 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4371 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4372 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4373
dingtianhongba3542e2013-08-17 10:27:04 +08004374 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4375 now, next, next_sec, next_sched);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004376 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004377 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004378}
4379
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004380static void addrconf_verify_work(struct work_struct *w)
4381{
4382 rtnl_lock();
4383 addrconf_verify_rtnl();
4384 rtnl_unlock();
4385}
4386
4387static void addrconf_verify(void)
4388{
4389 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4390}
4391
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004392static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4393 struct in6_addr **peer_pfx)
Thomas Graf461d8832006-09-18 00:09:49 -07004394{
4395 struct in6_addr *pfx = NULL;
4396
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004397 *peer_pfx = NULL;
4398
Thomas Graf461d8832006-09-18 00:09:49 -07004399 if (addr)
4400 pfx = nla_data(addr);
4401
4402 if (local) {
4403 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004404 *peer_pfx = pfx;
4405 pfx = nla_data(local);
Thomas Graf461d8832006-09-18 00:09:49 -07004406 }
4407
4408 return pfx;
4409}
4410
Patrick McHardyef7c79e2007-06-05 12:38:30 -07004411static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
Thomas Graf461d8832006-09-18 00:09:49 -07004412 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4413 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4414 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
Jiri Pirko479840f2013-12-06 09:45:21 +01004415 [IFA_FLAGS] = { .len = sizeof(u32) },
Thomas Graf461d8832006-09-18 00:09:49 -07004416};
4417
Linus Torvalds1da177e2005-04-16 15:20:36 -07004418static int
David Ahernc21ef3e2017-04-16 09:48:24 -07004419inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4420 struct netlink_ext_ack *extack)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004421{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004422 struct net *net = sock_net(skb->sk);
Thomas Grafb933f712006-09-18 00:10:19 -07004423 struct ifaddrmsg *ifm;
4424 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004425 struct in6_addr *pfx, *peer_pfx;
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004426 u32 ifa_flags;
Thomas Grafb933f712006-09-18 00:10:19 -07004427 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004428
Johannes Bergfceb6432017-04-12 14:34:07 +02004429 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
David Ahernc21ef3e2017-04-16 09:48:24 -07004430 extack);
Thomas Grafb933f712006-09-18 00:10:19 -07004431 if (err < 0)
4432 return err;
4433
4434 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004435 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004436 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004437 return -EINVAL;
4438
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004439 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4440
4441 /* We ignore other flags so far. */
4442 ifa_flags &= IFA_F_MANAGETEMPADDR;
4443
4444 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4445 ifm->ifa_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004446}
4447
Jiri Pirko479840f2013-12-06 09:45:21 +01004448static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004449 u32 prefered_lft, u32 valid_lft)
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004450{
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004451 u32 flags;
4452 clock_t expires;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004453 unsigned long timeout;
Jiri Pirko53bd6742013-12-06 09:45:22 +01004454 bool was_managetempaddr;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004455 bool had_prefixroute;
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09004456
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004457 ASSERT_RTNL();
4458
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004459 if (!valid_lft || (prefered_lft > valid_lft))
4460 return -EINVAL;
4461
Jiri Pirko53bd6742013-12-06 09:45:22 +01004462 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4463 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4464 return -EINVAL;
4465
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004466 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4467 if (addrconf_finite_timeout(timeout)) {
4468 expires = jiffies_to_clock_t(timeout * HZ);
4469 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004470 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004471 } else {
4472 expires = 0;
4473 flags = 0;
4474 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004475 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004476
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004477 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4478 if (addrconf_finite_timeout(timeout)) {
4479 if (timeout == 0)
4480 ifa_flags |= IFA_F_DEPRECATED;
4481 prefered_lft = timeout;
4482 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004483
4484 spin_lock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004485 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004486 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4487 !(ifp->flags & IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004488 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
Thomas Haller761aac72014-01-15 15:36:58 +01004489 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4490 IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004491 ifp->flags |= ifa_flags;
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004492 ifp->tstamp = jiffies;
4493 ifp->valid_lft = valid_lft;
4494 ifp->prefered_lft = prefered_lft;
4495
4496 spin_unlock_bh(&ifp->lock);
4497 if (!(ifp->flags&IFA_F_TENTATIVE))
4498 ipv6_ifa_notify(0, ifp);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004499
Thomas Haller761aac72014-01-15 15:36:58 +01004500 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4501 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4502 expires, flags);
Thomas Haller5b84efe2014-01-15 15:36:59 +01004503 } else if (had_prefixroute) {
4504 enum cleanup_prefix_rt_t action;
4505 unsigned long rt_expires;
4506
4507 write_lock_bh(&ifp->idev->lock);
4508 action = check_cleanup_prefix_route(ifp, &rt_expires);
4509 write_unlock_bh(&ifp->idev->lock);
4510
4511 if (action != CLEANUP_PREFIX_RT_NOP) {
4512 cleanup_prefix_route(ifp, rt_expires,
4513 action == CLEANUP_PREFIX_RT_DEL);
4514 }
Thomas Haller761aac72014-01-15 15:36:58 +01004515 }
Jiri Pirko53bd6742013-12-06 09:45:22 +01004516
4517 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4518 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4519 valid_lft = prefered_lft = 0;
4520 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4521 !was_managetempaddr, jiffies);
4522 }
4523
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004524 addrconf_verify_rtnl();
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004525
4526 return 0;
4527}
4528
4529static int
David Ahernc21ef3e2017-04-16 09:48:24 -07004530inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4531 struct netlink_ext_ack *extack)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004532{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004533 struct net *net = sock_net(skb->sk);
Thomas Graf461d8832006-09-18 00:09:49 -07004534 struct ifaddrmsg *ifm;
4535 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004536 struct in6_addr *pfx, *peer_pfx;
Thomas Graf7198f8c2006-09-18 00:13:46 -07004537 struct inet6_ifaddr *ifa;
4538 struct net_device *dev;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004539 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
Jiri Pirko479840f2013-12-06 09:45:21 +01004540 u32 ifa_flags;
Thomas Graf461d8832006-09-18 00:09:49 -07004541 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004542
Johannes Bergfceb6432017-04-12 14:34:07 +02004543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
David Ahernc21ef3e2017-04-16 09:48:24 -07004544 extack);
Thomas Graf461d8832006-09-18 00:09:49 -07004545 if (err < 0)
4546 return err;
4547
4548 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004549 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004550 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004551 return -EINVAL;
4552
Thomas Graf461d8832006-09-18 00:09:49 -07004553 if (tb[IFA_CACHEINFO]) {
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004554 struct ifa_cacheinfo *ci;
Thomas Graf461d8832006-09-18 00:09:49 -07004555
4556 ci = nla_data(tb[IFA_CACHEINFO]);
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004557 valid_lft = ci->ifa_valid;
Thomas Graf461d8832006-09-18 00:09:49 -07004558 preferred_lft = ci->ifa_prefered;
4559 } else {
4560 preferred_lft = INFINITY_LIFE_TIME;
4561 valid_lft = INFINITY_LIFE_TIME;
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004562 }
4563
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004564 dev = __dev_get_by_index(net, ifm->ifa_index);
Ian Morris63159f22015-03-29 14:00:04 +01004565 if (!dev)
Thomas Graf7198f8c2006-09-18 00:13:46 -07004566 return -ENODEV;
4567
Jiri Pirko479840f2013-12-06 09:45:21 +01004568 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4569
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004570 /* We ignore other flags so far. */
Thomas Haller761aac72014-01-15 15:36:58 +01004571 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
Madhu Challa93a714d2015-02-25 09:58:35 -08004572 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004573
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08004574 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
Ian Morris63159f22015-03-29 14:00:04 +01004575 if (!ifa) {
Thomas Graf7198f8c2006-09-18 00:13:46 -07004576 /*
4577 * It would be best to check for !NLM_F_CREATE here but
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08004578 * userspace already relies on not having to provide this.
Thomas Graf7198f8c2006-09-18 00:13:46 -07004579 */
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004580 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004581 ifm->ifa_prefixlen, ifa_flags,
4582 preferred_lft, valid_lft);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004583 }
4584
Thomas Graf7198f8c2006-09-18 00:13:46 -07004585 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4586 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4587 err = -EEXIST;
4588 else
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004589 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
Thomas Graf7198f8c2006-09-18 00:13:46 -07004590
4591 in6_ifa_put(ifa);
4592
4593 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004594}
4595
Jiri Pirko479840f2013-12-06 09:45:21 +01004596static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
Thomas Graf101bb222006-09-18 00:11:52 -07004597 u8 scope, int ifindex)
4598{
4599 struct ifaddrmsg *ifm;
4600
4601 ifm = nlmsg_data(nlh);
4602 ifm->ifa_family = AF_INET6;
4603 ifm->ifa_prefixlen = prefixlen;
4604 ifm->ifa_flags = flags;
4605 ifm->ifa_scope = scope;
4606 ifm->ifa_index = ifindex;
4607}
4608
Thomas Graf85486af2006-09-18 00:11:24 -07004609static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4610 unsigned long tstamp, u32 preferred, u32 valid)
4611{
4612 struct ifa_cacheinfo ci;
4613
Thomas Graf18a31e12010-11-17 04:12:02 +00004614 ci.cstamp = cstamp_delta(cstamp);
4615 ci.tstamp = cstamp_delta(tstamp);
Thomas Graf85486af2006-09-18 00:11:24 -07004616 ci.ifa_prefered = preferred;
4617 ci.ifa_valid = valid;
4618
4619 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4620}
4621
Thomas Graf101bb222006-09-18 00:11:52 -07004622static inline int rt_scope(int ifa_scope)
4623{
4624 if (ifa_scope & IFA_HOST)
4625 return RT_SCOPE_HOST;
4626 else if (ifa_scope & IFA_LINK)
4627 return RT_SCOPE_LINK;
4628 else if (ifa_scope & IFA_SITE)
4629 return RT_SCOPE_SITE;
4630 else
4631 return RT_SCOPE_UNIVERSE;
4632}
4633
Thomas Graf0ab68032006-09-18 00:12:35 -07004634static inline int inet6_ifaddr_msgsize(void)
4635{
Thomas Graf339bf982006-11-10 14:10:15 -08004636 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004637 + nla_total_size(16) /* IFA_LOCAL */
Thomas Graf339bf982006-11-10 14:10:15 -08004638 + nla_total_size(16) /* IFA_ADDRESS */
Jiri Pirko479840f2013-12-06 09:45:21 +01004639 + nla_total_size(sizeof(struct ifa_cacheinfo))
4640 + nla_total_size(4) /* IFA_FLAGS */;
Thomas Graf0ab68032006-09-18 00:12:35 -07004641}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07004642
Linus Torvalds1da177e2005-04-16 15:20:36 -07004643static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004644 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004645{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004646 struct nlmsghdr *nlh;
Thomas Graf85486af2006-09-18 00:11:24 -07004647 u32 preferred, valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004648
Eric W. Biederman15e47302012-09-07 20:12:54 +00004649 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004650 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004651 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004652
Thomas Graf101bb222006-09-18 00:11:52 -07004653 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4654 ifa->idev->dev->ifindex);
4655
Yasushi Asanofad8da32013-12-31 12:04:19 +09004656 if (!((ifa->flags&IFA_F_PERMANENT) &&
4657 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
Thomas Graf85486af2006-09-18 00:11:24 -07004658 preferred = ifa->prefered_lft;
4659 valid = ifa->valid_lft;
4660 if (preferred != INFINITY_LIFE_TIME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004661 long tval = (jiffies - ifa->tstamp)/HZ;
Jens Rosenbooma1faa692009-06-25 04:55:50 +00004662 if (preferred > tval)
4663 preferred -= tval;
4664 else
4665 preferred = 0;
Ben Hutchingsf56619f2010-06-26 11:37:47 +00004666 if (valid != INFINITY_LIFE_TIME) {
4667 if (valid > tval)
4668 valid -= tval;
4669 else
4670 valid = 0;
4671 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004672 }
4673 } else {
Thomas Graf85486af2006-09-18 00:11:24 -07004674 preferred = INFINITY_LIFE_TIME;
4675 valid = INFINITY_LIFE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004676 }
Thomas Graf85486af2006-09-18 00:11:24 -07004677
Cong Wang7996c792013-05-22 05:41:06 +00004678 if (!ipv6_addr_any(&ifa->peer_addr)) {
Jiri Benc930345e2015-03-29 16:59:25 +02004679 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4680 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004681 goto error;
4682 } else
Jiri Benc930345e2015-03-29 16:59:25 +02004683 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004684 goto error;
4685
4686 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4687 goto error;
Thomas Graf85486af2006-09-18 00:11:24 -07004688
Jiri Pirko479840f2013-12-06 09:45:21 +01004689 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4690 goto error;
4691
Johannes Berg053c0952015-01-16 22:09:00 +01004692 nlmsg_end(skb, nlh);
4693 return 0;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004694
4695error:
4696 nlmsg_cancel(skb, nlh);
4697 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004698}
4699
4700static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004701 u32 portid, u32 seq, int event, u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004702{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004703 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004704 u8 scope = RT_SCOPE_UNIVERSE;
4705 int ifindex = ifmca->idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004706
Thomas Graf101bb222006-09-18 00:11:52 -07004707 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4708 scope = RT_SCOPE_SITE;
4709
Eric W. Biederman15e47302012-09-07 20:12:54 +00004710 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004711 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004712 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004713
Thomas Graf101bb222006-09-18 00:11:52 -07004714 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004715 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004716 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004717 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4718 nlmsg_cancel(skb, nlh);
4719 return -EMSGSIZE;
4720 }
Thomas Graf85486af2006-09-18 00:11:24 -07004721
Johannes Berg053c0952015-01-16 22:09:00 +01004722 nlmsg_end(skb, nlh);
4723 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004724}
4725
4726static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004727 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004728{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004729 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004730 u8 scope = RT_SCOPE_UNIVERSE;
4731 int ifindex = ifaca->aca_idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004732
Thomas Graf101bb222006-09-18 00:11:52 -07004733 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4734 scope = RT_SCOPE_SITE;
4735
Eric W. Biederman15e47302012-09-07 20:12:54 +00004736 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004737 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004738 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004739
Thomas Graf101bb222006-09-18 00:11:52 -07004740 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004741 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004742 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004743 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4744 nlmsg_cancel(skb, nlh);
4745 return -EMSGSIZE;
4746 }
Thomas Graf85486af2006-09-18 00:11:24 -07004747
Johannes Berg053c0952015-01-16 22:09:00 +01004748 nlmsg_end(skb, nlh);
4749 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004750}
4751
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004752enum addr_type_t {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004753 UNICAST_ADDR,
4754 MULTICAST_ADDR,
4755 ANYCAST_ADDR,
4756};
4757
Eric Dumazet234b27c2009-11-12 04:11:50 +00004758/* called with rcu_read_lock() */
4759static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4760 struct netlink_callback *cb, enum addr_type_t type,
4761 int s_ip_idx, int *p_ip_idx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004762{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004763 struct ifmcaddr6 *ifmca;
4764 struct ifacaddr6 *ifaca;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004765 int err = 1;
4766 int ip_idx = *p_ip_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004767
Eric Dumazet234b27c2009-11-12 04:11:50 +00004768 read_lock_bh(&idev->lock);
4769 switch (type) {
stephen hemminger502a2ff2010-03-17 20:31:13 +00004770 case UNICAST_ADDR: {
4771 struct inet6_ifaddr *ifa;
4772
Eric Dumazet234b27c2009-11-12 04:11:50 +00004773 /* unicast address incl. temp addr */
stephen hemminger502a2ff2010-03-17 20:31:13 +00004774 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4775 if (++ip_idx < s_ip_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004776 continue;
4777 err = inet6_fill_ifaddr(skb, ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004778 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004779 cb->nlh->nlmsg_seq,
4780 RTM_NEWADDR,
4781 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004782 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004783 break;
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004784 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004785 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004786 break;
stephen hemminger502a2ff2010-03-17 20:31:13 +00004787 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004788 case MULTICAST_ADDR:
4789 /* multicast address */
4790 for (ifmca = idev->mc_list; ifmca;
4791 ifmca = ifmca->next, ip_idx++) {
4792 if (ip_idx < s_ip_idx)
4793 continue;
4794 err = inet6_fill_ifmcaddr(skb, ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004795 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004796 cb->nlh->nlmsg_seq,
4797 RTM_GETMULTICAST,
4798 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004799 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004800 break;
4801 }
4802 break;
4803 case ANYCAST_ADDR:
4804 /* anycast address */
4805 for (ifaca = idev->ac_list; ifaca;
4806 ifaca = ifaca->aca_next, ip_idx++) {
4807 if (ip_idx < s_ip_idx)
4808 continue;
4809 err = inet6_fill_ifacaddr(skb, ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004810 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004811 cb->nlh->nlmsg_seq,
4812 RTM_GETANYCAST,
4813 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004814 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004815 break;
4816 }
4817 break;
4818 default:
4819 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004820 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004821 read_unlock_bh(&idev->lock);
4822 *p_ip_idx = ip_idx;
4823 return err;
4824}
4825
4826static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4827 enum addr_type_t type)
4828{
4829 struct net *net = sock_net(skb->sk);
4830 int h, s_h;
4831 int idx, ip_idx;
4832 int s_idx, s_ip_idx;
4833 struct net_device *dev;
4834 struct inet6_dev *idev;
4835 struct hlist_head *head;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004836
4837 s_h = cb->args[0];
4838 s_idx = idx = cb->args[1];
4839 s_ip_idx = ip_idx = cb->args[2];
4840
4841 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004842 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004843 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4844 idx = 0;
4845 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08004846 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet234b27c2009-11-12 04:11:50 +00004847 if (idx < s_idx)
4848 goto cont;
Patrick McHardy4b97efd2010-03-26 20:27:49 -07004849 if (h > s_h || idx > s_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004850 s_ip_idx = 0;
4851 ip_idx = 0;
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004852 idev = __in6_dev_get(dev);
4853 if (!idev)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004854 goto cont;
4855
4856 if (in6_dump_addrs(idev, skb, cb, type,
David S. Miller7b46a642015-01-18 23:36:08 -05004857 s_ip_idx, &ip_idx) < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004858 goto done;
4859cont:
4860 idx++;
4861 }
4862 }
4863done:
4864 rcu_read_unlock();
4865 cb->args[0] = h;
4866 cb->args[1] = idx;
4867 cb->args[2] = ip_idx;
4868
Linus Torvalds1da177e2005-04-16 15:20:36 -07004869 return skb->len;
4870}
4871
4872static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4873{
4874 enum addr_type_t type = UNICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004875
Linus Torvalds1da177e2005-04-16 15:20:36 -07004876 return inet6_dump_addr(skb, cb, type);
4877}
4878
4879static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4880{
4881 enum addr_type_t type = MULTICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004882
Linus Torvalds1da177e2005-04-16 15:20:36 -07004883 return inet6_dump_addr(skb, cb, type);
4884}
4885
4886
4887static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4888{
4889 enum addr_type_t type = ANYCAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004890
Linus Torvalds1da177e2005-04-16 15:20:36 -07004891 return inet6_dump_addr(skb, cb, type);
4892}
4893
David Ahernc21ef3e2017-04-16 09:48:24 -07004894static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4895 struct netlink_ext_ack *extack)
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004896{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004897 struct net *net = sock_net(in_skb->sk);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004898 struct ifaddrmsg *ifm;
4899 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004900 struct in6_addr *addr = NULL, *peer;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004901 struct net_device *dev = NULL;
4902 struct inet6_ifaddr *ifa;
4903 struct sk_buff *skb;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004904 int err;
4905
Johannes Bergfceb6432017-04-12 14:34:07 +02004906 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
David Ahernc21ef3e2017-04-16 09:48:24 -07004907 extack);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004908 if (err < 0)
Florian Westphalc24675f2017-10-11 10:28:01 +02004909 return err;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004910
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004911 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
Florian Westphalc24675f2017-10-11 10:28:01 +02004912 if (!addr)
4913 return -EINVAL;
Thomas Graf1b29fc22006-09-18 00:10:50 -07004914
4915 ifm = nlmsg_data(nlh);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004916 if (ifm->ifa_index)
Florian Westphalc24675f2017-10-11 10:28:01 +02004917 dev = dev_get_by_index(net, ifm->ifa_index);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004918
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004919 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4920 if (!ifa) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004921 err = -EADDRNOTAVAIL;
4922 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004923 }
4924
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004925 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4926 if (!skb) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004927 err = -ENOBUFS;
4928 goto errout_ifa;
4929 }
4930
Eric W. Biederman15e47302012-09-07 20:12:54 +00004931 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004932 nlh->nlmsg_seq, RTM_NEWADDR, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004933 if (err < 0) {
4934 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4935 WARN_ON(err == -EMSGSIZE);
4936 kfree_skb(skb);
4937 goto errout_ifa;
4938 }
Eric W. Biederman15e47302012-09-07 20:12:54 +00004939 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004940errout_ifa:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004941 in6_ifa_put(ifa);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004942errout:
Florian Westphalc24675f2017-10-11 10:28:01 +02004943 if (dev)
4944 dev_put(dev);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004945 return err;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004946}
4947
Linus Torvalds1da177e2005-04-16 15:20:36 -07004948static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4949{
4950 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09004951 struct net *net = dev_net(ifa->idev->dev);
Thomas Graf5d620262006-08-15 00:35:02 -07004952 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004953
Mahesh Bandewarf784ad32017-01-04 15:01:01 -08004954 /* Don't send DELADDR notification for TENTATIVE address,
4955 * since NEWADDR notification is sent only after removing
Mike Manning6819a142017-09-04 15:52:55 +01004956 * TENTATIVE flag, if DAD has not failed.
Mahesh Bandewarf784ad32017-01-04 15:01:01 -08004957 */
Mike Manning6819a142017-09-04 15:52:55 +01004958 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4959 event == RTM_DELADDR)
Mahesh Bandewarf784ad32017-01-04 15:01:01 -08004960 return;
4961
Thomas Graf0ab68032006-09-18 00:12:35 -07004962 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01004963 if (!skb)
Thomas Graf5d620262006-08-15 00:35:02 -07004964 goto errout;
4965
4966 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004967 if (err < 0) {
4968 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4969 WARN_ON(err == -EMSGSIZE);
4970 kfree_skb(skb);
4971 goto errout;
4972 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08004973 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4974 return;
Thomas Graf5d620262006-08-15 00:35:02 -07004975errout:
4976 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004977 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004978}
4979
Dave Jonesb6f99a22007-03-22 12:27:49 -07004980static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004981 __s32 *array, int bytes)
4982{
Thomas Graf04561c12006-11-14 19:53:58 -08004983 BUG_ON(bytes < (DEVCONF_MAX * 4));
4984
Linus Torvalds1da177e2005-04-16 15:20:36 -07004985 memset(array, 0, bytes);
4986 array[DEVCONF_FORWARDING] = cnf->forwarding;
4987 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4988 array[DEVCONF_MTU6] = cnf->mtu6;
4989 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4990 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4991 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4992 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4993 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
Thomas Graf93908d12010-11-17 01:44:24 +00004994 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4995 jiffies_to_msecs(cnf->rtr_solicit_interval);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004996 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4997 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
Thomas Graf93908d12010-11-17 01:44:24 +00004998 array[DEVCONF_RTR_SOLICIT_DELAY] =
4999 jiffies_to_msecs(cnf->rtr_solicit_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005000 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +02005001 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5002 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5003 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5004 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005005 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5006 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5007 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5008 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5009 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005010 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08005011 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
Hangbin Liu8013d1d2015-07-30 14:28:42 +08005012 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -08005013 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005014#ifdef CONFIG_IPV6_ROUTER_PREF
5015 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
Thomas Graf93908d12010-11-17 01:44:24 +00005016 array[DEVCONF_RTR_PROBE_INTERVAL] =
5017 jiffies_to_msecs(cnf->rtr_probe_interval);
Neil Hormanfa03ef32007-01-30 14:30:10 -08005018#ifdef CONFIG_IPV6_ROUTE_INFO
Joel Scherpelzbbea1242017-03-22 18:19:04 +09005019 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08005020 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5021#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005022#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -07005023 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -07005024 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
Neil Horman95c385b2007-04-25 17:08:10 -07005025#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5026 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
Erik Kline7fd25612014-10-28 18:11:14 +09005027 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
Neil Horman95c385b2007-04-25 17:08:10 -07005028#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09005029#ifdef CONFIG_IPV6_MROUTE
5030 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5031#endif
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +09005032 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09005033 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
Cosmin Ratiuc3faca02009-10-09 03:11:14 +00005034 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +00005035 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +02005036 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
Ben Greeard9333192014-06-25 14:44:53 -07005037 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
Harout Hedeshianc2943f12015-01-20 10:06:05 -07005038 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
Andy Gospodarek35103d12015-08-13 10:39:01 -04005039 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005040 /* we omit DEVCONF_STABLE_SECRET for now */
Erik Kline3985e8a2015-07-22 16:38:25 +09005041 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
Johannes Bergabbc3042016-02-04 13:31:19 +01005042 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
Johannes Berg7a02bf82016-02-04 13:31:20 +01005043 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
David Ahernf1705ec2016-02-24 09:25:37 -08005044 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
David Lebrun1ababeb2016-11-08 14:57:39 +01005045 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
David Lebrunbf355b82016-11-08 14:57:42 +01005046#ifdef CONFIG_IPV6_SEG6_HMAC
5047 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5048#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -08005049 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
Felix Jiad35a00b2017-01-26 16:59:17 +13005050 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
David Forsterdf789fe2017-02-23 16:27:18 +00005051 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005052}
5053
Thomas Grafb382b192010-11-16 04:33:57 +00005054static inline size_t inet6_ifla6_size(void)
5055{
5056 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5057 + nla_total_size(sizeof(struct ifla_cacheinfo))
5058 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5059 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005060 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5061 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
Thomas Grafb382b192010-11-16 04:33:57 +00005062}
5063
Thomas Graf339bf982006-11-10 14:10:15 -08005064static inline size_t inet6_if_nlmsg_size(void)
5065{
5066 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5067 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5068 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5069 + nla_total_size(4) /* IFLA_MTU */
5070 + nla_total_size(4) /* IFLA_LINK */
Andy Gospodarek03443382015-08-13 15:26:35 -04005071 + nla_total_size(1) /* IFLA_OPERSTATE */
Thomas Grafb382b192010-11-16 04:33:57 +00005072 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
Thomas Graf339bf982006-11-10 14:10:15 -08005073}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005074
Eric Dumazetbe281e52011-05-19 01:14:23 +00005075static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
Jia Heaca05672016-09-30 11:29:03 +08005076 int bytes)
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005077{
5078 int i;
Jia Heaca05672016-09-30 11:29:03 +08005079 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005080 BUG_ON(pad < 0);
5081
5082 /* Use put_unaligned() because stats may not be aligned for u64. */
Jia Heaca05672016-09-30 11:29:03 +08005083 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5084 for (i = 1; i < ICMP6_MIB_MAX; i++)
Eric Dumazetbe281e52011-05-19 01:14:23 +00005085 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005086
Jia Heaca05672016-09-30 11:29:03 +08005087 memset(&stats[ICMP6_MIB_MAX], 0, pad);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005088}
5089
WANG Cong698365f2014-05-05 15:55:55 -07005090static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305091 int bytes, size_t syncpoff)
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005092{
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305093 int i, c;
5094 u64 buff[IPSTATS_MIB_MAX];
5095 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5096
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005097 BUG_ON(pad < 0);
5098
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305099 memset(buff, 0, sizeof(buff));
5100 buff[0] = IPSTATS_MIB_MAX;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005101
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305102 for_each_possible_cpu(c) {
5103 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5104 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5105 }
5106
5107 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5108 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005109}
5110
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005111static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5112 int bytes)
5113{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07005114 switch (attrtype) {
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005115 case IFLA_INET6_STATS:
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305116 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5117 offsetof(struct ipstats_mib, syncp));
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005118 break;
5119 case IFLA_INET6_ICMP6STATS:
Jia Heaca05672016-09-30 11:29:03 +08005120 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005121 break;
5122 }
5123}
5124
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005125static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5126 u32 ext_filter_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005127{
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005128 struct nlattr *nla;
Thomas Graf04561c12006-11-14 19:53:58 -08005129 struct ifla_cacheinfo ci;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005130
David S. Millerc78679e2012-04-01 20:27:33 -04005131 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5132 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005133 ci.max_reasm_len = IPV6_MAXPLEN;
David S. Miller24912422010-11-19 13:13:47 -08005134 ci.tstamp = cstamp_delta(idev->tstamp);
5135 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
Jiri Pirko1f9248e2013-12-07 19:26:53 +01005136 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
David S. Millerc78679e2012-04-01 20:27:33 -04005137 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5138 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005139 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
Ian Morris63159f22015-03-29 14:00:04 +01005140 if (!nla)
Thomas Graf04561c12006-11-14 19:53:58 -08005141 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005142 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005143
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005144 /* XXX - MC not implemented */
5145
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005146 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5147 return 0;
5148
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005149 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005150 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005151 goto nla_put_failure;
5152 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5153
5154 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005155 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005156 goto nla_put_failure;
5157 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005158
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005159 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
Ian Morris63159f22015-03-29 14:00:04 +01005160 if (!nla)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005161 goto nla_put_failure;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005162
Felix Jiad35a00b2017-01-26 16:59:17 +13005163 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005164 goto nla_put_failure;
5165
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005166 read_lock_bh(&idev->lock);
5167 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5168 read_unlock_bh(&idev->lock);
5169
Thomas Grafb382b192010-11-16 04:33:57 +00005170 return 0;
5171
5172nla_put_failure:
5173 return -EMSGSIZE;
5174}
5175
Arad, Ronenb1974ed2015-10-19 09:23:28 -07005176static size_t inet6_get_link_af_size(const struct net_device *dev,
5177 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005178{
5179 if (!__in6_dev_get(dev))
5180 return 0;
5181
5182 return inet6_ifla6_size();
5183}
5184
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005185static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5186 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005187{
5188 struct inet6_dev *idev = __in6_dev_get(dev);
5189
5190 if (!idev)
5191 return -ENODATA;
5192
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005193 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005194 return -EMSGSIZE;
5195
5196 return 0;
5197}
5198
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005199static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5200{
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005201 struct inet6_ifaddr *ifp;
5202 struct net_device *dev = idev->dev;
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005203 bool clear_token, update_rs = false;
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005204 struct in6_addr ll_addr;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005205
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005206 ASSERT_RTNL();
5207
Ian Morris63159f22015-03-29 14:00:04 +01005208 if (!token)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005209 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005210 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5211 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005212 if (!ipv6_accept_ra(idev))
5213 return -EINVAL;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005214 if (idev->cnf.rtr_solicits == 0)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005215 return -EINVAL;
5216
5217 write_lock_bh(&idev->lock);
5218
5219 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5220 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5221
5222 write_unlock_bh(&idev->lock);
5223
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005224 clear_token = ipv6_addr_any(token);
5225 if (clear_token)
5226 goto update_lft;
5227
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005228 if (!idev->dead && (idev->if_flags & IF_READY) &&
5229 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5230 IFA_F_OPTIMISTIC)) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005231 /* If we're not ready, then normal ifup will take care
5232 * of this. Otherwise, we need to request our rs here.
5233 */
5234 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5235 update_rs = true;
5236 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005237
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005238update_lft:
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005239 write_lock_bh(&idev->lock);
Daniel Borkmannfc403832013-04-09 03:47:15 +00005240
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005241 if (update_rs) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005242 idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005243 idev->rs_interval = rfc3315_s14_backoff_init(
5244 idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005245 idev->rs_probes = 1;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005246 addrconf_mod_rs_timer(idev, idev->rs_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005247 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005248
5249 /* Well, that's kinda nasty ... */
5250 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5251 spin_lock(&ifp->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00005252 if (ifp->tokenized) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005253 ifp->valid_lft = 0;
5254 ifp->prefered_lft = 0;
5255 }
5256 spin_unlock(&ifp->lock);
5257 }
5258
5259 write_unlock_bh(&idev->lock);
Lubomir Rintelb2ed64a2014-10-27 17:39:16 +01005260 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005261 addrconf_verify_rtnl();
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005262 return 0;
5263}
5264
Daniel Borkmann11b1f822015-02-05 14:39:11 +01005265static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5266 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5267 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5268};
5269
5270static int inet6_validate_link_af(const struct net_device *dev,
5271 const struct nlattr *nla)
5272{
5273 struct nlattr *tb[IFLA_INET6_MAX + 1];
5274
5275 if (dev && !__in6_dev_get(dev))
5276 return -EAFNOSUPPORT;
5277
Johannes Bergfceb6432017-04-12 14:34:07 +02005278 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5279 NULL);
Daniel Borkmann11b1f822015-02-05 14:39:11 +01005280}
5281
Felix Jiad35a00b2017-01-26 16:59:17 +13005282static int check_addr_gen_mode(int mode)
5283{
5284 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5285 mode != IN6_ADDR_GEN_MODE_NONE &&
5286 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5287 mode != IN6_ADDR_GEN_MODE_RANDOM)
5288 return -EINVAL;
5289 return 1;
5290}
5291
5292static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5293 int mode)
5294{
5295 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5296 !idev->cnf.stable_secret.initialized &&
5297 !net->ipv6.devconf_dflt->stable_secret.initialized)
5298 return -EINVAL;
5299 return 1;
5300}
5301
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005302static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5303{
5304 int err = -EINVAL;
5305 struct inet6_dev *idev = __in6_dev_get(dev);
5306 struct nlattr *tb[IFLA_INET6_MAX + 1];
5307
5308 if (!idev)
5309 return -EAFNOSUPPORT;
5310
Johannes Bergfceb6432017-04-12 14:34:07 +02005311 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005312 BUG();
5313
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005314 if (tb[IFLA_INET6_TOKEN]) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005315 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005316 if (err)
5317 return err;
5318 }
5319
5320 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5321 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5322
Felix Jiad35a00b2017-01-26 16:59:17 +13005323 if (check_addr_gen_mode(mode) < 0 ||
5324 check_stable_privacy(idev, dev_net(dev), mode) < 0)
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005325 return -EINVAL;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005326
Felix Jiad35a00b2017-01-26 16:59:17 +13005327 idev->cnf.addr_gen_mode = mode;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005328 err = 0;
5329 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005330
5331 return err;
5332}
5333
Thomas Grafb382b192010-11-16 04:33:57 +00005334static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005335 u32 portid, u32 seq, int event, unsigned int flags)
Thomas Grafb382b192010-11-16 04:33:57 +00005336{
5337 struct net_device *dev = idev->dev;
5338 struct ifinfomsg *hdr;
5339 struct nlmsghdr *nlh;
5340 void *protoinfo;
5341
Eric W. Biederman15e47302012-09-07 20:12:54 +00005342 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005343 if (!nlh)
Thomas Grafb382b192010-11-16 04:33:57 +00005344 return -EMSGSIZE;
5345
5346 hdr = nlmsg_data(nlh);
5347 hdr->ifi_family = AF_INET6;
5348 hdr->__ifi_pad = 0;
5349 hdr->ifi_type = dev->type;
5350 hdr->ifi_index = dev->ifindex;
5351 hdr->ifi_flags = dev_get_flags(dev);
5352 hdr->ifi_change = 0;
5353
David S. Millerc78679e2012-04-01 20:27:33 -04005354 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5355 (dev->addr_len &&
5356 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5357 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
Nicolas Dichtela54acb32015-04-02 17:07:00 +02005358 (dev->ifindex != dev_get_iflink(dev) &&
Andy Gospodarek03443382015-08-13 15:26:35 -04005359 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5360 nla_put_u8(skb, IFLA_OPERSTATE,
5361 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
David S. Millerc78679e2012-04-01 20:27:33 -04005362 goto nla_put_failure;
Thomas Grafb382b192010-11-16 04:33:57 +00005363 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
Ian Morris63159f22015-03-29 14:00:04 +01005364 if (!protoinfo)
Thomas Grafb382b192010-11-16 04:33:57 +00005365 goto nla_put_failure;
5366
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005367 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005368 goto nla_put_failure;
5369
Thomas Graf04561c12006-11-14 19:53:58 -08005370 nla_nest_end(skb, protoinfo);
Johannes Berg053c0952015-01-16 22:09:00 +01005371 nlmsg_end(skb, nlh);
5372 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005373
Thomas Graf04561c12006-11-14 19:53:58 -08005374nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005375 nlmsg_cancel(skb, nlh);
5376 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005377}
5378
5379static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5380{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09005381 struct net *net = sock_net(skb->sk);
Eric Dumazet84d26972009-11-09 12:11:28 +00005382 int h, s_h;
David S. Miller434a8a52009-11-11 18:53:00 -08005383 int idx = 0, s_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005384 struct net_device *dev;
5385 struct inet6_dev *idev;
Eric Dumazet84d26972009-11-09 12:11:28 +00005386 struct hlist_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005387
Eric Dumazet84d26972009-11-09 12:11:28 +00005388 s_h = cb->args[0];
5389 s_idx = cb->args[1];
5390
5391 rcu_read_lock();
5392 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5393 idx = 0;
5394 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08005395 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet84d26972009-11-09 12:11:28 +00005396 if (idx < s_idx)
5397 goto cont;
5398 idev = __in6_dev_get(dev);
5399 if (!idev)
5400 goto cont;
5401 if (inet6_fill_ifinfo(skb, idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005402 NETLINK_CB(cb->skb).portid,
Eric Dumazet84d26972009-11-09 12:11:28 +00005403 cb->nlh->nlmsg_seq,
Johannes Berg053c0952015-01-16 22:09:00 +01005404 RTM_NEWLINK, NLM_F_MULTI) < 0)
Eric Dumazet84d26972009-11-09 12:11:28 +00005405 goto out;
Pavel Emelianov7562f872007-05-03 15:13:45 -07005406cont:
Eric Dumazet84d26972009-11-09 12:11:28 +00005407 idx++;
5408 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005409 }
Eric Dumazet84d26972009-11-09 12:11:28 +00005410out:
5411 rcu_read_unlock();
5412 cb->args[1] = idx;
5413 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005414
5415 return skb->len;
5416}
5417
5418void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5419{
5420 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005421 struct net *net = dev_net(idev->dev);
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005422 int err = -ENOBUFS;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005423
Thomas Graf339bf982006-11-10 14:10:15 -08005424 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005425 if (!skb)
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005426 goto errout;
5427
5428 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005429 if (err < 0) {
5430 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5431 WARN_ON(err == -EMSGSIZE);
5432 kfree_skb(skb);
5433 goto errout;
5434 }
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005435 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005436 return;
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005437errout:
5438 if (err < 0)
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005439 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005440}
5441
Thomas Graf339bf982006-11-10 14:10:15 -08005442static inline size_t inet6_prefix_nlmsg_size(void)
5443{
5444 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5445 + nla_total_size(sizeof(struct in6_addr))
5446 + nla_total_size(sizeof(struct prefix_cacheinfo));
5447}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005448
Linus Torvalds1da177e2005-04-16 15:20:36 -07005449static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005450 struct prefix_info *pinfo, u32 portid, u32 seq,
Thomas Graf6051e2f2006-11-14 19:54:19 -08005451 int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005452{
Thomas Graf6051e2f2006-11-14 19:54:19 -08005453 struct prefixmsg *pmsg;
5454 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005455 struct prefix_cacheinfo ci;
5456
Eric W. Biederman15e47302012-09-07 20:12:54 +00005457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005458 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08005459 return -EMSGSIZE;
Thomas Graf6051e2f2006-11-14 19:54:19 -08005460
5461 pmsg = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005462 pmsg->prefix_family = AF_INET6;
Patrick McHardy8a470772005-06-28 12:56:45 -07005463 pmsg->prefix_pad1 = 0;
5464 pmsg->prefix_pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005465 pmsg->prefix_ifindex = idev->dev->ifindex;
5466 pmsg->prefix_len = pinfo->prefix_len;
5467 pmsg->prefix_type = pinfo->type;
Patrick McHardy8a470772005-06-28 12:56:45 -07005468 pmsg->prefix_pad3 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005469 pmsg->prefix_flags = 0;
5470 if (pinfo->onlink)
5471 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5472 if (pinfo->autoconf)
5473 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5474
David S. Millerc78679e2012-04-01 20:27:33 -04005475 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5476 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005477 ci.preferred_time = ntohl(pinfo->prefered);
5478 ci.valid_time = ntohl(pinfo->valid);
David S. Millerc78679e2012-04-01 20:27:33 -04005479 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5480 goto nla_put_failure;
Johannes Berg053c0952015-01-16 22:09:00 +01005481 nlmsg_end(skb, nlh);
5482 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005483
Thomas Graf6051e2f2006-11-14 19:54:19 -08005484nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005485 nlmsg_cancel(skb, nlh);
5486 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005487}
5488
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005489static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005490 struct prefix_info *pinfo)
5491{
5492 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005493 struct net *net = dev_net(idev->dev);
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005494 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005495
Thomas Graf339bf982006-11-10 14:10:15 -08005496 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005497 if (!skb)
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005498 goto errout;
5499
5500 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005501 if (err < 0) {
5502 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5503 WARN_ON(err == -EMSGSIZE);
5504 kfree_skb(skb);
5505 goto errout;
5506 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005507 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5508 return;
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005509errout:
5510 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08005511 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005512}
5513
Linus Torvalds1da177e2005-04-16 15:20:36 -07005514static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5515{
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005516 struct net *net = dev_net(ifp->idev->dev);
5517
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005518 if (event)
5519 ASSERT_RTNL();
5520
Linus Torvalds1da177e2005-04-16 15:20:36 -07005521 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5522
5523 switch (event) {
5524 case RTM_NEWADDR:
Neil Horman95c385b2007-04-25 17:08:10 -07005525 /*
5526 * If the address was optimistic
5527 * we inserted the route at the start of
5528 * our DAD process, so we don't need
5529 * to do it again
5530 */
Wei Wang4e587ea2017-08-25 15:03:10 -07005531 if (!rcu_access_pointer(ifp->rt->rt6i_node))
Neil Horman95c385b2007-04-25 17:08:10 -07005532 ip6_ins_rt(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005533 if (ifp->idev->cnf.forwarding)
5534 addrconf_join_anycast(ifp);
Cong Wang7996c792013-05-22 05:41:06 +00005535 if (!ipv6_addr_any(&ifp->peer_addr))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005536 addrconf_prefix_route(&ifp->peer_addr, 128,
5537 ifp->idev->dev, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005538 break;
5539 case RTM_DELADDR:
5540 if (ifp->idev->cnf.forwarding)
5541 addrconf_leave_anycast(ifp);
5542 addrconf_leave_solict(ifp->idev, &ifp->addr);
Cong Wang7996c792013-05-22 05:41:06 +00005543 if (!ipv6_addr_any(&ifp->peer_addr)) {
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005544 struct rt6_info *rt;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005545
Nicolas Dichtele7478df2014-09-03 23:59:22 +02005546 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5547 ifp->idev->dev, 0, 0);
Martin KaFai Lau8e3d5be2015-09-15 14:30:08 -07005548 if (rt)
5549 ip6_del_rt(rt);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005550 }
David Ahern38bd10c2016-04-21 20:56:12 -07005551 if (ifp->rt) {
Wei Wangad65a2f2017-06-17 10:42:35 -07005552 if (dst_hold_safe(&ifp->rt->dst))
5553 ip6_del_rt(ifp->rt);
David Ahern38bd10c2016-04-21 20:56:12 -07005554 }
Hannes Frederic Sowa705f1c82014-09-28 00:46:06 +02005555 rt_genid_bump_ipv6(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005556 break;
5557 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005558 atomic_inc(&net->ipv6.dev_addr_genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005559}
5560
5561static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5562{
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005563 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005564 if (likely(ifp->idev->dead == 0))
5565 __ipv6_ifa_notify(event, ifp);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005566 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005567}
5568
5569#ifdef CONFIG_SYSCTL
5570
5571static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005572int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005573 void __user *buffer, size_t *lenp, loff_t *ppos)
5574{
5575 int *valp = ctl->data;
5576 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005577 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005578 struct ctl_table lctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005579 int ret;
5580
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005581 /*
5582 * ctl->data points to idev->cnf.forwarding, we should
5583 * not modify it until we get the rtnl lock.
5584 */
5585 lctl = *ctl;
5586 lctl.data = &val;
5587
5588 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005589
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -08005590 if (write)
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +00005591 ret = addrconf_fixup_forwarding(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005592 if (ret)
5593 *ppos = pos;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005594 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005595}
5596
Marcelo Leitner77751422015-02-23 11:17:13 -03005597static
5598int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5599 void __user *buffer, size_t *lenp, loff_t *ppos)
5600{
5601 struct inet6_dev *idev = ctl->extra1;
5602 int min_mtu = IPV6_MIN_MTU;
5603 struct ctl_table lctl;
5604
5605 lctl = *ctl;
5606 lctl.extra1 = &min_mtu;
5607 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5608
5609 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5610}
5611
Brian Haley56d417b2009-06-01 03:07:33 -07005612static void dev_disable_change(struct inet6_dev *idev)
5613{
Cong Wang75538c22013-05-29 11:30:50 +08005614 struct netdev_notifier_info info;
5615
Brian Haley56d417b2009-06-01 03:07:33 -07005616 if (!idev || !idev->dev)
5617 return;
5618
Cong Wang75538c22013-05-29 11:30:50 +08005619 netdev_notifier_info_init(&info, idev->dev);
Brian Haley56d417b2009-06-01 03:07:33 -07005620 if (idev->cnf.disable_ipv6)
Cong Wang75538c22013-05-29 11:30:50 +08005621 addrconf_notify(NULL, NETDEV_DOWN, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005622 else
Cong Wang75538c22013-05-29 11:30:50 +08005623 addrconf_notify(NULL, NETDEV_UP, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005624}
5625
5626static void addrconf_disable_change(struct net *net, __s32 newf)
5627{
5628 struct net_device *dev;
5629 struct inet6_dev *idev;
5630
Kefeng Wang03e4def2017-01-19 16:26:21 +08005631 for_each_netdev(net, dev) {
Brian Haley56d417b2009-06-01 03:07:33 -07005632 idev = __in6_dev_get(dev);
5633 if (idev) {
5634 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5635 idev->cnf.disable_ipv6 = newf;
5636 if (changed)
5637 dev_disable_change(idev);
5638 }
Brian Haley56d417b2009-06-01 03:07:33 -07005639 }
Brian Haley56d417b2009-06-01 03:07:33 -07005640}
5641
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005642static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
Brian Haley56d417b2009-06-01 03:07:33 -07005643{
5644 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005645 int old;
5646
5647 if (!rtnl_trylock())
5648 return restart_syscall();
Brian Haley56d417b2009-06-01 03:07:33 -07005649
5650 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005651 old = *p;
5652 *p = newf;
Brian Haley56d417b2009-06-01 03:07:33 -07005653
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005654 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5655 rtnl_unlock();
Brian Haley56d417b2009-06-01 03:07:33 -07005656 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005657 }
Brian Haley56d417b2009-06-01 03:07:33 -07005658
5659 if (p == &net->ipv6.devconf_all->disable_ipv6) {
Brian Haley56d417b2009-06-01 03:07:33 -07005660 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5661 addrconf_disable_change(net, newf);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005662 } else if ((!newf) ^ (!old))
Brian Haley56d417b2009-06-01 03:07:33 -07005663 dev_disable_change((struct inet6_dev *)table->extra1);
5664
5665 rtnl_unlock();
5666 return 0;
5667}
5668
5669static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005670int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
Brian Haley56d417b2009-06-01 03:07:33 -07005671 void __user *buffer, size_t *lenp, loff_t *ppos)
5672{
5673 int *valp = ctl->data;
5674 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005675 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005676 struct ctl_table lctl;
Brian Haley56d417b2009-06-01 03:07:33 -07005677 int ret;
5678
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005679 /*
5680 * ctl->data points to idev->cnf.disable_ipv6, we should
5681 * not modify it until we get the rtnl lock.
5682 */
5683 lctl = *ctl;
5684 lctl.data = &val;
5685
5686 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Brian Haley56d417b2009-06-01 03:07:33 -07005687
5688 if (write)
5689 ret = addrconf_disable_ipv6(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005690 if (ret)
5691 *ppos = pos;
Brian Haley56d417b2009-06-01 03:07:33 -07005692 return ret;
5693}
5694
stephen hemmingerc92d5492013-12-17 22:37:14 -08005695static
5696int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5697 void __user *buffer, size_t *lenp, loff_t *ppos)
5698{
5699 int *valp = ctl->data;
5700 int ret;
5701 int old, new;
5702
5703 old = *valp;
5704 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5705 new = *valp;
5706
5707 if (write && old != new) {
5708 struct net *net = ctl->extra2;
5709
5710 if (!rtnl_trylock())
5711 return restart_syscall();
5712
5713 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
David Ahern85b3daa2017-03-28 14:28:04 -07005714 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5715 NETCONFA_PROXY_NEIGH,
stephen hemmingerc92d5492013-12-17 22:37:14 -08005716 NETCONFA_IFINDEX_DEFAULT,
5717 net->ipv6.devconf_dflt);
5718 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
David Ahern85b3daa2017-03-28 14:28:04 -07005719 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5720 NETCONFA_PROXY_NEIGH,
stephen hemmingerc92d5492013-12-17 22:37:14 -08005721 NETCONFA_IFINDEX_ALL,
5722 net->ipv6.devconf_all);
5723 else {
5724 struct inet6_dev *idev = ctl->extra1;
5725
David Ahern85b3daa2017-03-28 14:28:04 -07005726 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5727 NETCONFA_PROXY_NEIGH,
stephen hemmingerc92d5492013-12-17 22:37:14 -08005728 idev->dev->ifindex,
5729 &idev->cnf);
5730 }
5731 rtnl_unlock();
5732 }
5733
5734 return ret;
5735}
5736
Felix Jiad35a00b2017-01-26 16:59:17 +13005737static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5738 void __user *buffer, size_t *lenp,
5739 loff_t *ppos)
5740{
5741 int ret = 0;
5742 int new_val;
5743 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5744 struct net *net = (struct net *)ctl->extra2;
5745
Felix Jia8c171d62017-02-27 12:41:23 +13005746 if (!rtnl_trylock())
5747 return restart_syscall();
5748
Felix Jiad35a00b2017-01-26 16:59:17 +13005749 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5750
5751 if (write) {
5752 new_val = *((int *)ctl->data);
5753
Felix Jia8c171d62017-02-27 12:41:23 +13005754 if (check_addr_gen_mode(new_val) < 0) {
5755 ret = -EINVAL;
5756 goto out;
5757 }
Felix Jiad35a00b2017-01-26 16:59:17 +13005758
5759 /* request for default */
5760 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5761 ipv6_devconf_dflt.addr_gen_mode = new_val;
5762
5763 /* request for individual net device */
5764 } else {
5765 if (!idev)
Felix Jia8c171d62017-02-27 12:41:23 +13005766 goto out;
Felix Jiad35a00b2017-01-26 16:59:17 +13005767
Felix Jia8c171d62017-02-27 12:41:23 +13005768 if (check_stable_privacy(idev, net, new_val) < 0) {
5769 ret = -EINVAL;
5770 goto out;
5771 }
Felix Jiad35a00b2017-01-26 16:59:17 +13005772
5773 if (idev->cnf.addr_gen_mode != new_val) {
5774 idev->cnf.addr_gen_mode = new_val;
Felix Jiad35a00b2017-01-26 16:59:17 +13005775 addrconf_dev_config(idev->dev);
Felix Jiad35a00b2017-01-26 16:59:17 +13005776 }
5777 }
5778 }
5779
Felix Jia8c171d62017-02-27 12:41:23 +13005780out:
5781 rtnl_unlock();
5782
Felix Jiad35a00b2017-01-26 16:59:17 +13005783 return ret;
5784}
5785
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005786static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5787 void __user *buffer, size_t *lenp,
5788 loff_t *ppos)
5789{
5790 int err;
5791 struct in6_addr addr;
5792 char str[IPV6_MAX_STRLEN];
5793 struct ctl_table lctl = *ctl;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005794 struct net *net = ctl->extra2;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005795 struct ipv6_stable_secret *secret = ctl->data;
5796
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005797 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5798 return -EIO;
5799
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005800 lctl.maxlen = IPV6_MAX_STRLEN;
5801 lctl.data = str;
5802
5803 if (!rtnl_trylock())
5804 return restart_syscall();
5805
5806 if (!write && !secret->initialized) {
5807 err = -EIO;
5808 goto out;
5809 }
5810
WANG Cong5449a5c2015-12-21 10:55:45 -08005811 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5812 if (err >= sizeof(str)) {
5813 err = -EIO;
5814 goto out;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005815 }
5816
5817 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5818 if (err || !write)
5819 goto out;
5820
5821 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5822 err = -EIO;
5823 goto out;
5824 }
5825
5826 secret->initialized = true;
5827 secret->secret = addr;
5828
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005829 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5830 struct net_device *dev;
5831
5832 for_each_netdev(net, dev) {
5833 struct inet6_dev *idev = __in6_dev_get(dev);
5834
5835 if (idev) {
Felix Jiad35a00b2017-01-26 16:59:17 +13005836 idev->cnf.addr_gen_mode =
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005837 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5838 }
5839 }
5840 } else {
5841 struct inet6_dev *idev = ctl->extra1;
5842
Felix Jiad35a00b2017-01-26 16:59:17 +13005843 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005844 }
5845
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005846out:
5847 rtnl_unlock();
5848
5849 return err;
5850}
stephen hemmingerc92d5492013-12-17 22:37:14 -08005851
Andy Gospodarek35103d12015-08-13 10:39:01 -04005852static
5853int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5854 int write,
5855 void __user *buffer,
5856 size_t *lenp,
5857 loff_t *ppos)
5858{
5859 int *valp = ctl->data;
5860 int val = *valp;
5861 loff_t pos = *ppos;
5862 struct ctl_table lctl;
5863 int ret;
5864
5865 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5866 * we should not modify it until we get the rtnl lock.
5867 */
5868 lctl = *ctl;
5869 lctl.data = &val;
5870
5871 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5872
5873 if (write)
5874 ret = addrconf_fixup_linkdown(ctl, valp, val);
5875 if (ret)
5876 *ppos = pos;
5877 return ret;
5878}
5879
David Forsterdf789fe2017-02-23 16:27:18 +00005880static
5881void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5882{
5883 if (rt) {
5884 if (action)
5885 rt->dst.flags |= DST_NOPOLICY;
5886 else
5887 rt->dst.flags &= ~DST_NOPOLICY;
5888 }
5889}
5890
5891static
5892void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5893{
5894 struct inet6_ifaddr *ifa;
5895
5896 read_lock_bh(&idev->lock);
5897 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5898 spin_lock(&ifa->lock);
5899 if (ifa->rt) {
5900 struct rt6_info *rt = ifa->rt;
David Forsterdf789fe2017-02-23 16:27:18 +00005901 int cpu;
5902
Wei Wang66f5d6c2017-10-06 12:06:10 -07005903 rcu_read_lock();
David Forsterdf789fe2017-02-23 16:27:18 +00005904 addrconf_set_nopolicy(ifa->rt, val);
5905 if (rt->rt6i_pcpu) {
5906 for_each_possible_cpu(cpu) {
5907 struct rt6_info **rtp;
5908
5909 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5910 addrconf_set_nopolicy(*rtp, val);
5911 }
5912 }
Wei Wang66f5d6c2017-10-06 12:06:10 -07005913 rcu_read_unlock();
David Forsterdf789fe2017-02-23 16:27:18 +00005914 }
5915 spin_unlock(&ifa->lock);
5916 }
5917 read_unlock_bh(&idev->lock);
5918}
5919
5920static
5921int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5922{
5923 struct inet6_dev *idev;
5924 struct net *net;
5925
5926 if (!rtnl_trylock())
5927 return restart_syscall();
5928
5929 *valp = val;
5930
5931 net = (struct net *)ctl->extra2;
5932 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5933 rtnl_unlock();
5934 return 0;
5935 }
5936
5937 if (valp == &net->ipv6.devconf_all->disable_policy) {
5938 struct net_device *dev;
5939
5940 for_each_netdev(net, dev) {
5941 idev = __in6_dev_get(dev);
5942 if (idev)
5943 addrconf_disable_policy_idev(idev, val);
5944 }
5945 } else {
5946 idev = (struct inet6_dev *)ctl->extra1;
5947 addrconf_disable_policy_idev(idev, val);
5948 }
5949
5950 rtnl_unlock();
5951 return 0;
5952}
5953
5954static
5955int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5956 void __user *buffer, size_t *lenp,
5957 loff_t *ppos)
5958{
5959 int *valp = ctl->data;
5960 int val = *valp;
5961 loff_t pos = *ppos;
5962 struct ctl_table lctl;
5963 int ret;
5964
5965 lctl = *ctl;
5966 lctl.data = &val;
5967 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5968
5969 if (write && (*valp != val))
5970 ret = addrconf_disable_policy(ctl, valp, val);
5971
5972 if (ret)
5973 *ppos = pos;
5974
5975 return ret;
5976}
5977
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07005978static int minus_one = -1;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005979static const int one = 1;
5980static const int two_five_five = 255;
5981
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03005982static const struct ctl_table addrconf_sysctl[] = {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005983 {
5984 .procname = "forwarding",
5985 .data = &ipv6_devconf.forwarding,
5986 .maxlen = sizeof(int),
5987 .mode = 0644,
5988 .proc_handler = addrconf_sysctl_forward,
5989 },
5990 {
5991 .procname = "hop_limit",
5992 .data = &ipv6_devconf.hop_limit,
5993 .maxlen = sizeof(int),
5994 .mode = 0644,
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005995 .proc_handler = proc_dointvec_minmax,
5996 .extra1 = (void *)&one,
5997 .extra2 = (void *)&two_five_five,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005998 },
5999 {
6000 .procname = "mtu",
6001 .data = &ipv6_devconf.mtu6,
6002 .maxlen = sizeof(int),
6003 .mode = 0644,
6004 .proc_handler = addrconf_sysctl_mtu,
6005 },
6006 {
6007 .procname = "accept_ra",
6008 .data = &ipv6_devconf.accept_ra,
6009 .maxlen = sizeof(int),
6010 .mode = 0644,
6011 .proc_handler = proc_dointvec,
6012 },
6013 {
6014 .procname = "accept_redirects",
6015 .data = &ipv6_devconf.accept_redirects,
6016 .maxlen = sizeof(int),
6017 .mode = 0644,
6018 .proc_handler = proc_dointvec,
6019 },
6020 {
6021 .procname = "autoconf",
6022 .data = &ipv6_devconf.autoconf,
6023 .maxlen = sizeof(int),
6024 .mode = 0644,
6025 .proc_handler = proc_dointvec,
6026 },
6027 {
6028 .procname = "dad_transmits",
6029 .data = &ipv6_devconf.dad_transmits,
6030 .maxlen = sizeof(int),
6031 .mode = 0644,
6032 .proc_handler = proc_dointvec,
6033 },
6034 {
6035 .procname = "router_solicitations",
6036 .data = &ipv6_devconf.rtr_solicits,
6037 .maxlen = sizeof(int),
6038 .mode = 0644,
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07006039 .proc_handler = proc_dointvec_minmax,
6040 .extra1 = &minus_one,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006041 },
6042 {
6043 .procname = "router_solicitation_interval",
6044 .data = &ipv6_devconf.rtr_solicit_interval,
6045 .maxlen = sizeof(int),
6046 .mode = 0644,
6047 .proc_handler = proc_dointvec_jiffies,
6048 },
6049 {
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07006050 .procname = "router_solicitation_max_interval",
6051 .data = &ipv6_devconf.rtr_solicit_max_interval,
6052 .maxlen = sizeof(int),
6053 .mode = 0644,
6054 .proc_handler = proc_dointvec_jiffies,
6055 },
6056 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006057 .procname = "router_solicitation_delay",
6058 .data = &ipv6_devconf.rtr_solicit_delay,
6059 .maxlen = sizeof(int),
6060 .mode = 0644,
6061 .proc_handler = proc_dointvec_jiffies,
6062 },
6063 {
6064 .procname = "force_mld_version",
6065 .data = &ipv6_devconf.force_mld_version,
6066 .maxlen = sizeof(int),
6067 .mode = 0644,
6068 .proc_handler = proc_dointvec,
6069 },
6070 {
6071 .procname = "mldv1_unsolicited_report_interval",
6072 .data =
6073 &ipv6_devconf.mldv1_unsolicited_report_interval,
6074 .maxlen = sizeof(int),
6075 .mode = 0644,
6076 .proc_handler = proc_dointvec_ms_jiffies,
6077 },
6078 {
6079 .procname = "mldv2_unsolicited_report_interval",
6080 .data =
6081 &ipv6_devconf.mldv2_unsolicited_report_interval,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = proc_dointvec_ms_jiffies,
6085 },
6086 {
6087 .procname = "use_tempaddr",
6088 .data = &ipv6_devconf.use_tempaddr,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec,
6092 },
6093 {
6094 .procname = "temp_valid_lft",
6095 .data = &ipv6_devconf.temp_valid_lft,
6096 .maxlen = sizeof(int),
6097 .mode = 0644,
6098 .proc_handler = proc_dointvec,
6099 },
6100 {
6101 .procname = "temp_prefered_lft",
6102 .data = &ipv6_devconf.temp_prefered_lft,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "regen_max_retry",
6109 .data = &ipv6_devconf.regen_max_retry,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = proc_dointvec,
6113 },
6114 {
6115 .procname = "max_desync_factor",
6116 .data = &ipv6_devconf.max_desync_factor,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
6119 .proc_handler = proc_dointvec,
6120 },
6121 {
6122 .procname = "max_addresses",
6123 .data = &ipv6_devconf.max_addresses,
6124 .maxlen = sizeof(int),
6125 .mode = 0644,
6126 .proc_handler = proc_dointvec,
6127 },
6128 {
6129 .procname = "accept_ra_defrtr",
6130 .data = &ipv6_devconf.accept_ra_defrtr,
6131 .maxlen = sizeof(int),
6132 .mode = 0644,
6133 .proc_handler = proc_dointvec,
6134 },
6135 {
6136 .procname = "accept_ra_min_hop_limit",
6137 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6138 .maxlen = sizeof(int),
6139 .mode = 0644,
6140 .proc_handler = proc_dointvec,
6141 },
6142 {
6143 .procname = "accept_ra_pinfo",
6144 .data = &ipv6_devconf.accept_ra_pinfo,
6145 .maxlen = sizeof(int),
6146 .mode = 0644,
6147 .proc_handler = proc_dointvec,
6148 },
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08006149#ifdef CONFIG_IPV6_ROUTER_PREF
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006150 {
6151 .procname = "accept_ra_rtr_pref",
6152 .data = &ipv6_devconf.accept_ra_rtr_pref,
6153 .maxlen = sizeof(int),
6154 .mode = 0644,
6155 .proc_handler = proc_dointvec,
6156 },
6157 {
6158 .procname = "router_probe_interval",
6159 .data = &ipv6_devconf.rtr_probe_interval,
6160 .maxlen = sizeof(int),
6161 .mode = 0644,
6162 .proc_handler = proc_dointvec_jiffies,
6163 },
Neil Hormanfa03ef32007-01-30 14:30:10 -08006164#ifdef CONFIG_IPV6_ROUTE_INFO
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006165 {
Joel Scherpelzbbea1242017-03-22 18:19:04 +09006166 .procname = "accept_ra_rt_info_min_plen",
6167 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6168 .maxlen = sizeof(int),
6169 .mode = 0644,
6170 .proc_handler = proc_dointvec,
6171 },
6172 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006173 .procname = "accept_ra_rt_info_max_plen",
6174 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6175 .maxlen = sizeof(int),
6176 .mode = 0644,
6177 .proc_handler = proc_dointvec,
6178 },
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08006179#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08006180#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006181 {
6182 .procname = "proxy_ndp",
6183 .data = &ipv6_devconf.proxy_ndp,
6184 .maxlen = sizeof(int),
6185 .mode = 0644,
6186 .proc_handler = addrconf_sysctl_proxy_ndp,
6187 },
6188 {
6189 .procname = "accept_source_route",
6190 .data = &ipv6_devconf.accept_source_route,
6191 .maxlen = sizeof(int),
6192 .mode = 0644,
6193 .proc_handler = proc_dointvec,
6194 },
Neil Horman95c385b2007-04-25 17:08:10 -07006195#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006196 {
6197 .procname = "optimistic_dad",
6198 .data = &ipv6_devconf.optimistic_dad,
6199 .maxlen = sizeof(int),
6200 .mode = 0644,
6201 .proc_handler = proc_dointvec,
6202 },
6203 {
6204 .procname = "use_optimistic",
6205 .data = &ipv6_devconf.use_optimistic,
6206 .maxlen = sizeof(int),
6207 .mode = 0644,
6208 .proc_handler = proc_dointvec,
6209 },
Neil Horman95c385b2007-04-25 17:08:10 -07006210#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09006211#ifdef CONFIG_IPV6_MROUTE
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006212 {
6213 .procname = "mc_forwarding",
6214 .data = &ipv6_devconf.mc_forwarding,
6215 .maxlen = sizeof(int),
6216 .mode = 0444,
6217 .proc_handler = proc_dointvec,
6218 },
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09006219#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006220 {
6221 .procname = "disable_ipv6",
6222 .data = &ipv6_devconf.disable_ipv6,
6223 .maxlen = sizeof(int),
6224 .mode = 0644,
6225 .proc_handler = addrconf_sysctl_disable,
6226 },
6227 {
6228 .procname = "accept_dad",
6229 .data = &ipv6_devconf.accept_dad,
6230 .maxlen = sizeof(int),
6231 .mode = 0644,
6232 .proc_handler = proc_dointvec,
6233 },
6234 {
6235 .procname = "force_tllao",
6236 .data = &ipv6_devconf.force_tllao,
6237 .maxlen = sizeof(int),
6238 .mode = 0644,
6239 .proc_handler = proc_dointvec
6240 },
6241 {
6242 .procname = "ndisc_notify",
6243 .data = &ipv6_devconf.ndisc_notify,
6244 .maxlen = sizeof(int),
6245 .mode = 0644,
6246 .proc_handler = proc_dointvec
6247 },
6248 {
6249 .procname = "suppress_frag_ndisc",
6250 .data = &ipv6_devconf.suppress_frag_ndisc,
6251 .maxlen = sizeof(int),
6252 .mode = 0644,
6253 .proc_handler = proc_dointvec
6254 },
6255 {
6256 .procname = "accept_ra_from_local",
6257 .data = &ipv6_devconf.accept_ra_from_local,
6258 .maxlen = sizeof(int),
6259 .mode = 0644,
6260 .proc_handler = proc_dointvec,
6261 },
6262 {
6263 .procname = "accept_ra_mtu",
6264 .data = &ipv6_devconf.accept_ra_mtu,
6265 .maxlen = sizeof(int),
6266 .mode = 0644,
6267 .proc_handler = proc_dointvec,
6268 },
6269 {
6270 .procname = "stable_secret",
6271 .data = &ipv6_devconf.stable_secret,
6272 .maxlen = IPV6_MAX_STRLEN,
6273 .mode = 0600,
6274 .proc_handler = addrconf_sysctl_stable_secret,
6275 },
6276 {
6277 .procname = "use_oif_addrs_only",
6278 .data = &ipv6_devconf.use_oif_addrs_only,
6279 .maxlen = sizeof(int),
6280 .mode = 0644,
6281 .proc_handler = proc_dointvec,
6282 },
6283 {
6284 .procname = "ignore_routes_with_linkdown",
6285 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6286 .maxlen = sizeof(int),
6287 .mode = 0644,
6288 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6289 },
6290 {
6291 .procname = "drop_unicast_in_l2_multicast",
6292 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6293 .maxlen = sizeof(int),
6294 .mode = 0644,
6295 .proc_handler = proc_dointvec,
6296 },
6297 {
6298 .procname = "drop_unsolicited_na",
6299 .data = &ipv6_devconf.drop_unsolicited_na,
6300 .maxlen = sizeof(int),
6301 .mode = 0644,
6302 .proc_handler = proc_dointvec,
6303 },
6304 {
6305 .procname = "keep_addr_on_down",
6306 .data = &ipv6_devconf.keep_addr_on_down,
6307 .maxlen = sizeof(int),
6308 .mode = 0644,
6309 .proc_handler = proc_dointvec,
David Ahernf1705ec2016-02-24 09:25:37 -08006310
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006311 },
6312 {
David Lebrun1ababeb2016-11-08 14:57:39 +01006313 .procname = "seg6_enabled",
6314 .data = &ipv6_devconf.seg6_enabled,
6315 .maxlen = sizeof(int),
6316 .mode = 0644,
6317 .proc_handler = proc_dointvec,
6318 },
David Lebrunbf355b82016-11-08 14:57:42 +01006319#ifdef CONFIG_IPV6_SEG6_HMAC
6320 {
6321 .procname = "seg6_require_hmac",
6322 .data = &ipv6_devconf.seg6_require_hmac,
6323 .maxlen = sizeof(int),
6324 .mode = 0644,
6325 .proc_handler = proc_dointvec,
6326 },
6327#endif
David Lebrun1ababeb2016-11-08 14:57:39 +01006328 {
Erik Nordmarkadc176c2016-12-02 14:00:08 -08006329 .procname = "enhanced_dad",
6330 .data = &ipv6_devconf.enhanced_dad,
6331 .maxlen = sizeof(int),
6332 .mode = 0644,
6333 .proc_handler = proc_dointvec,
6334 },
6335 {
Felix Jiad35a00b2017-01-26 16:59:17 +13006336 .procname = "addr_gen_mode",
6337 .data = &ipv6_devconf.addr_gen_mode,
6338 .maxlen = sizeof(int),
6339 .mode = 0644,
6340 .proc_handler = addrconf_sysctl_addr_gen_mode,
6341 },
6342 {
David Forsterdf789fe2017-02-23 16:27:18 +00006343 .procname = "disable_policy",
6344 .data = &ipv6_devconf.disable_policy,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = addrconf_sysctl_disable_policy,
6348 },
6349 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006350 /* sentinel */
6351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006352};
6353
Pavel Emelyanovbff16c22008-01-10 17:42:13 -08006354static int __addrconf_sysctl_register(struct net *net, char *dev_name,
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006355 struct inet6_dev *idev, struct ipv6_devconf *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006356{
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006357 int i, ifindex;
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006358 struct ctl_table *table;
Eric W. Biederman6105e292012-04-19 13:41:24 +00006359 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
Pavel Emelyanov1dab6222007-12-02 00:59:38 +11006360
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006361 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6362 if (!table)
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006363 goto out;
6364
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006365 for (i = 0; table[i].data; i++) {
6366 table[i].data += (char *)p - (char *)&ipv6_devconf;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07006367 /* If one of these is already set, then it is not safe to
6368 * overwrite either of them: this makes proc_dointvec_minmax
6369 * usable.
6370 */
6371 if (!table[i].extra1 && !table[i].extra2) {
6372 table[i].extra1 = idev; /* embedded; no ref */
6373 table[i].extra2 = net;
6374 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006376
Eric W. Biederman6105e292012-04-19 13:41:24 +00006377 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006378
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006379 p->sysctl_header = register_net_sysctl(net, path, table);
6380 if (!p->sysctl_header)
Eric W. Biederman6105e292012-04-19 13:41:24 +00006381 goto free;
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006382
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006383 if (!strcmp(dev_name, "all"))
6384 ifindex = NETCONFA_IFINDEX_ALL;
6385 else if (!strcmp(dev_name, "default"))
6386 ifindex = NETCONFA_IFINDEX_DEFAULT;
6387 else
6388 ifindex = idev->dev->ifindex;
David Ahern85b3daa2017-03-28 14:28:04 -07006389 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6390 ifindex, p);
Pavel Emelyanov95897312008-01-10 17:41:45 -08006391 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006392
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006393free:
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006394 kfree(table);
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006395out:
Pavel Emelyanov95897312008-01-10 17:41:45 -08006396 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006397}
6398
David Ahern23452172017-03-28 14:28:05 -07006399static void __addrconf_sysctl_unregister(struct net *net,
6400 struct ipv6_devconf *p, int ifindex)
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006401{
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006402 struct ctl_table *table;
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006403
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006404 if (!p->sysctl_header)
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006405 return;
6406
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006407 table = p->sysctl_header->ctl_table_arg;
6408 unregister_net_sysctl_table(p->sysctl_header);
6409 p->sysctl_header = NULL;
6410 kfree(table);
David Ahern23452172017-03-28 14:28:05 -07006411
6412 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006413}
6414
WANG Conga317a2f2014-07-25 15:25:09 -07006415static int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006416{
WANG Conga317a2f2014-07-25 15:25:09 -07006417 int err;
6418
6419 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6420 return -EINVAL;
6421
6422 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6423 &ndisc_ifinfo_sysctl_change);
6424 if (err)
6425 return err;
6426 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6427 idev, &idev->cnf);
6428 if (err)
6429 neigh_sysctl_unregister(idev->nd_parms);
6430
6431 return err;
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006432}
6433
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006434static void addrconf_sysctl_unregister(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006435{
David Ahern23452172017-03-28 14:28:05 -07006436 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6437 idev->dev->ifindex);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006438 neigh_sysctl_unregister(idev->nd_parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006439}
6440
6441
6442#endif
6443
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006444static int __net_init addrconf_init_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006445{
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006446 int err = -ENOMEM;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006447 struct ipv6_devconf *all, *dflt;
6448
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006449 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006450 if (!all)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006451 goto err_alloc_all;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006452
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006453 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006454 if (!dflt)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006455 goto err_alloc_dflt;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006456
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006457 /* these will be inherited by all namespaces */
6458 dflt->autoconf = ipv6_defaults.autoconf;
6459 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006460
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01006461 dflt->stable_secret.initialized = false;
6462 all->stable_secret.initialized = false;
6463
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006464 net->ipv6.devconf_all = all;
6465 net->ipv6.devconf_dflt = dflt;
6466
6467#ifdef CONFIG_SYSCTL
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006468 err = __addrconf_sysctl_register(net, "all", NULL, all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006469 if (err < 0)
6470 goto err_reg_all;
6471
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006472 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006473 if (err < 0)
6474 goto err_reg_dflt;
6475#endif
6476 return 0;
6477
6478#ifdef CONFIG_SYSCTL
6479err_reg_dflt:
David Ahern23452172017-03-28 14:28:05 -07006480 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006481err_reg_all:
6482 kfree(dflt);
6483#endif
6484err_alloc_dflt:
6485 kfree(all);
6486err_alloc_all:
6487 return err;
6488}
6489
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006490static void __net_exit addrconf_exit_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006491{
6492#ifdef CONFIG_SYSCTL
David Ahern23452172017-03-28 14:28:05 -07006493 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6494 NETCONFA_IFINDEX_DEFAULT);
6495 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6496 NETCONFA_IFINDEX_ALL);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006497#endif
zhuyj73cf0e922014-11-26 10:25:58 +08006498 kfree(net->ipv6.devconf_dflt);
6499 kfree(net->ipv6.devconf_all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006500}
6501
6502static struct pernet_operations addrconf_ops = {
6503 .init = addrconf_init_net,
6504 .exit = addrconf_exit_net,
6505};
6506
Daniel Borkmann207895f2015-01-29 12:15:03 +01006507static struct rtnl_af_ops inet6_ops __read_mostly = {
Thomas Grafb382b192010-11-16 04:33:57 +00006508 .family = AF_INET6,
6509 .fill_link_af = inet6_fill_link_af,
6510 .get_link_af_size = inet6_get_link_af_size,
Daniel Borkmann11b1f822015-02-05 14:39:11 +01006511 .validate_link_af = inet6_validate_link_af,
Daniel Borkmannf53adae2013-04-08 04:01:30 +00006512 .set_link_af = inet6_set_link_af,
Thomas Grafb382b192010-11-16 04:33:57 +00006513};
6514
Linus Torvalds1da177e2005-04-16 15:20:36 -07006515/*
6516 * Init / cleanup code
6517 */
6518
6519int __init addrconf_init(void)
6520{
WANG Conga317a2f2014-07-25 15:25:09 -07006521 struct inet6_dev *idev;
stephen hemmingerc2e21292010-03-17 20:31:10 +00006522 int i, err;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006523
Stephen Hemmingere21e8462010-03-20 16:09:01 -07006524 err = ipv6_addr_label_init();
6525 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00006526 pr_crit("%s: cannot initialize default policy table: %d\n",
6527 __func__, err);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006528 goto out;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006529 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006530
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006531 err = register_pernet_subsys(&addrconf_ops);
6532 if (err < 0)
6533 goto out_addrlabel;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006534
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006535 addrconf_wq = create_workqueue("ipv6_addrconf");
6536 if (!addrconf_wq) {
6537 err = -ENOMEM;
6538 goto out_nowq;
6539 }
6540
Linus Torvalds1da177e2005-04-16 15:20:36 -07006541 /* The addrconf netdev notifier requires that loopback_dev
6542 * has it's ipv6 private information allocated and setup
6543 * before it can bring up and give link-local addresses
6544 * to other devices which are up.
6545 *
6546 * Unfortunately, loopback_dev is not necessarily the first
6547 * entry in the global dev_base list of net devices. In fact,
6548 * it is likely to be the very last entry on that list.
6549 * So this causes the notifier registry below to try and
6550 * give link-local addresses to all devices besides loopback_dev
6551 * first, then loopback_dev, which cases all the non-loopback_dev
6552 * devices to fail to get a link-local address.
6553 *
6554 * So, as a temporary fix, allocate the ipv6 structure for
6555 * loopback_dev first by hand.
6556 * Longer term, all of the dependencies ipv6 has upon the loopback
6557 * device and it being up should be removed.
6558 */
6559 rtnl_lock();
WANG Conga317a2f2014-07-25 15:25:09 -07006560 idev = ipv6_add_dev(init_net.loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006561 rtnl_unlock();
WANG Conga317a2f2014-07-25 15:25:09 -07006562 if (IS_ERR(idev)) {
6563 err = PTR_ERR(idev);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006564 goto errlo;
WANG Conga317a2f2014-07-25 15:25:09 -07006565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006566
WANG Cong2f460932017-05-03 22:07:31 -07006567 ip6_route_init_special_entries();
6568
stephen hemmingerc2e21292010-03-17 20:31:10 +00006569 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6570 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6571
Linus Torvalds1da177e2005-04-16 15:20:36 -07006572 register_netdevice_notifier(&ipv6_dev_notf);
6573
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006574 addrconf_verify();
Thomas Grafc127ea22007-03-22 11:58:32 -07006575
stephen hemminger3678a9d2013-12-30 10:41:32 -08006576 rtnl_af_register(&inet6_ops);
Thomas Grafb382b192010-11-16 04:33:57 +00006577
Greg Rosec7ac8672011-06-10 01:27:09 +00006578 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
Florian Westphalb97bac62017-08-09 20:41:48 +02006579 0);
Thomas Grafc127ea22007-03-22 11:58:32 -07006580 if (err < 0)
6581 goto errout;
6582
6583 /* Only the first call to __rtnl_register can fail */
Florian Westphalb97bac62017-08-09 20:41:48 +02006584 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6585 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
Greg Rosec7ac8672011-06-10 01:27:09 +00006586 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
Florian Westphalc24675f2017-10-11 10:28:01 +02006587 inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED);
Greg Rosec7ac8672011-06-10 01:27:09 +00006588 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
Florian Westphalb97bac62017-08-09 20:41:48 +02006589 inet6_dump_ifmcaddr, 0);
Greg Rosec7ac8672011-06-10 01:27:09 +00006590 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
Florian Westphalb97bac62017-08-09 20:41:48 +02006591 inet6_dump_ifacaddr, 0);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +00006592 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
Florian Westphal4ea26072017-10-11 10:28:00 +02006593 inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED);
Thomas Grafc127ea22007-03-22 11:58:32 -07006594
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006595 ipv6_addr_label_rtnl_register();
6596
Linus Torvalds1da177e2005-04-16 15:20:36 -07006597 return 0;
Thomas Grafc127ea22007-03-22 11:58:32 -07006598errout:
Thomas Grafb382b192010-11-16 04:33:57 +00006599 rtnl_af_unregister(&inet6_ops);
Thomas Grafc127ea22007-03-22 11:58:32 -07006600 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006601errlo:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006602 destroy_workqueue(addrconf_wq);
6603out_nowq:
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006604 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006605out_addrlabel:
6606 ipv6_addr_label_cleanup();
6607out:
Thomas Grafc127ea22007-03-22 11:58:32 -07006608 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006609}
6610
Daniel Lezcano09f77092007-12-13 05:34:58 -08006611void addrconf_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006612{
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006613 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006614 int i;
6615
6616 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006617 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006618 ipv6_addr_label_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006619
Florian Westphal5c451212017-10-04 15:58:49 +02006620 rtnl_af_unregister(&inet6_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006621
Florian Westphal5c451212017-10-04 15:58:49 +02006622 rtnl_lock();
Thomas Grafb382b192010-11-16 04:33:57 +00006623
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006624 /* clean dev list */
6625 for_each_netdev(&init_net, dev) {
6626 if (__in6_dev_get(dev) == NULL)
6627 continue;
6628 addrconf_ifdown(dev, 1);
6629 }
6630 addrconf_ifdown(init_net.loopback_dev, 2);
6631
Linus Torvalds1da177e2005-04-16 15:20:36 -07006632 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006633 * Check hash table.
6634 */
stephen hemminger5c578aed2010-03-17 20:31:11 +00006635 spin_lock_bh(&addrconf_hash_lock);
stephen hemmingerc2e21292010-03-17 20:31:10 +00006636 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6637 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
stephen hemminger5c578aed2010-03-17 20:31:11 +00006638 spin_unlock_bh(&addrconf_hash_lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006639 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006640 rtnl_unlock();
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006641
6642 destroy_workqueue(addrconf_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006643}