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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/socket.h>
47#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/net.h>
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +010049#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/in6.h>
51#include <linux/netdevice.h>
Thomas Graf18237302006-08-04 23:04:54 -070052#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
Randy Dunlap4fc268d2006-01-11 12:17:47 -080063#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <linux/delay.h>
65#include <linux/notifier.h>
Paulo Marques543537b2005-06-23 00:09:02 -070066#include <linux/string.h>
Eric Dumazetddbe5032012-07-18 08:11:12 +000067#include <linux/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020069#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <net/sock.h>
71#include <net/snmp.h>
72
Alexander Aring5241c2d2015-12-14 20:55:22 +010073#include <net/6lowpan.h>
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +000074#include <net/firewire.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
Thomas Graf5d620262006-08-15 00:35:02 -070082#include <net/netlink.h>
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -070083#include <net/pkt_sched.h>
David Ahernca254492015-10-12 11:47:10 -070084#include <net/l3mdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +000087#include <linux/netconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#include <linux/random.h>
Stephen Hemmingere21e8462010-03-20 16:09:01 -070089#include <linux/uaccess.h>
Herbert Xu7f7d9a62007-04-24 21:54:09 -070090#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040094#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
dingtianhongba3542e2013-08-17 10:27:04 +0800100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#else
dingtianhongba3542e2013-08-17 10:27:04 +0800102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
Thomas Graf18a31e12010-11-17 04:12:02 +0000106
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
Thomas Graf18a31e12010-11-17 04:12:02 +0000110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700115static inline s32 rfc3315_s14_backoff_init(s32 irt)
116{
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121}
122
123static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124{
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134}
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#ifdef CONFIG_SYSCTL
WANG Conga317a2f2014-07-25 15:25:09 -0700137static int addrconf_sysctl_register(struct inet6_dev *idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800138static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139#else
WANG Conga317a2f2014-07-25 15:25:09 -0700140static inline int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800141{
WANG Conga317a2f2014-07-25 15:25:09 -0700142 return 0;
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800143}
144
145static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146{
147}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148#endif
149
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200150static void ipv6_regen_rndid(struct inet6_dev *idev);
151static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900153static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static int ipv6_count_addresses(struct inet6_dev *idev);
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +0100155static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159/*
160 * Configured unicast address hash table
161 */
stephen hemmingerc2e21292010-03-17 20:31:10 +0000162static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
stephen hemminger5c578aed2010-03-17 20:31:11 +0000163static DEFINE_SPINLOCK(addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100165static void addrconf_verify(void);
166static void addrconf_verify_rtnl(void);
167static void addrconf_verify_work(struct work_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100169static struct workqueue_struct *addrconf_wq;
170static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
Jiri Pirko93d9b7d2010-03-10 10:28:56 +0000175static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177static int addrconf_ifdown(struct net_device *dev, int how);
178
Romain Kuntz21caa662013-01-09 21:06:03 +0000179static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
David S. Millercf22f9a2012-04-14 21:37:40 -0400184static void addrconf_dad_start(struct inet6_ifaddr *ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100185static void addrconf_dad_work(struct work_struct *w);
Paolo Abeni764d3be2016-11-22 16:57:40 +0100186static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +0900187static void addrconf_dad_run(struct inet6_dev *idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static void addrconf_rs_timer(unsigned long data);
189static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900192static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 struct prefix_info *pinfo);
David S. Miller3e81c6d2010-03-20 16:18:00 -0700194static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Adrian Bunk888c8482008-07-22 14:21:58 -0700197static struct ipv6_devconf ipv6_devconf __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +0200205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
Ian Morris67ba4152014-08-24 21:53:10 +0100212 .use_tempaddr = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 .max_addresses = IPV6_MAX_ADDRESSES,
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -0800218 .accept_ra_defrtr = 1,
Ben Greeard9333192014-06-25 14:44:53 -0700219 .accept_ra_from_local = 0,
Hangbin Liu8013d1d2015-07-30 14:28:42 +0800220 .accept_ra_min_hop_limit= 1,
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -0800221 .accept_ra_pinfo = 1,
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
YOSHIFUJI Hideaki52e163562006-03-20 17:05:47 -0800224 .rtr_probe_interval = 60 * HZ,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800228#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -0700229 .proxy_ndp = 0,
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700230 .accept_source_route = 0, /* we do not accept RH0 by default. */
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +0900231 .disable_ipv6 = 0,
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900232 .accept_dad = 1,
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +0200233 .suppress_frag_ndisc = 1,
Harout Hedeshianc2943f12015-01-20 10:06:05 -0700234 .accept_ra_mtu = 1,
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100235 .stable_secret = {
236 .initialized = false,
Erik Kline3985e8a2015-07-22 16:38:25 +0900237 },
238 .use_oif_addrs_only = 0,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400239 .ignore_routes_with_linkdown = 0,
David Ahernf1705ec2016-02-24 09:25:37 -0800240 .keep_addr_on_down = 0,
David Lebrun1ababeb2016-11-08 14:57:39 +0100241 .seg6_enabled = 0,
David Lebrunbf355b82016-11-08 14:57:42 +0100242#ifdef CONFIG_IPV6_SEG6_HMAC
243 .seg6_require_hmac = 0,
244#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800245 .enhanced_dad = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246};
247
Brian Haleyab32ea52006-09-22 14:15:41 -0700248static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 .forwarding = 0,
250 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
251 .mtu6 = IPV6_MIN_MTU,
252 .accept_ra = 1,
253 .accept_redirects = 1,
254 .autoconf = 1,
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +0200255 .force_mld_version = 0,
256 .mldv1_unsolicited_report_interval = 10 * HZ,
257 .mldv2_unsolicited_report_interval = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 .dad_transmits = 1,
259 .rtr_solicits = MAX_RTR_SOLICITATIONS,
260 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700261 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 .use_tempaddr = 0,
264 .temp_valid_lft = TEMP_VALID_LIFETIME,
265 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
266 .regen_max_retry = REGEN_MAX_RETRY,
267 .max_desync_factor = MAX_DESYNC_FACTOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 .max_addresses = IPV6_MAX_ADDRESSES,
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -0800269 .accept_ra_defrtr = 1,
Ben Greeard9333192014-06-25 14:44:53 -0700270 .accept_ra_from_local = 0,
Hangbin Liu8013d1d2015-07-30 14:28:42 +0800271 .accept_ra_min_hop_limit= 1,
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -0800272 .accept_ra_pinfo = 1,
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800273#ifdef CONFIG_IPV6_ROUTER_PREF
274 .accept_ra_rtr_pref = 1,
YOSHIFUJI Hideaki52e163562006-03-20 17:05:47 -0800275 .rtr_probe_interval = 60 * HZ,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800276#ifdef CONFIG_IPV6_ROUTE_INFO
277 .accept_ra_rt_info_max_plen = 0,
278#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800279#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -0700280 .proxy_ndp = 0,
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700281 .accept_source_route = 0, /* we do not accept RH0 by default. */
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +0900282 .disable_ipv6 = 0,
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900283 .accept_dad = 1,
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +0200284 .suppress_frag_ndisc = 1,
Harout Hedeshianc2943f12015-01-20 10:06:05 -0700285 .accept_ra_mtu = 1,
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100286 .stable_secret = {
287 .initialized = false,
288 },
Erik Kline3985e8a2015-07-22 16:38:25 +0900289 .use_oif_addrs_only = 0,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400290 .ignore_routes_with_linkdown = 0,
David Ahernf1705ec2016-02-24 09:25:37 -0800291 .keep_addr_on_down = 0,
David Lebrun1ababeb2016-11-08 14:57:39 +0100292 .seg6_enabled = 0,
David Lebrunbf355b82016-11-08 14:57:42 +0100293#ifdef CONFIG_IPV6_SEG6_HMAC
294 .seg6_require_hmac = 0,
295#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -0800296 .enhanced_dad = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297};
298
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700299/* Check if a valid qdisc is available */
David S. Miller05297942008-07-08 23:01:27 -0700300static inline bool addrconf_qdisc_ok(const struct net_device *dev)
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700301{
David S. Miller05297942008-07-08 23:01:27 -0700302 return !qdisc_tx_is_noop(dev);
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700303}
304
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200305static void addrconf_del_rs_timer(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200307 if (del_timer(&idev->rs_timer))
308 __in6_dev_put(idev);
309}
310
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100311static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200312{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100313 if (cancel_delayed_work(&ifp->dad_work))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 __in6_ifa_put(ifp);
315}
316
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200317static void addrconf_mod_rs_timer(struct inet6_dev *idev,
318 unsigned long when)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200320 if (!timer_pending(&idev->rs_timer))
321 in6_dev_hold(idev);
322 mod_timer(&idev->rs_timer, jiffies + when);
323}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100325static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
326 unsigned long delay)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200327{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100328 if (!delayed_work_pending(&ifp->dad_work))
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200329 in6_ifa_hold(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100330 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700333static int snmp6_alloc_dev(struct inet6_dev *idev)
334{
John Stultz827da442013-10-07 15:51:58 -0700335 int i;
336
WANG Cong698365f2014-05-05 15:55:55 -0700337 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
338 if (!idev->stats.ipv6)
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700339 goto err_ip;
John Stultz827da442013-10-07 15:51:58 -0700340
341 for_each_possible_cpu(i) {
342 struct ipstats_mib *addrconf_stats;
WANG Cong698365f2014-05-05 15:55:55 -0700343 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
John Stultz827da442013-10-07 15:51:58 -0700344 u64_stats_init(&addrconf_stats->syncp);
John Stultz827da442013-10-07 15:51:58 -0700345 }
346
347
Eric Dumazetbe281e52011-05-19 01:14:23 +0000348 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6dev)
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700351 goto err_icmp;
Eric Dumazetbe281e52011-05-19 01:14:23 +0000352 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
353 GFP_KERNEL);
354 if (!idev->stats.icmpv6msgdev)
David L Stevens14878f72007-09-16 16:52:35 -0700355 goto err_icmpmsg;
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700356
357 return 0;
358
David L Stevens14878f72007-09-16 16:52:35 -0700359err_icmpmsg:
Eric Dumazetbe281e52011-05-19 01:14:23 +0000360 kfree(idev->stats.icmpv6dev);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700361err_icmp:
WANG Cong698365f2014-05-05 15:55:55 -0700362 free_percpu(idev->stats.ipv6);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700363err_ip:
Pavel Emelyanovaaf70ec2007-10-17 21:25:32 -0700364 return -ENOMEM;
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700365}
366
Eldad Zack8e5e8f32012-04-01 07:49:08 +0000367static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
369 struct inet6_dev *ndev;
WANG Conga317a2f2014-07-25 15:25:09 -0700370 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 ASSERT_RTNL();
373
374 if (dev->mtu < IPV6_MIN_MTU)
WANG Conga317a2f2014-07-25 15:25:09 -0700375 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900377 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100378 if (!ndev)
WANG Conga317a2f2014-07-25 15:25:09 -0700379 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Ingo Oeser322f74a2006-03-20 23:01:47 -0800381 rwlock_init(&ndev->lock);
382 ndev->dev = dev;
stephen hemminger502a2ff2010-03-17 20:31:13 +0000383 INIT_LIST_HEAD(&ndev->addr_list);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200384 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
385 (unsigned long)ndev);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
Hannes Frederic Sowa9b29c692015-12-15 22:59:12 +0100387
388 if (ndev->cnf.stable_secret.initialized)
389 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
390 else
391 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
392
Ingo Oeser322f74a2006-03-20 23:01:47 -0800393 ndev->cnf.mtu6 = dev->mtu;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800394 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
Ian Morris63159f22015-03-29 14:00:04 +0100395 if (!ndev->nd_parms) {
Ingo Oeser322f74a2006-03-20 23:01:47 -0800396 kfree(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700397 return ERR_PTR(err);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800398 }
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700399 if (ndev->cnf.forwarding)
400 dev_disable_lro(dev);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800401 /* We refer to the device */
402 dev_hold(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Ingo Oeser322f74a2006-03-20 23:01:47 -0800404 if (snmp6_alloc_dev(ndev) < 0) {
dingtianhongba3542e2013-08-17 10:27:04 +0800405 ADBG(KERN_WARNING
Joe Perchesf3213832012-05-15 14:11:53 +0000406 "%s: cannot allocate memory for statistics; dev=%s.\n",
dingtianhongba3542e2013-08-17 10:27:04 +0800407 __func__, dev->name);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800408 neigh_parms_release(&nd_tbl, ndev->nd_parms);
Roy Li8603e332011-09-20 15:10:16 -0400409 dev_put(dev);
410 kfree(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700411 return ERR_PTR(err);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800412 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Ingo Oeser322f74a2006-03-20 23:01:47 -0800414 if (snmp6_register_dev(ndev) < 0) {
dingtianhongba3542e2013-08-17 10:27:04 +0800415 ADBG(KERN_WARNING
Joe Perchesf3213832012-05-15 14:11:53 +0000416 "%s: cannot create /proc/net/dev_snmp6/%s\n",
dingtianhongba3542e2013-08-17 10:27:04 +0800417 __func__, dev->name);
WANG Conga317a2f2014-07-25 15:25:09 -0700418 goto err_release;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800419 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200421 /* One reference from device. */
Ingo Oeser322f74a2006-03-20 23:01:47 -0800422 in6_dev_hold(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900424 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
425 ndev->cnf.accept_dad = -1;
426
Amerigo Wang07a93622012-10-29 16:23:10 +0000427#if IS_ENABLED(CONFIG_IPV6_SIT)
YOSHIFUJI Hideakib077d7a2008-04-13 23:42:18 -0700428 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
Joe Perchesf3213832012-05-15 14:11:53 +0000429 pr_info("%s: Disabled Multicast RS\n", dev->name);
YOSHIFUJI Hideakib077d7a2008-04-13 23:42:18 -0700430 ndev->cnf.rtr_solicits = 0;
431 }
432#endif
433
stephen hemminger372e6c82010-03-17 20:31:09 +0000434 INIT_LIST_HEAD(&ndev->tempaddr_list);
Jiri Bohac76506a92016-10-13 18:52:15 +0200435 ndev->desync_factor = U32_MAX;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800436 if ((dev->flags&IFF_LOOPBACK) ||
437 dev->type == ARPHRD_TUNNEL ||
YOSHIFUJI Hideaki9625ed72008-04-13 23:47:11 -0700438 dev->type == ARPHRD_TUNNEL6 ||
Joerg Roedel0be669b2006-10-10 14:49:53 -0700439 dev->type == ARPHRD_SIT ||
Joerg Roedel0be669b2006-10-10 14:49:53 -0700440 dev->type == ARPHRD_NONE) {
Ingo Oeser322f74a2006-03-20 23:01:47 -0800441 ndev->cnf.use_tempaddr = -1;
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200442 } else
443 ipv6_regen_rndid(ndev);
David S. Miller5d9efa72013-10-28 20:07:50 -0400444
Daniel Borkmann914faa12013-04-09 03:47:14 +0000445 ndev->token = in6addr_any;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800446
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700447 if (netif_running(dev) && addrconf_qdisc_ok(dev))
Herbert Xu53aadcc2007-03-27 14:31:52 -0700448 ndev->if_flags |= IF_READY;
449
Ingo Oeser322f74a2006-03-20 23:01:47 -0800450 ipv6_mc_init_dev(ndev);
451 ndev->tstamp = jiffies;
WANG Conga317a2f2014-07-25 15:25:09 -0700452 err = addrconf_sysctl_register(ndev);
453 if (err) {
454 ipv6_mc_destroy_dev(ndev);
Sabrina Dubroca2a189f92015-11-04 14:47:53 +0100455 snmp6_unregister_dev(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700456 goto err_release;
457 }
David L Stevens30c4cf52007-01-04 12:31:14 -0800458 /* protected by rtnl_lock */
Eric Dumazetcf778b02012-01-12 04:41:32 +0000459 rcu_assign_pointer(dev->ip6_ptr, ndev);
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800460
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000461 /* Join interface-local all-node multicast group */
462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
463
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800464 /* Join all-node multicast group */
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800466
Li Weid6ddef92012-03-05 14:45:17 +0000467 /* Join all-router multicast group if forwarding is set */
Li Wei8b2aaed2012-03-07 14:58:07 +0000468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
Li Weid6ddef92012-03-05 14:45:17 +0000469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 return ndev;
WANG Conga317a2f2014-07-25 15:25:09 -0700472
473err_release:
474 neigh_parms_release(&nd_tbl, ndev->nd_parms);
475 ndev->dead = 1;
476 in6_dev_finish_destroy(ndev);
477 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478}
479
Eldad Zack8e5e8f32012-04-01 07:49:08 +0000480static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
482 struct inet6_dev *idev;
483
484 ASSERT_RTNL();
485
Stephen Hemmingere21e8462010-03-20 16:09:01 -0700486 idev = __in6_dev_get(dev);
487 if (!idev) {
488 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -0700489 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return NULL;
491 }
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +0900492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (dev->flags&IFF_UP)
494 ipv6_mc_up(idev);
495 return idev;
496}
497
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000498static int inet6_netconf_msgsize_devconf(int type)
499{
500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
501 + nla_total_size(4); /* NETCONFA_IFINDEX */
Zhang Shengju136ba622016-03-10 08:55:50 +0000502 bool all = false;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000503
Zhang Shengju136ba622016-03-10 08:55:50 +0000504 if (type == NETCONFA_ALL)
505 all = true;
506
507 if (all || type == NETCONFA_FORWARDING)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000508 size += nla_total_size(4);
David S. Millerb1afce92012-12-04 14:46:34 -0500509#ifdef CONFIG_IPV6_MROUTE
Zhang Shengju136ba622016-03-10 08:55:50 +0000510 if (all || type == NETCONFA_MC_FORWARDING)
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000511 size += nla_total_size(4);
David S. Millerb1afce92012-12-04 14:46:34 -0500512#endif
Zhang Shengju136ba622016-03-10 08:55:50 +0000513 if (all || type == NETCONFA_PROXY_NEIGH)
stephen hemmingerc92d5492013-12-17 22:37:14 -0800514 size += nla_total_size(4);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000515
Zhang Shengju136ba622016-03-10 08:55:50 +0000516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
Andy Gospodarek35103d12015-08-13 10:39:01 -0400517 size += nla_total_size(4);
518
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000519 return size;
520}
521
522static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
523 struct ipv6_devconf *devconf, u32 portid,
524 u32 seq, int event, unsigned int flags,
525 int type)
526{
527 struct nlmsghdr *nlh;
528 struct netconfmsg *ncm;
Zhang Shengju136ba622016-03-10 08:55:50 +0000529 bool all = false;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000530
531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
532 flags);
Ian Morris63159f22015-03-29 14:00:04 +0100533 if (!nlh)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000534 return -EMSGSIZE;
535
Zhang Shengju136ba622016-03-10 08:55:50 +0000536 if (type == NETCONFA_ALL)
537 all = true;
538
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000539 ncm = nlmsg_data(nlh);
540 ncm->ncm_family = AF_INET6;
541
542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
543 goto nla_put_failure;
544
Zhang Shengju136ba622016-03-10 08:55:50 +0000545 if ((all || type == NETCONFA_FORWARDING) &&
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000546 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
547 goto nla_put_failure;
David S. Millerb1afce92012-12-04 14:46:34 -0500548#ifdef CONFIG_IPV6_MROUTE
Zhang Shengju136ba622016-03-10 08:55:50 +0000549 if ((all || type == NETCONFA_MC_FORWARDING) &&
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000550 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
551 devconf->mc_forwarding) < 0)
552 goto nla_put_failure;
David S. Millerb1afce92012-12-04 14:46:34 -0500553#endif
Zhang Shengju136ba622016-03-10 08:55:50 +0000554 if ((all || type == NETCONFA_PROXY_NEIGH) &&
stephen hemmingerc92d5492013-12-17 22:37:14 -0800555 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
556 goto nla_put_failure;
557
Zhang Shengju136ba622016-03-10 08:55:50 +0000558 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
Andy Gospodarek35103d12015-08-13 10:39:01 -0400559 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
560 devconf->ignore_routes_with_linkdown) < 0)
561 goto nla_put_failure;
562
Johannes Berg053c0952015-01-16 22:09:00 +0100563 nlmsg_end(skb, nlh);
564 return 0;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000565
566nla_put_failure:
567 nlmsg_cancel(skb, nlh);
568 return -EMSGSIZE;
569}
570
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000571void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
572 struct ipv6_devconf *devconf)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000573{
574 struct sk_buff *skb;
575 int err = -ENOBUFS;
576
Eric Dumazet927265b2016-07-08 05:46:04 +0200577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100578 if (!skb)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000579 goto errout;
580
581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
582 RTM_NEWNETCONF, 0, type);
583 if (err < 0) {
584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
585 WARN_ON(err == -EMSGSIZE);
586 kfree_skb(skb);
587 goto errout;
588 }
Eric Dumazet927265b2016-07-08 05:46:04 +0200589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000590 return;
591errout:
Cong Dingbd779022012-12-18 12:08:56 +0000592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000593}
594
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000595static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
596 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
597 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
stephen hemmingerc92d5492013-12-17 22:37:14 -0800598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
Andy Gospodarek35103d12015-08-13 10:39:01 -0400599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000600};
601
602static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
Thomas Graf661d2962013-03-21 07:45:29 +0000603 struct nlmsghdr *nlh)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000604{
605 struct net *net = sock_net(in_skb->sk);
606 struct nlattr *tb[NETCONFA_MAX+1];
607 struct netconfmsg *ncm;
608 struct sk_buff *skb;
609 struct ipv6_devconf *devconf;
610 struct inet6_dev *in6_dev;
611 struct net_device *dev;
612 int ifindex;
613 int err;
614
615 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
616 devconf_ipv6_policy);
617 if (err < 0)
618 goto errout;
619
Anton Protopopova97eb332016-02-16 21:43:16 -0500620 err = -EINVAL;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000621 if (!tb[NETCONFA_IFINDEX])
622 goto errout;
623
624 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
625 switch (ifindex) {
626 case NETCONFA_IFINDEX_ALL:
627 devconf = net->ipv6.devconf_all;
628 break;
629 case NETCONFA_IFINDEX_DEFAULT:
630 devconf = net->ipv6.devconf_dflt;
631 break;
632 default:
633 dev = __dev_get_by_index(net, ifindex);
Ian Morris63159f22015-03-29 14:00:04 +0100634 if (!dev)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000635 goto errout;
636 in6_dev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +0100637 if (!in6_dev)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000638 goto errout;
639 devconf = &in6_dev->cnf;
640 break;
641 }
642
643 err = -ENOBUFS;
Zhang Shengju136ba622016-03-10 08:55:50 +0000644 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +0100645 if (!skb)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000646 goto errout;
647
648 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
649 NETLINK_CB(in_skb).portid,
650 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
Zhang Shengju136ba622016-03-10 08:55:50 +0000651 NETCONFA_ALL);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000652 if (err < 0) {
653 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
654 WARN_ON(err == -EMSGSIZE);
655 kfree_skb(skb);
656 goto errout;
657 }
658 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
659errout:
660 return err;
661}
662
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000663static int inet6_netconf_dump_devconf(struct sk_buff *skb,
664 struct netlink_callback *cb)
665{
666 struct net *net = sock_net(skb->sk);
667 int h, s_h;
668 int idx, s_idx;
669 struct net_device *dev;
670 struct inet6_dev *idev;
671 struct hlist_head *head;
672
673 s_h = cb->args[0];
674 s_idx = idx = cb->args[1];
675
676 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
677 idx = 0;
678 head = &net->dev_index_head[h];
679 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000680 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
681 net->dev_base_seq;
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000682 hlist_for_each_entry_rcu(dev, head, index_hlist) {
683 if (idx < s_idx)
684 goto cont;
685 idev = __in6_dev_get(dev);
686 if (!idev)
687 goto cont;
688
689 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
690 &idev->cnf,
691 NETLINK_CB(cb->skb).portid,
692 cb->nlh->nlmsg_seq,
693 RTM_NEWNETCONF,
694 NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000695 NETCONFA_ALL) < 0) {
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000696 rcu_read_unlock();
697 goto done;
698 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000699 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000700cont:
701 idx++;
702 }
703 rcu_read_unlock();
704 }
705 if (h == NETDEV_HASHENTRIES) {
706 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
707 net->ipv6.devconf_all,
708 NETLINK_CB(cb->skb).portid,
709 cb->nlh->nlmsg_seq,
710 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000711 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000712 goto done;
713 else
714 h++;
715 }
716 if (h == NETDEV_HASHENTRIES + 1) {
717 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
718 net->ipv6.devconf_dflt,
719 NETLINK_CB(cb->skb).portid,
720 cb->nlh->nlmsg_seq,
721 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000722 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000723 goto done;
724 else
725 h++;
726 }
727done:
728 cb->args[0] = h;
729 cb->args[1] = idx;
730
731 return skb->len;
732}
733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734#ifdef CONFIG_SYSCTL
735static void dev_forward_change(struct inet6_dev *idev)
736{
737 struct net_device *dev;
738 struct inet6_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740 if (!idev)
741 return;
742 dev = idev->dev;
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700743 if (idev->cnf.forwarding)
744 dev_disable_lro(dev);
Amerigo Wang1a940832012-10-28 17:43:53 +0000745 if (dev->flags & IFF_MULTICAST) {
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000746 if (idev->cnf.forwarding) {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900747 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000748 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
749 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
750 } else {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900751 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000752 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
753 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
754 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 }
stephen hemminger502a2ff2010-03-17 20:31:13 +0000756
757 list_for_each_entry(ifa, &idev->addr_list, if_list) {
Michal Wrobel2c12a742007-02-26 15:36:10 -0800758 if (ifa->flags&IFA_F_TENTATIVE)
759 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 if (idev->cnf.forwarding)
761 addrconf_join_anycast(ifa);
762 else
763 addrconf_leave_anycast(ifa);
764 }
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000765 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
766 dev->ifindex, &idev->cnf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767}
768
769
Pavel Emelyanove1869322008-01-10 17:43:50 -0800770static void addrconf_forward_change(struct net *net, __s32 newf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
772 struct net_device *dev;
773 struct inet6_dev *idev;
774
Ben Hutchings4acd4942012-08-14 08:54:51 +0000775 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 idev = __in6_dev_get(dev);
777 if (idev) {
Pavel Emelyanove1869322008-01-10 17:43:50 -0800778 int changed = (!idev->cnf.forwarding) ^ (!newf);
779 idev->cnf.forwarding = newf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if (changed)
781 dev_forward_change(idev);
782 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784}
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800785
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000786static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800787{
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800788 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000789 int old;
790
791 if (!rtnl_trylock())
792 return restart_syscall();
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800793
794 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000795 old = *p;
796 *p = newf;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800797
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000798 if (p == &net->ipv6.devconf_dflt->forwarding) {
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000799 if ((!newf) ^ (!old))
800 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
801 NETCONFA_IFINDEX_DEFAULT,
802 net->ipv6.devconf_dflt);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000803 rtnl_unlock();
804 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +0000805 }
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000806
Pavel Emelyanove1869322008-01-10 17:43:50 -0800807 if (p == &net->ipv6.devconf_all->forwarding) {
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200808 int old_dflt = net->ipv6.devconf_dflt->forwarding;
809
Pavel Emelyanove1869322008-01-10 17:43:50 -0800810 net->ipv6.devconf_dflt->forwarding = newf;
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200811 if ((!newf) ^ (!old_dflt))
812 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
813 NETCONFA_IFINDEX_DEFAULT,
814 net->ipv6.devconf_dflt);
815
Pavel Emelyanove1869322008-01-10 17:43:50 -0800816 addrconf_forward_change(net, newf);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000817 if ((!newf) ^ (!old))
818 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
819 NETCONFA_IFINDEX_ALL,
820 net->ipv6.devconf_all);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000821 } else if ((!newf) ^ (!old))
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800822 dev_forward_change((struct inet6_dev *)table->extra1);
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700823 rtnl_unlock();
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800824
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000825 if (newf)
Daniel Lezcano7b4da532008-03-04 13:47:14 -0800826 rt6_purge_dflt_routers(net);
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000827 return 1;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800828}
Andy Gospodarek35103d12015-08-13 10:39:01 -0400829
830static void addrconf_linkdown_change(struct net *net, __s32 newf)
831{
832 struct net_device *dev;
833 struct inet6_dev *idev;
834
835 for_each_netdev(net, dev) {
836 idev = __in6_dev_get(dev);
837 if (idev) {
838 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
839
840 idev->cnf.ignore_routes_with_linkdown = newf;
841 if (changed)
842 inet6_netconf_notify_devconf(dev_net(dev),
843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
844 dev->ifindex,
845 &idev->cnf);
846 }
847 }
848}
849
850static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
851{
852 struct net *net;
853 int old;
854
855 if (!rtnl_trylock())
856 return restart_syscall();
857
858 net = (struct net *)table->extra2;
859 old = *p;
860 *p = newf;
861
862 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
863 if ((!newf) ^ (!old))
864 inet6_netconf_notify_devconf(net,
865 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
866 NETCONFA_IFINDEX_DEFAULT,
867 net->ipv6.devconf_dflt);
868 rtnl_unlock();
869 return 0;
870 }
871
872 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
873 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
874 addrconf_linkdown_change(net, newf);
875 if ((!newf) ^ (!old))
876 inet6_netconf_notify_devconf(net,
877 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
880 }
881 rtnl_unlock();
882
883 return 1;
884}
885
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886#endif
887
stephen hemminger5c578aed2010-03-17 20:31:11 +0000888/* Nobody refers to this ifaddr, destroy it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
890{
stephen hemmingerc2e21292010-03-17 20:31:10 +0000891 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893#ifdef NET_REFCNT_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +0000894 pr_debug("%s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895#endif
896
897 in6_dev_put(ifp->idev);
898
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100899 if (cancel_delayed_work(&ifp->dad_work))
900 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
901 ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Herbert Xue9d3e082010-05-18 15:36:06 -0700903 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
Joe Perchesf3213832012-05-15 14:11:53 +0000904 pr_warn("Freeing alive inet6 address %p\n", ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 return;
906 }
Amerigo Wang94e187c2012-10-29 00:13:19 +0000907 ip6_rt_put(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
Lai Jiangshane5785982011-03-15 18:00:14 +0800909 kfree_rcu(ifp, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910}
911
Brian Haleye55ffac2006-07-10 15:25:51 -0700912static void
913ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
914{
stephen hemminger502a2ff2010-03-17 20:31:13 +0000915 struct list_head *p;
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700916 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
Brian Haleye55ffac2006-07-10 15:25:51 -0700917
918 /*
919 * Each device address list is sorted in order of scope -
920 * global before linklocal.
921 */
stephen hemminger502a2ff2010-03-17 20:31:13 +0000922 list_for_each(p, &idev->addr_list) {
923 struct inet6_ifaddr *ifa
924 = list_entry(p, struct inet6_ifaddr, if_list);
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700925 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
Brian Haleye55ffac2006-07-10 15:25:51 -0700926 break;
927 }
928
David S. Millerb54c9b92010-03-25 21:25:30 -0700929 list_add_tail(&ifp->if_list, p);
Brian Haleye55ffac2006-07-10 15:25:51 -0700930}
931
Eric Dumazetddbe5032012-07-18 08:11:12 +0000932static u32 inet6_addr_hash(const struct in6_addr *addr)
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900933{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000934 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900935}
936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937/* On success it returns ifp with increased reference count */
938
939static struct inet6_ifaddr *
Jiri Pirko3f8f5292013-08-01 10:41:27 +0200940ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
941 const struct in6_addr *peer_addr, int pfxlen,
Jiri Benc8a226b22013-08-01 10:41:28 +0200942 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
944 struct inet6_ifaddr *ifa = NULL;
945 struct rt6_info *rt;
stephen hemminger3a88a812010-03-17 20:31:12 +0000946 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 int err = 0;
YOSHIFUJI Hideakid68b8272008-06-25 16:26:47 +0900948 int addr_type = ipv6_addr_type(addr);
949
950 if (addr_type == IPV6_ADDR_ANY ||
951 addr_type & IPV6_ADDR_MULTICAST ||
952 (!(idev->dev->flags & IFF_LOOPBACK) &&
953 addr_type & IPV6_ADDR_LOOPBACK))
954 return ERR_PTR(-EADDRNOTAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700956 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 if (idev->dead) {
958 err = -ENODEV; /*XXX*/
959 goto out2;
960 }
961
Brian Haley56d417b2009-06-01 03:07:33 -0700962 if (idev->cnf.disable_ipv6) {
Brian Haley9bdd8d42009-03-18 18:22:48 -0700963 err = -EACCES;
964 goto out2;
965 }
966
stephen hemminger5c578aed2010-03-17 20:31:11 +0000967 spin_lock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
969 /* Ignore adding duplicate addresses on an interface */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900970 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
dingtianhongba3542e2013-08-17 10:27:04 +0800971 ADBG("ipv6_add_addr: already assigned\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 err = -EEXIST;
973 goto out;
974 }
975
Ingo Oeser322f74a2006-03-20 23:01:47 -0800976 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
Ian Morris63159f22015-03-29 14:00:04 +0100978 if (!ifa) {
dingtianhongba3542e2013-08-17 10:27:04 +0800979 ADBG("ipv6_add_addr: malloc failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 err = -ENOBUFS;
981 goto out;
982 }
983
David S. Miller8f031512011-12-06 16:48:14 -0500984 rt = addrconf_dst_alloc(idev, addr, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 if (IS_ERR(rt)) {
986 err = PTR_ERR(rt);
987 goto out;
988 }
989
Jiri Pirkobba24892013-12-07 19:26:57 +0100990 neigh_parms_data_state_setall(idev->nd_parms);
991
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000992 ifa->addr = *addr;
Jiri Pirko3f8f5292013-08-01 10:41:27 +0200993 if (peer_addr)
994 ifa->peer_addr = *peer_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
996 spin_lock_init(&ifa->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100997 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
stephen hemmingerc2e21292010-03-17 20:31:10 +0000998 INIT_HLIST_NODE(&ifa->addr_lst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 ifa->scope = scope;
1000 ifa->prefix_len = pfxlen;
1001 ifa->flags = flags | IFA_F_TENTATIVE;
Jiri Benc8a226b22013-08-01 10:41:28 +02001002 ifa->valid_lft = valid_lft;
1003 ifa->prefered_lft = prefered_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 ifa->cstamp = ifa->tstamp = jiffies;
Daniel Borkmann617fe292013-04-09 03:47:16 +00001005 ifa->tokenized = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Keir Fraser57f5f542006-08-29 02:43:49 -07001007 ifa->rt = rt;
1008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 ifa->idev = idev;
1010 in6_dev_hold(idev);
1011 /* For caller */
1012 in6_ifa_hold(ifa);
1013
1014 /* Add to big hash table */
Eric Dumazetddbe5032012-07-18 08:11:12 +00001015 hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
stephen hemminger5c578aed2010-03-17 20:31:11 +00001017 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001018 spin_unlock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
1020 write_lock(&idev->lock);
1021 /* Add to inet6_dev unicast addr list. */
Brian Haleye55ffac2006-07-10 15:25:51 -07001022 ipv6_link_dev_addr(idev, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 if (ifa->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001025 list_add(&ifa->tmp_list, &idev->tempaddr_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 in6_ifa_hold(ifa);
1027 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 in6_ifa_hold(ifa);
1030 write_unlock(&idev->lock);
1031out2:
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001032 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
YOSHIFUJI Hideakifd928332005-04-19 22:27:09 -07001034 if (likely(err == 0))
Cong Wangf88c91d2013-04-14 23:18:43 +08001035 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 else {
1037 kfree(ifa);
1038 ifa = ERR_PTR(err);
1039 }
1040
1041 return ifa;
1042out:
stephen hemminger5c578aed2010-03-17 20:31:11 +00001043 spin_unlock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 goto out2;
1045}
1046
Thomas Haller5b84efe2014-01-15 15:36:59 +01001047enum cleanup_prefix_rt_t {
1048 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1049 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1050 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1051};
1052
1053/*
1054 * Check, whether the prefix for ifp would still need a prefix route
1055 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1056 * constants.
1057 *
1058 * 1) we don't purge prefix if address was not permanent.
1059 * prefix is managed by its own lifetime.
1060 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1061 * 3) if there are no addresses, delete prefix.
1062 * 4) if there are still other permanent address(es),
1063 * corresponding prefix is still permanent.
1064 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1065 * don't purge the prefix, assume user space is managing it.
1066 * 6) otherwise, update prefix lifetime to the
1067 * longest valid lifetime among the corresponding
1068 * addresses on the device.
1069 * Note: subsequent RA will update lifetime.
1070 **/
1071static enum cleanup_prefix_rt_t
1072check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1073{
1074 struct inet6_ifaddr *ifa;
1075 struct inet6_dev *idev = ifp->idev;
1076 unsigned long lifetime;
1077 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1078
1079 *expires = jiffies;
1080
1081 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1082 if (ifa == ifp)
1083 continue;
1084 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1085 ifp->prefix_len))
1086 continue;
1087 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1088 return CLEANUP_PREFIX_RT_NOP;
1089
1090 action = CLEANUP_PREFIX_RT_EXPIRE;
1091
1092 spin_lock(&ifa->lock);
1093
1094 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1095 /*
1096 * Note: Because this address is
1097 * not permanent, lifetime <
1098 * LONG_MAX / HZ here.
1099 */
1100 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1101 *expires = ifa->tstamp + lifetime * HZ;
1102 spin_unlock(&ifa->lock);
1103 }
1104
1105 return action;
1106}
1107
1108static void
1109cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1110{
1111 struct rt6_info *rt;
1112
1113 rt = addrconf_get_prefix_route(&ifp->addr,
1114 ifp->prefix_len,
1115 ifp->idev->dev,
1116 0, RTF_GATEWAY | RTF_DEFAULT);
1117 if (rt) {
1118 if (del_rt)
1119 ip6_del_rt(rt);
1120 else {
1121 if (!(rt->rt6i_flags & RTF_EXPIRES))
1122 rt6_set_expires(rt, expires);
1123 ip6_rt_put(rt);
1124 }
1125 }
1126}
1127
1128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129/* This function wants to get referenced ifp and releases it before return */
1130
1131static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1132{
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001133 int state;
Thomas Haller5b84efe2014-01-15 15:36:59 +01001134 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1135 unsigned long expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001137 ASSERT_RTNL();
1138
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001139 spin_lock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001140 state = ifp->state;
Herbert Xue9d3e082010-05-18 15:36:06 -07001141 ifp->state = INET6_IFADDR_STATE_DEAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001142 spin_unlock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001143
1144 if (state == INET6_IFADDR_STATE_DEAD)
1145 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
stephen hemminger5c578aed2010-03-17 20:31:11 +00001147 spin_lock_bh(&addrconf_hash_lock);
1148 hlist_del_init_rcu(&ifp->addr_lst);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001149 spin_unlock_bh(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150
Thomas Haller5b84efe2014-01-15 15:36:59 +01001151 write_lock_bh(&ifp->idev->lock);
David S. Miller5d9efa72013-10-28 20:07:50 -04001152
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 if (ifp->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001154 list_del(&ifp->tmp_list);
1155 if (ifp->ifpub) {
1156 in6_ifa_put(ifp->ifpub);
1157 ifp->ifpub = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 }
stephen hemminger372e6c82010-03-17 20:31:09 +00001159 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
Thomas Haller5b84efe2014-01-15 15:36:59 +01001162 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1163 action = check_cleanup_prefix_route(ifp, &expires);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001164
Thomas Haller5b84efe2014-01-15 15:36:59 +01001165 list_del_init(&ifp->if_list);
1166 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
Thomas Haller5b84efe2014-01-15 15:36:59 +01001168 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001170 addrconf_del_dad_work(ifp);
Andrey Vaginb2238562008-07-08 15:13:31 -07001171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 ipv6_ifa_notify(RTM_DELADDR, ifp);
1173
Cong Wangf88c91d2013-04-14 23:18:43 +08001174 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
Thomas Haller5b84efe2014-01-15 15:36:59 +01001176 if (action != CLEANUP_PREFIX_RT_NOP) {
1177 cleanup_prefix_route(ifp, expires,
1178 action == CLEANUP_PREFIX_RT_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 }
1180
Daniel Walterc3968a82011-04-13 21:10:57 +00001181 /* clean up prefsrc entries */
1182 rt6_remove_prefsrc(ifp);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001183out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 in6_ifa_put(ifp);
1185}
1186
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1188{
1189 struct inet6_dev *idev = ifp->idev;
1190 struct in6_addr addr, *tmpaddr;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001191 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001192 unsigned long regen_advance;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 int tmp_plen;
1194 int ret = 0;
Neil Horman95c385b2007-04-25 17:08:10 -07001195 u32 addr_flags;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001196 unsigned long now = jiffies;
Jiri Bohac76506a92016-10-13 18:52:15 +02001197 long max_desync_factor;
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001198 s32 cnf_temp_preferred_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
Jiri Pirko53bd6742013-12-06 09:45:22 +01001200 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 if (ift) {
1202 spin_lock_bh(&ift->lock);
1203 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1204 spin_unlock_bh(&ift->lock);
1205 tmpaddr = &addr;
1206 } else {
1207 tmpaddr = NULL;
1208 }
1209retry:
1210 in6_dev_hold(idev);
1211 if (idev->cnf.use_tempaddr <= 0) {
Jiri Pirko53bd6742013-12-06 09:45:22 +01001212 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001213 pr_info("%s: use_tempaddr is disabled\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 in6_dev_put(idev);
1215 ret = -1;
1216 goto out;
1217 }
1218 spin_lock_bh(&ifp->lock);
1219 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1220 idev->cnf.use_tempaddr = -1; /*XXX*/
1221 spin_unlock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01001222 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001223 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1224 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 in6_dev_put(idev);
1226 ret = -1;
1227 goto out;
1228 }
1229 in6_ifa_hold(ifp);
1230 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
Jiri Bohac9d6280d2016-10-13 18:50:02 +02001231 ipv6_try_regen_rndid(idev, tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 memcpy(&addr.s6_addr[8], idev->rndid, 8);
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001233 age = (now - ifp->tstamp) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001235 regen_advance = idev->cnf.regen_max_retry *
Ian Morris67ba4152014-08-24 21:53:10 +01001236 idev->cnf.dad_transmits *
1237 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
Jiri Bohac76506a92016-10-13 18:52:15 +02001238
1239 /* recalculate max_desync_factor each time and update
1240 * idev->desync_factor if it's larger
1241 */
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001242 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
Jiri Bohac76506a92016-10-13 18:52:15 +02001243 max_desync_factor = min_t(__u32,
1244 idev->cnf.max_desync_factor,
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001245 cnf_temp_preferred_lft - regen_advance);
Jiri Bohac76506a92016-10-13 18:52:15 +02001246
1247 if (unlikely(idev->desync_factor > max_desync_factor)) {
1248 if (max_desync_factor > 0) {
1249 get_random_bytes(&idev->desync_factor,
1250 sizeof(idev->desync_factor));
1251 idev->desync_factor %= max_desync_factor;
1252 } else {
1253 idev->desync_factor = 0;
1254 }
1255 }
1256
1257 tmp_valid_lft = min_t(__u32,
1258 ifp->valid_lft,
1259 idev->cnf.temp_valid_lft + age);
Jiri Bohac7aa8e632016-10-20 12:29:26 +02001260 tmp_prefered_lft = cnf_temp_preferred_lft + age -
Jiri Bohac76506a92016-10-13 18:52:15 +02001261 idev->desync_factor;
Jiri Bohac76506a92016-10-13 18:52:15 +02001262 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1263 tmp_plen = ifp->prefix_len;
1264 tmp_tstamp = ifp->tstamp;
1265 spin_unlock_bh(&ifp->lock);
1266
Jiri Pirko53bd6742013-12-06 09:45:22 +01001267 write_unlock_bh(&idev->lock);
Neil Horman95c385b2007-04-25 17:08:10 -07001268
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001269 /* A temporary address is created only if this calculated Preferred
1270 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1271 * an implementation must not create a temporary address with a zero
1272 * Preferred Lifetime.
Heiner Kallweitecab6702014-03-12 22:13:19 +01001273 * Use age calculation as in addrconf_verify to avoid unnecessary
1274 * temporary addresses being generated.
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001275 */
Heiner Kallweitecab6702014-03-12 22:13:19 +01001276 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1277 if (tmp_prefered_lft <= regen_advance + age) {
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001278 in6_ifa_put(ifp);
1279 in6_dev_put(idev);
1280 ret = -1;
1281 goto out;
1282 }
1283
Neil Horman95c385b2007-04-25 17:08:10 -07001284 addr_flags = IFA_F_TEMPORARY;
1285 /* set in addrconf_prefix_rcv() */
1286 if (ifp->flags & IFA_F_OPTIMISTIC)
1287 addr_flags |= IFA_F_OPTIMISTIC;
1288
Hannes Frederic Sowa4b08a8f2013-08-16 13:02:27 +02001289 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1290 ipv6_addr_scope(&addr), addr_flags,
1291 tmp_valid_lft, tmp_prefered_lft);
1292 if (IS_ERR(ift)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 in6_ifa_put(ifp);
1294 in6_dev_put(idev);
Joe Perchesf3213832012-05-15 14:11:53 +00001295 pr_info("%s: retry temporary address regeneration\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 tmpaddr = &addr;
Jiri Pirko53bd6742013-12-06 09:45:22 +01001297 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 goto retry;
1299 }
1300
1301 spin_lock_bh(&ift->lock);
1302 ift->ifpub = ifp;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001303 ift->cstamp = now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 ift->tstamp = tmp_tstamp;
1305 spin_unlock_bh(&ift->lock);
1306
David S. Millercf22f9a2012-04-14 21:37:40 -04001307 addrconf_dad_start(ift);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 in6_ifa_put(ift);
1309 in6_dev_put(idev);
1310out:
1311 return ret;
1312}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
1314/*
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001315 * Choose an appropriate source address (RFC3484)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 */
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001317enum {
1318 IPV6_SADDR_RULE_INIT = 0,
1319 IPV6_SADDR_RULE_LOCAL,
1320 IPV6_SADDR_RULE_SCOPE,
1321 IPV6_SADDR_RULE_PREFERRED,
1322#ifdef CONFIG_IPV6_MIP6
1323 IPV6_SADDR_RULE_HOA,
1324#endif
1325 IPV6_SADDR_RULE_OIF,
1326 IPV6_SADDR_RULE_LABEL,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001327 IPV6_SADDR_RULE_PRIVACY,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001328 IPV6_SADDR_RULE_ORCHID,
1329 IPV6_SADDR_RULE_PREFIX,
Erik Kline7fd25612014-10-28 18:11:14 +09001330#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1331 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1332#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001333 IPV6_SADDR_RULE_MAX
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001334};
1335
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001336struct ipv6_saddr_score {
1337 int rule;
1338 int addr_type;
1339 struct inet6_ifaddr *ifa;
1340 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1341 int scopedist;
1342 int matchlen;
1343};
1344
1345struct ipv6_saddr_dst {
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001346 const struct in6_addr *addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001347 int ifindex;
1348 int scope;
1349 int label;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001350 unsigned int prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001351};
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001352
Dave Jonesb6f99a22007-03-22 12:27:49 -07001353static inline int ipv6_saddr_preferred(int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
Ulrich Weber45bb0062010-02-25 23:28:58 +00001355 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001356 return 1;
1357 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358}
1359
Erik Kline7fd25612014-10-28 18:11:14 +09001360static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1361{
1362#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1363 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1364#else
1365 return false;
1366#endif
1367}
1368
Benjamin Thery3de23252008-05-28 14:51:24 +02001369static int ipv6_get_saddr_eval(struct net *net,
1370 struct ipv6_saddr_score *score,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001371 struct ipv6_saddr_dst *dst,
1372 int i)
1373{
1374 int ret;
1375
1376 if (i <= score->rule) {
1377 switch (i) {
1378 case IPV6_SADDR_RULE_SCOPE:
1379 ret = score->scopedist;
1380 break;
1381 case IPV6_SADDR_RULE_PREFIX:
1382 ret = score->matchlen;
1383 break;
1384 default:
1385 ret = !!test_bit(i, score->scorebits);
1386 }
1387 goto out;
1388 }
1389
1390 switch (i) {
1391 case IPV6_SADDR_RULE_INIT:
1392 /* Rule 0: remember if hiscore is not ready yet */
1393 ret = !!score->ifa;
1394 break;
1395 case IPV6_SADDR_RULE_LOCAL:
1396 /* Rule 1: Prefer same address */
1397 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1398 break;
1399 case IPV6_SADDR_RULE_SCOPE:
1400 /* Rule 2: Prefer appropriate scope
1401 *
1402 * ret
1403 * ^
1404 * -1 | d 15
1405 * ---+--+-+---> scope
1406 * |
1407 * | d is scope of the destination.
1408 * B-d | \
1409 * | \ <- smaller scope is better if
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08001410 * B-15 | \ if scope is enough for destination.
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001411 * | ret = B - scope (-1 <= scope >= d <= 15).
1412 * d-C-1 | /
1413 * |/ <- greater is better
1414 * -C / if scope is not enough for destination.
1415 * /| ret = scope - C (-1 <= d < scope <= 15).
1416 *
1417 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1418 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1419 * Assume B = 0 and we get C > 29.
1420 */
1421 ret = __ipv6_addr_src_scope(score->addr_type);
1422 if (ret >= dst->scope)
1423 ret = -ret;
1424 else
1425 ret -= 128; /* 30 is enough */
1426 score->scopedist = ret;
1427 break;
1428 case IPV6_SADDR_RULE_PREFERRED:
Erik Kline7fd25612014-10-28 18:11:14 +09001429 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001430 /* Rule 3: Avoid deprecated and optimistic addresses */
Erik Kline7fd25612014-10-28 18:11:14 +09001431 u8 avoid = IFA_F_DEPRECATED;
1432
1433 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1434 avoid |= IFA_F_OPTIMISTIC;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001435 ret = ipv6_saddr_preferred(score->addr_type) ||
Erik Kline7fd25612014-10-28 18:11:14 +09001436 !(score->ifa->flags & avoid);
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001437 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001438 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001439#ifdef CONFIG_IPV6_MIP6
1440 case IPV6_SADDR_RULE_HOA:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001441 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001442 /* Rule 4: Prefer home address */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001443 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1444 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001445 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001446 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001447#endif
1448 case IPV6_SADDR_RULE_OIF:
1449 /* Rule 5: Prefer outgoing interface */
1450 ret = (!dst->ifindex ||
1451 dst->ifindex == score->ifa->idev->dev->ifindex);
1452 break;
1453 case IPV6_SADDR_RULE_LABEL:
1454 /* Rule 6: Prefer matching label */
Benjamin Thery3de23252008-05-28 14:51:24 +02001455 ret = ipv6_addr_label(net,
1456 &score->ifa->addr, score->addr_type,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001457 score->ifa->idev->dev->ifindex) == dst->label;
1458 break;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001459 case IPV6_SADDR_RULE_PRIVACY:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001460 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001461 /* Rule 7: Prefer public address
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001462 * Note: prefer temporary address if use_tempaddr >= 2
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001463 */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001464 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1465 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1466 score->ifa->idev->cnf.use_tempaddr >= 2;
1467 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001468 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001469 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001470 case IPV6_SADDR_RULE_ORCHID:
1471 /* Rule 8-: Prefer ORCHID vs ORCHID or
1472 * non-ORCHID vs non-ORCHID
1473 */
1474 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1475 ipv6_addr_orchid(dst->addr));
1476 break;
1477 case IPV6_SADDR_RULE_PREFIX:
1478 /* Rule 8: Use longest matching prefix */
YOSHIFUJI Hideaki / 吉藤英明91b4b042012-09-10 18:41:07 +00001479 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1480 if (ret > score->ifa->prefix_len)
1481 ret = score->ifa->prefix_len;
1482 score->matchlen = ret;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001483 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001484#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1485 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1486 /* Optimistic addresses still have lower precedence than other
1487 * preferred addresses.
1488 */
1489 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1490 break;
1491#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001492 default:
1493 ret = 0;
1494 }
1495
1496 if (ret)
1497 __set_bit(i, score->scorebits);
1498 score->rule = i;
1499out:
1500 return ret;
1501}
1502
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001503static int __ipv6_dev_get_saddr(struct net *net,
1504 struct ipv6_saddr_dst *dst,
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001505 struct inet6_dev *idev,
1506 struct ipv6_saddr_score *scores,
1507 int hiscore_idx)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001508{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001509 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 +09001510
1511 read_lock_bh(&idev->lock);
1512 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1513 int i;
1514
1515 /*
1516 * - Tentative Address (RFC2462 section 5.4)
1517 * - A tentative address is not considered
1518 * "assigned to an interface" in the traditional
1519 * sense, unless it is also flagged as optimistic.
1520 * - Candidate Source Address (section 4)
1521 * - In any case, anycast addresses, multicast
1522 * addresses, and the unspecified address MUST
1523 * NOT be included in a candidate set.
1524 */
1525 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1526 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1527 continue;
1528
1529 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1530
1531 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1532 score->addr_type & IPV6_ADDR_MULTICAST)) {
1533 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1534 idev->dev->name);
1535 continue;
1536 }
1537
1538 score->rule = -1;
1539 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1540
1541 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1542 int minihiscore, miniscore;
1543
1544 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1545 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1546
1547 if (minihiscore > miniscore) {
1548 if (i == IPV6_SADDR_RULE_SCOPE &&
1549 score->scopedist > 0) {
1550 /*
1551 * special case:
1552 * each remaining entry
1553 * has too small (not enough)
1554 * scope, because ifa entries
1555 * are sorted by their scope
1556 * values.
1557 */
1558 goto out;
1559 }
1560 break;
1561 } else if (minihiscore < miniscore) {
1562 if (hiscore->ifa)
1563 in6_ifa_put(hiscore->ifa);
1564
1565 in6_ifa_hold(score->ifa);
1566
1567 swap(hiscore, score);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001568 hiscore_idx = 1 - hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001569
1570 /* restore our iterator */
1571 score->ifa = hiscore->ifa;
1572
1573 break;
1574 }
1575 }
1576 }
1577out:
1578 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001579 return hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001580}
1581
David Ahernafbac6012016-06-16 16:24:26 -07001582static int ipv6_get_saddr_master(struct net *net,
1583 const struct net_device *dst_dev,
1584 const struct net_device *master,
1585 struct ipv6_saddr_dst *dst,
1586 struct ipv6_saddr_score *scores,
1587 int hiscore_idx)
1588{
1589 struct inet6_dev *idev;
1590
1591 idev = __in6_dev_get(dst_dev);
1592 if (idev)
1593 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1594 scores, hiscore_idx);
1595
1596 idev = __in6_dev_get(master);
1597 if (idev)
1598 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1599 scores, hiscore_idx);
1600
1601 return hiscore_idx;
1602}
1603
Patrick McHardyb3f644f2012-08-26 19:14:14 +02001604int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001605 const struct in6_addr *daddr, unsigned int prefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001606 struct in6_addr *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001608 struct ipv6_saddr_score scores[2], *hiscore;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001609 struct ipv6_saddr_dst dst;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001610 struct inet6_dev *idev;
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001611 struct net_device *dev;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001612 int dst_type;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001613 bool use_oif_addr = false;
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001614 int hiscore_idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001616 dst_type = __ipv6_addr_type(daddr);
1617 dst.addr = daddr;
1618 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1619 dst.scope = __ipv6_addr_src_scope(dst_type);
Benjamin Thery3de23252008-05-28 14:51:24 +02001620 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001621 dst.prefs = prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001622
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001623 scores[hiscore_idx].rule = -1;
1624 scores[hiscore_idx].ifa = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001626 rcu_read_lock();
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001627
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001628 /* Candidate Source Address (section 4)
1629 * - multicast and link-local destination address,
1630 * the set of candidate source address MUST only
1631 * include addresses assigned to interfaces
1632 * belonging to the same link as the outgoing
1633 * interface.
1634 * (- For site-local destination addresses, the
1635 * set of candidate source addresses MUST only
1636 * include addresses assigned to interfaces
1637 * belonging to the same site as the outgoing
1638 * interface.)
Erik Kline3985e8a2015-07-22 16:38:25 +09001639 * - "It is RECOMMENDED that the candidate source addresses
1640 * be the set of unicast addresses assigned to the
1641 * interface that will be used to send to the destination
1642 * (the 'outgoing' interface)." (RFC 6724)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001643 */
1644 if (dst_dev) {
Erik Kline3985e8a2015-07-22 16:38:25 +09001645 idev = __in6_dev_get(dst_dev);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001646 if ((dst_type & IPV6_ADDR_MULTICAST) ||
Erik Kline3985e8a2015-07-22 16:38:25 +09001647 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1648 (idev && idev->cnf.use_oif_addrs_only)) {
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001649 use_oif_addr = true;
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001650 }
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001651 }
1652
1653 if (use_oif_addr) {
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001654 if (idev)
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001655 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001656 } else {
David Ahernafbac6012016-06-16 16:24:26 -07001657 const struct net_device *master;
1658 int master_idx = 0;
1659
1660 /* if dst_dev exists and is enslaved to an L3 device, then
1661 * prefer addresses from dst_dev and then the master over
1662 * any other enslaved devices in the L3 domain.
1663 */
1664 master = l3mdev_master_dev_rcu(dst_dev);
1665 if (master) {
1666 master_idx = master->ifindex;
1667
1668 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1669 master, &dst,
1670 scores, hiscore_idx);
1671
1672 if (scores[hiscore_idx].ifa)
1673 goto out;
1674 }
1675
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001676 for_each_netdev_rcu(net, dev) {
David Ahernafbac6012016-06-16 16:24:26 -07001677 /* only consider addresses on devices in the
1678 * same L3 domain
1679 */
1680 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1681 continue;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001682 idev = __in6_dev_get(dev);
1683 if (!idev)
1684 continue;
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001685 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001686 }
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001687 }
David Ahernafbac6012016-06-16 16:24:26 -07001688
1689out:
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001690 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001692 hiscore = &scores[hiscore_idx];
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001693 if (!hiscore->ifa)
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001694 return -EADDRNOTAVAIL;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001695
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001696 *saddr = hiscore->ifa->addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001697 in6_ifa_put(hiscore->ifa);
YOSHIFUJI Hideaki072047e2005-11-08 09:38:30 -08001698 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699}
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +09001700EXPORT_SYMBOL(ipv6_dev_get_saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
Amerigo Wang89657792013-06-29 21:30:49 +08001702int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001703 u32 banned_flags)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001704{
1705 struct inet6_ifaddr *ifp;
1706 int err = -EADDRNOTAVAIL;
1707
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01001708 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1709 if (ifp->scope > IFA_LINK)
1710 break;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001711 if (ifp->scope == IFA_LINK &&
1712 !(ifp->flags & banned_flags)) {
1713 *addr = ifp->addr;
1714 err = 0;
1715 break;
1716 }
1717 }
1718 return err;
1719}
1720
Neil Horman95c385b2007-04-25 17:08:10 -07001721int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001722 u32 banned_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723{
1724 struct inet6_dev *idev;
1725 int err = -EADDRNOTAVAIL;
1726
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001727 rcu_read_lock();
Stephen Hemmingere21e8462010-03-20 16:09:01 -07001728 idev = __in6_dev_get(dev);
1729 if (idev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 read_lock_bh(&idev->lock);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001731 err = __ipv6_get_lladdr(idev, addr, banned_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 read_unlock_bh(&idev->lock);
1733 }
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001734 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 return err;
1736}
1737
1738static int ipv6_count_addresses(struct inet6_dev *idev)
1739{
1740 int cnt = 0;
1741 struct inet6_ifaddr *ifp;
1742
1743 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001744 list_for_each_entry(ifp, &idev->addr_list, if_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 cnt++;
1746 read_unlock_bh(&idev->lock);
1747 return cnt;
1748}
1749
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001750int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
Florian Westphal2a7851b2013-05-17 03:56:10 +00001751 const struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752{
Erik Klinec58da4c2015-02-04 20:01:23 +09001753 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1754}
1755EXPORT_SYMBOL(ipv6_chk_addr);
1756
1757int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1758 const struct net_device *dev, int strict,
1759 u32 banned_flags)
1760{
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001761 struct inet6_ifaddr *ifp;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001762 unsigned int hash = inet6_addr_hash(addr);
Erik Klinec58da4c2015-02-04 20:01:23 +09001763 u32 ifp_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764
stephen hemminger5c578aed2010-03-17 20:31:11 +00001765 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001766 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001767 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcanobfeade02008-01-10 22:43:18 -08001768 continue;
Erik Klinec58da4c2015-02-04 20:01:23 +09001769 /* Decouple optimistic from tentative for evaluation here.
1770 * Ban optimistic addresses explicitly, when required.
1771 */
1772 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1773 ? (ifp->flags&~IFA_F_TENTATIVE)
1774 : ifp->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775 if (ipv6_addr_equal(&ifp->addr, addr) &&
Erik Klinec58da4c2015-02-04 20:01:23 +09001776 !(ifp_flags&banned_flags) &&
Ian Morris63159f22015-03-29 14:00:04 +01001777 (!dev || ifp->idev->dev == dev ||
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001778 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1779 rcu_read_unlock_bh();
1780 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 }
1782 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001783
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001784 rcu_read_unlock_bh();
1785 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786}
Erik Klinec58da4c2015-02-04 20:01:23 +09001787EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +09001788
David S. Miller3e81c6d2010-03-20 16:18:00 -07001789static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1790 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791{
Eric Dumazetddbe5032012-07-18 08:11:12 +00001792 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00001793 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
Sasha Levinb67bfe02013-02-27 17:06:00 -08001795 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001796 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano06bfe652008-01-10 22:43:42 -08001797 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001799 if (!dev || ifp->idev->dev == dev)
David S. Miller3e81c6d2010-03-20 16:18:00 -07001800 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 }
1802 }
David S. Miller3e81c6d2010-03-20 16:18:00 -07001803 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804}
1805
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001806/* Compares an address/prefix_len with addresses on device @dev.
1807 * If one is found it returns true.
1808 */
1809bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1810 const unsigned int prefix_len, struct net_device *dev)
1811{
1812 struct inet6_dev *idev;
1813 struct inet6_ifaddr *ifa;
1814 bool ret = false;
1815
1816 rcu_read_lock();
1817 idev = __in6_dev_get(dev);
1818 if (idev) {
1819 read_lock_bh(&idev->lock);
1820 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1821 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1822 if (ret)
1823 break;
1824 }
1825 read_unlock_bh(&idev->lock);
1826 }
1827 rcu_read_unlock();
1828
1829 return ret;
1830}
1831EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1832
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001833int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001834{
1835 struct inet6_dev *idev;
1836 struct inet6_ifaddr *ifa;
1837 int onlink;
1838
1839 onlink = 0;
1840 rcu_read_lock();
1841 idev = __in6_dev_get(dev);
1842 if (idev) {
1843 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001844 list_for_each_entry(ifa, &idev->addr_list, if_list) {
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001845 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1846 ifa->prefix_len);
1847 if (onlink)
1848 break;
1849 }
1850 read_unlock_bh(&idev->lock);
1851 }
1852 rcu_read_unlock();
1853 return onlink;
1854}
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001855EXPORT_SYMBOL(ipv6_chk_prefix);
1856
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001857struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001858 struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859{
David S. Millerb79d1d52010-03-25 21:39:21 -07001860 struct inet6_ifaddr *ifp, *result = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001861 unsigned int hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
stephen hemminger5c578aed2010-03-17 20:31:11 +00001863 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001864 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001865 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001866 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001868 if (!dev || ifp->idev->dev == dev ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
David S. Millerb79d1d52010-03-25 21:39:21 -07001870 result = ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 in6_ifa_hold(ifp);
1872 break;
1873 }
1874 }
1875 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001876 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877
David S. Millerb79d1d52010-03-25 21:39:21 -07001878 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879}
1880
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881/* Gets referenced address, destroys ifaddr */
1882
Brian Haleycc411d02009-09-09 14:41:32 +00001883static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884{
Lubomir Rintel3d171f32016-01-08 13:47:23 +01001885 if (dad_failed)
1886 ifp->flags |= IFA_F_DADFAILED;
1887
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 if (ifp->flags&IFA_F_PERMANENT) {
1889 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001890 addrconf_del_dad_work(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 ifp->flags |= IFA_F_TENTATIVE;
1892 spin_unlock_bh(&ifp->lock);
Herbert Xue2577a02010-03-13 12:23:29 -08001893 if (dad_failed)
1894 ipv6_ifa_notify(0, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 } else if (ifp->flags&IFA_F_TEMPORARY) {
1897 struct inet6_ifaddr *ifpub;
1898 spin_lock_bh(&ifp->lock);
1899 ifpub = ifp->ifpub;
1900 if (ifpub) {
1901 in6_ifa_hold(ifpub);
1902 spin_unlock_bh(&ifp->lock);
1903 ipv6_create_tempaddr(ifpub, ifp);
1904 in6_ifa_put(ifpub);
1905 } else {
1906 spin_unlock_bh(&ifp->lock);
1907 }
1908 ipv6_del_addr(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001909 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 ipv6_del_addr(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001911 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912}
1913
Herbert Xuf2344a12010-05-18 15:55:27 -07001914static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1915{
1916 int err = -ENOENT;
1917
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001918 spin_lock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001919 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1920 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1921 err = 0;
1922 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001923 spin_unlock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001924
1925 return err;
1926}
1927
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09001928void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1929{
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001930 struct inet6_dev *idev = ifp->idev;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001931 struct net *net = dev_net(ifp->idev->dev);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001932
Ursula Braun853dc2e2010-10-24 23:06:43 +00001933 if (addrconf_dad_end(ifp)) {
1934 in6_ifa_put(ifp);
Herbert Xuf2344a12010-05-18 15:55:27 -07001935 return;
Ursula Braun853dc2e2010-10-24 23:06:43 +00001936 }
Herbert Xuf2344a12010-05-18 15:55:27 -07001937
Joe Perchese87cc472012-05-13 21:56:26 +00001938 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1939 ifp->idev->dev->name, &ifp->addr);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001940
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001941 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001942
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001943 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1944 int scope = ifp->scope;
1945 u32 flags = ifp->flags;
1946 struct in6_addr new_addr;
1947 struct inet6_ifaddr *ifp2;
1948 u32 valid_lft, preferred_lft;
1949 int pfxlen = ifp->prefix_len;
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001950 int retries = ifp->stable_privacy_retry + 1;
1951
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001952 if (retries > net->ipv6.sysctl.idgen_retries) {
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001953 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1954 ifp->idev->dev->name);
1955 goto errdad;
1956 }
1957
1958 new_addr = ifp->addr;
1959 if (ipv6_generate_stable_address(&new_addr, retries,
1960 idev))
1961 goto errdad;
1962
1963 valid_lft = ifp->valid_lft;
1964 preferred_lft = ifp->prefered_lft;
1965
1966 spin_unlock_bh(&ifp->lock);
1967
1968 if (idev->cnf.max_addresses &&
1969 ipv6_count_addresses(idev) >=
1970 idev->cnf.max_addresses)
1971 goto lock_errdad;
1972
1973 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1974 ifp->idev->dev->name);
1975
1976 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1977 scope, flags, valid_lft,
1978 preferred_lft);
1979 if (IS_ERR(ifp2))
1980 goto lock_errdad;
1981
1982 spin_lock_bh(&ifp2->lock);
1983 ifp2->stable_privacy_retry = retries;
1984 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1985 spin_unlock_bh(&ifp2->lock);
1986
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001987 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001988 in6_ifa_put(ifp2);
1989lock_errdad:
1990 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001991 }
1992
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001993errdad:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001994 /* transition from _POSTDAD to _ERRDAD */
1995 ifp->state = INET6_IFADDR_STATE_ERRDAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001996 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001997
1998 addrconf_mod_dad_work(ifp, 0);
Wei Yongjun751eb6b2016-09-05 16:06:31 +08001999 in6_ifa_put(ifp);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09002000}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002002/* Join to solicited addr multicast group.
2003 * caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002004void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005{
2006 struct in6_addr maddr;
2007
2008 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2009 return;
2010
2011 addrconf_addr_solict_mult(addr, &maddr);
2012 ipv6_dev_mc_inc(dev, &maddr);
2013}
2014
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002015/* caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002016void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017{
2018 struct in6_addr maddr;
2019
2020 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2021 return;
2022
2023 addrconf_addr_solict_mult(addr, &maddr);
2024 __ipv6_dev_mc_dec(idev, &maddr);
2025}
2026
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002027/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002028static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029{
2030 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002031
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002032 if (ifp->prefix_len >= 127) /* RFC 6164 */
Bjørn Mork2bda8a02011-07-05 23:04:13 +00002033 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2035 if (ipv6_addr_any(&addr))
2036 return;
WANG Cong013b4d92014-09-11 15:35:11 -07002037 __ipv6_dev_ac_inc(ifp->idev, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038}
2039
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002040/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002041static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042{
2043 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002044
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002045 if (ifp->prefix_len >= 127) /* RFC 6164 */
YOSHIFUJI Hideaki32019e62011-07-24 11:44:34 +00002046 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2048 if (ipv6_addr_any(&addr))
2049 return;
2050 __ipv6_dev_ac_dec(ifp->idev, &addr);
2051}
2052
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002053static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2054{
Alexander Aring5241c2d2015-12-14 20:55:22 +01002055 if (dev->addr_len != EUI64_ADDR_LEN)
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002056 return -1;
Alexander Aring5241c2d2015-12-14 20:55:22 +01002057 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
YOSHIFUJI Hideaki / 吉藤英明5e98a362013-01-28 10:44:29 +00002058 eui[0] ^= 2;
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002059 return 0;
2060}
2061
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002062static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2063{
2064 union fwnet_hwaddr *ha;
2065
2066 if (dev->addr_len != FWNET_ALEN)
2067 return -1;
2068
2069 ha = (union fwnet_hwaddr *)dev->dev_addr;
2070
2071 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2072 eui[0] ^= 2;
2073 return 0;
2074}
2075
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002076static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2077{
2078 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2079 if (dev->addr_len != ARCNET_ALEN)
2080 return -1;
2081 memset(eui, 0, 7);
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002082 eui[7] = *(u8 *)dev->dev_addr;
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002083 return 0;
2084}
2085
2086static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2087{
2088 if (dev->addr_len != INFINIBAND_ALEN)
2089 return -1;
2090 memcpy(eui, dev->dev_addr + 12, 8);
2091 eui[0] |= 2;
2092 return 0;
2093}
2094
stephen hemmingerc61393e2010-10-04 20:17:53 +00002095static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002096{
Sascha Hlusiak9af28512009-05-19 12:56:51 +00002097 if (addr == 0)
2098 return -1;
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002099 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2100 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2101 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2102 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2103 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2104 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2105 eui[1] = 0;
2106 eui[2] = 0x5E;
2107 eui[3] = 0xFE;
2108 memcpy(eui + 4, &addr, 4);
2109 return 0;
2110}
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002111
2112static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2113{
2114 if (dev->priv_flags & IFF_ISATAP)
2115 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2116 return -1;
2117}
2118
stephen hemmingeraee80b52011-06-08 10:44:30 +00002119static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2120{
2121 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2122}
2123
Nicolas Dichtele8377352013-08-20 12:16:06 +02002124static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2125{
2126 memcpy(eui, dev->perm_addr, 3);
2127 memcpy(eui + 5, dev->perm_addr + 3, 3);
2128 eui[3] = 0xFF;
2129 eui[4] = 0xFE;
2130 eui[0] ^= 2;
2131 return 0;
2132}
2133
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2135{
2136 switch (dev->type) {
2137 case ARPHRD_ETHER:
2138 case ARPHRD_FDDI:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002139 return addrconf_ifid_eui48(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 case ARPHRD_ARCNET:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002141 return addrconf_ifid_arcnet(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 case ARPHRD_INFINIBAND:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002143 return addrconf_ifid_infiniband(eui, dev);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002144 case ARPHRD_SIT:
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002145 return addrconf_ifid_sit(eui, dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00002146 case ARPHRD_IPGRE:
2147 return addrconf_ifid_gre(eui, dev);
Jukka Rissanene74bccb2013-12-11 17:05:36 +02002148 case ARPHRD_6LOWPAN:
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002149 return addrconf_ifid_eui64(eui, dev);
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002150 case ARPHRD_IEEE1394:
2151 return addrconf_ifid_ieee1394(eui, dev);
Nicolas Dichtele8377352013-08-20 12:16:06 +02002152 case ARPHRD_TUNNEL6:
2153 return addrconf_ifid_ip6tnl(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154 }
2155 return -1;
2156}
2157
2158static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2159{
2160 int err = -1;
2161 struct inet6_ifaddr *ifp;
2162
2163 read_lock_bh(&idev->lock);
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01002164 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2165 if (ifp->scope > IFA_LINK)
2166 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2168 memcpy(eui, ifp->addr.s6_addr+8, 8);
2169 err = 0;
2170 break;
2171 }
2172 }
2173 read_unlock_bh(&idev->lock);
2174 return err;
2175}
2176
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002178static void ipv6_regen_rndid(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180regen:
YOSHIFUJI Hideaki955189e2006-03-20 16:54:09 -08002181 get_random_bytes(idev->rndid, sizeof(idev->rndid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182 idev->rndid[0] &= ~0x02;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183
2184 /*
2185 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2186 * check if generated address is not inappropriate
2187 *
2188 * - Reserved subnet anycast (RFC 2526)
2189 * 11111101 11....11 1xxxxxxx
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002190 * - ISATAP (RFC4214) 6.1
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191 * 00-00-5E-FE-xx-xx-xx-xx
2192 * - value 0
2193 * - XXX: already assigned to an address on the device
2194 */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002195 if (idev->rndid[0] == 0xfd &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2197 (idev->rndid[7]&0x80))
2198 goto regen;
2199 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2200 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2201 goto regen;
2202 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2203 goto regen;
2204 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205}
2206
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002207static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002208{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002210 ipv6_regen_rndid(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212
2213/*
2214 * Add prefix route.
2215 */
2216
2217static void
2218addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07002219 unsigned long expires, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220{
Thomas Graf86872cb2006-08-22 00:01:08 -07002221 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002222 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
Thomas Graf86872cb2006-08-22 00:01:08 -07002223 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2224 .fc_ifindex = dev->ifindex,
2225 .fc_expires = expires,
2226 .fc_dst_len = plen,
2227 .fc_flags = RTF_UP | flags,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002228 .fc_nlinfo.nl_net = dev_net(dev),
Stephen Hemmingerf410a1f2008-08-23 05:16:46 -07002229 .fc_protocol = RTPROT_KERNEL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002230 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00002232 cfg.fc_dst = *pfx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233
2234 /* Prevent useless cloning on PtP SIT.
2235 This thing is done here expecting that the whole
2236 class of non-broadcast devices need not cloning.
2237 */
Amerigo Wang07a93622012-10-29 16:23:10 +00002238#if IS_ENABLED(CONFIG_IPV6_SIT)
Thomas Graf86872cb2006-08-22 00:01:08 -07002239 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2240 cfg.fc_flags |= RTF_NONEXTHOP;
Joerg Roedel0be669b2006-10-10 14:49:53 -07002241#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242
Thomas Graf86872cb2006-08-22 00:01:08 -07002243 ip6_route_add(&cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244}
2245
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002246
2247static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2248 int plen,
2249 const struct net_device *dev,
2250 u32 flags, u32 noflags)
2251{
2252 struct fib6_node *fn;
2253 struct rt6_info *rt = NULL;
2254 struct fib6_table *table;
David Ahernca254492015-10-12 11:47:10 -07002255 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002256
David Ahernca254492015-10-12 11:47:10 -07002257 table = fib6_get_table(dev_net(dev), tb_id);
Ian Morris63159f22015-03-29 14:00:04 +01002258 if (!table)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002259 return NULL;
2260
Li RongQing5744dd92012-09-11 21:59:01 +00002261 read_lock_bh(&table->tb6_lock);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002262 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2263 if (!fn)
2264 goto out;
Martin KaFai Lau1f56a012015-04-28 13:03:03 -07002265
2266 noflags |= RTF_CACHE;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002267 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
David S. Millerd1918542011-12-28 20:19:20 -05002268 if (rt->dst.dev->ifindex != dev->ifindex)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002269 continue;
2270 if ((rt->rt6i_flags & flags) != flags)
2271 continue;
Romain Kuntz85da53b2013-01-09 15:02:26 +01002272 if ((rt->rt6i_flags & noflags) != 0)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002273 continue;
2274 dst_hold(&rt->dst);
2275 break;
2276 }
2277out:
Li RongQing5744dd92012-09-11 21:59:01 +00002278 read_unlock_bh(&table->tb6_lock);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002279 return rt;
2280}
2281
2282
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283/* Create "default" multicast route to the interface */
2284
2285static void addrconf_add_mroute(struct net_device *dev)
2286{
Thomas Graf86872cb2006-08-22 00:01:08 -07002287 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002288 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002289 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2290 .fc_ifindex = dev->ifindex,
2291 .fc_dst_len = 8,
2292 .fc_flags = RTF_UP,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002293 .fc_nlinfo.nl_net = dev_net(dev),
Thomas Graf86872cb2006-08-22 00:01:08 -07002294 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295
Thomas Graf86872cb2006-08-22 00:01:08 -07002296 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2297
2298 ip6_route_add(&cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299}
2300
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2302{
2303 struct inet6_dev *idev;
2304
2305 ASSERT_RTNL();
2306
Stephen Hemmingere21e8462010-03-20 16:09:01 -07002307 idev = ipv6_find_idev(dev);
2308 if (!idev)
Brian Haley64e724f2010-07-20 10:34:30 +00002309 return ERR_PTR(-ENOBUFS);
2310
2311 if (idev->cnf.disable_ipv6)
2312 return ERR_PTR(-EACCES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313
2314 /* Add default multicast route */
David Ahernba46ee42016-06-13 13:44:18 -07002315 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
Li Wei4af04ab2011-12-06 21:23:45 +00002316 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 return idev;
2319}
2320
Jiri Pirko53bd6742013-12-06 09:45:22 +01002321static void manage_tempaddrs(struct inet6_dev *idev,
2322 struct inet6_ifaddr *ifp,
2323 __u32 valid_lft, __u32 prefered_lft,
2324 bool create, unsigned long now)
2325{
2326 u32 flags;
2327 struct inet6_ifaddr *ift;
2328
2329 read_lock_bh(&idev->lock);
2330 /* update all temporary addresses in the list */
2331 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2332 int age, max_valid, max_prefered;
2333
2334 if (ifp != ift->ifpub)
2335 continue;
2336
2337 /* RFC 4941 section 3.3:
2338 * If a received option will extend the lifetime of a public
2339 * address, the lifetimes of temporary addresses should
2340 * be extended, subject to the overall constraint that no
2341 * temporary addresses should ever remain "valid" or "preferred"
2342 * for a time longer than (TEMP_VALID_LIFETIME) or
2343 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2344 */
2345 age = (now - ift->cstamp) / HZ;
2346 max_valid = idev->cnf.temp_valid_lft - age;
2347 if (max_valid < 0)
2348 max_valid = 0;
2349
2350 max_prefered = idev->cnf.temp_prefered_lft -
Jiri Bohac76506a92016-10-13 18:52:15 +02002351 idev->desync_factor - age;
Jiri Pirko53bd6742013-12-06 09:45:22 +01002352 if (max_prefered < 0)
2353 max_prefered = 0;
2354
2355 if (valid_lft > max_valid)
2356 valid_lft = max_valid;
2357
2358 if (prefered_lft > max_prefered)
2359 prefered_lft = max_prefered;
2360
2361 spin_lock(&ift->lock);
2362 flags = ift->flags;
2363 ift->valid_lft = valid_lft;
2364 ift->prefered_lft = prefered_lft;
2365 ift->tstamp = now;
2366 if (prefered_lft > 0)
2367 ift->flags &= ~IFA_F_DEPRECATED;
2368
2369 spin_unlock(&ift->lock);
2370 if (!(flags&IFA_F_TENTATIVE))
2371 ipv6_ifa_notify(0, ift);
2372 }
2373
2374 if ((create || list_empty(&idev->tempaddr_list)) &&
2375 idev->cnf.use_tempaddr > 0) {
2376 /* When a new public address is created as described
2377 * in [ADDRCONF], also create a new temporary address.
2378 * Also create a temporary address if it's enabled but
2379 * no temporary address currently exists.
2380 */
2381 read_unlock_bh(&idev->lock);
2382 ipv6_create_tempaddr(ifp, NULL);
2383 } else {
2384 read_unlock_bh(&idev->lock);
2385 }
2386}
2387
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002388static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2389{
2390 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2391 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2392}
2393
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002394int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2395 const struct prefix_info *pinfo,
2396 struct inet6_dev *in6_dev,
2397 const struct in6_addr *addr, int addr_type,
2398 u32 addr_flags, bool sllao, bool tokenized,
2399 __u32 valid_lft, u32 prefered_lft)
Alexander Aring4f672232016-06-15 21:20:22 +02002400{
2401 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2402 int create = 0, update_lft = 0;
2403
2404 if (!ifp && valid_lft) {
2405 int max_addresses = in6_dev->cnf.max_addresses;
2406
2407#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2408 if (in6_dev->cnf.optimistic_dad &&
2409 !net->ipv6.devconf_all->forwarding && sllao)
2410 addr_flags |= IFA_F_OPTIMISTIC;
2411#endif
2412
2413 /* Do not allow to create too much of autoconfigured
2414 * addresses; this would be too easy way to crash kernel.
2415 */
2416 if (!max_addresses ||
2417 ipv6_count_addresses(in6_dev) < max_addresses)
2418 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2419 pinfo->prefix_len,
2420 addr_type&IPV6_ADDR_SCOPE_MASK,
2421 addr_flags, valid_lft,
2422 prefered_lft);
2423
2424 if (IS_ERR_OR_NULL(ifp))
2425 return -1;
2426
2427 update_lft = 0;
2428 create = 1;
2429 spin_lock_bh(&ifp->lock);
2430 ifp->flags |= IFA_F_MANAGETEMPADDR;
2431 ifp->cstamp = jiffies;
2432 ifp->tokenized = tokenized;
2433 spin_unlock_bh(&ifp->lock);
2434 addrconf_dad_start(ifp);
2435 }
2436
2437 if (ifp) {
2438 u32 flags;
2439 unsigned long now;
2440 u32 stored_lft;
2441
2442 /* update lifetime (RFC2462 5.5.3 e) */
2443 spin_lock_bh(&ifp->lock);
2444 now = jiffies;
2445 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2446 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2447 else
2448 stored_lft = 0;
2449 if (!update_lft && !create && stored_lft) {
2450 const u32 minimum_lft = min_t(u32,
2451 stored_lft, MIN_VALID_LIFETIME);
2452 valid_lft = max(valid_lft, minimum_lft);
2453
2454 /* RFC4862 Section 5.5.3e:
2455 * "Note that the preferred lifetime of the
2456 * corresponding address is always reset to
2457 * the Preferred Lifetime in the received
2458 * Prefix Information option, regardless of
2459 * whether the valid lifetime is also reset or
2460 * ignored."
2461 *
2462 * So we should always update prefered_lft here.
2463 */
2464 update_lft = 1;
2465 }
2466
2467 if (update_lft) {
2468 ifp->valid_lft = valid_lft;
2469 ifp->prefered_lft = prefered_lft;
2470 ifp->tstamp = now;
2471 flags = ifp->flags;
2472 ifp->flags &= ~IFA_F_DEPRECATED;
2473 spin_unlock_bh(&ifp->lock);
2474
2475 if (!(flags&IFA_F_TENTATIVE))
2476 ipv6_ifa_notify(0, ifp);
2477 } else
2478 spin_unlock_bh(&ifp->lock);
2479
2480 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2481 create, now);
2482
2483 in6_ifa_put(ifp);
2484 addrconf_verify();
2485 }
2486
2487 return 0;
2488}
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002489EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
Alexander Aring4f672232016-06-15 21:20:22 +02002490
Neil Hormane6bff992012-01-04 10:49:15 +00002491void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492{
2493 struct prefix_info *pinfo;
2494 __u32 valid_lft;
2495 __u32 prefered_lft;
Alexander Aring4f672232016-06-15 21:20:22 +02002496 int addr_type, err;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002497 u32 addr_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 struct inet6_dev *in6_dev;
Brian Haley56d417b2009-06-01 03:07:33 -07002499 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500
2501 pinfo = (struct prefix_info *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002502
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 if (len < sizeof(struct prefix_info)) {
dingtianhongba3542e2013-08-17 10:27:04 +08002504 ADBG("addrconf: prefix option too short\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002505 return;
2506 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002507
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508 /*
2509 * Validation checks ([ADDRCONF], page 19)
2510 */
2511
2512 addr_type = ipv6_addr_type(&pinfo->prefix);
2513
2514 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2515 return;
2516
2517 valid_lft = ntohl(pinfo->valid);
2518 prefered_lft = ntohl(pinfo->prefered);
2519
2520 if (prefered_lft > valid_lft) {
Joe Perchese87cc472012-05-13 21:56:26 +00002521 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 return;
2523 }
2524
2525 in6_dev = in6_dev_get(dev);
2526
Ian Morris63159f22015-03-29 14:00:04 +01002527 if (!in6_dev) {
Joe Perchese87cc472012-05-13 21:56:26 +00002528 net_dbg_ratelimited("addrconf: device %s not configured\n",
2529 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 return;
2531 }
2532
2533 /*
2534 * Two things going on here:
2535 * 1) Add routes for on-link prefixes
2536 * 2) Configure prefixes with the auto flag set
2537 */
2538
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002539 if (pinfo->onlink) {
2540 struct rt6_info *rt;
2541 unsigned long rt_expires;
2542
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002543 /* Avoid arithmetic overflow. Really, we could
2544 * save rt_expires in seconds, likely valid_lft,
2545 * but it would require division in fib gc, that it
2546 * not good.
2547 */
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002548 if (HZ > USER_HZ)
2549 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2550 else
2551 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
YOSHIFUJI Hideaki3dd4bc62005-12-19 14:02:45 -08002552
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002553 if (addrconf_finite_timeout(rt_expires))
2554 rt_expires *= HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002556 rt = addrconf_get_prefix_route(&pinfo->prefix,
2557 pinfo->prefix_len,
2558 dev,
2559 RTF_ADDRCONF | RTF_PREFIX_RT,
2560 RTF_GATEWAY | RTF_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002562 if (rt) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002563 /* Autoconf prefix route */
2564 if (valid_lft == 0) {
2565 ip6_del_rt(rt);
2566 rt = NULL;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002567 } else if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002568 /* not infinity */
Gao feng1716a962012-04-06 00:13:10 +00002569 rt6_set_expires(rt, jiffies + rt_expires);
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002570 } else {
Gao feng1716a962012-04-06 00:13:10 +00002571 rt6_clean_expires(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002572 }
2573 } else if (valid_lft) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002574 clock_t expires = 0;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002575 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2576 if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002577 /* not infinity */
2578 flags |= RTF_EXPIRES;
2579 expires = jiffies_to_clock_t(rt_expires);
2580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002582 dev, expires, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00002584 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 }
2586
2587 /* Try to figure out our local address for this prefix */
2588
2589 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002590 struct in6_addr addr;
Alexander Aringf997c552016-06-15 21:20:23 +02002591 bool tokenized = false, dev_addr_generated = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592
2593 if (pinfo->prefix_len == 64) {
2594 memcpy(&addr, &pinfo->prefix, 8);
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002595
2596 if (!ipv6_addr_any(&in6_dev->token)) {
2597 read_lock_bh(&in6_dev->lock);
2598 memcpy(addr.s6_addr + 8,
2599 in6_dev->token.s6_addr + 8, 8);
2600 read_unlock_bh(&in6_dev->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00002601 tokenized = true;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002602 } else if (is_addr_mode_generate_stable(in6_dev) &&
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01002603 !ipv6_generate_stable_address(&addr, 0,
2604 in6_dev)) {
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002605 addr_flags |= IFA_F_STABLE_PRIVACY;
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01002606 goto ok;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002607 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2608 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
Alexander Aring4f672232016-06-15 21:20:22 +02002609 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002610 } else {
2611 dev_addr_generated = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612 }
2613 goto ok;
2614 }
Joe Perchese87cc472012-05-13 21:56:26 +00002615 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2616 pinfo->prefix_len);
Alexander Aring4f672232016-06-15 21:20:22 +02002617 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618
2619ok:
Alexander Aring4f672232016-06-15 21:20:22 +02002620 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2621 &addr, addr_type,
2622 addr_flags, sllao,
2623 tokenized, valid_lft,
2624 prefered_lft);
2625 if (err)
2626 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002627
2628 /* Ignore error case here because previous prefix add addr was
2629 * successful which will be notified.
2630 */
2631 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2632 addr_type, addr_flags, sllao,
2633 tokenized, valid_lft,
2634 prefered_lft,
2635 dev_addr_generated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 }
2637 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
Alexander Aring4f672232016-06-15 21:20:22 +02002638put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639 in6_dev_put(in6_dev);
2640}
2641
2642/*
2643 * Set destination address.
2644 * Special case for SIT interfaces where we create a new "virtual"
2645 * device.
2646 */
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002647int addrconf_set_dstaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648{
2649 struct in6_ifreq ireq;
2650 struct net_device *dev;
2651 int err = -EINVAL;
2652
2653 rtnl_lock();
2654
2655 err = -EFAULT;
2656 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2657 goto err_exit;
2658
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002659 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660
2661 err = -ENODEV;
Ian Morris63159f22015-03-29 14:00:04 +01002662 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663 goto err_exit;
2664
Amerigo Wang07a93622012-10-29 16:23:10 +00002665#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 if (dev->type == ARPHRD_SIT) {
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002667 const struct net_device_ops *ops = dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668 struct ifreq ifr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002669 struct ip_tunnel_parm p;
2670
2671 err = -EADDRNOTAVAIL;
2672 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2673 goto err_exit;
2674
2675 memset(&p, 0, sizeof(p));
2676 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2677 p.iph.saddr = 0;
2678 p.iph.version = 4;
2679 p.iph.ihl = 5;
2680 p.iph.protocol = IPPROTO_IPV6;
2681 p.iph.ttl = 64;
Stephen Hemmingerd20b3102008-01-21 00:48:43 -08002682 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002684 if (ops->ndo_do_ioctl) {
2685 mm_segment_t oldfs = get_fs();
2686
2687 set_fs(KERNEL_DS);
2688 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2689 set_fs(oldfs);
2690 } else
2691 err = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692
2693 if (err == 0) {
2694 err = -ENOBUFS;
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002695 dev = __dev_get_by_name(net, p.name);
2696 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 goto err_exit;
2698 err = dev_open(dev);
2699 }
2700 }
Joerg Roedel0be669b2006-10-10 14:49:53 -07002701#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702
2703err_exit:
2704 rtnl_unlock();
2705 return err;
2706}
2707
Madhu Challa93a714d2015-02-25 09:58:35 -08002708static int ipv6_mc_config(struct sock *sk, bool join,
2709 const struct in6_addr *addr, int ifindex)
2710{
2711 int ret;
2712
2713 ASSERT_RTNL();
2714
2715 lock_sock(sk);
2716 if (join)
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002717 ret = ipv6_sock_mc_join(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002718 else
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002719 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002720 release_sock(sk);
2721
2722 return ret;
2723}
2724
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725/*
2726 * Manual configuration of address on an interface
2727 */
Jiri Pirko479840f2013-12-06 09:45:21 +01002728static int inet6_addr_add(struct net *net, int ifindex,
2729 const struct in6_addr *pfx,
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002730 const struct in6_addr *peer_pfx,
Jiri Pirko479840f2013-12-06 09:45:21 +01002731 unsigned int plen, __u32 ifa_flags,
2732 __u32 prefered_lft, __u32 valid_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733{
2734 struct inet6_ifaddr *ifp;
2735 struct inet6_dev *idev;
2736 struct net_device *dev;
Madhu Challa93a714d2015-02-25 09:58:35 -08002737 unsigned long timeout;
2738 clock_t expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002739 int scope;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002740 u32 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741
2742 ASSERT_RTNL();
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002743
Thomas Graf24ef0da2008-05-28 16:54:22 +02002744 if (plen > 128)
2745 return -EINVAL;
2746
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002747 /* check the lifetime */
2748 if (!valid_lft || prefered_lft > valid_lft)
2749 return -EINVAL;
2750
Jiri Pirko53bd6742013-12-06 09:45:22 +01002751 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2752 return -EINVAL;
2753
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002754 dev = __dev_get_by_index(net, ifindex);
2755 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756 return -ENODEV;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002757
Brian Haley64e724f2010-07-20 10:34:30 +00002758 idev = addrconf_add_dev(dev);
2759 if (IS_ERR(idev))
2760 return PTR_ERR(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761
Madhu Challa93a714d2015-02-25 09:58:35 -08002762 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2763 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2764 true, pfx, ifindex);
2765
2766 if (ret < 0)
2767 return ret;
2768 }
2769
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770 scope = ipv6_addr_scope(pfx);
2771
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002772 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2773 if (addrconf_finite_timeout(timeout)) {
2774 expires = jiffies_to_clock_t(timeout * HZ);
2775 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002776 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002777 } else {
2778 expires = 0;
2779 flags = 0;
2780 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002781 }
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002782
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002783 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2784 if (addrconf_finite_timeout(timeout)) {
2785 if (timeout == 0)
2786 ifa_flags |= IFA_F_DEPRECATED;
2787 prefered_lft = timeout;
2788 }
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002789
Jiri Benc8a226b22013-08-01 10:41:28 +02002790 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2791 valid_lft, prefered_lft);
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09002792
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 if (!IS_ERR(ifp)) {
Thomas Haller761aac72014-01-15 15:36:58 +01002794 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2795 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2796 expires, flags);
2797 }
2798
Neil Horman95c385b2007-04-25 17:08:10 -07002799 /*
2800 * Note that section 3.1 of RFC 4429 indicates
2801 * that the Optimistic flag should not be set for
2802 * manually configured addresses
2803 */
David S. Millercf22f9a2012-04-14 21:37:40 -04002804 addrconf_dad_start(ifp);
Jiri Pirko53bd6742013-12-06 09:45:22 +01002805 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2806 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2807 true, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002809 addrconf_verify_rtnl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002810 return 0;
Madhu Challa93a714d2015-02-25 09:58:35 -08002811 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2812 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2813 false, pfx, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002814 }
2815
2816 return PTR_ERR(ifp);
2817}
2818
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002819static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2820 const struct in6_addr *pfx, unsigned int plen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821{
2822 struct inet6_ifaddr *ifp;
2823 struct inet6_dev *idev;
2824 struct net_device *dev;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002825
Thomas Graf24ef0da2008-05-28 16:54:22 +02002826 if (plen > 128)
2827 return -EINVAL;
2828
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002829 dev = __dev_get_by_index(net, ifindex);
2830 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002831 return -ENODEV;
2832
Ian Morrise5d08d72014-11-23 21:28:43 +00002833 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01002834 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835 return -ENXIO;
2836
2837 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00002838 list_for_each_entry(ifp, &idev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839 if (ifp->prefix_len == plen &&
2840 ipv6_addr_equal(pfx, &ifp->addr)) {
2841 in6_ifa_hold(ifp);
2842 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002843
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002844 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2845 (ifa_flags & IFA_F_MANAGETEMPADDR))
2846 manage_tempaddrs(idev, ifp, 0, 0, false,
2847 jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848 ipv6_del_addr(ifp);
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002849 addrconf_verify_rtnl();
Madhu Challa93a714d2015-02-25 09:58:35 -08002850 if (ipv6_addr_is_multicast(pfx)) {
2851 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2852 false, pfx, dev->ifindex);
2853 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854 return 0;
2855 }
2856 }
2857 read_unlock_bh(&idev->lock);
2858 return -EADDRNOTAVAIL;
2859}
2860
2861
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002862int addrconf_add_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863{
2864 struct in6_ifreq ireq;
2865 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002866
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002867 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868 return -EPERM;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002869
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2871 return -EFAULT;
2872
2873 rtnl_lock();
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002874 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002875 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2876 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 rtnl_unlock();
2878 return err;
2879}
2880
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002881int addrconf_del_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882{
2883 struct in6_ifreq ireq;
2884 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002885
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002886 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887 return -EPERM;
2888
2889 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2890 return -EFAULT;
2891
2892 rtnl_lock();
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002893 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002894 ireq.ifr6_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895 rtnl_unlock();
2896 return err;
2897}
2898
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002899static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2900 int plen, int scope)
2901{
2902 struct inet6_ifaddr *ifp;
2903
Jiri Benc8a226b22013-08-01 10:41:28 +02002904 ifp = ipv6_add_addr(idev, addr, NULL, plen,
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01002905 scope, IFA_F_PERMANENT,
2906 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002907 if (!IS_ERR(ifp)) {
2908 spin_lock_bh(&ifp->lock);
2909 ifp->flags &= ~IFA_F_TENTATIVE;
2910 spin_unlock_bh(&ifp->lock);
Paolo Abeni764d3be2016-11-22 16:57:40 +01002911 rt_genid_bump_ipv6(dev_net(idev->dev));
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002912 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2913 in6_ifa_put(ifp);
2914 }
2915}
2916
Amerigo Wang07a93622012-10-29 16:23:10 +00002917#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918static void sit_add_v4_addrs(struct inet6_dev *idev)
2919{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002920 struct in6_addr addr;
2921 struct net_device *dev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002922 struct net *net = dev_net(idev->dev);
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002923 int scope, plen;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002924 u32 pflags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925
2926 ASSERT_RTNL();
2927
2928 memset(&addr, 0, sizeof(struct in6_addr));
2929 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2930
2931 if (idev->dev->flags&IFF_POINTOPOINT) {
2932 addr.s6_addr32[0] = htonl(0xfe800000);
2933 scope = IFA_LINK;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002934 plen = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935 } else {
2936 scope = IPV6_ADDR_COMPATv4;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002937 plen = 96;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002938 pflags |= RTF_NONEXTHOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939 }
2940
2941 if (addr.s6_addr32[3]) {
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002942 add_addr(idev, &addr, plen, scope);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002943 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002944 return;
2945 }
2946
Benjamin Thery6fda7352008-03-05 10:47:47 -08002947 for_each_netdev(net, dev) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002948 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949 if (in_dev && (dev->flags & IFF_UP)) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002950 struct in_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951
2952 int flag = scope;
2953
2954 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
2956 addr.s6_addr32[3] = ifa->ifa_local;
2957
2958 if (ifa->ifa_scope == RT_SCOPE_LINK)
2959 continue;
2960 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2961 if (idev->dev->flags&IFF_POINTOPOINT)
2962 continue;
2963 flag |= IFA_HOST;
2964 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002966 add_addr(idev, &addr, plen, flag);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002967 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2968 pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002969 }
2970 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972}
Joerg Roedel0be669b2006-10-10 14:49:53 -07002973#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974
2975static void init_loopback(struct net_device *dev)
2976{
2977 struct inet6_dev *idev;
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05302978 struct net_device *sp_dev;
2979 struct inet6_ifaddr *sp_ifa;
2980 struct rt6_info *sp_rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981
2982 /* ::1 */
2983
2984 ASSERT_RTNL();
2985
Ian Morrise5d08d72014-11-23 21:28:43 +00002986 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01002987 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00002988 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002989 return;
2990 }
2991
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002992 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05302993
2994 /* Add routes to other interface's IPv6 addresses */
2995 for_each_netdev(dev_net(dev), sp_dev) {
2996 if (!strcmp(sp_dev->name, dev->name))
2997 continue;
2998
2999 idev = __in6_dev_get(sp_dev);
3000 if (!idev)
3001 continue;
3002
3003 read_lock_bh(&idev->lock);
3004 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3005
3006 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3007 continue;
3008
Gao feng33d99112014-01-24 16:29:11 +08003009 if (sp_ifa->rt) {
3010 /* This dst has been added to garbage list when
3011 * lo device down, release this obsolete dst and
3012 * reallocate a new router for ifa.
3013 */
Nicolas Dichtela2204452016-10-12 10:10:40 +02003014 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
Gao feng33d99112014-01-24 16:29:11 +08003015 ip6_rt_put(sp_ifa->rt);
3016 sp_ifa->rt = NULL;
3017 } else {
3018 continue;
3019 }
3020 }
Gao fenga881ae12013-06-16 11:14:30 +08003021
François-Xavier Le Bail57ec0af2013-12-02 11:28:49 +01003022 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05303023
3024 /* Failure cases are ignored */
Gao feng534c8772013-06-02 22:16:21 +00003025 if (!IS_ERR(sp_rt)) {
3026 sp_ifa->rt = sp_rt;
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05303027 ip6_ins_rt(sp_rt);
Gao feng534c8772013-06-02 22:16:21 +00003028 }
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05303029 }
3030 read_unlock_bh(&idev->lock);
3031 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003032}
3033
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003034void addrconf_add_linklocal(struct inet6_dev *idev,
3035 const struct in6_addr *addr, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003036{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003037 struct inet6_ifaddr *ifp;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003038 u32 addr_flags = flags | IFA_F_PERMANENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003039
Neil Horman95c385b2007-04-25 17:08:10 -07003040#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3041 if (idev->cnf.optimistic_dad &&
David Miller702beb82008-07-20 18:17:02 -07003042 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
Neil Horman95c385b2007-04-25 17:08:10 -07003043 addr_flags |= IFA_F_OPTIMISTIC;
3044#endif
3045
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01003046 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048 if (!IS_ERR(ifp)) {
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09003049 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
David S. Millercf22f9a2012-04-14 21:37:40 -04003050 addrconf_dad_start(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003051 in6_ifa_put(ifp);
3052 }
3053}
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003054EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003056static bool ipv6_reserved_interfaceid(struct in6_addr address)
3057{
3058 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3059 return true;
3060
3061 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3062 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3063 return true;
3064
3065 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3066 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3067 return true;
3068
3069 return false;
3070}
3071
3072static int ipv6_generate_stable_address(struct in6_addr *address,
3073 u8 dad_count,
3074 const struct inet6_dev *idev)
3075{
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003076 static DEFINE_SPINLOCK(lock);
3077 static __u32 digest[SHA_DIGEST_WORDS];
3078 static __u32 workspace[SHA_WORKSPACE_WORDS];
3079
3080 static union {
3081 char __data[SHA_MESSAGE_BYTES];
3082 struct {
3083 struct in6_addr secret;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003084 __be32 prefix[2];
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003085 unsigned char hwaddr[MAX_ADDR_LEN];
3086 u8 dad_count;
3087 } __packed;
3088 } data;
3089
3090 struct in6_addr secret;
3091 struct in6_addr temp;
3092 struct net *net = dev_net(idev->dev);
3093
3094 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3095
3096 if (idev->cnf.stable_secret.initialized)
3097 secret = idev->cnf.stable_secret.secret;
3098 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3099 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3100 else
3101 return -1;
3102
3103retry:
3104 spin_lock_bh(&lock);
3105
3106 sha_init(digest);
3107 memset(&data, 0, sizeof(data));
3108 memset(workspace, 0, sizeof(workspace));
3109 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003110 data.prefix[0] = address->s6_addr32[0];
3111 data.prefix[1] = address->s6_addr32[1];
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003112 data.secret = secret;
3113 data.dad_count = dad_count;
3114
3115 sha_transform(digest, data.__data, workspace);
3116
3117 temp = *address;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003118 temp.s6_addr32[2] = (__force __be32)digest[0];
3119 temp.s6_addr32[3] = (__force __be32)digest[1];
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003120
3121 spin_unlock_bh(&lock);
3122
3123 if (ipv6_reserved_interfaceid(temp)) {
3124 dad_count++;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01003125 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003126 return -1;
3127 goto retry;
3128 }
3129
3130 *address = temp;
3131 return 0;
3132}
3133
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003134static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3135{
3136 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3137
3138 if (s->initialized)
3139 return;
3140 s = &idev->cnf.stable_secret;
3141 get_random_bytes(&s->secret, sizeof(s->secret));
3142 s->initialized = true;
3143}
3144
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003145static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3146{
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003147 struct in6_addr addr;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003148
David Ahernca254492015-10-12 11:47:10 -07003149 /* no link local addresses on L3 master devices */
3150 if (netif_is_l3_master(idev->dev))
3151 return;
3152
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003153 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3154
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003155 switch (idev->addr_gen_mode) {
3156 case IN6_ADDR_GEN_MODE_RANDOM:
3157 ipv6_gen_mode_random_init(idev);
3158 /* fallthrough */
3159 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003160 if (!ipv6_generate_stable_address(&addr, 0, idev))
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003161 addrconf_add_linklocal(idev, &addr,
3162 IFA_F_STABLE_PRIVACY);
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01003163 else if (prefix_route)
3164 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003165 break;
3166 case IN6_ADDR_GEN_MODE_EUI64:
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003167 /* addrconf_add_linklocal also adds a prefix_route and we
3168 * only need to care about prefix routes if ipv6_generate_eui64
3169 * couldn't generate one.
3170 */
3171 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003172 addrconf_add_linklocal(idev, &addr, 0);
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003173 else if (prefix_route)
3174 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003175 break;
3176 case IN6_ADDR_GEN_MODE_NONE:
3177 default:
3178 /* will not add any link local address */
3179 break;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003180 }
3181}
3182
Linus Torvalds1da177e2005-04-16 15:20:36 -07003183static void addrconf_dev_config(struct net_device *dev)
3184{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003185 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003186
3187 ASSERT_RTNL();
3188
Herbert Xu74235a22007-06-14 13:02:55 -07003189 if ((dev->type != ARPHRD_ETHER) &&
3190 (dev->type != ARPHRD_FDDI) &&
Herbert Xu74235a22007-06-14 13:02:55 -07003191 (dev->type != ARPHRD_ARCNET) &&
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00003192 (dev->type != ARPHRD_INFINIBAND) &&
Nicolas Dichtele8377352013-08-20 12:16:06 +02003193 (dev->type != ARPHRD_IEEE1394) &&
Jukka Rissanene74bccb2013-12-11 17:05:36 +02003194 (dev->type != ARPHRD_TUNNEL6) &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003195 (dev->type != ARPHRD_6LOWPAN) &&
3196 (dev->type != ARPHRD_NONE)) {
Herbert Xu74235a22007-06-14 13:02:55 -07003197 /* Alas, we support only Ethernet autoconfiguration. */
3198 return;
3199 }
3200
Linus Torvalds1da177e2005-04-16 15:20:36 -07003201 idev = addrconf_add_dev(dev);
Brian Haley64e724f2010-07-20 10:34:30 +00003202 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003203 return;
3204
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003205 /* this device type has no EUI support */
3206 if (dev->type == ARPHRD_NONE &&
3207 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3208 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3209
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003210 addrconf_addr_gen(idev, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003211}
3212
Amerigo Wang07a93622012-10-29 16:23:10 +00003213#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003214static void addrconf_sit_config(struct net_device *dev)
3215{
3216 struct inet6_dev *idev;
3217
3218 ASSERT_RTNL();
3219
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003220 /*
3221 * Configure the tunnel with one of our IPv4
3222 * addresses... we should configure all of
Linus Torvalds1da177e2005-04-16 15:20:36 -07003223 * our v4 addrs in the tunnel
3224 */
3225
Ian Morrise5d08d72014-11-23 21:28:43 +00003226 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003227 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003228 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003229 return;
3230 }
3231
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003232 if (dev->priv_flags & IFF_ISATAP) {
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003233 addrconf_addr_gen(idev, false);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003234 return;
3235 }
3236
Linus Torvalds1da177e2005-04-16 15:20:36 -07003237 sit_add_v4_addrs(idev);
3238
Nicolas Dichtel62b54dd2012-10-01 23:19:14 +00003239 if (dev->flags&IFF_POINTOPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003241}
Joerg Roedel0be669b2006-10-10 14:49:53 -07003242#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003243
Amerigo Wang07a93622012-10-29 16:23:10 +00003244#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003245static void addrconf_gre_config(struct net_device *dev)
3246{
3247 struct inet6_dev *idev;
stephen hemmingeraee80b52011-06-08 10:44:30 +00003248
stephen hemmingeraee80b52011-06-08 10:44:30 +00003249 ASSERT_RTNL();
3250
Ian Morrise5d08d72014-11-23 21:28:43 +00003251 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003252 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003253 pr_debug("%s: add_dev failed\n", __func__);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003254 return;
3255 }
3256
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003257 addrconf_addr_gen(idev, true);
Hannes Frederic Sowad9e4ce62015-10-08 18:19:39 +02003258 if (dev->flags & IFF_POINTOPOINT)
3259 addrconf_add_mroute(dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003260}
3261#endif
3262
David Ahernf1705ec2016-02-24 09:25:37 -08003263static int fixup_permanent_addr(struct inet6_dev *idev,
3264 struct inet6_ifaddr *ifp)
3265{
3266 if (!ifp->rt) {
3267 struct rt6_info *rt;
3268
3269 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3270 if (unlikely(IS_ERR(rt)))
3271 return PTR_ERR(rt);
3272
3273 ifp->rt = rt;
3274 }
3275
3276 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3277 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3278 idev->dev, 0, 0);
3279 }
3280
3281 addrconf_dad_start(ifp);
3282
3283 return 0;
3284}
3285
3286static void addrconf_permanent_addr(struct net_device *dev)
3287{
3288 struct inet6_ifaddr *ifp, *tmp;
3289 struct inet6_dev *idev;
3290
3291 idev = __in6_dev_get(dev);
3292 if (!idev)
3293 return;
3294
3295 write_lock_bh(&idev->lock);
3296
3297 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3298 if ((ifp->flags & IFA_F_PERMANENT) &&
3299 fixup_permanent_addr(idev, ifp) < 0) {
3300 write_unlock_bh(&idev->lock);
3301 ipv6_del_addr(ifp);
3302 write_lock_bh(&idev->lock);
3303
3304 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3305 idev->dev->name, &ifp->addr);
3306 }
3307 }
3308
3309 write_unlock_bh(&idev->lock);
3310}
3311
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003312static int addrconf_notify(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +00003313 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003314{
Jiri Pirko351638e2013-05-28 01:30:21 +00003315 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
David Ahern4f7f34e2016-04-07 11:10:41 -07003316 struct netdev_notifier_changeupper_info *info;
Eric Dumazet748e2d92012-08-22 21:50:59 +00003317 struct inet6_dev *idev = __in6_dev_get(dev);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003318 int run_pending = 0;
Herbert Xub217d612007-07-30 17:04:52 -07003319 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003320
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003321 switch (event) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003322 case NETDEV_REGISTER:
Herbert Xu74235a22007-06-14 13:02:55 -07003323 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003324 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -07003325 if (IS_ERR(idev))
3326 return notifier_from_errno(PTR_ERR(idev));
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003327 }
3328 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003329
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003330 case NETDEV_CHANGEMTU:
3331 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3332 if (dev->mtu < IPV6_MIN_MTU) {
3333 addrconf_ifdown(dev, 1);
3334 break;
3335 }
3336
3337 if (idev) {
3338 rt6_mtu_change(dev, dev->mtu);
3339 idev->cnf.mtu6 = dev->mtu;
3340 break;
3341 }
3342
3343 /* allocate new idev */
3344 idev = ipv6_add_dev(dev);
3345 if (IS_ERR(idev))
3346 break;
3347
3348 /* device is still not ready */
3349 if (!(idev->if_flags & IF_READY))
3350 break;
3351
3352 run_pending = 1;
3353
3354 /* fall through */
3355
Linus Torvalds1da177e2005-04-16 15:20:36 -07003356 case NETDEV_UP:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003357 case NETDEV_CHANGE:
Jay Vosburghc2edacf2007-07-09 10:42:47 -07003358 if (dev->flags & IFF_SLAVE)
3359 break;
3360
WANG Cong3ce62a82014-09-11 15:07:16 -07003361 if (idev && idev->cnf.disable_ipv6)
3362 break;
3363
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003364 if (event == NETDEV_UP) {
David Ahern38bd10c2016-04-21 20:56:12 -07003365 /* restore routes for permanent addresses */
3366 addrconf_permanent_addr(dev);
3367
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -07003368 if (!addrconf_qdisc_ok(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003369 /* device is not ready yet. */
Joe Perchesf3213832012-05-15 14:11:53 +00003370 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003371 dev->name);
3372 break;
3373 }
Kristian Slavov99081042006-02-08 16:10:53 -08003374
Evgeniy Polyakovd31c7b82007-11-30 23:36:08 +11003375 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3376 idev = ipv6_add_dev(dev);
3377
WANG Conga317a2f2014-07-25 15:25:09 -07003378 if (!IS_ERR_OR_NULL(idev)) {
Kristian Slavov99081042006-02-08 16:10:53 -08003379 idev->if_flags |= IF_READY;
Benjamin Therye3ec6cf2008-11-05 01:43:57 -08003380 run_pending = 1;
3381 }
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003382 } else if (event == NETDEV_CHANGE) {
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -07003383 if (!addrconf_qdisc_ok(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003384 /* device is still not ready. */
3385 break;
3386 }
3387
3388 if (idev) {
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003389 if (idev->if_flags & IF_READY)
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003390 /* device is already configured. */
3391 break;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003392 idev->if_flags |= IF_READY;
3393 }
3394
Joe Perchesf3213832012-05-15 14:11:53 +00003395 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3396 dev->name);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003397
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003398 run_pending = 1;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003399 }
3400
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003401 switch (dev->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +00003402#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003403 case ARPHRD_SIT:
3404 addrconf_sit_config(dev);
3405 break;
Joerg Roedel0be669b2006-10-10 14:49:53 -07003406#endif
Amerigo Wang07a93622012-10-29 16:23:10 +00003407#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003408 case ARPHRD_IPGRE:
3409 addrconf_gre_config(dev);
3410 break;
3411#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003412 case ARPHRD_LOOPBACK:
3413 init_loopback(dev);
3414 break;
3415
3416 default:
3417 addrconf_dev_config(dev);
3418 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003419 }
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003420
WANG Conga317a2f2014-07-25 15:25:09 -07003421 if (!IS_ERR_OR_NULL(idev)) {
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003422 if (run_pending)
3423 addrconf_dad_run(idev);
3424
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003425 /*
3426 * If the MTU changed during the interface down,
3427 * when the interface up, the changed MTU must be
3428 * reflected in the idev as well as routers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003429 */
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003430 if (idev->cnf.mtu6 != dev->mtu &&
3431 dev->mtu >= IPV6_MIN_MTU) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003432 rt6_mtu_change(dev, dev->mtu);
3433 idev->cnf.mtu6 = dev->mtu;
3434 }
3435 idev->tstamp = jiffies;
3436 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003437
3438 /*
3439 * If the changed mtu during down is lower than
3440 * IPV6_MIN_MTU stop IPv6 on this interface.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003441 */
3442 if (dev->mtu < IPV6_MIN_MTU)
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003443 addrconf_ifdown(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003444 }
3445 break;
3446
Linus Torvalds1da177e2005-04-16 15:20:36 -07003447 case NETDEV_DOWN:
3448 case NETDEV_UNREGISTER:
3449 /*
3450 * Remove all addresses from this interface.
3451 */
3452 addrconf_ifdown(dev, event != NETDEV_DOWN);
3453 break;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003454
Linus Torvalds1da177e2005-04-16 15:20:36 -07003455 case NETDEV_CHANGENAME:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003456 if (idev) {
Stephen Hemminger5632c512007-04-28 21:16:39 -07003457 snmp6_unregister_dev(idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003458 addrconf_sysctl_unregister(idev);
WANG Conga317a2f2014-07-25 15:25:09 -07003459 err = addrconf_sysctl_register(idev);
Herbert Xub217d612007-07-30 17:04:52 -07003460 if (err)
3461 return notifier_from_errno(err);
WANG Conga317a2f2014-07-25 15:25:09 -07003462 err = snmp6_register_dev(idev);
3463 if (err) {
3464 addrconf_sysctl_unregister(idev);
3465 return notifier_from_errno(err);
3466 }
Stephen Hemminger5632c512007-04-28 21:16:39 -07003467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003468 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003469
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003470 case NETDEV_PRE_TYPE_CHANGE:
3471 case NETDEV_POST_TYPE_CHANGE:
Andrew Lunn3ef09522015-12-03 21:12:32 +01003472 if (idev)
3473 addrconf_type_change(dev, event);
Moni Shoua75c78502009-09-15 02:37:40 -07003474 break;
David Ahern4f7f34e2016-04-07 11:10:41 -07003475
3476 case NETDEV_CHANGEUPPER:
3477 info = ptr;
3478
3479 /* flush all routes if dev is linked to or unlinked from
3480 * an L3 master device (e.g., VRF)
3481 */
3482 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3483 addrconf_ifdown(dev, 0);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003485
3486 return NOTIFY_OK;
3487}
3488
3489/*
3490 * addrconf module should be notified of a device going up
3491 */
3492static struct notifier_block ipv6_dev_notf = {
3493 .notifier_call = addrconf_notify,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003494};
3495
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003496static void addrconf_type_change(struct net_device *dev, unsigned long event)
Moni Shoua75c78502009-09-15 02:37:40 -07003497{
3498 struct inet6_dev *idev;
3499 ASSERT_RTNL();
3500
3501 idev = __in6_dev_get(dev);
3502
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003503 if (event == NETDEV_POST_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003504 ipv6_mc_remap(idev);
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003505 else if (event == NETDEV_PRE_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003506 ipv6_mc_unmap(idev);
3507}
3508
David Ahern70af9212016-04-08 12:01:21 -07003509static bool addr_is_local(const struct in6_addr *addr)
3510{
3511 return ipv6_addr_type(addr) &
3512 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3513}
3514
Linus Torvalds1da177e2005-04-16 15:20:36 -07003515static int addrconf_ifdown(struct net_device *dev, int how)
3516{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09003517 struct net *net = dev_net(dev);
stephen hemminger502a2ff2010-03-17 20:31:13 +00003518 struct inet6_dev *idev;
David Ahernf1705ec2016-02-24 09:25:37 -08003519 struct inet6_ifaddr *ifa, *tmp;
3520 struct list_head del_list;
3521 int _keep_addr;
3522 bool keep_addr;
David S. Miller73a8bd72011-01-23 23:27:15 -08003523 int state, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003524
3525 ASSERT_RTNL();
3526
David S. Miller73a8bd72011-01-23 23:27:15 -08003527 rt6_ifdown(net, dev);
3528 neigh_ifdown(&nd_tbl, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003529
3530 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003531 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003532 return -ENODEV;
3533
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003534 /*
3535 * Step 1: remove reference to ipv6 device from parent device.
3536 * Do not dev_put!
Linus Torvalds1da177e2005-04-16 15:20:36 -07003537 */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003538 if (how) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003539 idev->dead = 1;
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07003540
3541 /* protected by rtnl_lock */
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003542 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003543
3544 /* Step 1.5: remove snmp6 entry */
3545 snmp6_unregister_dev(idev);
3546
3547 }
3548
David Ahernf1705ec2016-02-24 09:25:37 -08003549 /* aggregate the system setting and interface setting */
3550 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3551 if (!_keep_addr)
3552 _keep_addr = idev->cnf.keep_addr_on_down;
3553
3554 /* combine the user config with event to determine if permanent
3555 * addresses are to be removed from address hash table
3556 */
Mike Manningbc561632016-08-12 12:02:38 +01003557 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003558
David S. Miller73a8bd72011-01-23 23:27:15 -08003559 /* Step 2: clear hash table */
3560 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3561 struct hlist_head *h = &inet6_addr_lst[i];
David S. Miller73a8bd72011-01-23 23:27:15 -08003562
3563 spin_lock_bh(&addrconf_hash_lock);
Ian Morris67ba4152014-08-24 21:53:10 +01003564restart:
Sasha Levinb67bfe02013-02-27 17:06:00 -08003565 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
David S. Miller73a8bd72011-01-23 23:27:15 -08003566 if (ifa->idev == idev) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003567 addrconf_del_dad_work(ifa);
David Ahernf1705ec2016-02-24 09:25:37 -08003568 /* combined flag + permanent flag decide if
3569 * address is retained on a down event
3570 */
3571 if (!keep_addr ||
David Ahern70af9212016-04-08 12:01:21 -07003572 !(ifa->flags & IFA_F_PERMANENT) ||
3573 addr_is_local(&ifa->addr)) {
David Ahernf1705ec2016-02-24 09:25:37 -08003574 hlist_del_init_rcu(&ifa->addr_lst);
3575 goto restart;
3576 }
David S. Miller73a8bd72011-01-23 23:27:15 -08003577 }
3578 }
3579 spin_unlock_bh(&addrconf_hash_lock);
3580 }
3581
Linus Torvalds1da177e2005-04-16 15:20:36 -07003582 write_lock_bh(&idev->lock);
3583
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003584 addrconf_del_rs_timer(idev);
3585
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003586 /* Step 2: clear flags for stateless addrconf */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003587 if (!how)
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003588 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003590 /* Step 3: clear tempaddr list */
stephen hemminger372e6c82010-03-17 20:31:09 +00003591 while (!list_empty(&idev->tempaddr_list)) {
3592 ifa = list_first_entry(&idev->tempaddr_list,
3593 struct inet6_ifaddr, tmp_list);
3594 list_del(&ifa->tmp_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003595 write_unlock_bh(&idev->lock);
3596 spin_lock_bh(&ifa->lock);
3597
3598 if (ifa->ifpub) {
3599 in6_ifa_put(ifa->ifpub);
3600 ifa->ifpub = NULL;
3601 }
3602 spin_unlock_bh(&ifa->lock);
3603 in6_ifa_put(ifa);
3604 write_lock_bh(&idev->lock);
3605 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003606
David Ahernf1705ec2016-02-24 09:25:37 -08003607 /* re-combine the user config with event to determine if permanent
3608 * addresses are to be removed from the interface list
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
3612 INIT_LIST_HEAD(&del_list);
3613 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
David Ahern38bd10c2016-04-21 20:56:12 -07003614 struct rt6_info *rt = NULL;
3615
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003616 addrconf_del_dad_work(ifa);
stephen hemminger84e8b802010-03-02 13:32:46 +00003617
David S. Miller73a8bd72011-01-23 23:27:15 -08003618 write_unlock_bh(&idev->lock);
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003619 spin_lock_bh(&ifa->lock);
David Ahernf1705ec2016-02-24 09:25:37 -08003620
David Ahern70af9212016-04-08 12:01:21 -07003621 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3622 !addr_is_local(&ifa->addr)) {
David Ahernf1705ec2016-02-24 09:25:37 -08003623 /* set state to skip the notifier below */
3624 state = INET6_IFADDR_STATE_DEAD;
3625 ifa->state = 0;
3626 if (!(ifa->flags & IFA_F_NODAD))
3627 ifa->flags |= IFA_F_TENTATIVE;
David Ahern38bd10c2016-04-21 20:56:12 -07003628
3629 rt = ifa->rt;
3630 ifa->rt = NULL;
David Ahernf1705ec2016-02-24 09:25:37 -08003631 } else {
3632 state = ifa->state;
3633 ifa->state = INET6_IFADDR_STATE_DEAD;
3634
Wei Yongjunc8822192016-07-28 16:19:03 +00003635 list_move(&ifa->if_list, &del_list);
David Ahernf1705ec2016-02-24 09:25:37 -08003636 }
3637
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003638 spin_unlock_bh(&ifa->lock);
stephen hemminger84e8b802010-03-02 13:32:46 +00003639
David Ahern38bd10c2016-04-21 20:56:12 -07003640 if (rt)
3641 ip6_del_rt(rt);
3642
David S. Miller73a8bd72011-01-23 23:27:15 -08003643 if (state != INET6_IFADDR_STATE_DEAD) {
3644 __ipv6_ifa_notify(RTM_DELADDR, ifa);
Cong Wangf88c91d2013-04-14 23:18:43 +08003645 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
Mike Manningea06f712016-07-22 18:32:11 +01003646 } else {
3647 if (idev->cnf.forwarding)
3648 addrconf_leave_anycast(ifa);
3649 addrconf_leave_solict(ifa->idev, &ifa->addr);
stephen hemminger27bdb2a2010-04-12 05:41:32 +00003650 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003651
David S. Miller73a8bd72011-01-23 23:27:15 -08003652 write_lock_bh(&idev->lock);
3653 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003654
Linus Torvalds1da177e2005-04-16 15:20:36 -07003655 write_unlock_bh(&idev->lock);
3656
David Ahernf1705ec2016-02-24 09:25:37 -08003657 /* now clean up addresses to be removed */
3658 while (!list_empty(&del_list)) {
3659 ifa = list_first_entry(&del_list,
3660 struct inet6_ifaddr, if_list);
3661 list_del(&ifa->if_list);
3662
3663 in6_ifa_put(ifa);
3664 }
3665
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003666 /* Step 5: Discard anycast and multicast list */
3667 if (how) {
3668 ipv6_ac_destroy_dev(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003669 ipv6_mc_destroy_dev(idev);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003670 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003671 ipv6_mc_down(idev);
Sabrina Dubroca381f4dc2014-09-10 23:23:02 +02003672 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003673
Linus Torvalds1da177e2005-04-16 15:20:36 -07003674 idev->tstamp = jiffies;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003675
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003676 /* Last: Shot the device (if unregistered) */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003677 if (how) {
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003678 addrconf_sysctl_unregister(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003679 neigh_parms_release(&nd_tbl, idev->nd_parms);
3680 neigh_ifdown(&nd_tbl, dev);
3681 in6_dev_put(idev);
3682 }
3683 return 0;
3684}
3685
3686static void addrconf_rs_timer(unsigned long data)
3687{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003688 struct inet6_dev *idev = (struct inet6_dev *)data;
Cong Wangcaf92bc2013-08-31 13:44:32 +08003689 struct net_device *dev = idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003690 struct in6_addr lladdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003691
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003692 write_lock(&idev->lock);
stephen hemminger5b2a1952010-03-02 13:32:45 +00003693 if (idev->dead || !(idev->if_flags & IF_READY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003694 goto out;
3695
Shmulik Ladkani9ba2add2012-12-02 01:44:53 +00003696 if (!ipv6_accept_ra(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003697 goto out;
stephen hemminger5b2a1952010-03-02 13:32:45 +00003698
3699 /* Announcement received after solicitation was sent */
3700 if (idev->if_flags & IF_RA_RCVD)
3701 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003702
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003703 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
Cong Wangcaf92bc2013-08-31 13:44:32 +08003704 write_unlock(&idev->lock);
3705 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3706 ndisc_send_rs(dev, &lladdr,
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003707 &in6addr_linklocal_allrouters);
3708 else
Cong Wangcaf92bc2013-08-31 13:44:32 +08003709 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710
Cong Wangcaf92bc2013-08-31 13:44:32 +08003711 write_lock(&idev->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003712 idev->rs_interval = rfc3315_s14_backoff_update(
3713 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003714 /* The wait after the last probe can be shorter */
3715 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3716 idev->cnf.rtr_solicits) ?
3717 idev->cnf.rtr_solicit_delay :
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003718 idev->rs_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003719 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003720 /*
3721 * Note: we do not support deprecated "all on-link"
3722 * assumption any longer.
3723 */
Joe Perches91df42b2012-05-15 14:11:54 +00003724 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003725 }
3726
3727out:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003728 write_unlock(&idev->lock);
Cong Wangcaf92bc2013-08-31 13:44:32 +08003729put:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003730 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003731}
3732
3733/*
3734 * Duplicate Address Detection
3735 */
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003736static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3737{
3738 unsigned long rand_num;
3739 struct inet6_dev *idev = ifp->idev;
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003740 u64 nonce;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003741
Neil Horman95c385b2007-04-25 17:08:10 -07003742 if (ifp->flags & IFA_F_OPTIMISTIC)
3743 rand_num = 0;
3744 else
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003745 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
Neil Horman95c385b2007-04-25 17:08:10 -07003746
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003747 nonce = 0;
3748 if (idev->cnf.enhanced_dad ||
3749 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3750 do
3751 get_random_bytes(&nonce, 6);
3752 while (nonce == 0);
3753 }
3754 ifp->dad_nonce = nonce;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003755 ifp->dad_probes = idev->cnf.dad_transmits;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003756 addrconf_mod_dad_work(ifp, rand_num);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003757}
3758
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003759static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003760{
3761 struct inet6_dev *idev = ifp->idev;
3762 struct net_device *dev = idev->dev;
Paolo Abeni764d3be2016-11-22 16:57:40 +01003763 bool bump_id, notify = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003764
3765 addrconf_join_solict(dev, &ifp->addr);
3766
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003767 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003768
3769 read_lock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003770 spin_lock(&ifp->lock);
Herbert Xue9d3e082010-05-18 15:36:06 -07003771 if (ifp->state == INET6_IFADDR_STATE_DEAD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003772 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003773
3774 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09003775 idev->cnf.accept_dad < 1 ||
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07003776 !(ifp->flags&IFA_F_TENTATIVE) ||
3777 ifp->flags & IFA_F_NODAD) {
Paolo Abeni764d3be2016-11-22 16:57:40 +01003778 bump_id = ifp->flags & IFA_F_TENTATIVE;
Brian Haleycc411d02009-09-09 14:41:32 +00003779 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003780 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003781 read_unlock_bh(&idev->lock);
3782
Paolo Abeni764d3be2016-11-22 16:57:40 +01003783 addrconf_dad_completed(ifp, bump_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003784 return;
3785 }
3786
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003787 if (!(idev->if_flags & IF_READY)) {
stephen hemminger21809fa2010-02-08 19:48:52 +00003788 spin_unlock(&ifp->lock);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003789 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003790 /*
Masatake YAMATO590a9882009-06-09 10:41:12 +09003791 * If the device is not ready:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003792 * - keep it tentative if it is a permanent address.
3793 * - otherwise, kill it.
3794 */
3795 in6_ifa_hold(ifp);
Brian Haleycc411d02009-09-09 14:41:32 +00003796 addrconf_dad_stop(ifp, 0);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003797 return;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003798 }
Neil Horman95c385b2007-04-25 17:08:10 -07003799
3800 /*
3801 * Optimistic nodes can start receiving
3802 * Frames right away
3803 */
Erik Kline7fd25612014-10-28 18:11:14 +09003804 if (ifp->flags & IFA_F_OPTIMISTIC) {
Neil Horman95c385b2007-04-25 17:08:10 -07003805 ip6_ins_rt(ifp->rt);
Erik Kline7fd25612014-10-28 18:11:14 +09003806 if (ipv6_use_optimistic_addr(idev)) {
3807 /* Because optimistic nodes can use this address,
3808 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3809 */
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003810 notify = true;
Erik Kline7fd25612014-10-28 18:11:14 +09003811 }
3812 }
Neil Horman95c385b2007-04-25 17:08:10 -07003813
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003814 addrconf_dad_kick(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003815out:
Herbert Xu622ccdf2010-05-18 15:56:06 -07003816 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003817 read_unlock_bh(&idev->lock);
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003818 if (notify)
3819 ipv6_ifa_notify(RTM_NEWADDR, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003820}
3821
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003822static void addrconf_dad_start(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003823{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003824 bool begin_dad = false;
3825
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003826 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003827 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3828 ifp->state = INET6_IFADDR_STATE_PREDAD;
3829 begin_dad = true;
3830 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003831 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003832
3833 if (begin_dad)
3834 addrconf_mod_dad_work(ifp, 0);
3835}
3836
3837static void addrconf_dad_work(struct work_struct *w)
3838{
3839 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3840 struct inet6_ifaddr,
3841 dad_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003842 struct inet6_dev *idev = ifp->idev;
Paolo Abeni764d3be2016-11-22 16:57:40 +01003843 bool bump_id, disable_ipv6 = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003844 struct in6_addr mcaddr;
3845
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003846 enum {
3847 DAD_PROCESS,
3848 DAD_BEGIN,
3849 DAD_ABORT,
3850 } action = DAD_PROCESS;
3851
3852 rtnl_lock();
3853
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003854 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003855 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3856 action = DAD_BEGIN;
3857 ifp->state = INET6_IFADDR_STATE_DAD;
3858 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3859 action = DAD_ABORT;
3860 ifp->state = INET6_IFADDR_STATE_POSTDAD;
Mike Manning85b51b12016-08-18 14:39:40 +01003861
3862 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3863 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3864 struct in6_addr addr;
3865
3866 addr.s6_addr32[0] = htonl(0xfe800000);
3867 addr.s6_addr32[1] = 0;
3868
3869 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3870 ipv6_addr_equal(&ifp->addr, &addr)) {
3871 /* DAD failed for link-local based on MAC */
3872 idev->cnf.disable_ipv6 = 1;
3873
3874 pr_info("%s: IPv6 being disabled!\n",
3875 ifp->idev->dev->name);
3876 disable_ipv6 = true;
3877 }
3878 }
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003879 }
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 (action == DAD_BEGIN) {
3883 addrconf_dad_begin(ifp);
3884 goto out;
3885 } else if (action == DAD_ABORT) {
Wei Yongjun751eb6b2016-09-05 16:06:31 +08003886 in6_ifa_hold(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003887 addrconf_dad_stop(ifp, 1);
Mike Manning85b51b12016-08-18 14:39:40 +01003888 if (disable_ipv6)
3889 addrconf_ifdown(idev->dev, 0);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003890 goto out;
3891 }
3892
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003893 if (!ifp->dad_probes && addrconf_dad_end(ifp))
Herbert Xuf2344a12010-05-18 15:55:27 -07003894 goto out;
3895
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003896 write_lock_bh(&idev->lock);
stephen hemminger122e4512010-03-02 13:32:44 +00003897 if (idev->dead || !(idev->if_flags & IF_READY)) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003898 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003899 goto out;
3900 }
stephen hemminger21809fa2010-02-08 19:48:52 +00003901
3902 spin_lock(&ifp->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003903 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3904 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003905 write_unlock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003906 goto out;
3907 }
3908
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003909 if (ifp->dad_probes == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003910 /*
3911 * DAD was successful
3912 */
3913
Paolo Abeni764d3be2016-11-22 16:57:40 +01003914 bump_id = ifp->flags & IFA_F_TENTATIVE;
Brian Haleycc411d02009-09-09 14:41:32 +00003915 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003916 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003917 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003918
Paolo Abeni764d3be2016-11-22 16:57:40 +01003919 addrconf_dad_completed(ifp, bump_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003920
3921 goto out;
3922 }
3923
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003924 ifp->dad_probes--;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003925 addrconf_mod_dad_work(ifp,
3926 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
stephen hemminger21809fa2010-02-08 19:48:52 +00003927 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003928 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003929
3930 /* send a neighbour solicitation for our addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003931 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
Erik Nordmarkadc176c2016-12-02 14:00:08 -08003932 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3933 ifp->dad_nonce);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003934out:
3935 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003936 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003937}
3938
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003939/* ifp->idev must be at least read locked */
3940static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3941{
3942 struct inet6_ifaddr *ifpiter;
3943 struct inet6_dev *idev = ifp->idev;
3944
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01003945 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3946 if (ifpiter->scope > IFA_LINK)
3947 break;
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003948 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3949 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3950 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3951 IFA_F_PERMANENT)
3952 return false;
3953 }
3954 return true;
3955}
3956
Paolo Abeni764d3be2016-11-22 16:57:40 +01003957static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003958{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003959 struct net_device *dev = ifp->idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003960 struct in6_addr lladdr;
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003961 bool send_rs, send_mld;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003962
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003963 addrconf_del_dad_work(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003964
3965 /*
3966 * Configure the address for reception. Now it is valid.
3967 */
3968
3969 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3970
Tore Anderson026359b2011-08-28 23:47:33 +00003971 /* If added prefix is link local and we are prepared to process
3972 router advertisements, start sending router solicitations.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003973 */
3974
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003975 read_lock_bh(&ifp->idev->lock);
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003976 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003977 send_rs = send_mld &&
3978 ipv6_accept_ra(ifp->idev) &&
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003979 ifp->idev->cnf.rtr_solicits != 0 &&
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003980 (dev->flags&IFF_LOOPBACK) == 0;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003981 read_unlock_bh(&ifp->idev->lock);
3982
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003983 /* While dad is in progress mld report's source address is in6_addrany.
3984 * Resend with proper ll now.
3985 */
3986 if (send_mld)
3987 ipv6_mc_dad_complete(ifp->idev);
3988
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003989 if (send_rs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003990 /*
3991 * If a host as already performed a random delay
3992 * [...] as part of DAD [...] there is no need
3993 * to delay again before sending the first RS
3994 */
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003995 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003996 return;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003997 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003998
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003999 write_lock_bh(&ifp->idev->lock);
4000 spin_lock(&ifp->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004001 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4002 ifp->idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004003 ifp->idev->rs_probes = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004004 ifp->idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004005 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02004006 spin_unlock(&ifp->lock);
4007 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004008 }
Paolo Abeni764d3be2016-11-22 16:57:40 +01004009
4010 if (bump_id)
4011 rt_genid_bump_ipv6(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004012}
4013
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004014static void addrconf_dad_run(struct inet6_dev *idev)
4015{
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004016 struct inet6_ifaddr *ifp;
4017
4018 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00004019 list_for_each_entry(ifp, &idev->addr_list, if_list) {
stephen hemminger21809fa2010-02-08 19:48:52 +00004020 spin_lock(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07004021 if (ifp->flags & IFA_F_TENTATIVE &&
4022 ifp->state == INET6_IFADDR_STATE_DAD)
4023 addrconf_dad_kick(ifp);
stephen hemminger21809fa2010-02-08 19:48:52 +00004024 spin_unlock(&ifp->lock);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004025 }
4026 read_unlock_bh(&idev->lock);
4027}
4028
Linus Torvalds1da177e2005-04-16 15:20:36 -07004029#ifdef CONFIG_PROC_FS
4030struct if6_iter_state {
Daniel Lezcano3c400902008-01-10 22:42:49 -08004031 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004032 int bucket;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004033 int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004034};
4035
Mihai Maruseac1d578302012-01-03 23:31:35 +00004036static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004037{
4038 struct inet6_ifaddr *ifa = NULL;
4039 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004040 struct net *net = seq_file_net(seq);
Mihai Maruseac1d578302012-01-03 23:31:35 +00004041 int p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004042
Mihai Maruseac1d578302012-01-03 23:31:35 +00004043 /* initial bucket if pos is 0 */
4044 if (pos == 0) {
4045 state->bucket = 0;
4046 state->offset = 0;
4047 }
4048
4049 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08004050 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
Mihai Maruseac1d578302012-01-03 23:31:35 +00004051 addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004052 if (!net_eq(dev_net(ifa->idev->dev), net))
4053 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004054 /* sync with offset */
4055 if (p < state->offset) {
4056 p++;
4057 continue;
4058 }
4059 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004060 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004061 }
4062
4063 /* prepare for next bucket */
4064 state->offset = 0;
4065 p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004066 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004067 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004068}
4069
stephen hemmingerc2e21292010-03-17 20:31:10 +00004070static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4071 struct inet6_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004072{
4073 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004074 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004075
Sasha Levinb67bfe02013-02-27 17:06:00 -08004076 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004077 if (!net_eq(dev_net(ifa->idev->dev), net))
4078 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004079 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004080 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004081 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004082
4083 while (++state->bucket < IN6_ADDR_HSIZE) {
Mihai Maruseac1d578302012-01-03 23:31:35 +00004084 state->offset = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -08004085 hlist_for_each_entry_rcu_bh(ifa,
stephen hemmingerc2e21292010-03-17 20:31:10 +00004086 &inet6_addr_lst[state->bucket], addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004087 if (!net_eq(dev_net(ifa->idev->dev), net))
4088 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004089 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004090 return ifa;
Daniel Lezcano3c400902008-01-10 22:42:49 -08004091 }
4092 }
4093
stephen hemmingerc2e21292010-03-17 20:31:10 +00004094 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004095}
4096
Linus Torvalds1da177e2005-04-16 15:20:36 -07004097static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004098 __acquires(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004099{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004100 rcu_read_lock_bh();
Mihai Maruseac1d578302012-01-03 23:31:35 +00004101 return if6_get_first(seq, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004102}
4103
4104static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4105{
4106 struct inet6_ifaddr *ifa;
4107
4108 ifa = if6_get_next(seq, v);
4109 ++*pos;
4110 return ifa;
4111}
4112
4113static void if6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004114 __releases(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004115{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004116 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004117}
4118
4119static int if6_seq_show(struct seq_file *seq, void *v)
4120{
4121 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
Jiri Pirko971a3512013-12-10 13:56:29 +01004122 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
Harvey Harrisonb0711952008-10-28 16:05:40 -07004123 &ifp->addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004124 ifp->idev->dev->ifindex,
4125 ifp->prefix_len,
4126 ifp->scope,
Jiri Pirko971a3512013-12-10 13:56:29 +01004127 (u8) ifp->flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004128 ifp->idev->dev->name);
4129 return 0;
4130}
4131
Philippe De Muyter56b3d972007-07-10 23:07:31 -07004132static const struct seq_operations if6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004133 .start = if6_seq_start,
4134 .next = if6_seq_next,
4135 .show = if6_seq_show,
4136 .stop = if6_seq_stop,
4137};
4138
4139static int if6_seq_open(struct inode *inode, struct file *file)
4140{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004141 return seq_open_net(inode, file, &if6_seq_ops,
4142 sizeof(struct if6_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004143}
4144
Arjan van de Ven9a321442007-02-12 00:55:35 -08004145static const struct file_operations if6_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004146 .owner = THIS_MODULE,
4147 .open = if6_seq_open,
4148 .read = seq_read,
4149 .llseek = seq_lseek,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004150 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004151};
4152
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004153static int __net_init if6_proc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004154{
Gao fengd4beaa62013-02-18 01:34:54 +00004155 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004156 return -ENOMEM;
4157 return 0;
4158}
4159
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004160static void __net_exit if6_proc_net_exit(struct net *net)
Daniel Lezcano3c400902008-01-10 22:42:49 -08004161{
Gao fengece31ff2013-02-18 01:34:56 +00004162 remove_proc_entry("if_inet6", net->proc_net);
Daniel Lezcano3c400902008-01-10 22:42:49 -08004163}
4164
4165static struct pernet_operations if6_proc_net_ops = {
Ian Morris67ba4152014-08-24 21:53:10 +01004166 .init = if6_proc_net_init,
4167 .exit = if6_proc_net_exit,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004168};
4169
4170int __init if6_proc_init(void)
4171{
4172 return register_pernet_subsys(&if6_proc_net_ops);
4173}
4174
Linus Torvalds1da177e2005-04-16 15:20:36 -07004175void if6_proc_exit(void)
4176{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004177 unregister_pernet_subsys(&if6_proc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004178}
4179#endif /* CONFIG_PROC_FS */
4180
Amerigo Wang07a93622012-10-29 16:23:10 +00004181#if IS_ENABLED(CONFIG_IPV6_MIP6)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004182/* Check if address is a home address configured on any interface. */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00004183int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004184{
4185 int ret = 0;
stephen hemmingerc2e21292010-03-17 20:31:10 +00004186 struct inet6_ifaddr *ifp = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00004187 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00004188
stephen hemminger5c578aed2010-03-17 20:31:11 +00004189 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08004190 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09004191 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano389f6612008-01-10 22:44:40 -08004192 continue;
YOSHIFUJI Hideakicaad2952008-04-10 15:42:07 +09004193 if (ipv6_addr_equal(&ifp->addr, addr) &&
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004194 (ifp->flags & IFA_F_HOMEADDRESS)) {
4195 ret = 1;
4196 break;
4197 }
4198 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00004199 rcu_read_unlock_bh();
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004200 return ret;
4201}
4202#endif
4203
Linus Torvalds1da177e2005-04-16 15:20:36 -07004204/*
4205 * Periodic address status verification
4206 */
4207
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004208static void addrconf_verify_rtnl(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004209{
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004210 unsigned long now, next, next_sec, next_sched;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004211 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004212 int i;
4213
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004214 ASSERT_RTNL();
4215
stephen hemminger5c578aed2010-03-17 20:31:11 +00004216 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004217 now = jiffies;
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004218 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004219
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004220 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004221
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07004222 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004223restart:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004224 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004225 unsigned long age;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004226
Yasushi Asanofad8da32013-12-31 12:04:19 +09004227 /* When setting preferred_lft to a value not zero or
4228 * infinity, while valid_lft is infinity
4229 * IFA_F_PERMANENT has a non-infinity life time.
4230 */
4231 if ((ifp->flags & IFA_F_PERMANENT) &&
4232 (ifp->prefered_lft == INFINITY_LIFE_TIME))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004233 continue;
4234
4235 spin_lock(&ifp->lock);
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004236 /* We try to batch several events at once. */
4237 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004238
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004239 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4240 age >= ifp->valid_lft) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004241 spin_unlock(&ifp->lock);
4242 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004243 ipv6_del_addr(ifp);
4244 goto restart;
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004245 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4246 spin_unlock(&ifp->lock);
4247 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004248 } else if (age >= ifp->prefered_lft) {
Brian Haleya1ed0522009-07-02 07:10:52 +00004249 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004250 int deprecate = 0;
4251
4252 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4253 deprecate = 1;
4254 ifp->flags |= IFA_F_DEPRECATED;
4255 }
4256
Yasushi Asanofad8da32013-12-31 12:04:19 +09004257 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4258 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004259 next = ifp->tstamp + ifp->valid_lft * HZ;
4260
4261 spin_unlock(&ifp->lock);
4262
4263 if (deprecate) {
4264 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004265
4266 ipv6_ifa_notify(0, ifp);
4267 in6_ifa_put(ifp);
4268 goto restart;
4269 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004270 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4271 !(ifp->flags&IFA_F_TENTATIVE)) {
stephen hemminger88949cf2010-03-17 20:31:17 +00004272 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4273 ifp->idev->cnf.dad_transmits *
Jiri Pirko1f9248e2013-12-07 19:26:53 +01004274 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
stephen hemminger88949cf2010-03-17 20:31:17 +00004275
Linus Torvalds1da177e2005-04-16 15:20:36 -07004276 if (age >= ifp->prefered_lft - regen_advance) {
4277 struct inet6_ifaddr *ifpub = ifp->ifpub;
4278 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4279 next = ifp->tstamp + ifp->prefered_lft * HZ;
4280 if (!ifp->regen_count && ifpub) {
4281 ifp->regen_count++;
4282 in6_ifa_hold(ifp);
4283 in6_ifa_hold(ifpub);
4284 spin_unlock(&ifp->lock);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004285
Hiroyuki YAMAMORI291d8092005-12-23 11:24:05 -08004286 spin_lock(&ifpub->lock);
4287 ifpub->regen_count = 0;
4288 spin_unlock(&ifpub->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004289 ipv6_create_tempaddr(ifpub, ifp);
4290 in6_ifa_put(ifpub);
4291 in6_ifa_put(ifp);
4292 goto restart;
4293 }
4294 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4295 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4296 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004297 } else {
4298 /* ifp->prefered_lft <= ifp->valid_lft */
4299 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4300 next = ifp->tstamp + ifp->prefered_lft * HZ;
4301 spin_unlock(&ifp->lock);
4302 }
4303 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004304 }
4305
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004306 next_sec = round_jiffies_up(next);
4307 next_sched = next;
4308
4309 /* If rounded timeout is accurate enough, accept it. */
4310 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4311 next_sched = next_sec;
4312
4313 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4314 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4315 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4316
dingtianhongba3542e2013-08-17 10:27:04 +08004317 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4318 now, next, next_sec, next_sched);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004319 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004320 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004321}
4322
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004323static void addrconf_verify_work(struct work_struct *w)
4324{
4325 rtnl_lock();
4326 addrconf_verify_rtnl();
4327 rtnl_unlock();
4328}
4329
4330static void addrconf_verify(void)
4331{
4332 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4333}
4334
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004335static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4336 struct in6_addr **peer_pfx)
Thomas Graf461d8832006-09-18 00:09:49 -07004337{
4338 struct in6_addr *pfx = NULL;
4339
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004340 *peer_pfx = NULL;
4341
Thomas Graf461d8832006-09-18 00:09:49 -07004342 if (addr)
4343 pfx = nla_data(addr);
4344
4345 if (local) {
4346 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004347 *peer_pfx = pfx;
4348 pfx = nla_data(local);
Thomas Graf461d8832006-09-18 00:09:49 -07004349 }
4350
4351 return pfx;
4352}
4353
Patrick McHardyef7c79e2007-06-05 12:38:30 -07004354static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
Thomas Graf461d8832006-09-18 00:09:49 -07004355 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4356 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4357 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
Jiri Pirko479840f2013-12-06 09:45:21 +01004358 [IFA_FLAGS] = { .len = sizeof(u32) },
Thomas Graf461d8832006-09-18 00:09:49 -07004359};
4360
Linus Torvalds1da177e2005-04-16 15:20:36 -07004361static int
Thomas Graf661d2962013-03-21 07:45:29 +00004362inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004363{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004364 struct net *net = sock_net(skb->sk);
Thomas Grafb933f712006-09-18 00:10:19 -07004365 struct ifaddrmsg *ifm;
4366 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004367 struct in6_addr *pfx, *peer_pfx;
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004368 u32 ifa_flags;
Thomas Grafb933f712006-09-18 00:10:19 -07004369 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004370
Thomas Grafb933f712006-09-18 00:10:19 -07004371 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4372 if (err < 0)
4373 return err;
4374
4375 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004376 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004377 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004378 return -EINVAL;
4379
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004380 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4381
4382 /* We ignore other flags so far. */
4383 ifa_flags &= IFA_F_MANAGETEMPADDR;
4384
4385 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4386 ifm->ifa_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004387}
4388
Jiri Pirko479840f2013-12-06 09:45:21 +01004389static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004390 u32 prefered_lft, u32 valid_lft)
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004391{
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004392 u32 flags;
4393 clock_t expires;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004394 unsigned long timeout;
Jiri Pirko53bd6742013-12-06 09:45:22 +01004395 bool was_managetempaddr;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004396 bool had_prefixroute;
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09004397
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004398 ASSERT_RTNL();
4399
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004400 if (!valid_lft || (prefered_lft > valid_lft))
4401 return -EINVAL;
4402
Jiri Pirko53bd6742013-12-06 09:45:22 +01004403 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4404 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4405 return -EINVAL;
4406
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004407 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4408 if (addrconf_finite_timeout(timeout)) {
4409 expires = jiffies_to_clock_t(timeout * HZ);
4410 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004411 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004412 } else {
4413 expires = 0;
4414 flags = 0;
4415 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004416 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004417
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004418 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4419 if (addrconf_finite_timeout(timeout)) {
4420 if (timeout == 0)
4421 ifa_flags |= IFA_F_DEPRECATED;
4422 prefered_lft = timeout;
4423 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004424
4425 spin_lock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004426 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004427 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4428 !(ifp->flags & IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004429 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
Thomas Haller761aac72014-01-15 15:36:58 +01004430 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4431 IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004432 ifp->flags |= ifa_flags;
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004433 ifp->tstamp = jiffies;
4434 ifp->valid_lft = valid_lft;
4435 ifp->prefered_lft = prefered_lft;
4436
4437 spin_unlock_bh(&ifp->lock);
4438 if (!(ifp->flags&IFA_F_TENTATIVE))
4439 ipv6_ifa_notify(0, ifp);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004440
Thomas Haller761aac72014-01-15 15:36:58 +01004441 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4442 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4443 expires, flags);
Thomas Haller5b84efe2014-01-15 15:36:59 +01004444 } else if (had_prefixroute) {
4445 enum cleanup_prefix_rt_t action;
4446 unsigned long rt_expires;
4447
4448 write_lock_bh(&ifp->idev->lock);
4449 action = check_cleanup_prefix_route(ifp, &rt_expires);
4450 write_unlock_bh(&ifp->idev->lock);
4451
4452 if (action != CLEANUP_PREFIX_RT_NOP) {
4453 cleanup_prefix_route(ifp, rt_expires,
4454 action == CLEANUP_PREFIX_RT_DEL);
4455 }
Thomas Haller761aac72014-01-15 15:36:58 +01004456 }
Jiri Pirko53bd6742013-12-06 09:45:22 +01004457
4458 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4459 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4460 valid_lft = prefered_lft = 0;
4461 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4462 !was_managetempaddr, jiffies);
4463 }
4464
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004465 addrconf_verify_rtnl();
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004466
4467 return 0;
4468}
4469
4470static int
Thomas Graf661d2962013-03-21 07:45:29 +00004471inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004472{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004473 struct net *net = sock_net(skb->sk);
Thomas Graf461d8832006-09-18 00:09:49 -07004474 struct ifaddrmsg *ifm;
4475 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004476 struct in6_addr *pfx, *peer_pfx;
Thomas Graf7198f8c2006-09-18 00:13:46 -07004477 struct inet6_ifaddr *ifa;
4478 struct net_device *dev;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004479 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
Jiri Pirko479840f2013-12-06 09:45:21 +01004480 u32 ifa_flags;
Thomas Graf461d8832006-09-18 00:09:49 -07004481 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004482
Thomas Graf461d8832006-09-18 00:09:49 -07004483 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4484 if (err < 0)
4485 return err;
4486
4487 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004488 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004489 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004490 return -EINVAL;
4491
Thomas Graf461d8832006-09-18 00:09:49 -07004492 if (tb[IFA_CACHEINFO]) {
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004493 struct ifa_cacheinfo *ci;
Thomas Graf461d8832006-09-18 00:09:49 -07004494
4495 ci = nla_data(tb[IFA_CACHEINFO]);
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004496 valid_lft = ci->ifa_valid;
Thomas Graf461d8832006-09-18 00:09:49 -07004497 preferred_lft = ci->ifa_prefered;
4498 } else {
4499 preferred_lft = INFINITY_LIFE_TIME;
4500 valid_lft = INFINITY_LIFE_TIME;
Noriaki TAKAMIYA07787692006-07-28 18:12:10 +09004501 }
4502
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004503 dev = __dev_get_by_index(net, ifm->ifa_index);
Ian Morris63159f22015-03-29 14:00:04 +01004504 if (!dev)
Thomas Graf7198f8c2006-09-18 00:13:46 -07004505 return -ENODEV;
4506
Jiri Pirko479840f2013-12-06 09:45:21 +01004507 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4508
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004509 /* We ignore other flags so far. */
Thomas Haller761aac72014-01-15 15:36:58 +01004510 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
Madhu Challa93a714d2015-02-25 09:58:35 -08004511 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004512
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08004513 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
Ian Morris63159f22015-03-29 14:00:04 +01004514 if (!ifa) {
Thomas Graf7198f8c2006-09-18 00:13:46 -07004515 /*
4516 * It would be best to check for !NLM_F_CREATE here but
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08004517 * userspace already relies on not having to provide this.
Thomas Graf7198f8c2006-09-18 00:13:46 -07004518 */
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004519 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004520 ifm->ifa_prefixlen, ifa_flags,
4521 preferred_lft, valid_lft);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004522 }
4523
Thomas Graf7198f8c2006-09-18 00:13:46 -07004524 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4525 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4526 err = -EEXIST;
4527 else
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004528 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
Thomas Graf7198f8c2006-09-18 00:13:46 -07004529
4530 in6_ifa_put(ifa);
4531
4532 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004533}
4534
Jiri Pirko479840f2013-12-06 09:45:21 +01004535static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
Thomas Graf101bb222006-09-18 00:11:52 -07004536 u8 scope, int ifindex)
4537{
4538 struct ifaddrmsg *ifm;
4539
4540 ifm = nlmsg_data(nlh);
4541 ifm->ifa_family = AF_INET6;
4542 ifm->ifa_prefixlen = prefixlen;
4543 ifm->ifa_flags = flags;
4544 ifm->ifa_scope = scope;
4545 ifm->ifa_index = ifindex;
4546}
4547
Thomas Graf85486af2006-09-18 00:11:24 -07004548static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4549 unsigned long tstamp, u32 preferred, u32 valid)
4550{
4551 struct ifa_cacheinfo ci;
4552
Thomas Graf18a31e12010-11-17 04:12:02 +00004553 ci.cstamp = cstamp_delta(cstamp);
4554 ci.tstamp = cstamp_delta(tstamp);
Thomas Graf85486af2006-09-18 00:11:24 -07004555 ci.ifa_prefered = preferred;
4556 ci.ifa_valid = valid;
4557
4558 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4559}
4560
Thomas Graf101bb222006-09-18 00:11:52 -07004561static inline int rt_scope(int ifa_scope)
4562{
4563 if (ifa_scope & IFA_HOST)
4564 return RT_SCOPE_HOST;
4565 else if (ifa_scope & IFA_LINK)
4566 return RT_SCOPE_LINK;
4567 else if (ifa_scope & IFA_SITE)
4568 return RT_SCOPE_SITE;
4569 else
4570 return RT_SCOPE_UNIVERSE;
4571}
4572
Thomas Graf0ab68032006-09-18 00:12:35 -07004573static inline int inet6_ifaddr_msgsize(void)
4574{
Thomas Graf339bf982006-11-10 14:10:15 -08004575 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004576 + nla_total_size(16) /* IFA_LOCAL */
Thomas Graf339bf982006-11-10 14:10:15 -08004577 + nla_total_size(16) /* IFA_ADDRESS */
Jiri Pirko479840f2013-12-06 09:45:21 +01004578 + nla_total_size(sizeof(struct ifa_cacheinfo))
4579 + nla_total_size(4) /* IFA_FLAGS */;
Thomas Graf0ab68032006-09-18 00:12:35 -07004580}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07004581
Linus Torvalds1da177e2005-04-16 15:20:36 -07004582static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004583 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004584{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004585 struct nlmsghdr *nlh;
Thomas Graf85486af2006-09-18 00:11:24 -07004586 u32 preferred, valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004587
Eric W. Biederman15e47302012-09-07 20:12:54 +00004588 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004589 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004590 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004591
Thomas Graf101bb222006-09-18 00:11:52 -07004592 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4593 ifa->idev->dev->ifindex);
4594
Yasushi Asanofad8da32013-12-31 12:04:19 +09004595 if (!((ifa->flags&IFA_F_PERMANENT) &&
4596 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
Thomas Graf85486af2006-09-18 00:11:24 -07004597 preferred = ifa->prefered_lft;
4598 valid = ifa->valid_lft;
4599 if (preferred != INFINITY_LIFE_TIME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004600 long tval = (jiffies - ifa->tstamp)/HZ;
Jens Rosenbooma1faa692009-06-25 04:55:50 +00004601 if (preferred > tval)
4602 preferred -= tval;
4603 else
4604 preferred = 0;
Ben Hutchingsf56619f2010-06-26 11:37:47 +00004605 if (valid != INFINITY_LIFE_TIME) {
4606 if (valid > tval)
4607 valid -= tval;
4608 else
4609 valid = 0;
4610 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004611 }
4612 } else {
Thomas Graf85486af2006-09-18 00:11:24 -07004613 preferred = INFINITY_LIFE_TIME;
4614 valid = INFINITY_LIFE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004615 }
Thomas Graf85486af2006-09-18 00:11:24 -07004616
Cong Wang7996c792013-05-22 05:41:06 +00004617 if (!ipv6_addr_any(&ifa->peer_addr)) {
Jiri Benc930345e2015-03-29 16:59:25 +02004618 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4619 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004620 goto error;
4621 } else
Jiri Benc930345e2015-03-29 16:59:25 +02004622 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004623 goto error;
4624
4625 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4626 goto error;
Thomas Graf85486af2006-09-18 00:11:24 -07004627
Jiri Pirko479840f2013-12-06 09:45:21 +01004628 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4629 goto error;
4630
Johannes Berg053c0952015-01-16 22:09:00 +01004631 nlmsg_end(skb, nlh);
4632 return 0;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004633
4634error:
4635 nlmsg_cancel(skb, nlh);
4636 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004637}
4638
4639static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004640 u32 portid, u32 seq, int event, u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004641{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004642 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004643 u8 scope = RT_SCOPE_UNIVERSE;
4644 int ifindex = ifmca->idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004645
Thomas Graf101bb222006-09-18 00:11:52 -07004646 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4647 scope = RT_SCOPE_SITE;
4648
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, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004654 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004655 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004656 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4657 nlmsg_cancel(skb, nlh);
4658 return -EMSGSIZE;
4659 }
Thomas Graf85486af2006-09-18 00:11:24 -07004660
Johannes Berg053c0952015-01-16 22:09:00 +01004661 nlmsg_end(skb, nlh);
4662 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004663}
4664
4665static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004666 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004667{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004668 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004669 u8 scope = RT_SCOPE_UNIVERSE;
4670 int ifindex = ifaca->aca_idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004671
Thomas Graf101bb222006-09-18 00:11:52 -07004672 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4673 scope = RT_SCOPE_SITE;
4674
Eric W. Biederman15e47302012-09-07 20:12:54 +00004675 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004676 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004677 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004678
Thomas Graf101bb222006-09-18 00:11:52 -07004679 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004680 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004681 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004682 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4683 nlmsg_cancel(skb, nlh);
4684 return -EMSGSIZE;
4685 }
Thomas Graf85486af2006-09-18 00:11:24 -07004686
Johannes Berg053c0952015-01-16 22:09:00 +01004687 nlmsg_end(skb, nlh);
4688 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004689}
4690
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004691enum addr_type_t {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004692 UNICAST_ADDR,
4693 MULTICAST_ADDR,
4694 ANYCAST_ADDR,
4695};
4696
Eric Dumazet234b27c2009-11-12 04:11:50 +00004697/* called with rcu_read_lock() */
4698static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4699 struct netlink_callback *cb, enum addr_type_t type,
4700 int s_ip_idx, int *p_ip_idx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004701{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004702 struct ifmcaddr6 *ifmca;
4703 struct ifacaddr6 *ifaca;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004704 int err = 1;
4705 int ip_idx = *p_ip_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004706
Eric Dumazet234b27c2009-11-12 04:11:50 +00004707 read_lock_bh(&idev->lock);
4708 switch (type) {
stephen hemminger502a2ff2010-03-17 20:31:13 +00004709 case UNICAST_ADDR: {
4710 struct inet6_ifaddr *ifa;
4711
Eric Dumazet234b27c2009-11-12 04:11:50 +00004712 /* unicast address incl. temp addr */
stephen hemminger502a2ff2010-03-17 20:31:13 +00004713 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4714 if (++ip_idx < s_ip_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004715 continue;
4716 err = inet6_fill_ifaddr(skb, ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004717 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004718 cb->nlh->nlmsg_seq,
4719 RTM_NEWADDR,
4720 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004721 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004722 break;
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004723 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004724 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004725 break;
stephen hemminger502a2ff2010-03-17 20:31:13 +00004726 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004727 case MULTICAST_ADDR:
4728 /* multicast address */
4729 for (ifmca = idev->mc_list; ifmca;
4730 ifmca = ifmca->next, ip_idx++) {
4731 if (ip_idx < s_ip_idx)
4732 continue;
4733 err = inet6_fill_ifmcaddr(skb, ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004734 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004735 cb->nlh->nlmsg_seq,
4736 RTM_GETMULTICAST,
4737 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004738 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004739 break;
4740 }
4741 break;
4742 case ANYCAST_ADDR:
4743 /* anycast address */
4744 for (ifaca = idev->ac_list; ifaca;
4745 ifaca = ifaca->aca_next, ip_idx++) {
4746 if (ip_idx < s_ip_idx)
4747 continue;
4748 err = inet6_fill_ifacaddr(skb, ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004749 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004750 cb->nlh->nlmsg_seq,
4751 RTM_GETANYCAST,
4752 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004753 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004754 break;
4755 }
4756 break;
4757 default:
4758 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004759 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004760 read_unlock_bh(&idev->lock);
4761 *p_ip_idx = ip_idx;
4762 return err;
4763}
4764
4765static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4766 enum addr_type_t type)
4767{
4768 struct net *net = sock_net(skb->sk);
4769 int h, s_h;
4770 int idx, ip_idx;
4771 int s_idx, s_ip_idx;
4772 struct net_device *dev;
4773 struct inet6_dev *idev;
4774 struct hlist_head *head;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004775
4776 s_h = cb->args[0];
4777 s_idx = idx = cb->args[1];
4778 s_ip_idx = ip_idx = cb->args[2];
4779
4780 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004781 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004782 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4783 idx = 0;
4784 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08004785 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet234b27c2009-11-12 04:11:50 +00004786 if (idx < s_idx)
4787 goto cont;
Patrick McHardy4b97efd2010-03-26 20:27:49 -07004788 if (h > s_h || idx > s_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004789 s_ip_idx = 0;
4790 ip_idx = 0;
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004791 idev = __in6_dev_get(dev);
4792 if (!idev)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004793 goto cont;
4794
4795 if (in6_dump_addrs(idev, skb, cb, type,
David S. Miller7b46a642015-01-18 23:36:08 -05004796 s_ip_idx, &ip_idx) < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004797 goto done;
4798cont:
4799 idx++;
4800 }
4801 }
4802done:
4803 rcu_read_unlock();
4804 cb->args[0] = h;
4805 cb->args[1] = idx;
4806 cb->args[2] = ip_idx;
4807
Linus Torvalds1da177e2005-04-16 15:20:36 -07004808 return skb->len;
4809}
4810
4811static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4812{
4813 enum addr_type_t type = UNICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004814
Linus Torvalds1da177e2005-04-16 15:20:36 -07004815 return inet6_dump_addr(skb, cb, type);
4816}
4817
4818static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4819{
4820 enum addr_type_t type = MULTICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004821
Linus Torvalds1da177e2005-04-16 15:20:36 -07004822 return inet6_dump_addr(skb, cb, type);
4823}
4824
4825
4826static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4827{
4828 enum addr_type_t type = ANYCAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004829
Linus Torvalds1da177e2005-04-16 15:20:36 -07004830 return inet6_dump_addr(skb, cb, type);
4831}
4832
Thomas Graf661d2962013-03-21 07:45:29 +00004833static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004834{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004835 struct net *net = sock_net(in_skb->sk);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004836 struct ifaddrmsg *ifm;
4837 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004838 struct in6_addr *addr = NULL, *peer;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004839 struct net_device *dev = NULL;
4840 struct inet6_ifaddr *ifa;
4841 struct sk_buff *skb;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004842 int err;
4843
Thomas Graf1b29fc22006-09-18 00:10:50 -07004844 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4845 if (err < 0)
4846 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004847
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004848 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
Ian Morris63159f22015-03-29 14:00:04 +01004849 if (!addr) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004850 err = -EINVAL;
4851 goto errout;
4852 }
4853
4854 ifm = nlmsg_data(nlh);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004855 if (ifm->ifa_index)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004856 dev = __dev_get_by_index(net, ifm->ifa_index);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004857
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004858 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4859 if (!ifa) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004860 err = -EADDRNOTAVAIL;
4861 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004862 }
4863
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004864 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4865 if (!skb) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004866 err = -ENOBUFS;
4867 goto errout_ifa;
4868 }
4869
Eric W. Biederman15e47302012-09-07 20:12:54 +00004870 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004871 nlh->nlmsg_seq, RTM_NEWADDR, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004872 if (err < 0) {
4873 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4874 WARN_ON(err == -EMSGSIZE);
4875 kfree_skb(skb);
4876 goto errout_ifa;
4877 }
Eric W. Biederman15e47302012-09-07 20:12:54 +00004878 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004879errout_ifa:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004880 in6_ifa_put(ifa);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004881errout:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004882 return err;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004883}
4884
Linus Torvalds1da177e2005-04-16 15:20:36 -07004885static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4886{
4887 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09004888 struct net *net = dev_net(ifa->idev->dev);
Thomas Graf5d620262006-08-15 00:35:02 -07004889 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004890
Thomas Graf0ab68032006-09-18 00:12:35 -07004891 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01004892 if (!skb)
Thomas Graf5d620262006-08-15 00:35:02 -07004893 goto errout;
4894
4895 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004896 if (err < 0) {
4897 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4898 WARN_ON(err == -EMSGSIZE);
4899 kfree_skb(skb);
4900 goto errout;
4901 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08004902 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4903 return;
Thomas Graf5d620262006-08-15 00:35:02 -07004904errout:
4905 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004906 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004907}
4908
Dave Jonesb6f99a22007-03-22 12:27:49 -07004909static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004910 __s32 *array, int bytes)
4911{
Thomas Graf04561c12006-11-14 19:53:58 -08004912 BUG_ON(bytes < (DEVCONF_MAX * 4));
4913
Linus Torvalds1da177e2005-04-16 15:20:36 -07004914 memset(array, 0, bytes);
4915 array[DEVCONF_FORWARDING] = cnf->forwarding;
4916 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4917 array[DEVCONF_MTU6] = cnf->mtu6;
4918 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4919 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4920 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4921 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4922 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
Thomas Graf93908d12010-11-17 01:44:24 +00004923 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4924 jiffies_to_msecs(cnf->rtr_solicit_interval);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004925 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4926 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
Thomas Graf93908d12010-11-17 01:44:24 +00004927 array[DEVCONF_RTR_SOLICIT_DELAY] =
4928 jiffies_to_msecs(cnf->rtr_solicit_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004929 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +02004930 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4931 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4932 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4933 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004934 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4935 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4936 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4937 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4938 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004939 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08004940 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
Hangbin Liu8013d1d2015-07-30 14:28:42 +08004941 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -08004942 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08004943#ifdef CONFIG_IPV6_ROUTER_PREF
4944 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
Thomas Graf93908d12010-11-17 01:44:24 +00004945 array[DEVCONF_RTR_PROBE_INTERVAL] =
4946 jiffies_to_msecs(cnf->rtr_probe_interval);
Neil Hormanfa03ef32007-01-30 14:30:10 -08004947#ifdef CONFIG_IPV6_ROUTE_INFO
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08004948 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4949#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08004950#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -07004951 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -07004952 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
Neil Horman95c385b2007-04-25 17:08:10 -07004953#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4954 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
Erik Kline7fd25612014-10-28 18:11:14 +09004955 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
Neil Horman95c385b2007-04-25 17:08:10 -07004956#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09004957#ifdef CONFIG_IPV6_MROUTE
4958 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4959#endif
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +09004960 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09004961 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
Cosmin Ratiuc3faca02009-10-09 03:11:14 +00004962 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +00004963 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +02004964 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
Ben Greeard9333192014-06-25 14:44:53 -07004965 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
Harout Hedeshianc2943f12015-01-20 10:06:05 -07004966 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
Andy Gospodarek35103d12015-08-13 10:39:01 -04004967 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01004968 /* we omit DEVCONF_STABLE_SECRET for now */
Erik Kline3985e8a2015-07-22 16:38:25 +09004969 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
Johannes Bergabbc3042016-02-04 13:31:19 +01004970 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
Johannes Berg7a02bf82016-02-04 13:31:20 +01004971 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
David Ahernf1705ec2016-02-24 09:25:37 -08004972 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
David Lebrun1ababeb2016-11-08 14:57:39 +01004973 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
David Lebrunbf355b82016-11-08 14:57:42 +01004974#ifdef CONFIG_IPV6_SEG6_HMAC
4975 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
4976#endif
Erik Nordmarkadc176c2016-12-02 14:00:08 -08004977 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004978}
4979
Thomas Grafb382b192010-11-16 04:33:57 +00004980static inline size_t inet6_ifla6_size(void)
4981{
4982 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4983 + nla_total_size(sizeof(struct ifla_cacheinfo))
4984 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4985 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
Daniel Borkmannf53adae2013-04-08 04:01:30 +00004986 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4987 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
Thomas Grafb382b192010-11-16 04:33:57 +00004988}
4989
Thomas Graf339bf982006-11-10 14:10:15 -08004990static inline size_t inet6_if_nlmsg_size(void)
4991{
4992 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4993 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4994 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4995 + nla_total_size(4) /* IFLA_MTU */
4996 + nla_total_size(4) /* IFLA_LINK */
Andy Gospodarek03443382015-08-13 15:26:35 -04004997 + nla_total_size(1) /* IFLA_OPERSTATE */
Thomas Grafb382b192010-11-16 04:33:57 +00004998 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
Thomas Graf339bf982006-11-10 14:10:15 -08004999}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005000
Eric Dumazetbe281e52011-05-19 01:14:23 +00005001static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
Jia Heaca05672016-09-30 11:29:03 +08005002 int bytes)
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005003{
5004 int i;
Jia Heaca05672016-09-30 11:29:03 +08005005 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005006 BUG_ON(pad < 0);
5007
5008 /* Use put_unaligned() because stats may not be aligned for u64. */
Jia Heaca05672016-09-30 11:29:03 +08005009 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5010 for (i = 1; i < ICMP6_MIB_MAX; i++)
Eric Dumazetbe281e52011-05-19 01:14:23 +00005011 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005012
Jia Heaca05672016-09-30 11:29:03 +08005013 memset(&stats[ICMP6_MIB_MAX], 0, pad);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005014}
5015
WANG Cong698365f2014-05-05 15:55:55 -07005016static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305017 int bytes, size_t syncpoff)
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005018{
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305019 int i, c;
5020 u64 buff[IPSTATS_MIB_MAX];
5021 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5022
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005023 BUG_ON(pad < 0);
5024
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305025 memset(buff, 0, sizeof(buff));
5026 buff[0] = IPSTATS_MIB_MAX;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005027
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305028 for_each_possible_cpu(c) {
5029 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5030 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5031 }
5032
5033 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5034 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005035}
5036
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005037static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5038 int bytes)
5039{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07005040 switch (attrtype) {
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005041 case IFLA_INET6_STATS:
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305042 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5043 offsetof(struct ipstats_mib, syncp));
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005044 break;
5045 case IFLA_INET6_ICMP6STATS:
Jia Heaca05672016-09-30 11:29:03 +08005046 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005047 break;
5048 }
5049}
5050
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005051static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5052 u32 ext_filter_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005053{
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005054 struct nlattr *nla;
Thomas Graf04561c12006-11-14 19:53:58 -08005055 struct ifla_cacheinfo ci;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005056
David S. Millerc78679e2012-04-01 20:27:33 -04005057 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5058 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005059 ci.max_reasm_len = IPV6_MAXPLEN;
David S. Miller24912422010-11-19 13:13:47 -08005060 ci.tstamp = cstamp_delta(idev->tstamp);
5061 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
Jiri Pirko1f9248e2013-12-07 19:26:53 +01005062 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
David S. Millerc78679e2012-04-01 20:27:33 -04005063 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5064 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005065 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
Ian Morris63159f22015-03-29 14:00:04 +01005066 if (!nla)
Thomas Graf04561c12006-11-14 19:53:58 -08005067 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005068 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005069
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005070 /* XXX - MC not implemented */
5071
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005072 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5073 return 0;
5074
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005075 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005076 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005077 goto nla_put_failure;
5078 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5079
5080 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005081 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005082 goto nla_put_failure;
5083 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005084
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005085 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
Ian Morris63159f22015-03-29 14:00:04 +01005086 if (!nla)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005087 goto nla_put_failure;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005088
5089 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5090 goto nla_put_failure;
5091
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005092 read_lock_bh(&idev->lock);
5093 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5094 read_unlock_bh(&idev->lock);
5095
Thomas Grafb382b192010-11-16 04:33:57 +00005096 return 0;
5097
5098nla_put_failure:
5099 return -EMSGSIZE;
5100}
5101
Arad, Ronenb1974ed2015-10-19 09:23:28 -07005102static size_t inet6_get_link_af_size(const struct net_device *dev,
5103 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005104{
5105 if (!__in6_dev_get(dev))
5106 return 0;
5107
5108 return inet6_ifla6_size();
5109}
5110
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005111static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5112 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005113{
5114 struct inet6_dev *idev = __in6_dev_get(dev);
5115
5116 if (!idev)
5117 return -ENODATA;
5118
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005119 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005120 return -EMSGSIZE;
5121
5122 return 0;
5123}
5124
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005125static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5126{
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005127 struct inet6_ifaddr *ifp;
5128 struct net_device *dev = idev->dev;
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005129 bool clear_token, update_rs = false;
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005130 struct in6_addr ll_addr;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005131
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005132 ASSERT_RTNL();
5133
Ian Morris63159f22015-03-29 14:00:04 +01005134 if (!token)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005135 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005136 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5137 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005138 if (!ipv6_accept_ra(idev))
5139 return -EINVAL;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005140 if (idev->cnf.rtr_solicits == 0)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005141 return -EINVAL;
5142
5143 write_lock_bh(&idev->lock);
5144
5145 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5146 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5147
5148 write_unlock_bh(&idev->lock);
5149
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005150 clear_token = ipv6_addr_any(token);
5151 if (clear_token)
5152 goto update_lft;
5153
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005154 if (!idev->dead && (idev->if_flags & IF_READY) &&
5155 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5156 IFA_F_OPTIMISTIC)) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005157 /* If we're not ready, then normal ifup will take care
5158 * of this. Otherwise, we need to request our rs here.
5159 */
5160 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5161 update_rs = true;
5162 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005163
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005164update_lft:
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005165 write_lock_bh(&idev->lock);
Daniel Borkmannfc403832013-04-09 03:47:15 +00005166
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005167 if (update_rs) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005168 idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005169 idev->rs_interval = rfc3315_s14_backoff_init(
5170 idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005171 idev->rs_probes = 1;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005172 addrconf_mod_rs_timer(idev, idev->rs_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005173 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005174
5175 /* Well, that's kinda nasty ... */
5176 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5177 spin_lock(&ifp->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00005178 if (ifp->tokenized) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005179 ifp->valid_lft = 0;
5180 ifp->prefered_lft = 0;
5181 }
5182 spin_unlock(&ifp->lock);
5183 }
5184
5185 write_unlock_bh(&idev->lock);
Lubomir Rintelb2ed64a2014-10-27 17:39:16 +01005186 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005187 addrconf_verify_rtnl();
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005188 return 0;
5189}
5190
Daniel Borkmann11b1f822015-02-05 14:39:11 +01005191static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5192 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5193 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5194};
5195
5196static int inet6_validate_link_af(const struct net_device *dev,
5197 const struct nlattr *nla)
5198{
5199 struct nlattr *tb[IFLA_INET6_MAX + 1];
5200
5201 if (dev && !__in6_dev_get(dev))
5202 return -EAFNOSUPPORT;
5203
5204 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5205}
5206
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005207static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5208{
5209 int err = -EINVAL;
5210 struct inet6_dev *idev = __in6_dev_get(dev);
5211 struct nlattr *tb[IFLA_INET6_MAX + 1];
5212
5213 if (!idev)
5214 return -EAFNOSUPPORT;
5215
5216 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5217 BUG();
5218
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005219 if (tb[IFLA_INET6_TOKEN]) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005220 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005221 if (err)
5222 return err;
5223 }
5224
5225 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5226 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5227
5228 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01005229 mode != IN6_ADDR_GEN_MODE_NONE &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01005230 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5231 mode != IN6_ADDR_GEN_MODE_RANDOM)
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005232 return -EINVAL;
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01005233
5234 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5235 !idev->cnf.stable_secret.initialized &&
5236 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5237 return -EINVAL;
5238
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005239 idev->addr_gen_mode = mode;
5240 err = 0;
5241 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005242
5243 return err;
5244}
5245
Thomas Grafb382b192010-11-16 04:33:57 +00005246static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005247 u32 portid, u32 seq, int event, unsigned int flags)
Thomas Grafb382b192010-11-16 04:33:57 +00005248{
5249 struct net_device *dev = idev->dev;
5250 struct ifinfomsg *hdr;
5251 struct nlmsghdr *nlh;
5252 void *protoinfo;
5253
Eric W. Biederman15e47302012-09-07 20:12:54 +00005254 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005255 if (!nlh)
Thomas Grafb382b192010-11-16 04:33:57 +00005256 return -EMSGSIZE;
5257
5258 hdr = nlmsg_data(nlh);
5259 hdr->ifi_family = AF_INET6;
5260 hdr->__ifi_pad = 0;
5261 hdr->ifi_type = dev->type;
5262 hdr->ifi_index = dev->ifindex;
5263 hdr->ifi_flags = dev_get_flags(dev);
5264 hdr->ifi_change = 0;
5265
David S. Millerc78679e2012-04-01 20:27:33 -04005266 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5267 (dev->addr_len &&
5268 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5269 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
Nicolas Dichtela54acb32015-04-02 17:07:00 +02005270 (dev->ifindex != dev_get_iflink(dev) &&
Andy Gospodarek03443382015-08-13 15:26:35 -04005271 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5272 nla_put_u8(skb, IFLA_OPERSTATE,
5273 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
David S. Millerc78679e2012-04-01 20:27:33 -04005274 goto nla_put_failure;
Thomas Grafb382b192010-11-16 04:33:57 +00005275 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
Ian Morris63159f22015-03-29 14:00:04 +01005276 if (!protoinfo)
Thomas Grafb382b192010-11-16 04:33:57 +00005277 goto nla_put_failure;
5278
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005279 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005280 goto nla_put_failure;
5281
Thomas Graf04561c12006-11-14 19:53:58 -08005282 nla_nest_end(skb, protoinfo);
Johannes Berg053c0952015-01-16 22:09:00 +01005283 nlmsg_end(skb, nlh);
5284 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005285
Thomas Graf04561c12006-11-14 19:53:58 -08005286nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005287 nlmsg_cancel(skb, nlh);
5288 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005289}
5290
5291static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5292{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09005293 struct net *net = sock_net(skb->sk);
Eric Dumazet84d26972009-11-09 12:11:28 +00005294 int h, s_h;
David S. Miller434a8a52009-11-11 18:53:00 -08005295 int idx = 0, s_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005296 struct net_device *dev;
5297 struct inet6_dev *idev;
Eric Dumazet84d26972009-11-09 12:11:28 +00005298 struct hlist_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005299
Eric Dumazet84d26972009-11-09 12:11:28 +00005300 s_h = cb->args[0];
5301 s_idx = cb->args[1];
5302
5303 rcu_read_lock();
5304 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5305 idx = 0;
5306 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08005307 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet84d26972009-11-09 12:11:28 +00005308 if (idx < s_idx)
5309 goto cont;
5310 idev = __in6_dev_get(dev);
5311 if (!idev)
5312 goto cont;
5313 if (inet6_fill_ifinfo(skb, idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005314 NETLINK_CB(cb->skb).portid,
Eric Dumazet84d26972009-11-09 12:11:28 +00005315 cb->nlh->nlmsg_seq,
Johannes Berg053c0952015-01-16 22:09:00 +01005316 RTM_NEWLINK, NLM_F_MULTI) < 0)
Eric Dumazet84d26972009-11-09 12:11:28 +00005317 goto out;
Pavel Emelianov7562f872007-05-03 15:13:45 -07005318cont:
Eric Dumazet84d26972009-11-09 12:11:28 +00005319 idx++;
5320 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005321 }
Eric Dumazet84d26972009-11-09 12:11:28 +00005322out:
5323 rcu_read_unlock();
5324 cb->args[1] = idx;
5325 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005326
5327 return skb->len;
5328}
5329
5330void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5331{
5332 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005333 struct net *net = dev_net(idev->dev);
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005334 int err = -ENOBUFS;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005335
Thomas Graf339bf982006-11-10 14:10:15 -08005336 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005337 if (!skb)
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005338 goto errout;
5339
5340 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005341 if (err < 0) {
5342 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5343 WARN_ON(err == -EMSGSIZE);
5344 kfree_skb(skb);
5345 goto errout;
5346 }
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005347 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005348 return;
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005349errout:
5350 if (err < 0)
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005351 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005352}
5353
Thomas Graf339bf982006-11-10 14:10:15 -08005354static inline size_t inet6_prefix_nlmsg_size(void)
5355{
5356 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5357 + nla_total_size(sizeof(struct in6_addr))
5358 + nla_total_size(sizeof(struct prefix_cacheinfo));
5359}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005360
Linus Torvalds1da177e2005-04-16 15:20:36 -07005361static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005362 struct prefix_info *pinfo, u32 portid, u32 seq,
Thomas Graf6051e2f2006-11-14 19:54:19 -08005363 int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005364{
Thomas Graf6051e2f2006-11-14 19:54:19 -08005365 struct prefixmsg *pmsg;
5366 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005367 struct prefix_cacheinfo ci;
5368
Eric W. Biederman15e47302012-09-07 20:12:54 +00005369 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005370 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08005371 return -EMSGSIZE;
Thomas Graf6051e2f2006-11-14 19:54:19 -08005372
5373 pmsg = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005374 pmsg->prefix_family = AF_INET6;
Patrick McHardy8a470772005-06-28 12:56:45 -07005375 pmsg->prefix_pad1 = 0;
5376 pmsg->prefix_pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005377 pmsg->prefix_ifindex = idev->dev->ifindex;
5378 pmsg->prefix_len = pinfo->prefix_len;
5379 pmsg->prefix_type = pinfo->type;
Patrick McHardy8a470772005-06-28 12:56:45 -07005380 pmsg->prefix_pad3 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005381 pmsg->prefix_flags = 0;
5382 if (pinfo->onlink)
5383 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5384 if (pinfo->autoconf)
5385 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5386
David S. Millerc78679e2012-04-01 20:27:33 -04005387 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5388 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005389 ci.preferred_time = ntohl(pinfo->prefered);
5390 ci.valid_time = ntohl(pinfo->valid);
David S. Millerc78679e2012-04-01 20:27:33 -04005391 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5392 goto nla_put_failure;
Johannes Berg053c0952015-01-16 22:09:00 +01005393 nlmsg_end(skb, nlh);
5394 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005395
Thomas Graf6051e2f2006-11-14 19:54:19 -08005396nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005397 nlmsg_cancel(skb, nlh);
5398 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005399}
5400
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005401static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005402 struct prefix_info *pinfo)
5403{
5404 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005405 struct net *net = dev_net(idev->dev);
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005406 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005407
Thomas Graf339bf982006-11-10 14:10:15 -08005408 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005409 if (!skb)
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005410 goto errout;
5411
5412 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005413 if (err < 0) {
5414 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5415 WARN_ON(err == -EMSGSIZE);
5416 kfree_skb(skb);
5417 goto errout;
5418 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005419 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5420 return;
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005421errout:
5422 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08005423 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005424}
5425
Linus Torvalds1da177e2005-04-16 15:20:36 -07005426static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5427{
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005428 struct net *net = dev_net(ifp->idev->dev);
5429
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005430 if (event)
5431 ASSERT_RTNL();
5432
Linus Torvalds1da177e2005-04-16 15:20:36 -07005433 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5434
5435 switch (event) {
5436 case RTM_NEWADDR:
Neil Horman95c385b2007-04-25 17:08:10 -07005437 /*
5438 * If the address was optimistic
5439 * we inserted the route at the start of
5440 * our DAD process, so we don't need
5441 * to do it again
5442 */
5443 if (!(ifp->rt->rt6i_node))
5444 ip6_ins_rt(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005445 if (ifp->idev->cnf.forwarding)
5446 addrconf_join_anycast(ifp);
Cong Wang7996c792013-05-22 05:41:06 +00005447 if (!ipv6_addr_any(&ifp->peer_addr))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005448 addrconf_prefix_route(&ifp->peer_addr, 128,
5449 ifp->idev->dev, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005450 break;
5451 case RTM_DELADDR:
5452 if (ifp->idev->cnf.forwarding)
5453 addrconf_leave_anycast(ifp);
5454 addrconf_leave_solict(ifp->idev, &ifp->addr);
Cong Wang7996c792013-05-22 05:41:06 +00005455 if (!ipv6_addr_any(&ifp->peer_addr)) {
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005456 struct rt6_info *rt;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005457
Nicolas Dichtele7478df2014-09-03 23:59:22 +02005458 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5459 ifp->idev->dev, 0, 0);
Martin KaFai Lau8e3d5be2015-09-15 14:30:08 -07005460 if (rt)
5461 ip6_del_rt(rt);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005462 }
David Ahern38bd10c2016-04-21 20:56:12 -07005463 if (ifp->rt) {
5464 dst_hold(&ifp->rt->dst);
5465 ip6_del_rt(ifp->rt);
5466 }
Hannes Frederic Sowa705f1c82014-09-28 00:46:06 +02005467 rt_genid_bump_ipv6(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005468 break;
5469 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005470 atomic_inc(&net->ipv6.dev_addr_genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005471}
5472
5473static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5474{
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005475 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005476 if (likely(ifp->idev->dead == 0))
5477 __ipv6_ifa_notify(event, ifp);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005478 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005479}
5480
5481#ifdef CONFIG_SYSCTL
5482
5483static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005484int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005485 void __user *buffer, size_t *lenp, loff_t *ppos)
5486{
5487 int *valp = ctl->data;
5488 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005489 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005490 struct ctl_table lctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005491 int ret;
5492
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005493 /*
5494 * ctl->data points to idev->cnf.forwarding, we should
5495 * not modify it until we get the rtnl lock.
5496 */
5497 lctl = *ctl;
5498 lctl.data = &val;
5499
5500 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005501
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -08005502 if (write)
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +00005503 ret = addrconf_fixup_forwarding(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005504 if (ret)
5505 *ppos = pos;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005506 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005507}
5508
Marcelo Leitner77751422015-02-23 11:17:13 -03005509static
5510int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5511 void __user *buffer, size_t *lenp, loff_t *ppos)
5512{
5513 struct inet6_dev *idev = ctl->extra1;
5514 int min_mtu = IPV6_MIN_MTU;
5515 struct ctl_table lctl;
5516
5517 lctl = *ctl;
5518 lctl.extra1 = &min_mtu;
5519 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5520
5521 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5522}
5523
Brian Haley56d417b2009-06-01 03:07:33 -07005524static void dev_disable_change(struct inet6_dev *idev)
5525{
Cong Wang75538c22013-05-29 11:30:50 +08005526 struct netdev_notifier_info info;
5527
Brian Haley56d417b2009-06-01 03:07:33 -07005528 if (!idev || !idev->dev)
5529 return;
5530
Cong Wang75538c22013-05-29 11:30:50 +08005531 netdev_notifier_info_init(&info, idev->dev);
Brian Haley56d417b2009-06-01 03:07:33 -07005532 if (idev->cnf.disable_ipv6)
Cong Wang75538c22013-05-29 11:30:50 +08005533 addrconf_notify(NULL, NETDEV_DOWN, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005534 else
Cong Wang75538c22013-05-29 11:30:50 +08005535 addrconf_notify(NULL, NETDEV_UP, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005536}
5537
5538static void addrconf_disable_change(struct net *net, __s32 newf)
5539{
5540 struct net_device *dev;
5541 struct inet6_dev *idev;
5542
Eric Dumazetc6d14c82009-11-04 05:43:23 -08005543 rcu_read_lock();
5544 for_each_netdev_rcu(net, dev) {
Brian Haley56d417b2009-06-01 03:07:33 -07005545 idev = __in6_dev_get(dev);
5546 if (idev) {
5547 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5548 idev->cnf.disable_ipv6 = newf;
5549 if (changed)
5550 dev_disable_change(idev);
5551 }
Brian Haley56d417b2009-06-01 03:07:33 -07005552 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -08005553 rcu_read_unlock();
Brian Haley56d417b2009-06-01 03:07:33 -07005554}
5555
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005556static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
Brian Haley56d417b2009-06-01 03:07:33 -07005557{
5558 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005559 int old;
5560
5561 if (!rtnl_trylock())
5562 return restart_syscall();
Brian Haley56d417b2009-06-01 03:07:33 -07005563
5564 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005565 old = *p;
5566 *p = newf;
Brian Haley56d417b2009-06-01 03:07:33 -07005567
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005568 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5569 rtnl_unlock();
Brian Haley56d417b2009-06-01 03:07:33 -07005570 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005571 }
Brian Haley56d417b2009-06-01 03:07:33 -07005572
5573 if (p == &net->ipv6.devconf_all->disable_ipv6) {
Brian Haley56d417b2009-06-01 03:07:33 -07005574 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5575 addrconf_disable_change(net, newf);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005576 } else if ((!newf) ^ (!old))
Brian Haley56d417b2009-06-01 03:07:33 -07005577 dev_disable_change((struct inet6_dev *)table->extra1);
5578
5579 rtnl_unlock();
5580 return 0;
5581}
5582
5583static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005584int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
Brian Haley56d417b2009-06-01 03:07:33 -07005585 void __user *buffer, size_t *lenp, loff_t *ppos)
5586{
5587 int *valp = ctl->data;
5588 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005589 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005590 struct ctl_table lctl;
Brian Haley56d417b2009-06-01 03:07:33 -07005591 int ret;
5592
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005593 /*
5594 * ctl->data points to idev->cnf.disable_ipv6, we should
5595 * not modify it until we get the rtnl lock.
5596 */
5597 lctl = *ctl;
5598 lctl.data = &val;
5599
5600 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Brian Haley56d417b2009-06-01 03:07:33 -07005601
5602 if (write)
5603 ret = addrconf_disable_ipv6(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005604 if (ret)
5605 *ppos = pos;
Brian Haley56d417b2009-06-01 03:07:33 -07005606 return ret;
5607}
5608
stephen hemmingerc92d5492013-12-17 22:37:14 -08005609static
5610int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5611 void __user *buffer, size_t *lenp, loff_t *ppos)
5612{
5613 int *valp = ctl->data;
5614 int ret;
5615 int old, new;
5616
5617 old = *valp;
5618 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5619 new = *valp;
5620
5621 if (write && old != new) {
5622 struct net *net = ctl->extra2;
5623
5624 if (!rtnl_trylock())
5625 return restart_syscall();
5626
5627 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5628 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5629 NETCONFA_IFINDEX_DEFAULT,
5630 net->ipv6.devconf_dflt);
5631 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5632 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5633 NETCONFA_IFINDEX_ALL,
5634 net->ipv6.devconf_all);
5635 else {
5636 struct inet6_dev *idev = ctl->extra1;
5637
5638 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5639 idev->dev->ifindex,
5640 &idev->cnf);
5641 }
5642 rtnl_unlock();
5643 }
5644
5645 return ret;
5646}
5647
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005648static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5649 void __user *buffer, size_t *lenp,
5650 loff_t *ppos)
5651{
5652 int err;
5653 struct in6_addr addr;
5654 char str[IPV6_MAX_STRLEN];
5655 struct ctl_table lctl = *ctl;
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01005656 struct net *net = ctl->extra2;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005657 struct ipv6_stable_secret *secret = ctl->data;
5658
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01005659 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5660 return -EIO;
5661
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005662 lctl.maxlen = IPV6_MAX_STRLEN;
5663 lctl.data = str;
5664
5665 if (!rtnl_trylock())
5666 return restart_syscall();
5667
5668 if (!write && !secret->initialized) {
5669 err = -EIO;
5670 goto out;
5671 }
5672
WANG Cong5449a5c2015-12-21 10:55:45 -08005673 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5674 if (err >= sizeof(str)) {
5675 err = -EIO;
5676 goto out;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005677 }
5678
5679 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5680 if (err || !write)
5681 goto out;
5682
5683 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5684 err = -EIO;
5685 goto out;
5686 }
5687
5688 secret->initialized = true;
5689 secret->secret = addr;
5690
Hannes Frederic Sowa622c81d2015-03-23 23:36:01 +01005691 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5692 struct net_device *dev;
5693
5694 for_each_netdev(net, dev) {
5695 struct inet6_dev *idev = __in6_dev_get(dev);
5696
5697 if (idev) {
5698 idev->addr_gen_mode =
5699 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5700 }
5701 }
5702 } else {
5703 struct inet6_dev *idev = ctl->extra1;
5704
5705 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5706 }
5707
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005708out:
5709 rtnl_unlock();
5710
5711 return err;
5712}
stephen hemmingerc92d5492013-12-17 22:37:14 -08005713
Andy Gospodarek35103d12015-08-13 10:39:01 -04005714static
5715int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5716 int write,
5717 void __user *buffer,
5718 size_t *lenp,
5719 loff_t *ppos)
5720{
5721 int *valp = ctl->data;
5722 int val = *valp;
5723 loff_t pos = *ppos;
5724 struct ctl_table lctl;
5725 int ret;
5726
5727 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5728 * we should not modify it until we get the rtnl lock.
5729 */
5730 lctl = *ctl;
5731 lctl.data = &val;
5732
5733 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5734
5735 if (write)
5736 ret = addrconf_fixup_linkdown(ctl, valp, val);
5737 if (ret)
5738 *ppos = pos;
5739 return ret;
5740}
5741
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07005742static int minus_one = -1;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005743static const int one = 1;
5744static const int two_five_five = 255;
5745
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03005746static const struct ctl_table addrconf_sysctl[] = {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005747 {
5748 .procname = "forwarding",
5749 .data = &ipv6_devconf.forwarding,
5750 .maxlen = sizeof(int),
5751 .mode = 0644,
5752 .proc_handler = addrconf_sysctl_forward,
5753 },
5754 {
5755 .procname = "hop_limit",
5756 .data = &ipv6_devconf.hop_limit,
5757 .maxlen = sizeof(int),
5758 .mode = 0644,
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005759 .proc_handler = proc_dointvec_minmax,
5760 .extra1 = (void *)&one,
5761 .extra2 = (void *)&two_five_five,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005762 },
5763 {
5764 .procname = "mtu",
5765 .data = &ipv6_devconf.mtu6,
5766 .maxlen = sizeof(int),
5767 .mode = 0644,
5768 .proc_handler = addrconf_sysctl_mtu,
5769 },
5770 {
5771 .procname = "accept_ra",
5772 .data = &ipv6_devconf.accept_ra,
5773 .maxlen = sizeof(int),
5774 .mode = 0644,
5775 .proc_handler = proc_dointvec,
5776 },
5777 {
5778 .procname = "accept_redirects",
5779 .data = &ipv6_devconf.accept_redirects,
5780 .maxlen = sizeof(int),
5781 .mode = 0644,
5782 .proc_handler = proc_dointvec,
5783 },
5784 {
5785 .procname = "autoconf",
5786 .data = &ipv6_devconf.autoconf,
5787 .maxlen = sizeof(int),
5788 .mode = 0644,
5789 .proc_handler = proc_dointvec,
5790 },
5791 {
5792 .procname = "dad_transmits",
5793 .data = &ipv6_devconf.dad_transmits,
5794 .maxlen = sizeof(int),
5795 .mode = 0644,
5796 .proc_handler = proc_dointvec,
5797 },
5798 {
5799 .procname = "router_solicitations",
5800 .data = &ipv6_devconf.rtr_solicits,
5801 .maxlen = sizeof(int),
5802 .mode = 0644,
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07005803 .proc_handler = proc_dointvec_minmax,
5804 .extra1 = &minus_one,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005805 },
5806 {
5807 .procname = "router_solicitation_interval",
5808 .data = &ipv6_devconf.rtr_solicit_interval,
5809 .maxlen = sizeof(int),
5810 .mode = 0644,
5811 .proc_handler = proc_dointvec_jiffies,
5812 },
5813 {
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005814 .procname = "router_solicitation_max_interval",
5815 .data = &ipv6_devconf.rtr_solicit_max_interval,
5816 .maxlen = sizeof(int),
5817 .mode = 0644,
5818 .proc_handler = proc_dointvec_jiffies,
5819 },
5820 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005821 .procname = "router_solicitation_delay",
5822 .data = &ipv6_devconf.rtr_solicit_delay,
5823 .maxlen = sizeof(int),
5824 .mode = 0644,
5825 .proc_handler = proc_dointvec_jiffies,
5826 },
5827 {
5828 .procname = "force_mld_version",
5829 .data = &ipv6_devconf.force_mld_version,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
5832 .proc_handler = proc_dointvec,
5833 },
5834 {
5835 .procname = "mldv1_unsolicited_report_interval",
5836 .data =
5837 &ipv6_devconf.mldv1_unsolicited_report_interval,
5838 .maxlen = sizeof(int),
5839 .mode = 0644,
5840 .proc_handler = proc_dointvec_ms_jiffies,
5841 },
5842 {
5843 .procname = "mldv2_unsolicited_report_interval",
5844 .data =
5845 &ipv6_devconf.mldv2_unsolicited_report_interval,
5846 .maxlen = sizeof(int),
5847 .mode = 0644,
5848 .proc_handler = proc_dointvec_ms_jiffies,
5849 },
5850 {
5851 .procname = "use_tempaddr",
5852 .data = &ipv6_devconf.use_tempaddr,
5853 .maxlen = sizeof(int),
5854 .mode = 0644,
5855 .proc_handler = proc_dointvec,
5856 },
5857 {
5858 .procname = "temp_valid_lft",
5859 .data = &ipv6_devconf.temp_valid_lft,
5860 .maxlen = sizeof(int),
5861 .mode = 0644,
5862 .proc_handler = proc_dointvec,
5863 },
5864 {
5865 .procname = "temp_prefered_lft",
5866 .data = &ipv6_devconf.temp_prefered_lft,
5867 .maxlen = sizeof(int),
5868 .mode = 0644,
5869 .proc_handler = proc_dointvec,
5870 },
5871 {
5872 .procname = "regen_max_retry",
5873 .data = &ipv6_devconf.regen_max_retry,
5874 .maxlen = sizeof(int),
5875 .mode = 0644,
5876 .proc_handler = proc_dointvec,
5877 },
5878 {
5879 .procname = "max_desync_factor",
5880 .data = &ipv6_devconf.max_desync_factor,
5881 .maxlen = sizeof(int),
5882 .mode = 0644,
5883 .proc_handler = proc_dointvec,
5884 },
5885 {
5886 .procname = "max_addresses",
5887 .data = &ipv6_devconf.max_addresses,
5888 .maxlen = sizeof(int),
5889 .mode = 0644,
5890 .proc_handler = proc_dointvec,
5891 },
5892 {
5893 .procname = "accept_ra_defrtr",
5894 .data = &ipv6_devconf.accept_ra_defrtr,
5895 .maxlen = sizeof(int),
5896 .mode = 0644,
5897 .proc_handler = proc_dointvec,
5898 },
5899 {
5900 .procname = "accept_ra_min_hop_limit",
5901 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5902 .maxlen = sizeof(int),
5903 .mode = 0644,
5904 .proc_handler = proc_dointvec,
5905 },
5906 {
5907 .procname = "accept_ra_pinfo",
5908 .data = &ipv6_devconf.accept_ra_pinfo,
5909 .maxlen = sizeof(int),
5910 .mode = 0644,
5911 .proc_handler = proc_dointvec,
5912 },
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005913#ifdef CONFIG_IPV6_ROUTER_PREF
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005914 {
5915 .procname = "accept_ra_rtr_pref",
5916 .data = &ipv6_devconf.accept_ra_rtr_pref,
5917 .maxlen = sizeof(int),
5918 .mode = 0644,
5919 .proc_handler = proc_dointvec,
5920 },
5921 {
5922 .procname = "router_probe_interval",
5923 .data = &ipv6_devconf.rtr_probe_interval,
5924 .maxlen = sizeof(int),
5925 .mode = 0644,
5926 .proc_handler = proc_dointvec_jiffies,
5927 },
Neil Hormanfa03ef32007-01-30 14:30:10 -08005928#ifdef CONFIG_IPV6_ROUTE_INFO
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005929 {
5930 .procname = "accept_ra_rt_info_max_plen",
5931 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5932 .maxlen = sizeof(int),
5933 .mode = 0644,
5934 .proc_handler = proc_dointvec,
5935 },
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08005936#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005937#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005938 {
5939 .procname = "proxy_ndp",
5940 .data = &ipv6_devconf.proxy_ndp,
5941 .maxlen = sizeof(int),
5942 .mode = 0644,
5943 .proc_handler = addrconf_sysctl_proxy_ndp,
5944 },
5945 {
5946 .procname = "accept_source_route",
5947 .data = &ipv6_devconf.accept_source_route,
5948 .maxlen = sizeof(int),
5949 .mode = 0644,
5950 .proc_handler = proc_dointvec,
5951 },
Neil Horman95c385b2007-04-25 17:08:10 -07005952#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005953 {
5954 .procname = "optimistic_dad",
5955 .data = &ipv6_devconf.optimistic_dad,
5956 .maxlen = sizeof(int),
5957 .mode = 0644,
5958 .proc_handler = proc_dointvec,
5959 },
5960 {
5961 .procname = "use_optimistic",
5962 .data = &ipv6_devconf.use_optimistic,
5963 .maxlen = sizeof(int),
5964 .mode = 0644,
5965 .proc_handler = proc_dointvec,
5966 },
Neil Horman95c385b2007-04-25 17:08:10 -07005967#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09005968#ifdef CONFIG_IPV6_MROUTE
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005969 {
5970 .procname = "mc_forwarding",
5971 .data = &ipv6_devconf.mc_forwarding,
5972 .maxlen = sizeof(int),
5973 .mode = 0444,
5974 .proc_handler = proc_dointvec,
5975 },
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09005976#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005977 {
5978 .procname = "disable_ipv6",
5979 .data = &ipv6_devconf.disable_ipv6,
5980 .maxlen = sizeof(int),
5981 .mode = 0644,
5982 .proc_handler = addrconf_sysctl_disable,
5983 },
5984 {
5985 .procname = "accept_dad",
5986 .data = &ipv6_devconf.accept_dad,
5987 .maxlen = sizeof(int),
5988 .mode = 0644,
5989 .proc_handler = proc_dointvec,
5990 },
5991 {
5992 .procname = "force_tllao",
5993 .data = &ipv6_devconf.force_tllao,
5994 .maxlen = sizeof(int),
5995 .mode = 0644,
5996 .proc_handler = proc_dointvec
5997 },
5998 {
5999 .procname = "ndisc_notify",
6000 .data = &ipv6_devconf.ndisc_notify,
6001 .maxlen = sizeof(int),
6002 .mode = 0644,
6003 .proc_handler = proc_dointvec
6004 },
6005 {
6006 .procname = "suppress_frag_ndisc",
6007 .data = &ipv6_devconf.suppress_frag_ndisc,
6008 .maxlen = sizeof(int),
6009 .mode = 0644,
6010 .proc_handler = proc_dointvec
6011 },
6012 {
6013 .procname = "accept_ra_from_local",
6014 .data = &ipv6_devconf.accept_ra_from_local,
6015 .maxlen = sizeof(int),
6016 .mode = 0644,
6017 .proc_handler = proc_dointvec,
6018 },
6019 {
6020 .procname = "accept_ra_mtu",
6021 .data = &ipv6_devconf.accept_ra_mtu,
6022 .maxlen = sizeof(int),
6023 .mode = 0644,
6024 .proc_handler = proc_dointvec,
6025 },
6026 {
6027 .procname = "stable_secret",
6028 .data = &ipv6_devconf.stable_secret,
6029 .maxlen = IPV6_MAX_STRLEN,
6030 .mode = 0600,
6031 .proc_handler = addrconf_sysctl_stable_secret,
6032 },
6033 {
6034 .procname = "use_oif_addrs_only",
6035 .data = &ipv6_devconf.use_oif_addrs_only,
6036 .maxlen = sizeof(int),
6037 .mode = 0644,
6038 .proc_handler = proc_dointvec,
6039 },
6040 {
6041 .procname = "ignore_routes_with_linkdown",
6042 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6043 .maxlen = sizeof(int),
6044 .mode = 0644,
6045 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6046 },
6047 {
6048 .procname = "drop_unicast_in_l2_multicast",
6049 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6050 .maxlen = sizeof(int),
6051 .mode = 0644,
6052 .proc_handler = proc_dointvec,
6053 },
6054 {
6055 .procname = "drop_unsolicited_na",
6056 .data = &ipv6_devconf.drop_unsolicited_na,
6057 .maxlen = sizeof(int),
6058 .mode = 0644,
6059 .proc_handler = proc_dointvec,
6060 },
6061 {
6062 .procname = "keep_addr_on_down",
6063 .data = &ipv6_devconf.keep_addr_on_down,
6064 .maxlen = sizeof(int),
6065 .mode = 0644,
6066 .proc_handler = proc_dointvec,
David Ahernf1705ec2016-02-24 09:25:37 -08006067
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006068 },
6069 {
David Lebrun1ababeb2016-11-08 14:57:39 +01006070 .procname = "seg6_enabled",
6071 .data = &ipv6_devconf.seg6_enabled,
6072 .maxlen = sizeof(int),
6073 .mode = 0644,
6074 .proc_handler = proc_dointvec,
6075 },
David Lebrunbf355b82016-11-08 14:57:42 +01006076#ifdef CONFIG_IPV6_SEG6_HMAC
6077 {
6078 .procname = "seg6_require_hmac",
6079 .data = &ipv6_devconf.seg6_require_hmac,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = proc_dointvec,
6083 },
6084#endif
David Lebrun1ababeb2016-11-08 14:57:39 +01006085 {
Erik Nordmarkadc176c2016-12-02 14:00:08 -08006086 .procname = "enhanced_dad",
6087 .data = &ipv6_devconf.enhanced_dad,
6088 .maxlen = sizeof(int),
6089 .mode = 0644,
6090 .proc_handler = proc_dointvec,
6091 },
6092 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006093 /* sentinel */
6094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006095};
6096
Pavel Emelyanovbff16c22008-01-10 17:42:13 -08006097static int __addrconf_sysctl_register(struct net *net, char *dev_name,
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006098 struct inet6_dev *idev, struct ipv6_devconf *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006099{
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006100 int i, ifindex;
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006101 struct ctl_table *table;
Eric W. Biederman6105e292012-04-19 13:41:24 +00006102 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
Pavel Emelyanov1dab6222007-12-02 00:59:38 +11006103
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006104 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6105 if (!table)
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006106 goto out;
6107
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006108 for (i = 0; table[i].data; i++) {
6109 table[i].data += (char *)p - (char *)&ipv6_devconf;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07006110 /* If one of these is already set, then it is not safe to
6111 * overwrite either of them: this makes proc_dointvec_minmax
6112 * usable.
6113 */
6114 if (!table[i].extra1 && !table[i].extra2) {
6115 table[i].extra1 = idev; /* embedded; no ref */
6116 table[i].extra2 = net;
6117 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006118 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006119
Eric W. Biederman6105e292012-04-19 13:41:24 +00006120 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006121
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006122 p->sysctl_header = register_net_sysctl(net, path, table);
6123 if (!p->sysctl_header)
Eric W. Biederman6105e292012-04-19 13:41:24 +00006124 goto free;
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006125
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006126 if (!strcmp(dev_name, "all"))
6127 ifindex = NETCONFA_IFINDEX_ALL;
6128 else if (!strcmp(dev_name, "default"))
6129 ifindex = NETCONFA_IFINDEX_DEFAULT;
6130 else
6131 ifindex = idev->dev->ifindex;
6132 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
Pavel Emelyanov95897312008-01-10 17:41:45 -08006133 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006134
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006135free:
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006136 kfree(table);
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006137out:
Pavel Emelyanov95897312008-01-10 17:41:45 -08006138 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006139}
6140
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006141static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6142{
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006143 struct ctl_table *table;
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006144
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006145 if (!p->sysctl_header)
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006146 return;
6147
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006148 table = p->sysctl_header->ctl_table_arg;
6149 unregister_net_sysctl_table(p->sysctl_header);
6150 p->sysctl_header = NULL;
6151 kfree(table);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006152}
6153
WANG Conga317a2f2014-07-25 15:25:09 -07006154static int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006155{
WANG Conga317a2f2014-07-25 15:25:09 -07006156 int err;
6157
6158 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6159 return -EINVAL;
6160
6161 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6162 &ndisc_ifinfo_sysctl_change);
6163 if (err)
6164 return err;
6165 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6166 idev, &idev->cnf);
6167 if (err)
6168 neigh_sysctl_unregister(idev->nd_parms);
6169
6170 return err;
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006171}
6172
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006173static void addrconf_sysctl_unregister(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006174{
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006175 __addrconf_sysctl_unregister(&idev->cnf);
6176 neigh_sysctl_unregister(idev->nd_parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006177}
6178
6179
6180#endif
6181
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006182static int __net_init addrconf_init_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006183{
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006184 int err = -ENOMEM;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006185 struct ipv6_devconf *all, *dflt;
6186
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006187 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006188 if (!all)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006189 goto err_alloc_all;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006190
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006191 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006192 if (!dflt)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006193 goto err_alloc_dflt;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006194
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006195 /* these will be inherited by all namespaces */
6196 dflt->autoconf = ipv6_defaults.autoconf;
6197 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006198
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01006199 dflt->stable_secret.initialized = false;
6200 all->stable_secret.initialized = false;
6201
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006202 net->ipv6.devconf_all = all;
6203 net->ipv6.devconf_dflt = dflt;
6204
6205#ifdef CONFIG_SYSCTL
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006206 err = __addrconf_sysctl_register(net, "all", NULL, all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006207 if (err < 0)
6208 goto err_reg_all;
6209
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006210 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006211 if (err < 0)
6212 goto err_reg_dflt;
6213#endif
6214 return 0;
6215
6216#ifdef CONFIG_SYSCTL
6217err_reg_dflt:
6218 __addrconf_sysctl_unregister(all);
6219err_reg_all:
6220 kfree(dflt);
6221#endif
6222err_alloc_dflt:
6223 kfree(all);
6224err_alloc_all:
6225 return err;
6226}
6227
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006228static void __net_exit addrconf_exit_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006229{
6230#ifdef CONFIG_SYSCTL
6231 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6232 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6233#endif
zhuyj73cf0e92014-11-26 10:25:58 +08006234 kfree(net->ipv6.devconf_dflt);
6235 kfree(net->ipv6.devconf_all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006236}
6237
6238static struct pernet_operations addrconf_ops = {
6239 .init = addrconf_init_net,
6240 .exit = addrconf_exit_net,
6241};
6242
Daniel Borkmann207895f2015-01-29 12:15:03 +01006243static struct rtnl_af_ops inet6_ops __read_mostly = {
Thomas Grafb382b192010-11-16 04:33:57 +00006244 .family = AF_INET6,
6245 .fill_link_af = inet6_fill_link_af,
6246 .get_link_af_size = inet6_get_link_af_size,
Daniel Borkmann11b1f822015-02-05 14:39:11 +01006247 .validate_link_af = inet6_validate_link_af,
Daniel Borkmannf53adae2013-04-08 04:01:30 +00006248 .set_link_af = inet6_set_link_af,
Thomas Grafb382b192010-11-16 04:33:57 +00006249};
6250
Linus Torvalds1da177e2005-04-16 15:20:36 -07006251/*
6252 * Init / cleanup code
6253 */
6254
6255int __init addrconf_init(void)
6256{
WANG Conga317a2f2014-07-25 15:25:09 -07006257 struct inet6_dev *idev;
stephen hemmingerc2e21292010-03-17 20:31:10 +00006258 int i, err;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006259
Stephen Hemmingere21e8462010-03-20 16:09:01 -07006260 err = ipv6_addr_label_init();
6261 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00006262 pr_crit("%s: cannot initialize default policy table: %d\n",
6263 __func__, err);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006264 goto out;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006266
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006267 err = register_pernet_subsys(&addrconf_ops);
6268 if (err < 0)
6269 goto out_addrlabel;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006270
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006271 addrconf_wq = create_workqueue("ipv6_addrconf");
6272 if (!addrconf_wq) {
6273 err = -ENOMEM;
6274 goto out_nowq;
6275 }
6276
Linus Torvalds1da177e2005-04-16 15:20:36 -07006277 /* The addrconf netdev notifier requires that loopback_dev
6278 * has it's ipv6 private information allocated and setup
6279 * before it can bring up and give link-local addresses
6280 * to other devices which are up.
6281 *
6282 * Unfortunately, loopback_dev is not necessarily the first
6283 * entry in the global dev_base list of net devices. In fact,
6284 * it is likely to be the very last entry on that list.
6285 * So this causes the notifier registry below to try and
6286 * give link-local addresses to all devices besides loopback_dev
6287 * first, then loopback_dev, which cases all the non-loopback_dev
6288 * devices to fail to get a link-local address.
6289 *
6290 * So, as a temporary fix, allocate the ipv6 structure for
6291 * loopback_dev first by hand.
6292 * Longer term, all of the dependencies ipv6 has upon the loopback
6293 * device and it being up should be removed.
6294 */
6295 rtnl_lock();
WANG Conga317a2f2014-07-25 15:25:09 -07006296 idev = ipv6_add_dev(init_net.loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006297 rtnl_unlock();
WANG Conga317a2f2014-07-25 15:25:09 -07006298 if (IS_ERR(idev)) {
6299 err = PTR_ERR(idev);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006300 goto errlo;
WANG Conga317a2f2014-07-25 15:25:09 -07006301 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006302
stephen hemmingerc2e21292010-03-17 20:31:10 +00006303 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6304 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6305
Linus Torvalds1da177e2005-04-16 15:20:36 -07006306 register_netdevice_notifier(&ipv6_dev_notf);
6307
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006308 addrconf_verify();
Thomas Grafc127ea22007-03-22 11:58:32 -07006309
stephen hemminger3678a9d2013-12-30 10:41:32 -08006310 rtnl_af_register(&inet6_ops);
Thomas Grafb382b192010-11-16 04:33:57 +00006311
Greg Rosec7ac8672011-06-10 01:27:09 +00006312 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6313 NULL);
Thomas Grafc127ea22007-03-22 11:58:32 -07006314 if (err < 0)
6315 goto errout;
6316
6317 /* Only the first call to __rtnl_register can fail */
Greg Rosec7ac8672011-06-10 01:27:09 +00006318 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6319 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6320 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6321 inet6_dump_ifaddr, NULL);
6322 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6323 inet6_dump_ifmcaddr, NULL);
6324 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6325 inet6_dump_ifacaddr, NULL);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +00006326 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
Nicolas Dichtel7a674202013-03-05 23:42:06 +00006327 inet6_netconf_dump_devconf, NULL);
Thomas Grafc127ea22007-03-22 11:58:32 -07006328
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006329 ipv6_addr_label_rtnl_register();
6330
Linus Torvalds1da177e2005-04-16 15:20:36 -07006331 return 0;
Thomas Grafc127ea22007-03-22 11:58:32 -07006332errout:
Thomas Grafb382b192010-11-16 04:33:57 +00006333 rtnl_af_unregister(&inet6_ops);
Thomas Grafc127ea22007-03-22 11:58:32 -07006334 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006335errlo:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006336 destroy_workqueue(addrconf_wq);
6337out_nowq:
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006338 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006339out_addrlabel:
6340 ipv6_addr_label_cleanup();
6341out:
Thomas Grafc127ea22007-03-22 11:58:32 -07006342 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006343}
6344
Daniel Lezcano09f77092007-12-13 05:34:58 -08006345void addrconf_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006346{
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006347 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006348 int i;
6349
6350 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006351 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006352 ipv6_addr_label_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006353
6354 rtnl_lock();
6355
Thomas Grafb382b192010-11-16 04:33:57 +00006356 __rtnl_af_unregister(&inet6_ops);
6357
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006358 /* clean dev list */
6359 for_each_netdev(&init_net, dev) {
6360 if (__in6_dev_get(dev) == NULL)
6361 continue;
6362 addrconf_ifdown(dev, 1);
6363 }
6364 addrconf_ifdown(init_net.loopback_dev, 2);
6365
Linus Torvalds1da177e2005-04-16 15:20:36 -07006366 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006367 * Check hash table.
6368 */
stephen hemminger5c578aed2010-03-17 20:31:11 +00006369 spin_lock_bh(&addrconf_hash_lock);
stephen hemmingerc2e21292010-03-17 20:31:10 +00006370 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6371 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
stephen hemminger5c578aed2010-03-17 20:31:11 +00006372 spin_unlock_bh(&addrconf_hash_lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006373 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006374 rtnl_unlock();
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006375
6376 destroy_workqueue(addrconf_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006377}