blob: 882124ebb438bd033765c4284ddf7ada9834d39d [file] [log] [blame]
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09001/*
2 * IPv6 Address Label subsystem
3 * for the IPv6 "Default" Source Address Selection
4 *
5 * Copyright (C)2007 USAGI/WIDE Project
6 */
7/*
8 * Author:
Wang Yufen1c8669e2014-02-17 16:53:34 +08009 * YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090010 */
11
12#include <linux/kernel.h>
13#include <linux/list.h>
14#include <linux/rcupdate.h>
15#include <linux/in6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090017#include <net/addrconf.h>
18#include <linux/if_addrlabel.h>
19#include <linux/netlink.h>
20#include <linux/rtnetlink.h>
21
22#if 0
23#define ADDRLABEL(x...) printk(x)
24#else
Wang Yufen1c8669e2014-02-17 16:53:34 +080025#define ADDRLABEL(x...) do { ; } while (0)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090026#endif
27
28/*
29 * Policy Table
30 */
Wang Yufen22b285d2014-02-17 16:53:33 +080031struct ip6addrlbl_entry {
Eric W. Biederman0c5c9fb2015-03-11 23:06:44 -050032 possible_net_t lbl_net;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090033 struct in6_addr prefix;
34 int prefixlen;
35 int ifindex;
36 int addrtype;
37 u32 label;
38 struct hlist_node list;
39 atomic_t refcnt;
40 struct rcu_head rcu;
41};
42
43static struct ip6addrlbl_table
44{
45 struct hlist_head head;
46 spinlock_t lock;
47 u32 seq;
48} ip6addrlbl_table;
49
Benjamin Thery3de23252008-05-28 14:51:24 +020050static inline
51struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
52{
Eric Dumazetc2d9ba92010-06-01 06:51:19 +000053 return read_pnet(&lbl->lbl_net);
Benjamin Thery3de23252008-05-28 14:51:24 +020054}
55
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090056/*
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000057 * Default policy table (RFC6724 + extensions)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090058 *
59 * prefix addr_type label
60 * -------------------------------------------------------------------------
61 * ::1/128 LOOPBACK 0
62 * ::/0 N/A 1
63 * 2002::/16 N/A 2
64 * ::/96 COMPATv4 3
65 * ::ffff:0:0/96 V4MAPPED 4
66 * fc00::/7 N/A 5 ULA (RFC 4193)
67 * 2001::/32 N/A 6 Teredo (RFC 4380)
Juha-Matti Tapio5fe47b82008-02-28 20:55:02 -080068 * 2001:10::/28 N/A 7 ORCHID (RFC 4843)
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000069 * fec0::/10 N/A 11 Site-local
70 * (deprecated by RFC3879)
71 * 3ffe::/16 N/A 12 6bone
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090072 *
73 * Note: 0xffffffff is used if we do not have any policies.
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000074 * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090075 */
76
77#define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
78
Andi Kleen04a6f822012-10-04 17:12:11 -070079static const __net_initconst struct ip6addrlbl_init_table
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090080{
81 const struct in6_addr *prefix;
82 int prefixlen;
83 u32 label;
84} ip6addrlbl_init_table[] = {
85 { /* ::/0 */
86 .prefix = &in6addr_any,
87 .label = 1,
Wang Yufen1c8669e2014-02-17 16:53:34 +080088 }, { /* fc00::/7 */
89 .prefix = &(struct in6_addr){ { { 0xfc } } } ,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090090 .prefixlen = 7,
91 .label = 5,
Wang Yufen1c8669e2014-02-17 16:53:34 +080092 }, { /* fec0::/10 */
93 .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000094 .prefixlen = 10,
95 .label = 11,
Wang Yufen1c8669e2014-02-17 16:53:34 +080096 }, { /* 2002::/16 */
97 .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090098 .prefixlen = 16,
99 .label = 2,
Wang Yufen1c8669e2014-02-17 16:53:34 +0800100 }, { /* 3ffe::/16 */
101 .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +0000102 .prefixlen = 16,
103 .label = 12,
Wang Yufen1c8669e2014-02-17 16:53:34 +0800104 }, { /* 2001::/32 */
105 .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900106 .prefixlen = 32,
107 .label = 6,
Wang Yufen1c8669e2014-02-17 16:53:34 +0800108 }, { /* 2001:10::/28 */
109 .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
Juha-Matti Tapio5fe47b82008-02-28 20:55:02 -0800110 .prefixlen = 28,
111 .label = 7,
Wang Yufen1c8669e2014-02-17 16:53:34 +0800112 }, { /* ::ffff:0:0 */
113 .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900114 .prefixlen = 96,
115 .label = 4,
Wang Yufen1c8669e2014-02-17 16:53:34 +0800116 }, { /* ::/96 */
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900117 .prefix = &in6addr_any,
118 .prefixlen = 96,
119 .label = 3,
Wang Yufen1c8669e2014-02-17 16:53:34 +0800120 }, { /* ::1/128 */
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900121 .prefix = &in6addr_loopback,
122 .prefixlen = 128,
123 .label = 0,
124 }
125};
126
127/* Object management */
128static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p)
129{
130 kfree(p);
131}
132
YOSHIFUJI Hideaki85040bc2008-01-28 15:46:02 -0800133static void ip6addrlbl_free_rcu(struct rcu_head *h)
134{
135 ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu));
136}
137
Eric Dumazeta50feda2012-05-18 18:57:34 +0000138static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900139{
140 return atomic_inc_not_zero(&p->refcnt);
141}
142
143static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p)
144{
145 if (atomic_dec_and_test(&p->refcnt))
YOSHIFUJI Hideaki85040bc2008-01-28 15:46:02 -0800146 call_rcu(&p->rcu, ip6addrlbl_free_rcu);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900147}
148
149/* Find label */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000150static bool __ip6addrlbl_match(struct net *net,
151 const struct ip6addrlbl_entry *p,
152 const struct in6_addr *addr,
153 int addrtype, int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900154{
Benjamin Thery3de23252008-05-28 14:51:24 +0200155 if (!net_eq(ip6addrlbl_net(p), net))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000156 return false;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900157 if (p->ifindex && p->ifindex != ifindex)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000158 return false;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900159 if (p->addrtype && p->addrtype != addrtype)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000160 return false;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900161 if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000162 return false;
163 return true;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900164}
165
Benjamin Thery3de23252008-05-28 14:51:24 +0200166static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
167 const struct in6_addr *addr,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900168 int type, int ifindex)
169{
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900170 struct ip6addrlbl_entry *p;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800171 hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200172 if (__ip6addrlbl_match(net, p, addr, type, ifindex))
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900173 return p;
174 }
175 return NULL;
176}
177
Benjamin Thery3de23252008-05-28 14:51:24 +0200178u32 ipv6_addr_label(struct net *net,
179 const struct in6_addr *addr, int type, int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900180{
181 u32 label;
182 struct ip6addrlbl_entry *p;
183
184 type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
185
186 rcu_read_lock();
Benjamin Thery3de23252008-05-28 14:51:24 +0200187 p = __ipv6_addr_label(net, addr, type, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900188 label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
189 rcu_read_unlock();
190
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700191 ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700192 __func__, addr, type, ifindex, label);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900193
194 return label;
195}
196
197/* allocate one entry */
Benjamin Thery3de23252008-05-28 14:51:24 +0200198static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
199 const struct in6_addr *prefix,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900200 int prefixlen, int ifindex,
201 u32 label)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900202{
203 struct ip6addrlbl_entry *newp;
204 int addrtype;
205
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700206 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700207 __func__, prefix, prefixlen, ifindex, (unsigned int)label);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900208
209 addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);
210
211 switch (addrtype) {
212 case IPV6_ADDR_MAPPED:
213 if (prefixlen > 96)
214 return ERR_PTR(-EINVAL);
215 if (prefixlen < 96)
216 addrtype = 0;
217 break;
218 case IPV6_ADDR_COMPATv4:
219 if (prefixlen != 96)
220 addrtype = 0;
221 break;
222 case IPV6_ADDR_LOOPBACK:
223 if (prefixlen != 128)
224 addrtype = 0;
225 break;
226 }
227
228 newp = kmalloc(sizeof(*newp), GFP_KERNEL);
229 if (!newp)
230 return ERR_PTR(-ENOMEM);
231
232 ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
233 newp->prefixlen = prefixlen;
234 newp->ifindex = ifindex;
235 newp->addrtype = addrtype;
236 newp->label = label;
237 INIT_HLIST_NODE(&newp->list);
Eric W. Biederman0c5c9fb2015-03-11 23:06:44 -0500238 write_pnet(&newp->lbl_net, net);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900239 atomic_set(&newp->refcnt, 1);
240 return newp;
241}
242
243/* add a label */
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900244static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900245{
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200246 struct hlist_node *n;
247 struct ip6addrlbl_entry *last = NULL, *p = NULL;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900248 int ret = 0;
249
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200250 ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
251 replace);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900252
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200253 hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
254 if (p->prefixlen == newp->prefixlen &&
255 net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) &&
256 p->ifindex == newp->ifindex &&
257 ipv6_addr_equal(&p->prefix, &newp->prefix)) {
258 if (!replace) {
259 ret = -EEXIST;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900260 goto out;
261 }
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200262 hlist_replace_rcu(&p->list, &newp->list);
263 ip6addrlbl_put(p);
264 goto out;
265 } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
266 (p->prefixlen < newp->prefixlen)) {
267 hlist_add_before_rcu(&newp->list, &p->list);
268 goto out;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900269 }
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200270 last = p;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900271 }
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200272 if (last)
Ken Helias1d023282014-08-06 16:09:16 -0700273 hlist_add_behind_rcu(&newp->list, &last->list);
Hannes Frederic Sowa639739b2013-09-03 02:13:31 +0200274 else
275 hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900276out:
277 if (!ret)
278 ip6addrlbl_table.seq++;
279 return ret;
280}
281
282/* add a label */
Benjamin Thery3de23252008-05-28 14:51:24 +0200283static int ip6addrlbl_add(struct net *net,
284 const struct in6_addr *prefix, int prefixlen,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900285 int ifindex, u32 label, int replace)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900286{
287 struct ip6addrlbl_entry *newp;
288 int ret = 0;
289
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700290 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700291 __func__, prefix, prefixlen, ifindex, (unsigned int)label,
292 replace);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900293
Benjamin Thery3de23252008-05-28 14:51:24 +0200294 newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900295 if (IS_ERR(newp))
296 return PTR_ERR(newp);
297 spin_lock(&ip6addrlbl_table.lock);
298 ret = __ip6addrlbl_add(newp, replace);
299 spin_unlock(&ip6addrlbl_table.lock);
300 if (ret)
301 ip6addrlbl_free(newp);
302 return ret;
303}
304
305/* remove a label */
Benjamin Thery3de23252008-05-28 14:51:24 +0200306static int __ip6addrlbl_del(struct net *net,
307 const struct in6_addr *prefix, int prefixlen,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900308 int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900309{
310 struct ip6addrlbl_entry *p = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800311 struct hlist_node *n;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900312 int ret = -ESRCH;
313
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700314 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700315 __func__, prefix, prefixlen, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900316
Sasha Levinb67bfe02013-02-27 17:06:00 -0800317 hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900318 if (p->prefixlen == prefixlen &&
Benjamin Thery3de23252008-05-28 14:51:24 +0200319 net_eq(ip6addrlbl_net(p), net) &&
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900320 p->ifindex == ifindex &&
321 ipv6_addr_equal(&p->prefix, prefix)) {
322 hlist_del_rcu(&p->list);
323 ip6addrlbl_put(p);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900324 ret = 0;
325 break;
326 }
327 }
328 return ret;
329}
330
Benjamin Thery3de23252008-05-28 14:51:24 +0200331static int ip6addrlbl_del(struct net *net,
332 const struct in6_addr *prefix, int prefixlen,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900333 int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900334{
335 struct in6_addr prefix_buf;
336 int ret;
337
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700338 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700339 __func__, prefix, prefixlen, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900340
341 ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
342 spin_lock(&ip6addrlbl_table.lock);
Benjamin Thery3de23252008-05-28 14:51:24 +0200343 ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900344 spin_unlock(&ip6addrlbl_table.lock);
345 return ret;
346}
347
348/* add default label */
Benjamin Thery3de23252008-05-28 14:51:24 +0200349static int __net_init ip6addrlbl_net_init(struct net *net)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900350{
351 int err = 0;
352 int i;
353
Joe Perchesf3213832012-05-15 14:11:53 +0000354 ADDRLABEL(KERN_DEBUG "%s\n", __func__);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900355
356 for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200357 int ret = ip6addrlbl_add(net,
358 ip6addrlbl_init_table[i].prefix,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900359 ip6addrlbl_init_table[i].prefixlen,
360 0,
361 ip6addrlbl_init_table[i].label, 0);
362 /* XXX: should we free all rules when we catch an error? */
363 if (ret && (!err || err != -ENOMEM))
364 err = ret;
365 }
366 return err;
367}
368
Benjamin Thery3de23252008-05-28 14:51:24 +0200369static void __net_exit ip6addrlbl_net_exit(struct net *net)
370{
371 struct ip6addrlbl_entry *p = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800372 struct hlist_node *n;
Benjamin Thery3de23252008-05-28 14:51:24 +0200373
374 /* Remove all labels belonging to the exiting net */
375 spin_lock(&ip6addrlbl_table.lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800376 hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200377 if (net_eq(ip6addrlbl_net(p), net)) {
378 hlist_del_rcu(&p->list);
379 ip6addrlbl_put(p);
380 }
381 }
382 spin_unlock(&ip6addrlbl_table.lock);
383}
384
385static struct pernet_operations ipv6_addr_label_ops = {
386 .init = ip6addrlbl_net_init,
387 .exit = ip6addrlbl_net_exit,
388};
389
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900390int __init ipv6_addr_label_init(void)
391{
392 spin_lock_init(&ip6addrlbl_table.lock);
393
Benjamin Thery3de23252008-05-28 14:51:24 +0200394 return register_pernet_subsys(&ipv6_addr_label_ops);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900395}
396
Neil Horman2cc6d2b2010-09-24 09:55:52 +0000397void ipv6_addr_label_cleanup(void)
398{
399 unregister_pernet_subsys(&ipv6_addr_label_ops);
400}
401
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900402static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
403 [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), },
404 [IFAL_LABEL] = { .len = sizeof(u32), },
405};
406
Thomas Graf661d2962013-03-21 07:45:29 +0000407static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900408{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900409 struct net *net = sock_net(skb->sk);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900410 struct ifaddrlblmsg *ifal;
411 struct nlattr *tb[IFAL_MAX+1];
412 struct in6_addr *pfx;
413 u32 label;
414 int err = 0;
415
416 err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
417 if (err < 0)
418 return err;
419
420 ifal = nlmsg_data(nlh);
421
422 if (ifal->ifal_family != AF_INET6 ||
423 ifal->ifal_prefixlen > 128)
424 return -EINVAL;
425
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900426 if (!tb[IFAL_ADDRESS])
427 return -EINVAL;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900428 pfx = nla_data(tb[IFAL_ADDRESS]);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900429
430 if (!tb[IFAL_LABEL])
431 return -EINVAL;
432 label = nla_get_u32(tb[IFAL_LABEL]);
433 if (label == IPV6_ADDR_LABEL_DEFAULT)
434 return -EINVAL;
435
Wang Yufen1c8669e2014-02-17 16:53:34 +0800436 switch (nlh->nlmsg_type) {
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900437 case RTM_NEWADDRLABEL:
Florian Westphal07712752010-05-07 11:31:33 +0000438 if (ifal->ifal_index &&
439 !__dev_get_by_index(net, ifal->ifal_index))
440 return -EINVAL;
441
Benjamin Thery3de23252008-05-28 14:51:24 +0200442 err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900443 ifal->ifal_index, label,
444 nlh->nlmsg_flags & NLM_F_REPLACE);
445 break;
446 case RTM_DELADDRLABEL:
Benjamin Thery3de23252008-05-28 14:51:24 +0200447 err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900448 ifal->ifal_index);
449 break;
450 default:
451 err = -EOPNOTSUPP;
452 }
453 return err;
454}
455
Eric Dumazeta50feda2012-05-18 18:57:34 +0000456static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
457 int prefixlen, int ifindex, u32 lseq)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900458{
459 struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
460 ifal->ifal_family = AF_INET6;
461 ifal->ifal_prefixlen = prefixlen;
462 ifal->ifal_flags = 0;
463 ifal->ifal_index = ifindex;
464 ifal->ifal_seq = lseq;
465};
466
467static int ip6addrlbl_fill(struct sk_buff *skb,
468 struct ip6addrlbl_entry *p,
469 u32 lseq,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000470 u32 portid, u32 seq, int event,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900471 unsigned int flags)
472{
Eric W. Biederman15e47302012-09-07 20:12:54 +0000473 struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900474 sizeof(struct ifaddrlblmsg), flags);
475 if (!nlh)
476 return -EMSGSIZE;
477
478 ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
479
Jiri Benc930345e2015-03-29 16:59:25 +0200480 if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 ||
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900481 nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
482 nlmsg_cancel(skb, nlh);
483 return -EMSGSIZE;
484 }
485
Johannes Berg053c0952015-01-16 22:09:00 +0100486 nlmsg_end(skb, nlh);
487 return 0;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900488}
489
490static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
491{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900492 struct net *net = sock_net(skb->sk);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900493 struct ip6addrlbl_entry *p;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900494 int idx = 0, s_idx = cb->args[0];
495 int err;
496
497 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -0800498 hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200499 if (idx >= s_idx &&
500 net_eq(ip6addrlbl_net(p), net)) {
Wang Yufencb6e9262014-02-17 16:53:35 +0800501 err = ip6addrlbl_fill(skb, p,
502 ip6addrlbl_table.seq,
503 NETLINK_CB(cb->skb).portid,
504 cb->nlh->nlmsg_seq,
505 RTM_NEWADDRLABEL,
506 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +0100507 if (err < 0)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900508 break;
509 }
510 idx++;
511 }
512 rcu_read_unlock();
513 cb->args[0] = idx;
514 return skb->len;
515}
516
517static inline int ip6addrlbl_msgsize(void)
518{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000519 return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900520 + nla_total_size(16) /* IFAL_ADDRESS */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000521 + nla_total_size(4); /* IFAL_LABEL */
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900522}
523
Wang Yufen22b285d2014-02-17 16:53:33 +0800524static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900525{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900526 struct net *net = sock_net(in_skb->sk);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900527 struct ifaddrlblmsg *ifal;
528 struct nlattr *tb[IFAL_MAX+1];
529 struct in6_addr *addr;
530 u32 lseq;
531 int err = 0;
532 struct ip6addrlbl_entry *p;
533 struct sk_buff *skb;
534
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900535 err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
536 if (err < 0)
537 return err;
538
539 ifal = nlmsg_data(nlh);
540
541 if (ifal->ifal_family != AF_INET6 ||
542 ifal->ifal_prefixlen != 128)
543 return -EINVAL;
544
545 if (ifal->ifal_index &&
Benjamin Thery3de23252008-05-28 14:51:24 +0200546 !__dev_get_by_index(net, ifal->ifal_index))
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900547 return -EINVAL;
548
549 if (!tb[IFAL_ADDRESS])
550 return -EINVAL;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900551 addr = nla_data(tb[IFAL_ADDRESS]);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900552
553 rcu_read_lock();
Benjamin Thery3de23252008-05-28 14:51:24 +0200554 p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900555 if (p && ip6addrlbl_hold(p))
556 p = NULL;
557 lseq = ip6addrlbl_table.seq;
558 rcu_read_unlock();
559
560 if (!p) {
561 err = -ESRCH;
562 goto out;
563 }
564
Wang Yufencb6e9262014-02-17 16:53:35 +0800565 skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL);
566 if (!skb) {
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900567 ip6addrlbl_put(p);
568 return -ENOBUFS;
569 }
570
571 err = ip6addrlbl_fill(skb, p, lseq,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000572 NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900573 RTM_NEWADDRLABEL, 0);
574
575 ip6addrlbl_put(p);
576
577 if (err < 0) {
578 WARN_ON(err == -EMSGSIZE);
579 kfree_skb(skb);
580 goto out;
581 }
582
Eric W. Biederman15e47302012-09-07 20:12:54 +0000583 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900584out:
585 return err;
586}
587
588void __init ipv6_addr_label_rtnl_register(void)
589{
Greg Rosec7ac8672011-06-10 01:27:09 +0000590 __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel,
591 NULL, NULL);
592 __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel,
593 NULL, NULL);
594 __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get,
595 ip6addrlbl_dump, NULL);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900596}
597