blob: ff76eecfd622ed80115fe691f9901739e7c7c0da [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:
9 * YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
10 */
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
25#define ADDRLABEL(x...) do { ; } while(0)
26#endif
27
28/*
29 * Policy Table
30 */
31struct ip6addrlbl_entry
32{
Benjamin Thery3de23252008-05-28 14:51:24 +020033#ifdef CONFIG_NET_NS
34 struct net *lbl_net;
35#endif
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090036 struct in6_addr prefix;
37 int prefixlen;
38 int ifindex;
39 int addrtype;
40 u32 label;
41 struct hlist_node list;
42 atomic_t refcnt;
43 struct rcu_head rcu;
44};
45
46static struct ip6addrlbl_table
47{
48 struct hlist_head head;
49 spinlock_t lock;
50 u32 seq;
51} ip6addrlbl_table;
52
Benjamin Thery3de23252008-05-28 14:51:24 +020053static inline
54struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
55{
Eric Dumazetc2d9ba92010-06-01 06:51:19 +000056 return read_pnet(&lbl->lbl_net);
Benjamin Thery3de23252008-05-28 14:51:24 +020057}
58
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090059/*
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000060 * Default policy table (RFC6724 + extensions)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090061 *
62 * prefix addr_type label
63 * -------------------------------------------------------------------------
64 * ::1/128 LOOPBACK 0
65 * ::/0 N/A 1
66 * 2002::/16 N/A 2
67 * ::/96 COMPATv4 3
68 * ::ffff:0:0/96 V4MAPPED 4
69 * fc00::/7 N/A 5 ULA (RFC 4193)
70 * 2001::/32 N/A 6 Teredo (RFC 4380)
Juha-Matti Tapio5fe47b82008-02-28 20:55:02 -080071 * 2001:10::/28 N/A 7 ORCHID (RFC 4843)
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000072 * fec0::/10 N/A 11 Site-local
73 * (deprecated by RFC3879)
74 * 3ffe::/16 N/A 12 6bone
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090075 *
76 * Note: 0xffffffff is used if we do not have any policies.
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000077 * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090078 */
79
80#define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
81
Andi Kleen04a6f822012-10-04 17:12:11 -070082static const __net_initconst struct ip6addrlbl_init_table
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090083{
84 const struct in6_addr *prefix;
85 int prefixlen;
86 u32 label;
87} ip6addrlbl_init_table[] = {
88 { /* ::/0 */
89 .prefix = &in6addr_any,
90 .label = 1,
91 },{ /* fc00::/7 */
92 .prefix = &(struct in6_addr){{{ 0xfc }}},
93 .prefixlen = 7,
94 .label = 5,
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +000095 },{ /* fec0::/10 */
96 .prefix = &(struct in6_addr){{{ 0xfe, 0xc0 }}},
97 .prefixlen = 10,
98 .label = 11,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +090099 },{ /* 2002::/16 */
100 .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}},
101 .prefixlen = 16,
102 .label = 2,
YOSHIFUJI Hideaki / 吉藤英明417962a2012-09-10 18:16:49 +0000103 },{ /* 3ffe::/16 */
104 .prefix = &(struct in6_addr){{{ 0x3f, 0xfe }}},
105 .prefixlen = 16,
106 .label = 12,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900107 },{ /* 2001::/32 */
108 .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}},
109 .prefixlen = 32,
110 .label = 6,
Juha-Matti Tapio5fe47b82008-02-28 20:55:02 -0800111 },{ /* 2001:10::/28 */
112 .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}},
113 .prefixlen = 28,
114 .label = 7,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900115 },{ /* ::ffff:0:0 */
116 .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}},
117 .prefixlen = 96,
118 .label = 4,
119 },{ /* ::/96 */
120 .prefix = &in6addr_any,
121 .prefixlen = 96,
122 .label = 3,
123 },{ /* ::1/128 */
124 .prefix = &in6addr_loopback,
125 .prefixlen = 128,
126 .label = 0,
127 }
128};
129
130/* Object management */
131static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p)
132{
Benjamin Thery3de23252008-05-28 14:51:24 +0200133#ifdef CONFIG_NET_NS
134 release_net(p->lbl_net);
135#endif
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900136 kfree(p);
137}
138
YOSHIFUJI Hideaki85040bc2008-01-28 15:46:02 -0800139static void ip6addrlbl_free_rcu(struct rcu_head *h)
140{
141 ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu));
142}
143
Eric Dumazeta50feda2012-05-18 18:57:34 +0000144static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900145{
146 return atomic_inc_not_zero(&p->refcnt);
147}
148
149static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p)
150{
151 if (atomic_dec_and_test(&p->refcnt))
YOSHIFUJI Hideaki85040bc2008-01-28 15:46:02 -0800152 call_rcu(&p->rcu, ip6addrlbl_free_rcu);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900153}
154
155/* Find label */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000156static bool __ip6addrlbl_match(struct net *net,
157 const struct ip6addrlbl_entry *p,
158 const struct in6_addr *addr,
159 int addrtype, int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900160{
Benjamin Thery3de23252008-05-28 14:51:24 +0200161 if (!net_eq(ip6addrlbl_net(p), net))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000162 return false;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900163 if (p->ifindex && p->ifindex != ifindex)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000164 return false;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900165 if (p->addrtype && p->addrtype != addrtype)
Eric Dumazeta50feda2012-05-18 18:57:34 +0000166 return false;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900167 if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
Eric Dumazeta50feda2012-05-18 18:57:34 +0000168 return false;
169 return true;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900170}
171
Benjamin Thery3de23252008-05-28 14:51:24 +0200172static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
173 const struct in6_addr *addr,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900174 int type, int ifindex)
175{
176 struct hlist_node *pos;
177 struct ip6addrlbl_entry *p;
178 hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200179 if (__ip6addrlbl_match(net, p, addr, type, ifindex))
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900180 return p;
181 }
182 return NULL;
183}
184
Benjamin Thery3de23252008-05-28 14:51:24 +0200185u32 ipv6_addr_label(struct net *net,
186 const struct in6_addr *addr, int type, int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900187{
188 u32 label;
189 struct ip6addrlbl_entry *p;
190
191 type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
192
193 rcu_read_lock();
Benjamin Thery3de23252008-05-28 14:51:24 +0200194 p = __ipv6_addr_label(net, addr, type, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900195 label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
196 rcu_read_unlock();
197
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700198 ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700199 __func__, addr, type, ifindex, label);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900200
201 return label;
202}
203
204/* allocate one entry */
Benjamin Thery3de23252008-05-28 14:51:24 +0200205static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
206 const struct in6_addr *prefix,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900207 int prefixlen, int ifindex,
208 u32 label)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900209{
210 struct ip6addrlbl_entry *newp;
211 int addrtype;
212
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700213 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700214 __func__, prefix, prefixlen, ifindex, (unsigned int)label);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900215
216 addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);
217
218 switch (addrtype) {
219 case IPV6_ADDR_MAPPED:
220 if (prefixlen > 96)
221 return ERR_PTR(-EINVAL);
222 if (prefixlen < 96)
223 addrtype = 0;
224 break;
225 case IPV6_ADDR_COMPATv4:
226 if (prefixlen != 96)
227 addrtype = 0;
228 break;
229 case IPV6_ADDR_LOOPBACK:
230 if (prefixlen != 128)
231 addrtype = 0;
232 break;
233 }
234
235 newp = kmalloc(sizeof(*newp), GFP_KERNEL);
236 if (!newp)
237 return ERR_PTR(-ENOMEM);
238
239 ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
240 newp->prefixlen = prefixlen;
241 newp->ifindex = ifindex;
242 newp->addrtype = addrtype;
243 newp->label = label;
244 INIT_HLIST_NODE(&newp->list);
Benjamin Thery3de23252008-05-28 14:51:24 +0200245#ifdef CONFIG_NET_NS
246 newp->lbl_net = hold_net(net);
247#endif
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900248 atomic_set(&newp->refcnt, 1);
249 return newp;
250}
251
252/* add a label */
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900253static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900254{
255 int ret = 0;
256
257 ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800258 __func__,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900259 newp, replace);
260
261 if (hlist_empty(&ip6addrlbl_table.head)) {
262 hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head);
263 } else {
264 struct hlist_node *pos, *n;
265 struct ip6addrlbl_entry *p = NULL;
266 hlist_for_each_entry_safe(p, pos, n,
267 &ip6addrlbl_table.head, list) {
268 if (p->prefixlen == newp->prefixlen &&
Benjamin Thery3de23252008-05-28 14:51:24 +0200269 net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) &&
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900270 p->ifindex == newp->ifindex &&
271 ipv6_addr_equal(&p->prefix, &newp->prefix)) {
272 if (!replace) {
273 ret = -EEXIST;
274 goto out;
275 }
276 hlist_replace_rcu(&p->list, &newp->list);
277 ip6addrlbl_put(p);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900278 goto out;
279 } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
280 (p->prefixlen < newp->prefixlen)) {
281 hlist_add_before_rcu(&newp->list, &p->list);
282 goto out;
283 }
284 }
285 hlist_add_after_rcu(&p->list, &newp->list);
286 }
287out:
288 if (!ret)
289 ip6addrlbl_table.seq++;
290 return ret;
291}
292
293/* add a label */
Benjamin Thery3de23252008-05-28 14:51:24 +0200294static int ip6addrlbl_add(struct net *net,
295 const struct in6_addr *prefix, int prefixlen,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900296 int ifindex, u32 label, int replace)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900297{
298 struct ip6addrlbl_entry *newp;
299 int ret = 0;
300
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700301 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700302 __func__, prefix, prefixlen, ifindex, (unsigned int)label,
303 replace);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900304
Benjamin Thery3de23252008-05-28 14:51:24 +0200305 newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900306 if (IS_ERR(newp))
307 return PTR_ERR(newp);
308 spin_lock(&ip6addrlbl_table.lock);
309 ret = __ip6addrlbl_add(newp, replace);
310 spin_unlock(&ip6addrlbl_table.lock);
311 if (ret)
312 ip6addrlbl_free(newp);
313 return ret;
314}
315
316/* remove a label */
Benjamin Thery3de23252008-05-28 14:51:24 +0200317static int __ip6addrlbl_del(struct net *net,
318 const struct in6_addr *prefix, int prefixlen,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900319 int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900320{
321 struct ip6addrlbl_entry *p = NULL;
322 struct hlist_node *pos, *n;
323 int ret = -ESRCH;
324
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700325 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700326 __func__, prefix, prefixlen, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900327
328 hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) {
329 if (p->prefixlen == prefixlen &&
Benjamin Thery3de23252008-05-28 14:51:24 +0200330 net_eq(ip6addrlbl_net(p), net) &&
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900331 p->ifindex == ifindex &&
332 ipv6_addr_equal(&p->prefix, prefix)) {
333 hlist_del_rcu(&p->list);
334 ip6addrlbl_put(p);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900335 ret = 0;
336 break;
337 }
338 }
339 return ret;
340}
341
Benjamin Thery3de23252008-05-28 14:51:24 +0200342static int ip6addrlbl_del(struct net *net,
343 const struct in6_addr *prefix, int prefixlen,
YOSHIFUJI Hideaki40fee362008-01-22 17:12:50 +0900344 int ifindex)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900345{
346 struct in6_addr prefix_buf;
347 int ret;
348
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700349 ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
Harvey Harrison0c6ce782008-10-28 16:09:23 -0700350 __func__, prefix, prefixlen, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900351
352 ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
353 spin_lock(&ip6addrlbl_table.lock);
Benjamin Thery3de23252008-05-28 14:51:24 +0200354 ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900355 spin_unlock(&ip6addrlbl_table.lock);
356 return ret;
357}
358
359/* add default label */
Benjamin Thery3de23252008-05-28 14:51:24 +0200360static int __net_init ip6addrlbl_net_init(struct net *net)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900361{
362 int err = 0;
363 int i;
364
Joe Perchesf3213832012-05-15 14:11:53 +0000365 ADDRLABEL(KERN_DEBUG "%s\n", __func__);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900366
367 for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200368 int ret = ip6addrlbl_add(net,
369 ip6addrlbl_init_table[i].prefix,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900370 ip6addrlbl_init_table[i].prefixlen,
371 0,
372 ip6addrlbl_init_table[i].label, 0);
373 /* XXX: should we free all rules when we catch an error? */
374 if (ret && (!err || err != -ENOMEM))
375 err = ret;
376 }
377 return err;
378}
379
Benjamin Thery3de23252008-05-28 14:51:24 +0200380static void __net_exit ip6addrlbl_net_exit(struct net *net)
381{
382 struct ip6addrlbl_entry *p = NULL;
383 struct hlist_node *pos, *n;
384
385 /* Remove all labels belonging to the exiting net */
386 spin_lock(&ip6addrlbl_table.lock);
387 hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) {
388 if (net_eq(ip6addrlbl_net(p), net)) {
389 hlist_del_rcu(&p->list);
390 ip6addrlbl_put(p);
391 }
392 }
393 spin_unlock(&ip6addrlbl_table.lock);
394}
395
396static struct pernet_operations ipv6_addr_label_ops = {
397 .init = ip6addrlbl_net_init,
398 .exit = ip6addrlbl_net_exit,
399};
400
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900401int __init ipv6_addr_label_init(void)
402{
403 spin_lock_init(&ip6addrlbl_table.lock);
404
Benjamin Thery3de23252008-05-28 14:51:24 +0200405 return register_pernet_subsys(&ipv6_addr_label_ops);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900406}
407
Neil Horman2cc6d2b2010-09-24 09:55:52 +0000408void ipv6_addr_label_cleanup(void)
409{
410 unregister_pernet_subsys(&ipv6_addr_label_ops);
411}
412
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900413static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
414 [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), },
415 [IFAL_LABEL] = { .len = sizeof(u32), },
416};
417
418static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
419 void *arg)
420{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900421 struct net *net = sock_net(skb->sk);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900422 struct ifaddrlblmsg *ifal;
423 struct nlattr *tb[IFAL_MAX+1];
424 struct in6_addr *pfx;
425 u32 label;
426 int err = 0;
427
428 err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
429 if (err < 0)
430 return err;
431
432 ifal = nlmsg_data(nlh);
433
434 if (ifal->ifal_family != AF_INET6 ||
435 ifal->ifal_prefixlen > 128)
436 return -EINVAL;
437
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900438 if (!tb[IFAL_ADDRESS])
439 return -EINVAL;
440
441 pfx = nla_data(tb[IFAL_ADDRESS]);
442 if (!pfx)
443 return -EINVAL;
444
445 if (!tb[IFAL_LABEL])
446 return -EINVAL;
447 label = nla_get_u32(tb[IFAL_LABEL]);
448 if (label == IPV6_ADDR_LABEL_DEFAULT)
449 return -EINVAL;
450
451 switch(nlh->nlmsg_type) {
452 case RTM_NEWADDRLABEL:
Florian Westphal07712752010-05-07 11:31:33 +0000453 if (ifal->ifal_index &&
454 !__dev_get_by_index(net, ifal->ifal_index))
455 return -EINVAL;
456
Benjamin Thery3de23252008-05-28 14:51:24 +0200457 err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900458 ifal->ifal_index, label,
459 nlh->nlmsg_flags & NLM_F_REPLACE);
460 break;
461 case RTM_DELADDRLABEL:
Benjamin Thery3de23252008-05-28 14:51:24 +0200462 err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900463 ifal->ifal_index);
464 break;
465 default:
466 err = -EOPNOTSUPP;
467 }
468 return err;
469}
470
Eric Dumazeta50feda2012-05-18 18:57:34 +0000471static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
472 int prefixlen, int ifindex, u32 lseq)
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900473{
474 struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
475 ifal->ifal_family = AF_INET6;
476 ifal->ifal_prefixlen = prefixlen;
477 ifal->ifal_flags = 0;
478 ifal->ifal_index = ifindex;
479 ifal->ifal_seq = lseq;
480};
481
482static int ip6addrlbl_fill(struct sk_buff *skb,
483 struct ip6addrlbl_entry *p,
484 u32 lseq,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000485 u32 portid, u32 seq, int event,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900486 unsigned int flags)
487{
Eric W. Biederman15e47302012-09-07 20:12:54 +0000488 struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900489 sizeof(struct ifaddrlblmsg), flags);
490 if (!nlh)
491 return -EMSGSIZE;
492
493 ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
494
495 if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 ||
496 nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
497 nlmsg_cancel(skb, nlh);
498 return -EMSGSIZE;
499 }
500
501 return nlmsg_end(skb, nlh);
502}
503
504static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
505{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900506 struct net *net = sock_net(skb->sk);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900507 struct ip6addrlbl_entry *p;
508 struct hlist_node *pos;
509 int idx = 0, s_idx = cb->args[0];
510 int err;
511
512 rcu_read_lock();
513 hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) {
Benjamin Thery3de23252008-05-28 14:51:24 +0200514 if (idx >= s_idx &&
515 net_eq(ip6addrlbl_net(p), net)) {
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900516 if ((err = ip6addrlbl_fill(skb, p,
517 ip6addrlbl_table.seq,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000518 NETLINK_CB(cb->skb).portid,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900519 cb->nlh->nlmsg_seq,
520 RTM_NEWADDRLABEL,
521 NLM_F_MULTI)) <= 0)
522 break;
523 }
524 idx++;
525 }
526 rcu_read_unlock();
527 cb->args[0] = idx;
528 return skb->len;
529}
530
531static inline int ip6addrlbl_msgsize(void)
532{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000533 return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900534 + nla_total_size(16) /* IFAL_ADDRESS */
Eric Dumazeta02cec22010-09-22 20:43:57 +0000535 + nla_total_size(4); /* IFAL_LABEL */
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900536}
537
538static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
539 void *arg)
540{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900541 struct net *net = sock_net(in_skb->sk);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900542 struct ifaddrlblmsg *ifal;
543 struct nlattr *tb[IFAL_MAX+1];
544 struct in6_addr *addr;
545 u32 lseq;
546 int err = 0;
547 struct ip6addrlbl_entry *p;
548 struct sk_buff *skb;
549
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900550 err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
551 if (err < 0)
552 return err;
553
554 ifal = nlmsg_data(nlh);
555
556 if (ifal->ifal_family != AF_INET6 ||
557 ifal->ifal_prefixlen != 128)
558 return -EINVAL;
559
560 if (ifal->ifal_index &&
Benjamin Thery3de23252008-05-28 14:51:24 +0200561 !__dev_get_by_index(net, ifal->ifal_index))
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900562 return -EINVAL;
563
564 if (!tb[IFAL_ADDRESS])
565 return -EINVAL;
566
567 addr = nla_data(tb[IFAL_ADDRESS]);
568 if (!addr)
569 return -EINVAL;
570
571 rcu_read_lock();
Benjamin Thery3de23252008-05-28 14:51:24 +0200572 p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900573 if (p && ip6addrlbl_hold(p))
574 p = NULL;
575 lseq = ip6addrlbl_table.seq;
576 rcu_read_unlock();
577
578 if (!p) {
579 err = -ESRCH;
580 goto out;
581 }
582
583 if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) {
584 ip6addrlbl_put(p);
585 return -ENOBUFS;
586 }
587
588 err = ip6addrlbl_fill(skb, p, lseq,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000589 NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900590 RTM_NEWADDRLABEL, 0);
591
592 ip6addrlbl_put(p);
593
594 if (err < 0) {
595 WARN_ON(err == -EMSGSIZE);
596 kfree_skb(skb);
597 goto out;
598 }
599
Eric W. Biederman15e47302012-09-07 20:12:54 +0000600 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900601out:
602 return err;
603}
604
605void __init ipv6_addr_label_rtnl_register(void)
606{
Greg Rosec7ac8672011-06-10 01:27:09 +0000607 __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel,
608 NULL, NULL);
609 __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel,
610 NULL, NULL);
611 __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get,
612 ip6addrlbl_dump, NULL);
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +0900613}
614