]>
Commit | Line | Data |
---|---|---|
2a8cc6c8 YH |
1 | /* |
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
2a8cc6c8 YH |
17 | #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 | */ | |
31 | struct ip6addrlbl_entry | |
32 | { | |
3de23255 BT |
33 | #ifdef CONFIG_NET_NS |
34 | struct net *lbl_net; | |
35 | #endif | |
2a8cc6c8 YH |
36 | 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 | ||
46 | static struct ip6addrlbl_table | |
47 | { | |
48 | struct hlist_head head; | |
49 | spinlock_t lock; | |
50 | u32 seq; | |
51 | } ip6addrlbl_table; | |
52 | ||
3de23255 BT |
53 | static inline |
54 | struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl) | |
55 | { | |
c2d9ba9b | 56 | return read_pnet(&lbl->lbl_net); |
3de23255 BT |
57 | } |
58 | ||
2a8cc6c8 YH |
59 | /* |
60 | * Default policy table (RFC3484 + extensions) | |
61 | * | |
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) | |
5fe47b8a | 71 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) |
2a8cc6c8 YH |
72 | * |
73 | * Note: 0xffffffff is used if we do not have any policies. | |
74 | */ | |
75 | ||
76 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
77 | ||
3de23255 | 78 | static const __net_initdata struct ip6addrlbl_init_table |
2a8cc6c8 YH |
79 | { |
80 | const struct in6_addr *prefix; | |
81 | int prefixlen; | |
82 | u32 label; | |
83 | } ip6addrlbl_init_table[] = { | |
84 | { /* ::/0 */ | |
85 | .prefix = &in6addr_any, | |
86 | .label = 1, | |
87 | },{ /* fc00::/7 */ | |
88 | .prefix = &(struct in6_addr){{{ 0xfc }}}, | |
89 | .prefixlen = 7, | |
90 | .label = 5, | |
91 | },{ /* 2002::/16 */ | |
92 | .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}}, | |
93 | .prefixlen = 16, | |
94 | .label = 2, | |
95 | },{ /* 2001::/32 */ | |
96 | .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}}, | |
97 | .prefixlen = 32, | |
98 | .label = 6, | |
5fe47b8a JMT |
99 | },{ /* 2001:10::/28 */ |
100 | .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}}, | |
101 | .prefixlen = 28, | |
102 | .label = 7, | |
2a8cc6c8 YH |
103 | },{ /* ::ffff:0:0 */ |
104 | .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}}, | |
105 | .prefixlen = 96, | |
106 | .label = 4, | |
107 | },{ /* ::/96 */ | |
108 | .prefix = &in6addr_any, | |
109 | .prefixlen = 96, | |
110 | .label = 3, | |
111 | },{ /* ::1/128 */ | |
112 | .prefix = &in6addr_loopback, | |
113 | .prefixlen = 128, | |
114 | .label = 0, | |
115 | } | |
116 | }; | |
117 | ||
118 | /* Object management */ | |
119 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) | |
120 | { | |
3de23255 BT |
121 | #ifdef CONFIG_NET_NS |
122 | release_net(p->lbl_net); | |
123 | #endif | |
2a8cc6c8 YH |
124 | kfree(p); |
125 | } | |
126 | ||
85040bcb YH |
127 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
128 | { | |
129 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
130 | } | |
131 | ||
2a8cc6c8 YH |
132 | static inline int ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
133 | { | |
134 | return atomic_inc_not_zero(&p->refcnt); | |
135 | } | |
136 | ||
137 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) | |
138 | { | |
139 | if (atomic_dec_and_test(&p->refcnt)) | |
85040bcb | 140 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
2a8cc6c8 YH |
141 | } |
142 | ||
143 | /* Find label */ | |
3de23255 BT |
144 | static int __ip6addrlbl_match(struct net *net, |
145 | struct ip6addrlbl_entry *p, | |
2a8cc6c8 YH |
146 | const struct in6_addr *addr, |
147 | int addrtype, int ifindex) | |
148 | { | |
3de23255 BT |
149 | if (!net_eq(ip6addrlbl_net(p), net)) |
150 | return 0; | |
2a8cc6c8 YH |
151 | if (p->ifindex && p->ifindex != ifindex) |
152 | return 0; | |
153 | if (p->addrtype && p->addrtype != addrtype) | |
154 | return 0; | |
155 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) | |
156 | return 0; | |
157 | return 1; | |
158 | } | |
159 | ||
3de23255 BT |
160 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, |
161 | const struct in6_addr *addr, | |
2a8cc6c8 YH |
162 | int type, int ifindex) |
163 | { | |
164 | struct hlist_node *pos; | |
165 | struct ip6addrlbl_entry *p; | |
166 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 | 167 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
2a8cc6c8 YH |
168 | return p; |
169 | } | |
170 | return NULL; | |
171 | } | |
172 | ||
3de23255 BT |
173 | u32 ipv6_addr_label(struct net *net, |
174 | const struct in6_addr *addr, int type, int ifindex) | |
2a8cc6c8 YH |
175 | { |
176 | u32 label; | |
177 | struct ip6addrlbl_entry *p; | |
178 | ||
179 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; | |
180 | ||
181 | rcu_read_lock(); | |
3de23255 | 182 | p = __ipv6_addr_label(net, addr, type, ifindex); |
2a8cc6c8 YH |
183 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
184 | rcu_read_unlock(); | |
185 | ||
5b095d98 | 186 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", |
0c6ce78a | 187 | __func__, addr, type, ifindex, label); |
2a8cc6c8 YH |
188 | |
189 | return label; | |
190 | } | |
191 | ||
192 | /* allocate one entry */ | |
3de23255 BT |
193 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
194 | const struct in6_addr *prefix, | |
40fee36e YH |
195 | int prefixlen, int ifindex, |
196 | u32 label) | |
2a8cc6c8 YH |
197 | { |
198 | struct ip6addrlbl_entry *newp; | |
199 | int addrtype; | |
200 | ||
5b095d98 | 201 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", |
0c6ce78a | 202 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); |
2a8cc6c8 YH |
203 | |
204 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); | |
205 | ||
206 | switch (addrtype) { | |
207 | case IPV6_ADDR_MAPPED: | |
208 | if (prefixlen > 96) | |
209 | return ERR_PTR(-EINVAL); | |
210 | if (prefixlen < 96) | |
211 | addrtype = 0; | |
212 | break; | |
213 | case IPV6_ADDR_COMPATv4: | |
214 | if (prefixlen != 96) | |
215 | addrtype = 0; | |
216 | break; | |
217 | case IPV6_ADDR_LOOPBACK: | |
218 | if (prefixlen != 128) | |
219 | addrtype = 0; | |
220 | break; | |
221 | } | |
222 | ||
223 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); | |
224 | if (!newp) | |
225 | return ERR_PTR(-ENOMEM); | |
226 | ||
227 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); | |
228 | newp->prefixlen = prefixlen; | |
229 | newp->ifindex = ifindex; | |
230 | newp->addrtype = addrtype; | |
231 | newp->label = label; | |
232 | INIT_HLIST_NODE(&newp->list); | |
3de23255 BT |
233 | #ifdef CONFIG_NET_NS |
234 | newp->lbl_net = hold_net(net); | |
235 | #endif | |
2a8cc6c8 YH |
236 | atomic_set(&newp->refcnt, 1); |
237 | return newp; | |
238 | } | |
239 | ||
240 | /* add a label */ | |
40fee36e | 241 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
2a8cc6c8 YH |
242 | { |
243 | int ret = 0; | |
244 | ||
245 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", | |
0dc47877 | 246 | __func__, |
2a8cc6c8 YH |
247 | newp, replace); |
248 | ||
249 | if (hlist_empty(&ip6addrlbl_table.head)) { | |
250 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
251 | } else { | |
252 | struct hlist_node *pos, *n; | |
253 | struct ip6addrlbl_entry *p = NULL; | |
254 | hlist_for_each_entry_safe(p, pos, n, | |
255 | &ip6addrlbl_table.head, list) { | |
256 | if (p->prefixlen == newp->prefixlen && | |
3de23255 | 257 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && |
2a8cc6c8 YH |
258 | p->ifindex == newp->ifindex && |
259 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { | |
260 | if (!replace) { | |
261 | ret = -EEXIST; | |
262 | goto out; | |
263 | } | |
264 | hlist_replace_rcu(&p->list, &newp->list); | |
265 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
266 | goto out; |
267 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || | |
268 | (p->prefixlen < newp->prefixlen)) { | |
269 | hlist_add_before_rcu(&newp->list, &p->list); | |
270 | goto out; | |
271 | } | |
272 | } | |
273 | hlist_add_after_rcu(&p->list, &newp->list); | |
274 | } | |
275 | out: | |
276 | if (!ret) | |
277 | ip6addrlbl_table.seq++; | |
278 | return ret; | |
279 | } | |
280 | ||
281 | /* add a label */ | |
3de23255 BT |
282 | static int ip6addrlbl_add(struct net *net, |
283 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 284 | int ifindex, u32 label, int replace) |
2a8cc6c8 YH |
285 | { |
286 | struct ip6addrlbl_entry *newp; | |
287 | int ret = 0; | |
288 | ||
5b095d98 | 289 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
0c6ce78a HH |
290 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, |
291 | replace); | |
2a8cc6c8 | 292 | |
3de23255 | 293 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); |
2a8cc6c8 YH |
294 | if (IS_ERR(newp)) |
295 | return PTR_ERR(newp); | |
296 | spin_lock(&ip6addrlbl_table.lock); | |
297 | ret = __ip6addrlbl_add(newp, replace); | |
298 | spin_unlock(&ip6addrlbl_table.lock); | |
299 | if (ret) | |
300 | ip6addrlbl_free(newp); | |
301 | return ret; | |
302 | } | |
303 | ||
304 | /* remove a label */ | |
3de23255 BT |
305 | static int __ip6addrlbl_del(struct net *net, |
306 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 307 | int ifindex) |
2a8cc6c8 YH |
308 | { |
309 | struct ip6addrlbl_entry *p = NULL; | |
310 | struct hlist_node *pos, *n; | |
311 | int ret = -ESRCH; | |
312 | ||
5b095d98 | 313 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 314 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
315 | |
316 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
317 | if (p->prefixlen == prefixlen && | |
3de23255 | 318 | net_eq(ip6addrlbl_net(p), net) && |
2a8cc6c8 YH |
319 | p->ifindex == ifindex && |
320 | ipv6_addr_equal(&p->prefix, prefix)) { | |
321 | hlist_del_rcu(&p->list); | |
322 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
323 | ret = 0; |
324 | break; | |
325 | } | |
326 | } | |
327 | return ret; | |
328 | } | |
329 | ||
3de23255 BT |
330 | static int ip6addrlbl_del(struct net *net, |
331 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 332 | int ifindex) |
2a8cc6c8 YH |
333 | { |
334 | struct in6_addr prefix_buf; | |
335 | int ret; | |
336 | ||
5b095d98 | 337 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 338 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
339 | |
340 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
341 | spin_lock(&ip6addrlbl_table.lock); | |
3de23255 | 342 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
2a8cc6c8 YH |
343 | spin_unlock(&ip6addrlbl_table.lock); |
344 | return ret; | |
345 | } | |
346 | ||
347 | /* add default label */ | |
3de23255 | 348 | static int __net_init ip6addrlbl_net_init(struct net *net) |
2a8cc6c8 YH |
349 | { |
350 | int err = 0; | |
351 | int i; | |
352 | ||
0dc47877 | 353 | ADDRLABEL(KERN_DEBUG "%s()\n", __func__); |
2a8cc6c8 YH |
354 | |
355 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
3de23255 BT |
356 | int ret = ip6addrlbl_add(net, |
357 | ip6addrlbl_init_table[i].prefix, | |
2a8cc6c8 YH |
358 | ip6addrlbl_init_table[i].prefixlen, |
359 | 0, | |
360 | ip6addrlbl_init_table[i].label, 0); | |
361 | /* XXX: should we free all rules when we catch an error? */ | |
362 | if (ret && (!err || err != -ENOMEM)) | |
363 | err = ret; | |
364 | } | |
365 | return err; | |
366 | } | |
367 | ||
3de23255 BT |
368 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
369 | { | |
370 | struct ip6addrlbl_entry *p = NULL; | |
371 | struct hlist_node *pos, *n; | |
372 | ||
373 | /* Remove all labels belonging to the exiting net */ | |
374 | spin_lock(&ip6addrlbl_table.lock); | |
375 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
376 | if (net_eq(ip6addrlbl_net(p), net)) { | |
377 | hlist_del_rcu(&p->list); | |
378 | ip6addrlbl_put(p); | |
379 | } | |
380 | } | |
381 | spin_unlock(&ip6addrlbl_table.lock); | |
382 | } | |
383 | ||
384 | static struct pernet_operations ipv6_addr_label_ops = { | |
385 | .init = ip6addrlbl_net_init, | |
386 | .exit = ip6addrlbl_net_exit, | |
387 | }; | |
388 | ||
2a8cc6c8 YH |
389 | int __init ipv6_addr_label_init(void) |
390 | { | |
391 | spin_lock_init(&ip6addrlbl_table.lock); | |
392 | ||
3de23255 | 393 | return register_pernet_subsys(&ipv6_addr_label_ops); |
2a8cc6c8 YH |
394 | } |
395 | ||
396 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { | |
397 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, | |
398 | [IFAL_LABEL] = { .len = sizeof(u32), }, | |
399 | }; | |
400 | ||
401 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, | |
402 | void *arg) | |
403 | { | |
3b1e0a65 | 404 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
405 | struct ifaddrlblmsg *ifal; |
406 | struct nlattr *tb[IFAL_MAX+1]; | |
407 | struct in6_addr *pfx; | |
408 | u32 label; | |
409 | int err = 0; | |
410 | ||
411 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
412 | if (err < 0) | |
413 | return err; | |
414 | ||
415 | ifal = nlmsg_data(nlh); | |
416 | ||
417 | if (ifal->ifal_family != AF_INET6 || | |
418 | ifal->ifal_prefixlen > 128) | |
419 | return -EINVAL; | |
420 | ||
2a8cc6c8 YH |
421 | if (!tb[IFAL_ADDRESS]) |
422 | return -EINVAL; | |
423 | ||
424 | pfx = nla_data(tb[IFAL_ADDRESS]); | |
425 | if (!pfx) | |
426 | return -EINVAL; | |
427 | ||
428 | if (!tb[IFAL_LABEL]) | |
429 | return -EINVAL; | |
430 | label = nla_get_u32(tb[IFAL_LABEL]); | |
431 | if (label == IPV6_ADDR_LABEL_DEFAULT) | |
432 | return -EINVAL; | |
433 | ||
434 | switch(nlh->nlmsg_type) { | |
435 | case RTM_NEWADDRLABEL: | |
0771275b FW |
436 | if (ifal->ifal_index && |
437 | !__dev_get_by_index(net, ifal->ifal_index)) | |
438 | return -EINVAL; | |
439 | ||
3de23255 | 440 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
441 | ifal->ifal_index, label, |
442 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
443 | break; | |
444 | case RTM_DELADDRLABEL: | |
3de23255 | 445 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
446 | ifal->ifal_index); |
447 | break; | |
448 | default: | |
449 | err = -EOPNOTSUPP; | |
450 | } | |
451 | return err; | |
452 | } | |
453 | ||
454 | static inline void ip6addrlbl_putmsg(struct nlmsghdr *nlh, | |
455 | int prefixlen, int ifindex, u32 lseq) | |
456 | { | |
457 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); | |
458 | ifal->ifal_family = AF_INET6; | |
459 | ifal->ifal_prefixlen = prefixlen; | |
460 | ifal->ifal_flags = 0; | |
461 | ifal->ifal_index = ifindex; | |
462 | ifal->ifal_seq = lseq; | |
463 | }; | |
464 | ||
465 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
466 | struct ip6addrlbl_entry *p, | |
467 | u32 lseq, | |
468 | u32 pid, u32 seq, int event, | |
469 | unsigned int flags) | |
470 | { | |
471 | struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, event, | |
472 | sizeof(struct ifaddrlblmsg), flags); | |
473 | if (!nlh) | |
474 | return -EMSGSIZE; | |
475 | ||
476 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
477 | ||
478 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || | |
479 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
480 | nlmsg_cancel(skb, nlh); | |
481 | return -EMSGSIZE; | |
482 | } | |
483 | ||
484 | return nlmsg_end(skb, nlh); | |
485 | } | |
486 | ||
487 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
488 | { | |
3b1e0a65 | 489 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
490 | struct ip6addrlbl_entry *p; |
491 | struct hlist_node *pos; | |
492 | int idx = 0, s_idx = cb->args[0]; | |
493 | int err; | |
494 | ||
495 | rcu_read_lock(); | |
496 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 BT |
497 | if (idx >= s_idx && |
498 | net_eq(ip6addrlbl_net(p), net)) { | |
2a8cc6c8 YH |
499 | if ((err = ip6addrlbl_fill(skb, p, |
500 | ip6addrlbl_table.seq, | |
501 | NETLINK_CB(cb->skb).pid, | |
502 | cb->nlh->nlmsg_seq, | |
503 | RTM_NEWADDRLABEL, | |
504 | NLM_F_MULTI)) <= 0) | |
505 | break; | |
506 | } | |
507 | idx++; | |
508 | } | |
509 | rcu_read_unlock(); | |
510 | cb->args[0] = idx; | |
511 | return skb->len; | |
512 | } | |
513 | ||
514 | static inline int ip6addrlbl_msgsize(void) | |
515 | { | |
516 | return (NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) | |
517 | + nla_total_size(16) /* IFAL_ADDRESS */ | |
518 | + nla_total_size(4) /* IFAL_LABEL */ | |
519 | ); | |
520 | } | |
521 | ||
522 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh, | |
523 | void *arg) | |
524 | { | |
3b1e0a65 | 525 | struct net *net = sock_net(in_skb->sk); |
2a8cc6c8 YH |
526 | struct ifaddrlblmsg *ifal; |
527 | struct nlattr *tb[IFAL_MAX+1]; | |
528 | struct in6_addr *addr; | |
529 | u32 lseq; | |
530 | int err = 0; | |
531 | struct ip6addrlbl_entry *p; | |
532 | struct sk_buff *skb; | |
533 | ||
534 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
535 | if (err < 0) | |
536 | return err; | |
537 | ||
538 | ifal = nlmsg_data(nlh); | |
539 | ||
540 | if (ifal->ifal_family != AF_INET6 || | |
541 | ifal->ifal_prefixlen != 128) | |
542 | return -EINVAL; | |
543 | ||
544 | if (ifal->ifal_index && | |
3de23255 | 545 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
546 | return -EINVAL; |
547 | ||
548 | if (!tb[IFAL_ADDRESS]) | |
549 | return -EINVAL; | |
550 | ||
551 | addr = nla_data(tb[IFAL_ADDRESS]); | |
552 | if (!addr) | |
553 | return -EINVAL; | |
554 | ||
555 | rcu_read_lock(); | |
3de23255 | 556 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
2a8cc6c8 YH |
557 | if (p && ip6addrlbl_hold(p)) |
558 | p = NULL; | |
559 | lseq = ip6addrlbl_table.seq; | |
560 | rcu_read_unlock(); | |
561 | ||
562 | if (!p) { | |
563 | err = -ESRCH; | |
564 | goto out; | |
565 | } | |
566 | ||
567 | if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) { | |
568 | ip6addrlbl_put(p); | |
569 | return -ENOBUFS; | |
570 | } | |
571 | ||
572 | err = ip6addrlbl_fill(skb, p, lseq, | |
573 | NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, | |
574 | RTM_NEWADDRLABEL, 0); | |
575 | ||
576 | ip6addrlbl_put(p); | |
577 | ||
578 | if (err < 0) { | |
579 | WARN_ON(err == -EMSGSIZE); | |
580 | kfree_skb(skb); | |
581 | goto out; | |
582 | } | |
583 | ||
3de23255 | 584 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
2a8cc6c8 YH |
585 | out: |
586 | return err; | |
587 | } | |
588 | ||
589 | void __init ipv6_addr_label_rtnl_register(void) | |
590 | { | |
591 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, NULL); | |
592 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, NULL); | |
593 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, ip6addrlbl_dump); | |
594 | } | |
595 |