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 | { | |
56 | #ifdef CONFIG_NET_NS | |
57 | return lbl->lbl_net; | |
58 | #else | |
59 | return &init_net; | |
60 | #endif | |
61 | } | |
62 | ||
2a8cc6c8 YH |
63 | /* |
64 | * Default policy table (RFC3484 + extensions) | |
65 | * | |
66 | * prefix addr_type label | |
67 | * ------------------------------------------------------------------------- | |
68 | * ::1/128 LOOPBACK 0 | |
69 | * ::/0 N/A 1 | |
70 | * 2002::/16 N/A 2 | |
71 | * ::/96 COMPATv4 3 | |
72 | * ::ffff:0:0/96 V4MAPPED 4 | |
73 | * fc00::/7 N/A 5 ULA (RFC 4193) | |
74 | * 2001::/32 N/A 6 Teredo (RFC 4380) | |
5fe47b8a | 75 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) |
2a8cc6c8 YH |
76 | * |
77 | * Note: 0xffffffff is used if we do not have any policies. | |
78 | */ | |
79 | ||
80 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
81 | ||
3de23255 | 82 | static const __net_initdata struct ip6addrlbl_init_table |
2a8cc6c8 YH |
83 | { |
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, | |
95 | },{ /* 2002::/16 */ | |
96 | .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}}, | |
97 | .prefixlen = 16, | |
98 | .label = 2, | |
99 | },{ /* 2001::/32 */ | |
100 | .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}}, | |
101 | .prefixlen = 32, | |
102 | .label = 6, | |
5fe47b8a JMT |
103 | },{ /* 2001:10::/28 */ |
104 | .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}}, | |
105 | .prefixlen = 28, | |
106 | .label = 7, | |
2a8cc6c8 YH |
107 | },{ /* ::ffff:0:0 */ |
108 | .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}}, | |
109 | .prefixlen = 96, | |
110 | .label = 4, | |
111 | },{ /* ::/96 */ | |
112 | .prefix = &in6addr_any, | |
113 | .prefixlen = 96, | |
114 | .label = 3, | |
115 | },{ /* ::1/128 */ | |
116 | .prefix = &in6addr_loopback, | |
117 | .prefixlen = 128, | |
118 | .label = 0, | |
119 | } | |
120 | }; | |
121 | ||
122 | /* Object management */ | |
123 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) | |
124 | { | |
3de23255 BT |
125 | #ifdef CONFIG_NET_NS |
126 | release_net(p->lbl_net); | |
127 | #endif | |
2a8cc6c8 YH |
128 | kfree(p); |
129 | } | |
130 | ||
85040bcb YH |
131 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
132 | { | |
133 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
134 | } | |
135 | ||
2a8cc6c8 YH |
136 | static inline int ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
137 | { | |
138 | return atomic_inc_not_zero(&p->refcnt); | |
139 | } | |
140 | ||
141 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) | |
142 | { | |
143 | if (atomic_dec_and_test(&p->refcnt)) | |
85040bcb | 144 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
2a8cc6c8 YH |
145 | } |
146 | ||
147 | /* Find label */ | |
3de23255 BT |
148 | static int __ip6addrlbl_match(struct net *net, |
149 | struct ip6addrlbl_entry *p, | |
2a8cc6c8 YH |
150 | const struct in6_addr *addr, |
151 | int addrtype, int ifindex) | |
152 | { | |
3de23255 BT |
153 | if (!net_eq(ip6addrlbl_net(p), net)) |
154 | return 0; | |
2a8cc6c8 YH |
155 | if (p->ifindex && p->ifindex != ifindex) |
156 | return 0; | |
157 | if (p->addrtype && p->addrtype != addrtype) | |
158 | return 0; | |
159 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) | |
160 | return 0; | |
161 | return 1; | |
162 | } | |
163 | ||
3de23255 BT |
164 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, |
165 | const struct in6_addr *addr, | |
2a8cc6c8 YH |
166 | int type, int ifindex) |
167 | { | |
168 | struct hlist_node *pos; | |
169 | struct ip6addrlbl_entry *p; | |
170 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 | 171 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
2a8cc6c8 YH |
172 | return p; |
173 | } | |
174 | return NULL; | |
175 | } | |
176 | ||
3de23255 BT |
177 | u32 ipv6_addr_label(struct net *net, |
178 | const struct in6_addr *addr, int type, int ifindex) | |
2a8cc6c8 YH |
179 | { |
180 | u32 label; | |
181 | struct ip6addrlbl_entry *p; | |
182 | ||
183 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; | |
184 | ||
185 | rcu_read_lock(); | |
3de23255 | 186 | p = __ipv6_addr_label(net, addr, type, ifindex); |
2a8cc6c8 YH |
187 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
188 | rcu_read_unlock(); | |
189 | ||
5b095d98 | 190 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", |
0c6ce78a | 191 | __func__, addr, type, ifindex, label); |
2a8cc6c8 YH |
192 | |
193 | return label; | |
194 | } | |
195 | ||
196 | /* allocate one entry */ | |
3de23255 BT |
197 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
198 | const struct in6_addr *prefix, | |
40fee36e YH |
199 | int prefixlen, int ifindex, |
200 | u32 label) | |
2a8cc6c8 YH |
201 | { |
202 | struct ip6addrlbl_entry *newp; | |
203 | int addrtype; | |
204 | ||
5b095d98 | 205 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", |
0c6ce78a | 206 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); |
2a8cc6c8 YH |
207 | |
208 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); | |
209 | ||
210 | switch (addrtype) { | |
211 | case IPV6_ADDR_MAPPED: | |
212 | if (prefixlen > 96) | |
213 | return ERR_PTR(-EINVAL); | |
214 | if (prefixlen < 96) | |
215 | addrtype = 0; | |
216 | break; | |
217 | case IPV6_ADDR_COMPATv4: | |
218 | if (prefixlen != 96) | |
219 | addrtype = 0; | |
220 | break; | |
221 | case IPV6_ADDR_LOOPBACK: | |
222 | if (prefixlen != 128) | |
223 | addrtype = 0; | |
224 | break; | |
225 | } | |
226 | ||
227 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); | |
228 | if (!newp) | |
229 | return ERR_PTR(-ENOMEM); | |
230 | ||
231 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); | |
232 | newp->prefixlen = prefixlen; | |
233 | newp->ifindex = ifindex; | |
234 | newp->addrtype = addrtype; | |
235 | newp->label = label; | |
236 | INIT_HLIST_NODE(&newp->list); | |
3de23255 BT |
237 | #ifdef CONFIG_NET_NS |
238 | newp->lbl_net = hold_net(net); | |
239 | #endif | |
2a8cc6c8 YH |
240 | atomic_set(&newp->refcnt, 1); |
241 | return newp; | |
242 | } | |
243 | ||
244 | /* add a label */ | |
40fee36e | 245 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
2a8cc6c8 YH |
246 | { |
247 | int ret = 0; | |
248 | ||
249 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", | |
0dc47877 | 250 | __func__, |
2a8cc6c8 YH |
251 | newp, replace); |
252 | ||
253 | if (hlist_empty(&ip6addrlbl_table.head)) { | |
254 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
255 | } else { | |
256 | struct hlist_node *pos, *n; | |
257 | struct ip6addrlbl_entry *p = NULL; | |
258 | hlist_for_each_entry_safe(p, pos, n, | |
259 | &ip6addrlbl_table.head, list) { | |
260 | if (p->prefixlen == newp->prefixlen && | |
3de23255 | 261 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && |
2a8cc6c8 YH |
262 | p->ifindex == newp->ifindex && |
263 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { | |
264 | if (!replace) { | |
265 | ret = -EEXIST; | |
266 | goto out; | |
267 | } | |
268 | hlist_replace_rcu(&p->list, &newp->list); | |
269 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
270 | goto out; |
271 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || | |
272 | (p->prefixlen < newp->prefixlen)) { | |
273 | hlist_add_before_rcu(&newp->list, &p->list); | |
274 | goto out; | |
275 | } | |
276 | } | |
277 | hlist_add_after_rcu(&p->list, &newp->list); | |
278 | } | |
279 | out: | |
280 | if (!ret) | |
281 | ip6addrlbl_table.seq++; | |
282 | return ret; | |
283 | } | |
284 | ||
285 | /* add a label */ | |
3de23255 BT |
286 | static int ip6addrlbl_add(struct net *net, |
287 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 288 | int ifindex, u32 label, int replace) |
2a8cc6c8 YH |
289 | { |
290 | struct ip6addrlbl_entry *newp; | |
291 | int ret = 0; | |
292 | ||
5b095d98 | 293 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
0c6ce78a HH |
294 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, |
295 | replace); | |
2a8cc6c8 | 296 | |
3de23255 | 297 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); |
2a8cc6c8 YH |
298 | if (IS_ERR(newp)) |
299 | return PTR_ERR(newp); | |
300 | spin_lock(&ip6addrlbl_table.lock); | |
301 | ret = __ip6addrlbl_add(newp, replace); | |
302 | spin_unlock(&ip6addrlbl_table.lock); | |
303 | if (ret) | |
304 | ip6addrlbl_free(newp); | |
305 | return ret; | |
306 | } | |
307 | ||
308 | /* remove a label */ | |
3de23255 BT |
309 | static int __ip6addrlbl_del(struct net *net, |
310 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 311 | int ifindex) |
2a8cc6c8 YH |
312 | { |
313 | struct ip6addrlbl_entry *p = NULL; | |
314 | struct hlist_node *pos, *n; | |
315 | int ret = -ESRCH; | |
316 | ||
5b095d98 | 317 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 318 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
319 | |
320 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
321 | if (p->prefixlen == prefixlen && | |
3de23255 | 322 | net_eq(ip6addrlbl_net(p), net) && |
2a8cc6c8 YH |
323 | p->ifindex == ifindex && |
324 | ipv6_addr_equal(&p->prefix, prefix)) { | |
325 | hlist_del_rcu(&p->list); | |
326 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
327 | ret = 0; |
328 | break; | |
329 | } | |
330 | } | |
331 | return ret; | |
332 | } | |
333 | ||
3de23255 BT |
334 | static int ip6addrlbl_del(struct net *net, |
335 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 336 | int ifindex) |
2a8cc6c8 YH |
337 | { |
338 | struct in6_addr prefix_buf; | |
339 | int ret; | |
340 | ||
5b095d98 | 341 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 342 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
343 | |
344 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
345 | spin_lock(&ip6addrlbl_table.lock); | |
3de23255 | 346 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
2a8cc6c8 YH |
347 | spin_unlock(&ip6addrlbl_table.lock); |
348 | return ret; | |
349 | } | |
350 | ||
351 | /* add default label */ | |
3de23255 | 352 | static int __net_init ip6addrlbl_net_init(struct net *net) |
2a8cc6c8 YH |
353 | { |
354 | int err = 0; | |
355 | int i; | |
356 | ||
0dc47877 | 357 | ADDRLABEL(KERN_DEBUG "%s()\n", __func__); |
2a8cc6c8 YH |
358 | |
359 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
3de23255 BT |
360 | int ret = ip6addrlbl_add(net, |
361 | ip6addrlbl_init_table[i].prefix, | |
2a8cc6c8 YH |
362 | ip6addrlbl_init_table[i].prefixlen, |
363 | 0, | |
364 | ip6addrlbl_init_table[i].label, 0); | |
365 | /* XXX: should we free all rules when we catch an error? */ | |
366 | if (ret && (!err || err != -ENOMEM)) | |
367 | err = ret; | |
368 | } | |
369 | return err; | |
370 | } | |
371 | ||
3de23255 BT |
372 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
373 | { | |
374 | struct ip6addrlbl_entry *p = NULL; | |
375 | struct hlist_node *pos, *n; | |
376 | ||
377 | /* Remove all labels belonging to the exiting net */ | |
378 | spin_lock(&ip6addrlbl_table.lock); | |
379 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
380 | if (net_eq(ip6addrlbl_net(p), net)) { | |
381 | hlist_del_rcu(&p->list); | |
382 | ip6addrlbl_put(p); | |
383 | } | |
384 | } | |
385 | spin_unlock(&ip6addrlbl_table.lock); | |
386 | } | |
387 | ||
388 | static struct pernet_operations ipv6_addr_label_ops = { | |
389 | .init = ip6addrlbl_net_init, | |
390 | .exit = ip6addrlbl_net_exit, | |
391 | }; | |
392 | ||
2a8cc6c8 YH |
393 | int __init ipv6_addr_label_init(void) |
394 | { | |
395 | spin_lock_init(&ip6addrlbl_table.lock); | |
396 | ||
3de23255 | 397 | return register_pernet_subsys(&ipv6_addr_label_ops); |
2a8cc6c8 YH |
398 | } |
399 | ||
400 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { | |
401 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, | |
402 | [IFAL_LABEL] = { .len = sizeof(u32), }, | |
403 | }; | |
404 | ||
405 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, | |
406 | void *arg) | |
407 | { | |
3b1e0a65 | 408 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
409 | struct ifaddrlblmsg *ifal; |
410 | struct nlattr *tb[IFAL_MAX+1]; | |
411 | struct in6_addr *pfx; | |
412 | u32 label; | |
413 | int err = 0; | |
414 | ||
415 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
416 | if (err < 0) | |
417 | return err; | |
418 | ||
419 | ifal = nlmsg_data(nlh); | |
420 | ||
421 | if (ifal->ifal_family != AF_INET6 || | |
422 | ifal->ifal_prefixlen > 128) | |
423 | return -EINVAL; | |
424 | ||
425 | if (ifal->ifal_index && | |
3de23255 | 426 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
427 | return -EINVAL; |
428 | ||
429 | if (!tb[IFAL_ADDRESS]) | |
430 | return -EINVAL; | |
431 | ||
432 | pfx = nla_data(tb[IFAL_ADDRESS]); | |
433 | if (!pfx) | |
434 | return -EINVAL; | |
435 | ||
436 | if (!tb[IFAL_LABEL]) | |
437 | return -EINVAL; | |
438 | label = nla_get_u32(tb[IFAL_LABEL]); | |
439 | if (label == IPV6_ADDR_LABEL_DEFAULT) | |
440 | return -EINVAL; | |
441 | ||
442 | switch(nlh->nlmsg_type) { | |
443 | case RTM_NEWADDRLABEL: | |
3de23255 | 444 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
445 | ifal->ifal_index, label, |
446 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
447 | break; | |
448 | case RTM_DELADDRLABEL: | |
3de23255 | 449 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
450 | ifal->ifal_index); |
451 | break; | |
452 | default: | |
453 | err = -EOPNOTSUPP; | |
454 | } | |
455 | return err; | |
456 | } | |
457 | ||
458 | static inline void ip6addrlbl_putmsg(struct nlmsghdr *nlh, | |
459 | int prefixlen, int ifindex, u32 lseq) | |
460 | { | |
461 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); | |
462 | ifal->ifal_family = AF_INET6; | |
463 | ifal->ifal_prefixlen = prefixlen; | |
464 | ifal->ifal_flags = 0; | |
465 | ifal->ifal_index = ifindex; | |
466 | ifal->ifal_seq = lseq; | |
467 | }; | |
468 | ||
469 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
470 | struct ip6addrlbl_entry *p, | |
471 | u32 lseq, | |
472 | u32 pid, u32 seq, int event, | |
473 | unsigned int flags) | |
474 | { | |
475 | struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, event, | |
476 | sizeof(struct ifaddrlblmsg), flags); | |
477 | if (!nlh) | |
478 | return -EMSGSIZE; | |
479 | ||
480 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
481 | ||
482 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || | |
483 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
484 | nlmsg_cancel(skb, nlh); | |
485 | return -EMSGSIZE; | |
486 | } | |
487 | ||
488 | return nlmsg_end(skb, nlh); | |
489 | } | |
490 | ||
491 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
492 | { | |
3b1e0a65 | 493 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
494 | struct ip6addrlbl_entry *p; |
495 | struct hlist_node *pos; | |
496 | int idx = 0, s_idx = cb->args[0]; | |
497 | int err; | |
498 | ||
499 | rcu_read_lock(); | |
500 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 BT |
501 | if (idx >= s_idx && |
502 | net_eq(ip6addrlbl_net(p), net)) { | |
2a8cc6c8 YH |
503 | if ((err = ip6addrlbl_fill(skb, p, |
504 | ip6addrlbl_table.seq, | |
505 | NETLINK_CB(cb->skb).pid, | |
506 | cb->nlh->nlmsg_seq, | |
507 | RTM_NEWADDRLABEL, | |
508 | NLM_F_MULTI)) <= 0) | |
509 | break; | |
510 | } | |
511 | idx++; | |
512 | } | |
513 | rcu_read_unlock(); | |
514 | cb->args[0] = idx; | |
515 | return skb->len; | |
516 | } | |
517 | ||
518 | static inline int ip6addrlbl_msgsize(void) | |
519 | { | |
520 | return (NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) | |
521 | + nla_total_size(16) /* IFAL_ADDRESS */ | |
522 | + nla_total_size(4) /* IFAL_LABEL */ | |
523 | ); | |
524 | } | |
525 | ||
526 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh, | |
527 | void *arg) | |
528 | { | |
3b1e0a65 | 529 | struct net *net = sock_net(in_skb->sk); |
2a8cc6c8 YH |
530 | struct ifaddrlblmsg *ifal; |
531 | struct nlattr *tb[IFAL_MAX+1]; | |
532 | struct in6_addr *addr; | |
533 | u32 lseq; | |
534 | int err = 0; | |
535 | struct ip6addrlbl_entry *p; | |
536 | struct sk_buff *skb; | |
537 | ||
538 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
539 | if (err < 0) | |
540 | return err; | |
541 | ||
542 | ifal = nlmsg_data(nlh); | |
543 | ||
544 | if (ifal->ifal_family != AF_INET6 || | |
545 | ifal->ifal_prefixlen != 128) | |
546 | return -EINVAL; | |
547 | ||
548 | if (ifal->ifal_index && | |
3de23255 | 549 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
550 | return -EINVAL; |
551 | ||
552 | if (!tb[IFAL_ADDRESS]) | |
553 | return -EINVAL; | |
554 | ||
555 | addr = nla_data(tb[IFAL_ADDRESS]); | |
556 | if (!addr) | |
557 | return -EINVAL; | |
558 | ||
559 | rcu_read_lock(); | |
3de23255 | 560 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
2a8cc6c8 YH |
561 | if (p && ip6addrlbl_hold(p)) |
562 | p = NULL; | |
563 | lseq = ip6addrlbl_table.seq; | |
564 | rcu_read_unlock(); | |
565 | ||
566 | if (!p) { | |
567 | err = -ESRCH; | |
568 | goto out; | |
569 | } | |
570 | ||
571 | if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) { | |
572 | ip6addrlbl_put(p); | |
573 | return -ENOBUFS; | |
574 | } | |
575 | ||
576 | err = ip6addrlbl_fill(skb, p, lseq, | |
577 | NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, | |
578 | RTM_NEWADDRLABEL, 0); | |
579 | ||
580 | ip6addrlbl_put(p); | |
581 | ||
582 | if (err < 0) { | |
583 | WARN_ON(err == -EMSGSIZE); | |
584 | kfree_skb(skb); | |
585 | goto out; | |
586 | } | |
587 | ||
3de23255 | 588 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
2a8cc6c8 YH |
589 | out: |
590 | return err; | |
591 | } | |
592 | ||
593 | void __init ipv6_addr_label_rtnl_register(void) | |
594 | { | |
595 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, NULL); | |
596 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, NULL); | |
597 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, ip6addrlbl_dump); | |
598 | } | |
599 |