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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> | |
16 | #include <linux/slab.h> | |
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 | #ifdef CONFIG_NET_NS | |
33 | struct net *lbl_net; | |
34 | #endif | |
35 | struct in6_addr prefix; | |
36 | int prefixlen; | |
37 | int ifindex; | |
38 | int addrtype; | |
39 | u32 label; | |
40 | struct hlist_node list; | |
41 | atomic_t refcnt; | |
42 | struct rcu_head rcu; | |
43 | }; | |
44 | ||
45 | static struct ip6addrlbl_table | |
46 | { | |
47 | struct hlist_head head; | |
48 | spinlock_t lock; | |
49 | u32 seq; | |
50 | } ip6addrlbl_table; | |
51 | ||
52 | static inline | |
53 | struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl) | |
54 | { | |
55 | return read_pnet(&lbl->lbl_net); | |
56 | } | |
57 | ||
58 | /* | |
59 | * Default policy table (RFC6724 + extensions) | |
60 | * | |
61 | * prefix addr_type label | |
62 | * ------------------------------------------------------------------------- | |
63 | * ::1/128 LOOPBACK 0 | |
64 | * ::/0 N/A 1 | |
65 | * 2002::/16 N/A 2 | |
66 | * ::/96 COMPATv4 3 | |
67 | * ::ffff:0:0/96 V4MAPPED 4 | |
68 | * fc00::/7 N/A 5 ULA (RFC 4193) | |
69 | * 2001::/32 N/A 6 Teredo (RFC 4380) | |
70 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) | |
71 | * fec0::/10 N/A 11 Site-local | |
72 | * (deprecated by RFC3879) | |
73 | * 3ffe::/16 N/A 12 6bone | |
74 | * | |
75 | * Note: 0xffffffff is used if we do not have any policies. | |
76 | * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724. | |
77 | */ | |
78 | ||
79 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
80 | ||
81 | static const __net_initconst struct ip6addrlbl_init_table | |
82 | { | |
83 | const struct in6_addr *prefix; | |
84 | int prefixlen; | |
85 | u32 label; | |
86 | } ip6addrlbl_init_table[] = { | |
87 | { /* ::/0 */ | |
88 | .prefix = &in6addr_any, | |
89 | .label = 1, | |
90 | }, { /* fc00::/7 */ | |
91 | .prefix = &(struct in6_addr){ { { 0xfc } } } , | |
92 | .prefixlen = 7, | |
93 | .label = 5, | |
94 | }, { /* fec0::/10 */ | |
95 | .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } }, | |
96 | .prefixlen = 10, | |
97 | .label = 11, | |
98 | }, { /* 2002::/16 */ | |
99 | .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } }, | |
100 | .prefixlen = 16, | |
101 | .label = 2, | |
102 | }, { /* 3ffe::/16 */ | |
103 | .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } }, | |
104 | .prefixlen = 16, | |
105 | .label = 12, | |
106 | }, { /* 2001::/32 */ | |
107 | .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } }, | |
108 | .prefixlen = 32, | |
109 | .label = 6, | |
110 | }, { /* 2001:10::/28 */ | |
111 | .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } }, | |
112 | .prefixlen = 28, | |
113 | .label = 7, | |
114 | }, { /* ::ffff:0:0 */ | |
115 | .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } }, | |
116 | .prefixlen = 96, | |
117 | .label = 4, | |
118 | }, { /* ::/96 */ | |
119 | .prefix = &in6addr_any, | |
120 | .prefixlen = 96, | |
121 | .label = 3, | |
122 | }, { /* ::1/128 */ | |
123 | .prefix = &in6addr_loopback, | |
124 | .prefixlen = 128, | |
125 | .label = 0, | |
126 | } | |
127 | }; | |
128 | ||
129 | /* Object management */ | |
130 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) | |
131 | { | |
132 | #ifdef CONFIG_NET_NS | |
133 | release_net(p->lbl_net); | |
134 | #endif | |
135 | kfree(p); | |
136 | } | |
137 | ||
138 | static void ip6addrlbl_free_rcu(struct rcu_head *h) | |
139 | { | |
140 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
141 | } | |
142 | ||
143 | static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p) | |
144 | { | |
145 | return atomic_inc_not_zero(&p->refcnt); | |
146 | } | |
147 | ||
148 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) | |
149 | { | |
150 | if (atomic_dec_and_test(&p->refcnt)) | |
151 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); | |
152 | } | |
153 | ||
154 | /* Find label */ | |
155 | static bool __ip6addrlbl_match(struct net *net, | |
156 | const struct ip6addrlbl_entry *p, | |
157 | const struct in6_addr *addr, | |
158 | int addrtype, int ifindex) | |
159 | { | |
160 | if (!net_eq(ip6addrlbl_net(p), net)) | |
161 | return false; | |
162 | if (p->ifindex && p->ifindex != ifindex) | |
163 | return false; | |
164 | if (p->addrtype && p->addrtype != addrtype) | |
165 | return false; | |
166 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) | |
167 | return false; | |
168 | return true; | |
169 | } | |
170 | ||
171 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, | |
172 | const struct in6_addr *addr, | |
173 | int type, int ifindex) | |
174 | { | |
175 | struct ip6addrlbl_entry *p; | |
176 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { | |
177 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) | |
178 | return p; | |
179 | } | |
180 | return NULL; | |
181 | } | |
182 | ||
183 | u32 ipv6_addr_label(struct net *net, | |
184 | const struct in6_addr *addr, int type, int ifindex) | |
185 | { | |
186 | u32 label; | |
187 | struct ip6addrlbl_entry *p; | |
188 | ||
189 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; | |
190 | ||
191 | rcu_read_lock(); | |
192 | p = __ipv6_addr_label(net, addr, type, ifindex); | |
193 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; | |
194 | rcu_read_unlock(); | |
195 | ||
196 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", | |
197 | __func__, addr, type, ifindex, label); | |
198 | ||
199 | return label; | |
200 | } | |
201 | ||
202 | /* allocate one entry */ | |
203 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, | |
204 | const struct in6_addr *prefix, | |
205 | int prefixlen, int ifindex, | |
206 | u32 label) | |
207 | { | |
208 | struct ip6addrlbl_entry *newp; | |
209 | int addrtype; | |
210 | ||
211 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", | |
212 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); | |
213 | ||
214 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); | |
215 | ||
216 | switch (addrtype) { | |
217 | case IPV6_ADDR_MAPPED: | |
218 | if (prefixlen > 96) | |
219 | return ERR_PTR(-EINVAL); | |
220 | if (prefixlen < 96) | |
221 | addrtype = 0; | |
222 | break; | |
223 | case IPV6_ADDR_COMPATv4: | |
224 | if (prefixlen != 96) | |
225 | addrtype = 0; | |
226 | break; | |
227 | case IPV6_ADDR_LOOPBACK: | |
228 | if (prefixlen != 128) | |
229 | addrtype = 0; | |
230 | break; | |
231 | } | |
232 | ||
233 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); | |
234 | if (!newp) | |
235 | return ERR_PTR(-ENOMEM); | |
236 | ||
237 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); | |
238 | newp->prefixlen = prefixlen; | |
239 | newp->ifindex = ifindex; | |
240 | newp->addrtype = addrtype; | |
241 | newp->label = label; | |
242 | INIT_HLIST_NODE(&newp->list); | |
243 | #ifdef CONFIG_NET_NS | |
244 | newp->lbl_net = hold_net(net); | |
245 | #endif | |
246 | atomic_set(&newp->refcnt, 1); | |
247 | return newp; | |
248 | } | |
249 | ||
250 | /* add a label */ | |
251 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) | |
252 | { | |
253 | struct hlist_node *n; | |
254 | struct ip6addrlbl_entry *last = NULL, *p = NULL; | |
255 | int ret = 0; | |
256 | ||
257 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp, | |
258 | replace); | |
259 | ||
260 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { | |
261 | if (p->prefixlen == newp->prefixlen && | |
262 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && | |
263 | p->ifindex == newp->ifindex && | |
264 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { | |
265 | if (!replace) { | |
266 | ret = -EEXIST; | |
267 | goto out; | |
268 | } | |
269 | hlist_replace_rcu(&p->list, &newp->list); | |
270 | ip6addrlbl_put(p); | |
271 | goto out; | |
272 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || | |
273 | (p->prefixlen < newp->prefixlen)) { | |
274 | hlist_add_before_rcu(&newp->list, &p->list); | |
275 | goto out; | |
276 | } | |
277 | last = p; | |
278 | } | |
279 | if (last) | |
280 | hlist_add_after_rcu(&last->list, &newp->list); | |
281 | else | |
282 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
283 | out: | |
284 | if (!ret) | |
285 | ip6addrlbl_table.seq++; | |
286 | return ret; | |
287 | } | |
288 | ||
289 | /* add a label */ | |
290 | static int ip6addrlbl_add(struct net *net, | |
291 | const struct in6_addr *prefix, int prefixlen, | |
292 | int ifindex, u32 label, int replace) | |
293 | { | |
294 | struct ip6addrlbl_entry *newp; | |
295 | int ret = 0; | |
296 | ||
297 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", | |
298 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, | |
299 | replace); | |
300 | ||
301 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); | |
302 | if (IS_ERR(newp)) | |
303 | return PTR_ERR(newp); | |
304 | spin_lock(&ip6addrlbl_table.lock); | |
305 | ret = __ip6addrlbl_add(newp, replace); | |
306 | spin_unlock(&ip6addrlbl_table.lock); | |
307 | if (ret) | |
308 | ip6addrlbl_free(newp); | |
309 | return ret; | |
310 | } | |
311 | ||
312 | /* remove a label */ | |
313 | static int __ip6addrlbl_del(struct net *net, | |
314 | const struct in6_addr *prefix, int prefixlen, | |
315 | int ifindex) | |
316 | { | |
317 | struct ip6addrlbl_entry *p = NULL; | |
318 | struct hlist_node *n; | |
319 | int ret = -ESRCH; | |
320 | ||
321 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", | |
322 | __func__, prefix, prefixlen, ifindex); | |
323 | ||
324 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { | |
325 | if (p->prefixlen == prefixlen && | |
326 | net_eq(ip6addrlbl_net(p), net) && | |
327 | p->ifindex == ifindex && | |
328 | ipv6_addr_equal(&p->prefix, prefix)) { | |
329 | hlist_del_rcu(&p->list); | |
330 | ip6addrlbl_put(p); | |
331 | ret = 0; | |
332 | break; | |
333 | } | |
334 | } | |
335 | return ret; | |
336 | } | |
337 | ||
338 | static int ip6addrlbl_del(struct net *net, | |
339 | const struct in6_addr *prefix, int prefixlen, | |
340 | int ifindex) | |
341 | { | |
342 | struct in6_addr prefix_buf; | |
343 | int ret; | |
344 | ||
345 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", | |
346 | __func__, prefix, prefixlen, ifindex); | |
347 | ||
348 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
349 | spin_lock(&ip6addrlbl_table.lock); | |
350 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); | |
351 | spin_unlock(&ip6addrlbl_table.lock); | |
352 | return ret; | |
353 | } | |
354 | ||
355 | /* add default label */ | |
356 | static int __net_init ip6addrlbl_net_init(struct net *net) | |
357 | { | |
358 | int err = 0; | |
359 | int i; | |
360 | ||
361 | ADDRLABEL(KERN_DEBUG "%s\n", __func__); | |
362 | ||
363 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
364 | int ret = ip6addrlbl_add(net, | |
365 | ip6addrlbl_init_table[i].prefix, | |
366 | ip6addrlbl_init_table[i].prefixlen, | |
367 | 0, | |
368 | ip6addrlbl_init_table[i].label, 0); | |
369 | /* XXX: should we free all rules when we catch an error? */ | |
370 | if (ret && (!err || err != -ENOMEM)) | |
371 | err = ret; | |
372 | } | |
373 | return err; | |
374 | } | |
375 | ||
376 | static void __net_exit ip6addrlbl_net_exit(struct net *net) | |
377 | { | |
378 | struct ip6addrlbl_entry *p = NULL; | |
379 | struct hlist_node *n; | |
380 | ||
381 | /* Remove all labels belonging to the exiting net */ | |
382 | spin_lock(&ip6addrlbl_table.lock); | |
383 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { | |
384 | if (net_eq(ip6addrlbl_net(p), net)) { | |
385 | hlist_del_rcu(&p->list); | |
386 | ip6addrlbl_put(p); | |
387 | } | |
388 | } | |
389 | spin_unlock(&ip6addrlbl_table.lock); | |
390 | } | |
391 | ||
392 | static struct pernet_operations ipv6_addr_label_ops = { | |
393 | .init = ip6addrlbl_net_init, | |
394 | .exit = ip6addrlbl_net_exit, | |
395 | }; | |
396 | ||
397 | int __init ipv6_addr_label_init(void) | |
398 | { | |
399 | spin_lock_init(&ip6addrlbl_table.lock); | |
400 | ||
401 | return register_pernet_subsys(&ipv6_addr_label_ops); | |
402 | } | |
403 | ||
404 | void ipv6_addr_label_cleanup(void) | |
405 | { | |
406 | unregister_pernet_subsys(&ipv6_addr_label_ops); | |
407 | } | |
408 | ||
409 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { | |
410 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, | |
411 | [IFAL_LABEL] = { .len = sizeof(u32), }, | |
412 | }; | |
413 | ||
414 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh) | |
415 | { | |
416 | struct net *net = sock_net(skb->sk); | |
417 | struct ifaddrlblmsg *ifal; | |
418 | struct nlattr *tb[IFAL_MAX+1]; | |
419 | struct in6_addr *pfx; | |
420 | u32 label; | |
421 | int err = 0; | |
422 | ||
423 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
424 | if (err < 0) | |
425 | return err; | |
426 | ||
427 | ifal = nlmsg_data(nlh); | |
428 | ||
429 | if (ifal->ifal_family != AF_INET6 || | |
430 | ifal->ifal_prefixlen > 128) | |
431 | return -EINVAL; | |
432 | ||
433 | if (!tb[IFAL_ADDRESS]) | |
434 | return -EINVAL; | |
435 | pfx = nla_data(tb[IFAL_ADDRESS]); | |
436 | ||
437 | if (!tb[IFAL_LABEL]) | |
438 | return -EINVAL; | |
439 | label = nla_get_u32(tb[IFAL_LABEL]); | |
440 | if (label == IPV6_ADDR_LABEL_DEFAULT) | |
441 | return -EINVAL; | |
442 | ||
443 | switch (nlh->nlmsg_type) { | |
444 | case RTM_NEWADDRLABEL: | |
445 | if (ifal->ifal_index && | |
446 | !__dev_get_by_index(net, ifal->ifal_index)) | |
447 | return -EINVAL; | |
448 | ||
449 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, | |
450 | ifal->ifal_index, label, | |
451 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
452 | break; | |
453 | case RTM_DELADDRLABEL: | |
454 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, | |
455 | ifal->ifal_index); | |
456 | break; | |
457 | default: | |
458 | err = -EOPNOTSUPP; | |
459 | } | |
460 | return err; | |
461 | } | |
462 | ||
463 | static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, | |
464 | int prefixlen, int ifindex, u32 lseq) | |
465 | { | |
466 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); | |
467 | ifal->ifal_family = AF_INET6; | |
468 | ifal->ifal_prefixlen = prefixlen; | |
469 | ifal->ifal_flags = 0; | |
470 | ifal->ifal_index = ifindex; | |
471 | ifal->ifal_seq = lseq; | |
472 | }; | |
473 | ||
474 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
475 | struct ip6addrlbl_entry *p, | |
476 | u32 lseq, | |
477 | u32 portid, u32 seq, int event, | |
478 | unsigned int flags) | |
479 | { | |
480 | struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, | |
481 | sizeof(struct ifaddrlblmsg), flags); | |
482 | if (!nlh) | |
483 | return -EMSGSIZE; | |
484 | ||
485 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
486 | ||
487 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || | |
488 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
489 | nlmsg_cancel(skb, nlh); | |
490 | return -EMSGSIZE; | |
491 | } | |
492 | ||
493 | return nlmsg_end(skb, nlh); | |
494 | } | |
495 | ||
496 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
497 | { | |
498 | struct net *net = sock_net(skb->sk); | |
499 | struct ip6addrlbl_entry *p; | |
500 | int idx = 0, s_idx = cb->args[0]; | |
501 | int err; | |
502 | ||
503 | rcu_read_lock(); | |
504 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { | |
505 | if (idx >= s_idx && | |
506 | net_eq(ip6addrlbl_net(p), net)) { | |
507 | err = ip6addrlbl_fill(skb, p, | |
508 | ip6addrlbl_table.seq, | |
509 | NETLINK_CB(cb->skb).portid, | |
510 | cb->nlh->nlmsg_seq, | |
511 | RTM_NEWADDRLABEL, | |
512 | NLM_F_MULTI); | |
513 | if (err <= 0) | |
514 | break; | |
515 | } | |
516 | idx++; | |
517 | } | |
518 | rcu_read_unlock(); | |
519 | cb->args[0] = idx; | |
520 | return skb->len; | |
521 | } | |
522 | ||
523 | static inline int ip6addrlbl_msgsize(void) | |
524 | { | |
525 | return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) | |
526 | + nla_total_size(16) /* IFAL_ADDRESS */ | |
527 | + nla_total_size(4); /* IFAL_LABEL */ | |
528 | } | |
529 | ||
530 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh) | |
531 | { | |
532 | struct net *net = sock_net(in_skb->sk); | |
533 | struct ifaddrlblmsg *ifal; | |
534 | struct nlattr *tb[IFAL_MAX+1]; | |
535 | struct in6_addr *addr; | |
536 | u32 lseq; | |
537 | int err = 0; | |
538 | struct ip6addrlbl_entry *p; | |
539 | struct sk_buff *skb; | |
540 | ||
541 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
542 | if (err < 0) | |
543 | return err; | |
544 | ||
545 | ifal = nlmsg_data(nlh); | |
546 | ||
547 | if (ifal->ifal_family != AF_INET6 || | |
548 | ifal->ifal_prefixlen != 128) | |
549 | return -EINVAL; | |
550 | ||
551 | if (ifal->ifal_index && | |
552 | !__dev_get_by_index(net, ifal->ifal_index)) | |
553 | return -EINVAL; | |
554 | ||
555 | if (!tb[IFAL_ADDRESS]) | |
556 | return -EINVAL; | |
557 | addr = nla_data(tb[IFAL_ADDRESS]); | |
558 | ||
559 | rcu_read_lock(); | |
560 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); | |
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 | skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL); | |
572 | if (!skb) { | |
573 | ip6addrlbl_put(p); | |
574 | return -ENOBUFS; | |
575 | } | |
576 | ||
577 | err = ip6addrlbl_fill(skb, p, lseq, | |
578 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, | |
579 | RTM_NEWADDRLABEL, 0); | |
580 | ||
581 | ip6addrlbl_put(p); | |
582 | ||
583 | if (err < 0) { | |
584 | WARN_ON(err == -EMSGSIZE); | |
585 | kfree_skb(skb); | |
586 | goto out; | |
587 | } | |
588 | ||
589 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
590 | out: | |
591 | return err; | |
592 | } | |
593 | ||
594 | void __init ipv6_addr_label_rtnl_register(void) | |
595 | { | |
596 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, | |
597 | NULL, NULL); | |
598 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, | |
599 | NULL, NULL); | |
600 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, | |
601 | ip6addrlbl_dump, NULL); | |
602 | } | |
603 |