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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 | possible_net_t lbl_net; | |
33 | 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 | ||
43 | static struct ip6addrlbl_table | |
44 | { | |
45 | struct hlist_head head; | |
46 | spinlock_t lock; | |
47 | u32 seq; | |
48 | } ip6addrlbl_table; | |
49 | ||
50 | static inline | |
51 | struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl) | |
52 | { | |
53 | return read_pnet(&lbl->lbl_net); | |
54 | } | |
55 | ||
56 | /* | |
57 | * Default policy table (RFC6724 + extensions) | |
58 | * | |
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) | |
68 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) | |
69 | * fec0::/10 N/A 11 Site-local | |
70 | * (deprecated by RFC3879) | |
71 | * 3ffe::/16 N/A 12 6bone | |
72 | * | |
73 | * Note: 0xffffffff is used if we do not have any policies. | |
74 | * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724. | |
75 | */ | |
76 | ||
77 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
78 | ||
79 | static const __net_initconst struct ip6addrlbl_init_table | |
80 | { | |
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, | |
88 | }, { /* fc00::/7 */ | |
89 | .prefix = &(struct in6_addr){ { { 0xfc } } } , | |
90 | .prefixlen = 7, | |
91 | .label = 5, | |
92 | }, { /* fec0::/10 */ | |
93 | .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } }, | |
94 | .prefixlen = 10, | |
95 | .label = 11, | |
96 | }, { /* 2002::/16 */ | |
97 | .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } }, | |
98 | .prefixlen = 16, | |
99 | .label = 2, | |
100 | }, { /* 3ffe::/16 */ | |
101 | .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } }, | |
102 | .prefixlen = 16, | |
103 | .label = 12, | |
104 | }, { /* 2001::/32 */ | |
105 | .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } }, | |
106 | .prefixlen = 32, | |
107 | .label = 6, | |
108 | }, { /* 2001:10::/28 */ | |
109 | .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } }, | |
110 | .prefixlen = 28, | |
111 | .label = 7, | |
112 | }, { /* ::ffff:0:0 */ | |
113 | .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } }, | |
114 | .prefixlen = 96, | |
115 | .label = 4, | |
116 | }, { /* ::/96 */ | |
117 | .prefix = &in6addr_any, | |
118 | .prefixlen = 96, | |
119 | .label = 3, | |
120 | }, { /* ::1/128 */ | |
121 | .prefix = &in6addr_loopback, | |
122 | .prefixlen = 128, | |
123 | .label = 0, | |
124 | } | |
125 | }; | |
126 | ||
127 | /* Object management */ | |
128 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) | |
129 | { | |
130 | kfree(p); | |
131 | } | |
132 | ||
133 | static void ip6addrlbl_free_rcu(struct rcu_head *h) | |
134 | { | |
135 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
136 | } | |
137 | ||
138 | static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p) | |
139 | { | |
140 | return atomic_inc_not_zero(&p->refcnt); | |
141 | } | |
142 | ||
143 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) | |
144 | { | |
145 | if (atomic_dec_and_test(&p->refcnt)) | |
146 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); | |
147 | } | |
148 | ||
149 | /* Find label */ | |
150 | static bool __ip6addrlbl_match(struct net *net, | |
151 | const struct ip6addrlbl_entry *p, | |
152 | const struct in6_addr *addr, | |
153 | int addrtype, int ifindex) | |
154 | { | |
155 | if (!net_eq(ip6addrlbl_net(p), net)) | |
156 | return false; | |
157 | if (p->ifindex && p->ifindex != ifindex) | |
158 | return false; | |
159 | if (p->addrtype && p->addrtype != addrtype) | |
160 | return false; | |
161 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) | |
162 | return false; | |
163 | return true; | |
164 | } | |
165 | ||
166 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, | |
167 | const struct in6_addr *addr, | |
168 | int type, int ifindex) | |
169 | { | |
170 | struct ip6addrlbl_entry *p; | |
171 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { | |
172 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) | |
173 | return p; | |
174 | } | |
175 | return NULL; | |
176 | } | |
177 | ||
178 | u32 ipv6_addr_label(struct net *net, | |
179 | const struct in6_addr *addr, int type, int ifindex) | |
180 | { | |
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(); | |
187 | p = __ipv6_addr_label(net, addr, type, ifindex); | |
188 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; | |
189 | rcu_read_unlock(); | |
190 | ||
191 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", | |
192 | __func__, addr, type, ifindex, label); | |
193 | ||
194 | return label; | |
195 | } | |
196 | ||
197 | /* allocate one entry */ | |
198 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, | |
199 | const struct in6_addr *prefix, | |
200 | int prefixlen, int ifindex, | |
201 | u32 label) | |
202 | { | |
203 | struct ip6addrlbl_entry *newp; | |
204 | int addrtype; | |
205 | ||
206 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", | |
207 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); | |
208 | ||
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); | |
238 | write_pnet(&newp->lbl_net, net); | |
239 | atomic_set(&newp->refcnt, 1); | |
240 | return newp; | |
241 | } | |
242 | ||
243 | /* add a label */ | |
244 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) | |
245 | { | |
246 | struct hlist_node *n; | |
247 | struct ip6addrlbl_entry *last = NULL, *p = NULL; | |
248 | int ret = 0; | |
249 | ||
250 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp, | |
251 | replace); | |
252 | ||
253 | 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; | |
260 | goto out; | |
261 | } | |
262 | 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; | |
269 | } | |
270 | last = p; | |
271 | } | |
272 | if (last) | |
273 | hlist_add_behind_rcu(&newp->list, &last->list); | |
274 | else | |
275 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
276 | out: | |
277 | if (!ret) | |
278 | ip6addrlbl_table.seq++; | |
279 | return ret; | |
280 | } | |
281 | ||
282 | /* add a label */ | |
283 | static int ip6addrlbl_add(struct net *net, | |
284 | const struct in6_addr *prefix, int prefixlen, | |
285 | int ifindex, u32 label, int replace) | |
286 | { | |
287 | struct ip6addrlbl_entry *newp; | |
288 | int ret = 0; | |
289 | ||
290 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", | |
291 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, | |
292 | replace); | |
293 | ||
294 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); | |
295 | 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 */ | |
306 | static int __ip6addrlbl_del(struct net *net, | |
307 | const struct in6_addr *prefix, int prefixlen, | |
308 | int ifindex) | |
309 | { | |
310 | struct ip6addrlbl_entry *p = NULL; | |
311 | struct hlist_node *n; | |
312 | int ret = -ESRCH; | |
313 | ||
314 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", | |
315 | __func__, prefix, prefixlen, ifindex); | |
316 | ||
317 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { | |
318 | if (p->prefixlen == prefixlen && | |
319 | net_eq(ip6addrlbl_net(p), net) && | |
320 | p->ifindex == ifindex && | |
321 | ipv6_addr_equal(&p->prefix, prefix)) { | |
322 | hlist_del_rcu(&p->list); | |
323 | ip6addrlbl_put(p); | |
324 | ret = 0; | |
325 | break; | |
326 | } | |
327 | } | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static int ip6addrlbl_del(struct net *net, | |
332 | const struct in6_addr *prefix, int prefixlen, | |
333 | int ifindex) | |
334 | { | |
335 | struct in6_addr prefix_buf; | |
336 | int ret; | |
337 | ||
338 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", | |
339 | __func__, prefix, prefixlen, ifindex); | |
340 | ||
341 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
342 | spin_lock(&ip6addrlbl_table.lock); | |
343 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); | |
344 | spin_unlock(&ip6addrlbl_table.lock); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* add default label */ | |
349 | static int __net_init ip6addrlbl_net_init(struct net *net) | |
350 | { | |
351 | int err = 0; | |
352 | int i; | |
353 | ||
354 | ADDRLABEL(KERN_DEBUG "%s\n", __func__); | |
355 | ||
356 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
357 | int ret = ip6addrlbl_add(net, | |
358 | ip6addrlbl_init_table[i].prefix, | |
359 | 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 | ||
369 | static void __net_exit ip6addrlbl_net_exit(struct net *net) | |
370 | { | |
371 | struct ip6addrlbl_entry *p = NULL; | |
372 | struct hlist_node *n; | |
373 | ||
374 | /* Remove all labels belonging to the exiting net */ | |
375 | spin_lock(&ip6addrlbl_table.lock); | |
376 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { | |
377 | 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 | ||
385 | static struct pernet_operations ipv6_addr_label_ops = { | |
386 | .init = ip6addrlbl_net_init, | |
387 | .exit = ip6addrlbl_net_exit, | |
388 | }; | |
389 | ||
390 | int __init ipv6_addr_label_init(void) | |
391 | { | |
392 | spin_lock_init(&ip6addrlbl_table.lock); | |
393 | ||
394 | return register_pernet_subsys(&ipv6_addr_label_ops); | |
395 | } | |
396 | ||
397 | void ipv6_addr_label_cleanup(void) | |
398 | { | |
399 | unregister_pernet_subsys(&ipv6_addr_label_ops); | |
400 | } | |
401 | ||
402 | static 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 | ||
407 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh) | |
408 | { | |
409 | struct net *net = sock_net(skb->sk); | |
410 | 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 | ||
426 | if (!tb[IFAL_ADDRESS]) | |
427 | return -EINVAL; | |
428 | pfx = nla_data(tb[IFAL_ADDRESS]); | |
429 | ||
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 | ||
436 | switch (nlh->nlmsg_type) { | |
437 | case RTM_NEWADDRLABEL: | |
438 | if (ifal->ifal_index && | |
439 | !__dev_get_by_index(net, ifal->ifal_index)) | |
440 | return -EINVAL; | |
441 | ||
442 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, | |
443 | ifal->ifal_index, label, | |
444 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
445 | break; | |
446 | case RTM_DELADDRLABEL: | |
447 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, | |
448 | ifal->ifal_index); | |
449 | break; | |
450 | default: | |
451 | err = -EOPNOTSUPP; | |
452 | } | |
453 | return err; | |
454 | } | |
455 | ||
456 | static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, | |
457 | int prefixlen, int ifindex, u32 lseq) | |
458 | { | |
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 | ||
467 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
468 | struct ip6addrlbl_entry *p, | |
469 | u32 lseq, | |
470 | u32 portid, u32 seq, int event, | |
471 | unsigned int flags) | |
472 | { | |
473 | struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, | |
474 | sizeof(struct ifaddrlblmsg), flags); | |
475 | if (!nlh) | |
476 | return -EMSGSIZE; | |
477 | ||
478 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
479 | ||
480 | if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 || | |
481 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
482 | nlmsg_cancel(skb, nlh); | |
483 | return -EMSGSIZE; | |
484 | } | |
485 | ||
486 | nlmsg_end(skb, nlh); | |
487 | return 0; | |
488 | } | |
489 | ||
490 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
491 | { | |
492 | struct net *net = sock_net(skb->sk); | |
493 | struct ip6addrlbl_entry *p; | |
494 | int idx = 0, s_idx = cb->args[0]; | |
495 | int err; | |
496 | ||
497 | rcu_read_lock(); | |
498 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { | |
499 | if (idx >= s_idx && | |
500 | net_eq(ip6addrlbl_net(p), net)) { | |
501 | 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); | |
507 | if (err < 0) | |
508 | break; | |
509 | } | |
510 | idx++; | |
511 | } | |
512 | rcu_read_unlock(); | |
513 | cb->args[0] = idx; | |
514 | return skb->len; | |
515 | } | |
516 | ||
517 | static inline int ip6addrlbl_msgsize(void) | |
518 | { | |
519 | return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) | |
520 | + nla_total_size(16) /* IFAL_ADDRESS */ | |
521 | + nla_total_size(4); /* IFAL_LABEL */ | |
522 | } | |
523 | ||
524 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh) | |
525 | { | |
526 | struct net *net = sock_net(in_skb->sk); | |
527 | 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 | ||
535 | 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 && | |
546 | !__dev_get_by_index(net, ifal->ifal_index)) | |
547 | return -EINVAL; | |
548 | ||
549 | if (!tb[IFAL_ADDRESS]) | |
550 | return -EINVAL; | |
551 | addr = nla_data(tb[IFAL_ADDRESS]); | |
552 | ||
553 | rcu_read_lock(); | |
554 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); | |
555 | 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 | ||
565 | skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL); | |
566 | if (!skb) { | |
567 | ip6addrlbl_put(p); | |
568 | return -ENOBUFS; | |
569 | } | |
570 | ||
571 | err = ip6addrlbl_fill(skb, p, lseq, | |
572 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, | |
573 | 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 | ||
583 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
584 | out: | |
585 | return err; | |
586 | } | |
587 | ||
588 | void __init ipv6_addr_label_rtnl_register(void) | |
589 | { | |
590 | __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); | |
596 | } | |
597 |