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> | |
16 | #include <net/addrconf.h> | |
17 | #include <linux/if_addrlabel.h> | |
18 | #include <linux/netlink.h> | |
19 | #include <linux/rtnetlink.h> | |
20 | ||
21 | #if 0 | |
22 | #define ADDRLABEL(x...) printk(x) | |
23 | #else | |
24 | #define ADDRLABEL(x...) do { ; } while(0) | |
25 | #endif | |
26 | ||
27 | /* | |
28 | * Policy Table | |
29 | */ | |
30 | struct ip6addrlbl_entry | |
31 | { | |
3de23255 BT |
32 | #ifdef CONFIG_NET_NS |
33 | struct net *lbl_net; | |
34 | #endif | |
2a8cc6c8 YH |
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 | ||
3de23255 BT |
52 | static inline |
53 | struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl) | |
54 | { | |
55 | #ifdef CONFIG_NET_NS | |
56 | return lbl->lbl_net; | |
57 | #else | |
58 | return &init_net; | |
59 | #endif | |
60 | } | |
61 | ||
2a8cc6c8 YH |
62 | /* |
63 | * Default policy table (RFC3484 + extensions) | |
64 | * | |
65 | * prefix addr_type label | |
66 | * ------------------------------------------------------------------------- | |
67 | * ::1/128 LOOPBACK 0 | |
68 | * ::/0 N/A 1 | |
69 | * 2002::/16 N/A 2 | |
70 | * ::/96 COMPATv4 3 | |
71 | * ::ffff:0:0/96 V4MAPPED 4 | |
72 | * fc00::/7 N/A 5 ULA (RFC 4193) | |
73 | * 2001::/32 N/A 6 Teredo (RFC 4380) | |
5fe47b8a | 74 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) |
2a8cc6c8 YH |
75 | * |
76 | * Note: 0xffffffff is used if we do not have any policies. | |
77 | */ | |
78 | ||
79 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
80 | ||
3de23255 | 81 | static const __net_initdata struct ip6addrlbl_init_table |
2a8cc6c8 YH |
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 | },{ /* 2002::/16 */ | |
95 | .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}}, | |
96 | .prefixlen = 16, | |
97 | .label = 2, | |
98 | },{ /* 2001::/32 */ | |
99 | .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}}, | |
100 | .prefixlen = 32, | |
101 | .label = 6, | |
5fe47b8a JMT |
102 | },{ /* 2001:10::/28 */ |
103 | .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}}, | |
104 | .prefixlen = 28, | |
105 | .label = 7, | |
2a8cc6c8 YH |
106 | },{ /* ::ffff:0:0 */ |
107 | .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}}, | |
108 | .prefixlen = 96, | |
109 | .label = 4, | |
110 | },{ /* ::/96 */ | |
111 | .prefix = &in6addr_any, | |
112 | .prefixlen = 96, | |
113 | .label = 3, | |
114 | },{ /* ::1/128 */ | |
115 | .prefix = &in6addr_loopback, | |
116 | .prefixlen = 128, | |
117 | .label = 0, | |
118 | } | |
119 | }; | |
120 | ||
121 | /* Object management */ | |
122 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) | |
123 | { | |
3de23255 BT |
124 | #ifdef CONFIG_NET_NS |
125 | release_net(p->lbl_net); | |
126 | #endif | |
2a8cc6c8 YH |
127 | kfree(p); |
128 | } | |
129 | ||
85040bcb YH |
130 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
131 | { | |
132 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
133 | } | |
134 | ||
2a8cc6c8 YH |
135 | static inline int ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
136 | { | |
137 | return atomic_inc_not_zero(&p->refcnt); | |
138 | } | |
139 | ||
140 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) | |
141 | { | |
142 | if (atomic_dec_and_test(&p->refcnt)) | |
85040bcb | 143 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
2a8cc6c8 YH |
144 | } |
145 | ||
146 | /* Find label */ | |
3de23255 BT |
147 | static int __ip6addrlbl_match(struct net *net, |
148 | struct ip6addrlbl_entry *p, | |
2a8cc6c8 YH |
149 | const struct in6_addr *addr, |
150 | int addrtype, int ifindex) | |
151 | { | |
3de23255 BT |
152 | if (!net_eq(ip6addrlbl_net(p), net)) |
153 | return 0; | |
2a8cc6c8 YH |
154 | if (p->ifindex && p->ifindex != ifindex) |
155 | return 0; | |
156 | if (p->addrtype && p->addrtype != addrtype) | |
157 | return 0; | |
158 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) | |
159 | return 0; | |
160 | return 1; | |
161 | } | |
162 | ||
3de23255 BT |
163 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, |
164 | const struct in6_addr *addr, | |
2a8cc6c8 YH |
165 | int type, int ifindex) |
166 | { | |
167 | struct hlist_node *pos; | |
168 | struct ip6addrlbl_entry *p; | |
169 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 | 170 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
2a8cc6c8 YH |
171 | return p; |
172 | } | |
173 | return NULL; | |
174 | } | |
175 | ||
3de23255 BT |
176 | u32 ipv6_addr_label(struct net *net, |
177 | const struct in6_addr *addr, int type, int ifindex) | |
2a8cc6c8 YH |
178 | { |
179 | u32 label; | |
180 | struct ip6addrlbl_entry *p; | |
181 | ||
182 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; | |
183 | ||
184 | rcu_read_lock(); | |
3de23255 | 185 | p = __ipv6_addr_label(net, addr, type, ifindex); |
2a8cc6c8 YH |
186 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
187 | rcu_read_unlock(); | |
188 | ||
189 | ADDRLABEL(KERN_DEBUG "%s(addr=" NIP6_FMT ", type=%d, ifindex=%d) => %08x\n", | |
0dc47877 | 190 | __func__, |
2a8cc6c8 YH |
191 | NIP6(*addr), type, ifindex, |
192 | label); | |
193 | ||
194 | return label; | |
195 | } | |
196 | ||
197 | /* allocate one entry */ | |
3de23255 BT |
198 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
199 | const struct in6_addr *prefix, | |
40fee36e YH |
200 | int prefixlen, int ifindex, |
201 | u32 label) | |
2a8cc6c8 YH |
202 | { |
203 | struct ip6addrlbl_entry *newp; | |
204 | int addrtype; | |
205 | ||
206 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d, label=%u)\n", | |
0dc47877 | 207 | __func__, |
2a8cc6c8 YH |
208 | NIP6(*prefix), prefixlen, |
209 | ifindex, | |
210 | (unsigned int)label); | |
211 | ||
212 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); | |
213 | ||
214 | switch (addrtype) { | |
215 | case IPV6_ADDR_MAPPED: | |
216 | if (prefixlen > 96) | |
217 | return ERR_PTR(-EINVAL); | |
218 | if (prefixlen < 96) | |
219 | addrtype = 0; | |
220 | break; | |
221 | case IPV6_ADDR_COMPATv4: | |
222 | if (prefixlen != 96) | |
223 | addrtype = 0; | |
224 | break; | |
225 | case IPV6_ADDR_LOOPBACK: | |
226 | if (prefixlen != 128) | |
227 | addrtype = 0; | |
228 | break; | |
229 | } | |
230 | ||
231 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); | |
232 | if (!newp) | |
233 | return ERR_PTR(-ENOMEM); | |
234 | ||
235 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); | |
236 | newp->prefixlen = prefixlen; | |
237 | newp->ifindex = ifindex; | |
238 | newp->addrtype = addrtype; | |
239 | newp->label = label; | |
240 | INIT_HLIST_NODE(&newp->list); | |
3de23255 BT |
241 | #ifdef CONFIG_NET_NS |
242 | newp->lbl_net = hold_net(net); | |
243 | #endif | |
2a8cc6c8 YH |
244 | atomic_set(&newp->refcnt, 1); |
245 | return newp; | |
246 | } | |
247 | ||
248 | /* add a label */ | |
40fee36e | 249 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
2a8cc6c8 YH |
250 | { |
251 | int ret = 0; | |
252 | ||
253 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", | |
0dc47877 | 254 | __func__, |
2a8cc6c8 YH |
255 | newp, replace); |
256 | ||
257 | if (hlist_empty(&ip6addrlbl_table.head)) { | |
258 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
259 | } else { | |
260 | struct hlist_node *pos, *n; | |
261 | struct ip6addrlbl_entry *p = NULL; | |
262 | hlist_for_each_entry_safe(p, pos, n, | |
263 | &ip6addrlbl_table.head, list) { | |
264 | if (p->prefixlen == newp->prefixlen && | |
3de23255 | 265 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && |
2a8cc6c8 YH |
266 | p->ifindex == newp->ifindex && |
267 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { | |
268 | if (!replace) { | |
269 | ret = -EEXIST; | |
270 | goto out; | |
271 | } | |
272 | hlist_replace_rcu(&p->list, &newp->list); | |
273 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
274 | goto out; |
275 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || | |
276 | (p->prefixlen < newp->prefixlen)) { | |
277 | hlist_add_before_rcu(&newp->list, &p->list); | |
278 | goto out; | |
279 | } | |
280 | } | |
281 | hlist_add_after_rcu(&p->list, &newp->list); | |
282 | } | |
283 | out: | |
284 | if (!ret) | |
285 | ip6addrlbl_table.seq++; | |
286 | return ret; | |
287 | } | |
288 | ||
289 | /* add a label */ | |
3de23255 BT |
290 | static int ip6addrlbl_add(struct net *net, |
291 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 292 | int ifindex, u32 label, int replace) |
2a8cc6c8 YH |
293 | { |
294 | struct ip6addrlbl_entry *newp; | |
295 | int ret = 0; | |
296 | ||
297 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", | |
0dc47877 | 298 | __func__, |
2a8cc6c8 YH |
299 | NIP6(*prefix), prefixlen, |
300 | ifindex, | |
301 | (unsigned int)label, | |
302 | replace); | |
303 | ||
3de23255 | 304 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); |
2a8cc6c8 YH |
305 | if (IS_ERR(newp)) |
306 | return PTR_ERR(newp); | |
307 | spin_lock(&ip6addrlbl_table.lock); | |
308 | ret = __ip6addrlbl_add(newp, replace); | |
309 | spin_unlock(&ip6addrlbl_table.lock); | |
310 | if (ret) | |
311 | ip6addrlbl_free(newp); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | /* remove a label */ | |
3de23255 BT |
316 | static int __ip6addrlbl_del(struct net *net, |
317 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 318 | int ifindex) |
2a8cc6c8 YH |
319 | { |
320 | struct ip6addrlbl_entry *p = NULL; | |
321 | struct hlist_node *pos, *n; | |
322 | int ret = -ESRCH; | |
323 | ||
324 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d)\n", | |
0dc47877 | 325 | __func__, |
2a8cc6c8 YH |
326 | NIP6(*prefix), prefixlen, |
327 | ifindex); | |
328 | ||
329 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
330 | if (p->prefixlen == prefixlen && | |
3de23255 | 331 | net_eq(ip6addrlbl_net(p), net) && |
2a8cc6c8 YH |
332 | p->ifindex == ifindex && |
333 | ipv6_addr_equal(&p->prefix, prefix)) { | |
334 | hlist_del_rcu(&p->list); | |
335 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
336 | ret = 0; |
337 | break; | |
338 | } | |
339 | } | |
340 | return ret; | |
341 | } | |
342 | ||
3de23255 BT |
343 | static int ip6addrlbl_del(struct net *net, |
344 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 345 | int ifindex) |
2a8cc6c8 YH |
346 | { |
347 | struct in6_addr prefix_buf; | |
348 | int ret; | |
349 | ||
350 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d)\n", | |
0dc47877 | 351 | __func__, |
2a8cc6c8 YH |
352 | NIP6(*prefix), prefixlen, |
353 | ifindex); | |
354 | ||
355 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
356 | spin_lock(&ip6addrlbl_table.lock); | |
3de23255 | 357 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
2a8cc6c8 YH |
358 | spin_unlock(&ip6addrlbl_table.lock); |
359 | return ret; | |
360 | } | |
361 | ||
362 | /* add default label */ | |
3de23255 | 363 | static int __net_init ip6addrlbl_net_init(struct net *net) |
2a8cc6c8 YH |
364 | { |
365 | int err = 0; | |
366 | int i; | |
367 | ||
0dc47877 | 368 | ADDRLABEL(KERN_DEBUG "%s()\n", __func__); |
2a8cc6c8 YH |
369 | |
370 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
3de23255 BT |
371 | int ret = ip6addrlbl_add(net, |
372 | ip6addrlbl_init_table[i].prefix, | |
2a8cc6c8 YH |
373 | ip6addrlbl_init_table[i].prefixlen, |
374 | 0, | |
375 | ip6addrlbl_init_table[i].label, 0); | |
376 | /* XXX: should we free all rules when we catch an error? */ | |
377 | if (ret && (!err || err != -ENOMEM)) | |
378 | err = ret; | |
379 | } | |
380 | return err; | |
381 | } | |
382 | ||
3de23255 BT |
383 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
384 | { | |
385 | struct ip6addrlbl_entry *p = NULL; | |
386 | struct hlist_node *pos, *n; | |
387 | ||
388 | /* Remove all labels belonging to the exiting net */ | |
389 | spin_lock(&ip6addrlbl_table.lock); | |
390 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
391 | if (net_eq(ip6addrlbl_net(p), net)) { | |
392 | hlist_del_rcu(&p->list); | |
393 | ip6addrlbl_put(p); | |
394 | } | |
395 | } | |
396 | spin_unlock(&ip6addrlbl_table.lock); | |
397 | } | |
398 | ||
399 | static struct pernet_operations ipv6_addr_label_ops = { | |
400 | .init = ip6addrlbl_net_init, | |
401 | .exit = ip6addrlbl_net_exit, | |
402 | }; | |
403 | ||
2a8cc6c8 YH |
404 | int __init ipv6_addr_label_init(void) |
405 | { | |
406 | spin_lock_init(&ip6addrlbl_table.lock); | |
407 | ||
3de23255 | 408 | return register_pernet_subsys(&ipv6_addr_label_ops); |
2a8cc6c8 YH |
409 | } |
410 | ||
411 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { | |
412 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, | |
413 | [IFAL_LABEL] = { .len = sizeof(u32), }, | |
414 | }; | |
415 | ||
416 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, | |
417 | void *arg) | |
418 | { | |
3b1e0a65 | 419 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
420 | struct ifaddrlblmsg *ifal; |
421 | struct nlattr *tb[IFAL_MAX+1]; | |
422 | struct in6_addr *pfx; | |
423 | u32 label; | |
424 | int err = 0; | |
425 | ||
426 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
427 | if (err < 0) | |
428 | return err; | |
429 | ||
430 | ifal = nlmsg_data(nlh); | |
431 | ||
432 | if (ifal->ifal_family != AF_INET6 || | |
433 | ifal->ifal_prefixlen > 128) | |
434 | return -EINVAL; | |
435 | ||
436 | if (ifal->ifal_index && | |
3de23255 | 437 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
438 | return -EINVAL; |
439 | ||
440 | if (!tb[IFAL_ADDRESS]) | |
441 | return -EINVAL; | |
442 | ||
443 | pfx = nla_data(tb[IFAL_ADDRESS]); | |
444 | if (!pfx) | |
445 | return -EINVAL; | |
446 | ||
447 | if (!tb[IFAL_LABEL]) | |
448 | return -EINVAL; | |
449 | label = nla_get_u32(tb[IFAL_LABEL]); | |
450 | if (label == IPV6_ADDR_LABEL_DEFAULT) | |
451 | return -EINVAL; | |
452 | ||
453 | switch(nlh->nlmsg_type) { | |
454 | case RTM_NEWADDRLABEL: | |
3de23255 | 455 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
456 | ifal->ifal_index, label, |
457 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
458 | break; | |
459 | case RTM_DELADDRLABEL: | |
3de23255 | 460 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
461 | ifal->ifal_index); |
462 | break; | |
463 | default: | |
464 | err = -EOPNOTSUPP; | |
465 | } | |
466 | return err; | |
467 | } | |
468 | ||
469 | static inline void ip6addrlbl_putmsg(struct nlmsghdr *nlh, | |
470 | int prefixlen, int ifindex, u32 lseq) | |
471 | { | |
472 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); | |
473 | ifal->ifal_family = AF_INET6; | |
474 | ifal->ifal_prefixlen = prefixlen; | |
475 | ifal->ifal_flags = 0; | |
476 | ifal->ifal_index = ifindex; | |
477 | ifal->ifal_seq = lseq; | |
478 | }; | |
479 | ||
480 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
481 | struct ip6addrlbl_entry *p, | |
482 | u32 lseq, | |
483 | u32 pid, u32 seq, int event, | |
484 | unsigned int flags) | |
485 | { | |
486 | struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, event, | |
487 | sizeof(struct ifaddrlblmsg), flags); | |
488 | if (!nlh) | |
489 | return -EMSGSIZE; | |
490 | ||
491 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
492 | ||
493 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || | |
494 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
495 | nlmsg_cancel(skb, nlh); | |
496 | return -EMSGSIZE; | |
497 | } | |
498 | ||
499 | return nlmsg_end(skb, nlh); | |
500 | } | |
501 | ||
502 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
503 | { | |
3b1e0a65 | 504 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
505 | struct ip6addrlbl_entry *p; |
506 | struct hlist_node *pos; | |
507 | int idx = 0, s_idx = cb->args[0]; | |
508 | int err; | |
509 | ||
510 | rcu_read_lock(); | |
511 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 BT |
512 | if (idx >= s_idx && |
513 | net_eq(ip6addrlbl_net(p), net)) { | |
2a8cc6c8 YH |
514 | if ((err = ip6addrlbl_fill(skb, p, |
515 | ip6addrlbl_table.seq, | |
516 | NETLINK_CB(cb->skb).pid, | |
517 | cb->nlh->nlmsg_seq, | |
518 | RTM_NEWADDRLABEL, | |
519 | NLM_F_MULTI)) <= 0) | |
520 | break; | |
521 | } | |
522 | idx++; | |
523 | } | |
524 | rcu_read_unlock(); | |
525 | cb->args[0] = idx; | |
526 | return skb->len; | |
527 | } | |
528 | ||
529 | static inline int ip6addrlbl_msgsize(void) | |
530 | { | |
531 | return (NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) | |
532 | + nla_total_size(16) /* IFAL_ADDRESS */ | |
533 | + nla_total_size(4) /* IFAL_LABEL */ | |
534 | ); | |
535 | } | |
536 | ||
537 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh, | |
538 | void *arg) | |
539 | { | |
3b1e0a65 | 540 | struct net *net = sock_net(in_skb->sk); |
2a8cc6c8 YH |
541 | struct ifaddrlblmsg *ifal; |
542 | struct nlattr *tb[IFAL_MAX+1]; | |
543 | struct in6_addr *addr; | |
544 | u32 lseq; | |
545 | int err = 0; | |
546 | struct ip6addrlbl_entry *p; | |
547 | struct sk_buff *skb; | |
548 | ||
549 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
550 | if (err < 0) | |
551 | return err; | |
552 | ||
553 | ifal = nlmsg_data(nlh); | |
554 | ||
555 | if (ifal->ifal_family != AF_INET6 || | |
556 | ifal->ifal_prefixlen != 128) | |
557 | return -EINVAL; | |
558 | ||
559 | if (ifal->ifal_index && | |
3de23255 | 560 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
561 | return -EINVAL; |
562 | ||
563 | if (!tb[IFAL_ADDRESS]) | |
564 | return -EINVAL; | |
565 | ||
566 | addr = nla_data(tb[IFAL_ADDRESS]); | |
567 | if (!addr) | |
568 | return -EINVAL; | |
569 | ||
570 | rcu_read_lock(); | |
3de23255 | 571 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
2a8cc6c8 YH |
572 | if (p && ip6addrlbl_hold(p)) |
573 | p = NULL; | |
574 | lseq = ip6addrlbl_table.seq; | |
575 | rcu_read_unlock(); | |
576 | ||
577 | if (!p) { | |
578 | err = -ESRCH; | |
579 | goto out; | |
580 | } | |
581 | ||
582 | if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) { | |
583 | ip6addrlbl_put(p); | |
584 | return -ENOBUFS; | |
585 | } | |
586 | ||
587 | err = ip6addrlbl_fill(skb, p, lseq, | |
588 | NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, | |
589 | RTM_NEWADDRLABEL, 0); | |
590 | ||
591 | ip6addrlbl_put(p); | |
592 | ||
593 | if (err < 0) { | |
594 | WARN_ON(err == -EMSGSIZE); | |
595 | kfree_skb(skb); | |
596 | goto out; | |
597 | } | |
598 | ||
3de23255 | 599 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
2a8cc6c8 YH |
600 | out: |
601 | return err; | |
602 | } | |
603 | ||
604 | void __init ipv6_addr_label_rtnl_register(void) | |
605 | { | |
606 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, NULL); | |
607 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, NULL); | |
608 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, ip6addrlbl_dump); | |
609 | } | |
610 |