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 | 59 | /* |
417962a0 | 60 | * Default policy table (RFC6724 + extensions) |
2a8cc6c8 YH |
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) |
417962a0 YH |
72 | * fec0::/10 N/A 11 Site-local |
73 | * (deprecated by RFC3879) | |
74 | * 3ffe::/16 N/A 12 6bone | |
2a8cc6c8 YH |
75 | * |
76 | * Note: 0xffffffff is used if we do not have any policies. | |
417962a0 | 77 | * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724. |
2a8cc6c8 YH |
78 | */ |
79 | ||
80 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
81 | ||
04a6f82c | 82 | static const __net_initconst 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, | |
417962a0 YH |
95 | },{ /* fec0::/10 */ |
96 | .prefix = &(struct in6_addr){{{ 0xfe, 0xc0 }}}, | |
97 | .prefixlen = 10, | |
98 | .label = 11, | |
2a8cc6c8 YH |
99 | },{ /* 2002::/16 */ |
100 | .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}}, | |
101 | .prefixlen = 16, | |
102 | .label = 2, | |
417962a0 YH |
103 | },{ /* 3ffe::/16 */ |
104 | .prefix = &(struct in6_addr){{{ 0x3f, 0xfe }}}, | |
105 | .prefixlen = 16, | |
106 | .label = 12, | |
2a8cc6c8 YH |
107 | },{ /* 2001::/32 */ |
108 | .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}}, | |
109 | .prefixlen = 32, | |
110 | .label = 6, | |
5fe47b8a JMT |
111 | },{ /* 2001:10::/28 */ |
112 | .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}}, | |
113 | .prefixlen = 28, | |
114 | .label = 7, | |
2a8cc6c8 YH |
115 | },{ /* ::ffff:0:0 */ |
116 | .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}}, | |
117 | .prefixlen = 96, | |
118 | .label = 4, | |
119 | },{ /* ::/96 */ | |
120 | .prefix = &in6addr_any, | |
121 | .prefixlen = 96, | |
122 | .label = 3, | |
123 | },{ /* ::1/128 */ | |
124 | .prefix = &in6addr_loopback, | |
125 | .prefixlen = 128, | |
126 | .label = 0, | |
127 | } | |
128 | }; | |
129 | ||
130 | /* Object management */ | |
131 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) | |
132 | { | |
3de23255 BT |
133 | #ifdef CONFIG_NET_NS |
134 | release_net(p->lbl_net); | |
135 | #endif | |
2a8cc6c8 YH |
136 | kfree(p); |
137 | } | |
138 | ||
85040bcb YH |
139 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
140 | { | |
141 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
142 | } | |
143 | ||
a50feda5 | 144 | static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
2a8cc6c8 YH |
145 | { |
146 | return atomic_inc_not_zero(&p->refcnt); | |
147 | } | |
148 | ||
149 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) | |
150 | { | |
151 | if (atomic_dec_and_test(&p->refcnt)) | |
85040bcb | 152 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
2a8cc6c8 YH |
153 | } |
154 | ||
155 | /* Find label */ | |
a50feda5 ED |
156 | static bool __ip6addrlbl_match(struct net *net, |
157 | const struct ip6addrlbl_entry *p, | |
158 | const struct in6_addr *addr, | |
159 | int addrtype, int ifindex) | |
2a8cc6c8 | 160 | { |
3de23255 | 161 | if (!net_eq(ip6addrlbl_net(p), net)) |
a50feda5 | 162 | return false; |
2a8cc6c8 | 163 | if (p->ifindex && p->ifindex != ifindex) |
a50feda5 | 164 | return false; |
2a8cc6c8 | 165 | if (p->addrtype && p->addrtype != addrtype) |
a50feda5 | 166 | return false; |
2a8cc6c8 | 167 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) |
a50feda5 ED |
168 | return false; |
169 | return true; | |
2a8cc6c8 YH |
170 | } |
171 | ||
3de23255 BT |
172 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, |
173 | const struct in6_addr *addr, | |
2a8cc6c8 YH |
174 | int type, int ifindex) |
175 | { | |
2a8cc6c8 | 176 | struct ip6addrlbl_entry *p; |
b67bfe0d | 177 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { |
3de23255 | 178 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
2a8cc6c8 YH |
179 | return p; |
180 | } | |
181 | return NULL; | |
182 | } | |
183 | ||
3de23255 BT |
184 | u32 ipv6_addr_label(struct net *net, |
185 | const struct in6_addr *addr, int type, int ifindex) | |
2a8cc6c8 YH |
186 | { |
187 | u32 label; | |
188 | struct ip6addrlbl_entry *p; | |
189 | ||
190 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; | |
191 | ||
192 | rcu_read_lock(); | |
3de23255 | 193 | p = __ipv6_addr_label(net, addr, type, ifindex); |
2a8cc6c8 YH |
194 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
195 | rcu_read_unlock(); | |
196 | ||
5b095d98 | 197 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", |
0c6ce78a | 198 | __func__, addr, type, ifindex, label); |
2a8cc6c8 YH |
199 | |
200 | return label; | |
201 | } | |
202 | ||
203 | /* allocate one entry */ | |
3de23255 BT |
204 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
205 | const struct in6_addr *prefix, | |
40fee36e YH |
206 | int prefixlen, int ifindex, |
207 | u32 label) | |
2a8cc6c8 YH |
208 | { |
209 | struct ip6addrlbl_entry *newp; | |
210 | int addrtype; | |
211 | ||
5b095d98 | 212 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", |
0c6ce78a | 213 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); |
2a8cc6c8 YH |
214 | |
215 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); | |
216 | ||
217 | switch (addrtype) { | |
218 | case IPV6_ADDR_MAPPED: | |
219 | if (prefixlen > 96) | |
220 | return ERR_PTR(-EINVAL); | |
221 | if (prefixlen < 96) | |
222 | addrtype = 0; | |
223 | break; | |
224 | case IPV6_ADDR_COMPATv4: | |
225 | if (prefixlen != 96) | |
226 | addrtype = 0; | |
227 | break; | |
228 | case IPV6_ADDR_LOOPBACK: | |
229 | if (prefixlen != 128) | |
230 | addrtype = 0; | |
231 | break; | |
232 | } | |
233 | ||
234 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); | |
235 | if (!newp) | |
236 | return ERR_PTR(-ENOMEM); | |
237 | ||
238 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); | |
239 | newp->prefixlen = prefixlen; | |
240 | newp->ifindex = ifindex; | |
241 | newp->addrtype = addrtype; | |
242 | newp->label = label; | |
243 | INIT_HLIST_NODE(&newp->list); | |
3de23255 BT |
244 | #ifdef CONFIG_NET_NS |
245 | newp->lbl_net = hold_net(net); | |
246 | #endif | |
2a8cc6c8 YH |
247 | atomic_set(&newp->refcnt, 1); |
248 | return newp; | |
249 | } | |
250 | ||
251 | /* add a label */ | |
40fee36e | 252 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
2a8cc6c8 YH |
253 | { |
254 | int ret = 0; | |
255 | ||
256 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", | |
0dc47877 | 257 | __func__, |
2a8cc6c8 YH |
258 | newp, replace); |
259 | ||
260 | if (hlist_empty(&ip6addrlbl_table.head)) { | |
261 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
262 | } else { | |
b67bfe0d | 263 | struct hlist_node *n; |
2a8cc6c8 | 264 | struct ip6addrlbl_entry *p = NULL; |
b67bfe0d | 265 | hlist_for_each_entry_safe(p, n, |
2a8cc6c8 YH |
266 | &ip6addrlbl_table.head, list) { |
267 | if (p->prefixlen == newp->prefixlen && | |
3de23255 | 268 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && |
2a8cc6c8 YH |
269 | p->ifindex == newp->ifindex && |
270 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { | |
271 | if (!replace) { | |
272 | ret = -EEXIST; | |
273 | goto out; | |
274 | } | |
275 | hlist_replace_rcu(&p->list, &newp->list); | |
276 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
277 | goto out; |
278 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || | |
279 | (p->prefixlen < newp->prefixlen)) { | |
280 | hlist_add_before_rcu(&newp->list, &p->list); | |
281 | goto out; | |
282 | } | |
283 | } | |
284 | hlist_add_after_rcu(&p->list, &newp->list); | |
285 | } | |
286 | out: | |
287 | if (!ret) | |
288 | ip6addrlbl_table.seq++; | |
289 | return ret; | |
290 | } | |
291 | ||
292 | /* add a label */ | |
3de23255 BT |
293 | static int ip6addrlbl_add(struct net *net, |
294 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 295 | int ifindex, u32 label, int replace) |
2a8cc6c8 YH |
296 | { |
297 | struct ip6addrlbl_entry *newp; | |
298 | int ret = 0; | |
299 | ||
5b095d98 | 300 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
0c6ce78a HH |
301 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, |
302 | replace); | |
2a8cc6c8 | 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; | |
b67bfe0d | 321 | struct hlist_node *n; |
2a8cc6c8 YH |
322 | int ret = -ESRCH; |
323 | ||
5b095d98 | 324 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 325 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 | 326 | |
b67bfe0d | 327 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
2a8cc6c8 | 328 | if (p->prefixlen == prefixlen && |
3de23255 | 329 | net_eq(ip6addrlbl_net(p), net) && |
2a8cc6c8 YH |
330 | p->ifindex == ifindex && |
331 | ipv6_addr_equal(&p->prefix, prefix)) { | |
332 | hlist_del_rcu(&p->list); | |
333 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
334 | ret = 0; |
335 | break; | |
336 | } | |
337 | } | |
338 | return ret; | |
339 | } | |
340 | ||
3de23255 BT |
341 | static int ip6addrlbl_del(struct net *net, |
342 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 343 | int ifindex) |
2a8cc6c8 YH |
344 | { |
345 | struct in6_addr prefix_buf; | |
346 | int ret; | |
347 | ||
5b095d98 | 348 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 349 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
350 | |
351 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
352 | spin_lock(&ip6addrlbl_table.lock); | |
3de23255 | 353 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
2a8cc6c8 YH |
354 | spin_unlock(&ip6addrlbl_table.lock); |
355 | return ret; | |
356 | } | |
357 | ||
358 | /* add default label */ | |
3de23255 | 359 | static int __net_init ip6addrlbl_net_init(struct net *net) |
2a8cc6c8 YH |
360 | { |
361 | int err = 0; | |
362 | int i; | |
363 | ||
f3213831 | 364 | ADDRLABEL(KERN_DEBUG "%s\n", __func__); |
2a8cc6c8 YH |
365 | |
366 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
3de23255 BT |
367 | int ret = ip6addrlbl_add(net, |
368 | ip6addrlbl_init_table[i].prefix, | |
2a8cc6c8 YH |
369 | ip6addrlbl_init_table[i].prefixlen, |
370 | 0, | |
371 | ip6addrlbl_init_table[i].label, 0); | |
372 | /* XXX: should we free all rules when we catch an error? */ | |
373 | if (ret && (!err || err != -ENOMEM)) | |
374 | err = ret; | |
375 | } | |
376 | return err; | |
377 | } | |
378 | ||
3de23255 BT |
379 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
380 | { | |
381 | struct ip6addrlbl_entry *p = NULL; | |
b67bfe0d | 382 | struct hlist_node *n; |
3de23255 BT |
383 | |
384 | /* Remove all labels belonging to the exiting net */ | |
385 | spin_lock(&ip6addrlbl_table.lock); | |
b67bfe0d | 386 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
3de23255 BT |
387 | if (net_eq(ip6addrlbl_net(p), net)) { |
388 | hlist_del_rcu(&p->list); | |
389 | ip6addrlbl_put(p); | |
390 | } | |
391 | } | |
392 | spin_unlock(&ip6addrlbl_table.lock); | |
393 | } | |
394 | ||
395 | static struct pernet_operations ipv6_addr_label_ops = { | |
396 | .init = ip6addrlbl_net_init, | |
397 | .exit = ip6addrlbl_net_exit, | |
398 | }; | |
399 | ||
2a8cc6c8 YH |
400 | int __init ipv6_addr_label_init(void) |
401 | { | |
402 | spin_lock_init(&ip6addrlbl_table.lock); | |
403 | ||
3de23255 | 404 | return register_pernet_subsys(&ipv6_addr_label_ops); |
2a8cc6c8 YH |
405 | } |
406 | ||
2cc6d2bf NH |
407 | void ipv6_addr_label_cleanup(void) |
408 | { | |
409 | unregister_pernet_subsys(&ipv6_addr_label_ops); | |
410 | } | |
411 | ||
2a8cc6c8 YH |
412 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { |
413 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, | |
414 | [IFAL_LABEL] = { .len = sizeof(u32), }, | |
415 | }; | |
416 | ||
661d2967 | 417 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh) |
2a8cc6c8 | 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 | ||
2a8cc6c8 YH |
436 | if (!tb[IFAL_ADDRESS]) |
437 | return -EINVAL; | |
2a8cc6c8 | 438 | pfx = nla_data(tb[IFAL_ADDRESS]); |
2a8cc6c8 YH |
439 | |
440 | if (!tb[IFAL_LABEL]) | |
441 | return -EINVAL; | |
442 | label = nla_get_u32(tb[IFAL_LABEL]); | |
443 | if (label == IPV6_ADDR_LABEL_DEFAULT) | |
444 | return -EINVAL; | |
445 | ||
446 | switch(nlh->nlmsg_type) { | |
447 | case RTM_NEWADDRLABEL: | |
0771275b FW |
448 | if (ifal->ifal_index && |
449 | !__dev_get_by_index(net, ifal->ifal_index)) | |
450 | return -EINVAL; | |
451 | ||
3de23255 | 452 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
453 | ifal->ifal_index, label, |
454 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
455 | break; | |
456 | case RTM_DELADDRLABEL: | |
3de23255 | 457 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
458 | ifal->ifal_index); |
459 | break; | |
460 | default: | |
461 | err = -EOPNOTSUPP; | |
462 | } | |
463 | return err; | |
464 | } | |
465 | ||
a50feda5 ED |
466 | static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, |
467 | int prefixlen, int ifindex, u32 lseq) | |
2a8cc6c8 YH |
468 | { |
469 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); | |
470 | ifal->ifal_family = AF_INET6; | |
471 | ifal->ifal_prefixlen = prefixlen; | |
472 | ifal->ifal_flags = 0; | |
473 | ifal->ifal_index = ifindex; | |
474 | ifal->ifal_seq = lseq; | |
475 | }; | |
476 | ||
477 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
478 | struct ip6addrlbl_entry *p, | |
479 | u32 lseq, | |
15e47304 | 480 | u32 portid, u32 seq, int event, |
2a8cc6c8 YH |
481 | unsigned int flags) |
482 | { | |
15e47304 | 483 | struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, |
2a8cc6c8 YH |
484 | sizeof(struct ifaddrlblmsg), flags); |
485 | if (!nlh) | |
486 | return -EMSGSIZE; | |
487 | ||
488 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
489 | ||
490 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || | |
491 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
492 | nlmsg_cancel(skb, nlh); | |
493 | return -EMSGSIZE; | |
494 | } | |
495 | ||
496 | return nlmsg_end(skb, nlh); | |
497 | } | |
498 | ||
499 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
500 | { | |
3b1e0a65 | 501 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 | 502 | struct ip6addrlbl_entry *p; |
2a8cc6c8 YH |
503 | int idx = 0, s_idx = cb->args[0]; |
504 | int err; | |
505 | ||
506 | rcu_read_lock(); | |
b67bfe0d | 507 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { |
3de23255 BT |
508 | if (idx >= s_idx && |
509 | net_eq(ip6addrlbl_net(p), net)) { | |
2a8cc6c8 YH |
510 | if ((err = ip6addrlbl_fill(skb, p, |
511 | ip6addrlbl_table.seq, | |
15e47304 | 512 | NETLINK_CB(cb->skb).portid, |
2a8cc6c8 YH |
513 | cb->nlh->nlmsg_seq, |
514 | RTM_NEWADDRLABEL, | |
515 | NLM_F_MULTI)) <= 0) | |
516 | break; | |
517 | } | |
518 | idx++; | |
519 | } | |
520 | rcu_read_unlock(); | |
521 | cb->args[0] = idx; | |
522 | return skb->len; | |
523 | } | |
524 | ||
525 | static inline int ip6addrlbl_msgsize(void) | |
526 | { | |
a02cec21 | 527 | return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) |
2a8cc6c8 | 528 | + nla_total_size(16) /* IFAL_ADDRESS */ |
a02cec21 | 529 | + nla_total_size(4); /* IFAL_LABEL */ |
2a8cc6c8 YH |
530 | } |
531 | ||
661d2967 | 532 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh) |
2a8cc6c8 | 533 | { |
3b1e0a65 | 534 | struct net *net = sock_net(in_skb->sk); |
2a8cc6c8 YH |
535 | struct ifaddrlblmsg *ifal; |
536 | struct nlattr *tb[IFAL_MAX+1]; | |
537 | struct in6_addr *addr; | |
538 | u32 lseq; | |
539 | int err = 0; | |
540 | struct ip6addrlbl_entry *p; | |
541 | struct sk_buff *skb; | |
542 | ||
543 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
544 | if (err < 0) | |
545 | return err; | |
546 | ||
547 | ifal = nlmsg_data(nlh); | |
548 | ||
549 | if (ifal->ifal_family != AF_INET6 || | |
550 | ifal->ifal_prefixlen != 128) | |
551 | return -EINVAL; | |
552 | ||
553 | if (ifal->ifal_index && | |
3de23255 | 554 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
555 | return -EINVAL; |
556 | ||
557 | if (!tb[IFAL_ADDRESS]) | |
558 | return -EINVAL; | |
2a8cc6c8 | 559 | addr = nla_data(tb[IFAL_ADDRESS]); |
2a8cc6c8 YH |
560 | |
561 | rcu_read_lock(); | |
3de23255 | 562 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
2a8cc6c8 YH |
563 | if (p && ip6addrlbl_hold(p)) |
564 | p = NULL; | |
565 | lseq = ip6addrlbl_table.seq; | |
566 | rcu_read_unlock(); | |
567 | ||
568 | if (!p) { | |
569 | err = -ESRCH; | |
570 | goto out; | |
571 | } | |
572 | ||
573 | if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) { | |
574 | ip6addrlbl_put(p); | |
575 | return -ENOBUFS; | |
576 | } | |
577 | ||
578 | err = ip6addrlbl_fill(skb, p, lseq, | |
15e47304 | 579 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
2a8cc6c8 YH |
580 | RTM_NEWADDRLABEL, 0); |
581 | ||
582 | ip6addrlbl_put(p); | |
583 | ||
584 | if (err < 0) { | |
585 | WARN_ON(err == -EMSGSIZE); | |
586 | kfree_skb(skb); | |
587 | goto out; | |
588 | } | |
589 | ||
15e47304 | 590 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
2a8cc6c8 YH |
591 | out: |
592 | return err; | |
593 | } | |
594 | ||
595 | void __init ipv6_addr_label_rtnl_register(void) | |
596 | { | |
c7ac8679 GR |
597 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, |
598 | NULL, NULL); | |
599 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, | |
600 | NULL, NULL); | |
601 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, | |
602 | ip6addrlbl_dump, NULL); | |
2a8cc6c8 YH |
603 | } |
604 |