]>
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 | { | |
176 | struct hlist_node *pos; | |
177 | struct ip6addrlbl_entry *p; | |
178 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 | 179 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
2a8cc6c8 YH |
180 | return p; |
181 | } | |
182 | return NULL; | |
183 | } | |
184 | ||
3de23255 BT |
185 | u32 ipv6_addr_label(struct net *net, |
186 | const struct in6_addr *addr, int type, int ifindex) | |
2a8cc6c8 YH |
187 | { |
188 | u32 label; | |
189 | struct ip6addrlbl_entry *p; | |
190 | ||
191 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; | |
192 | ||
193 | rcu_read_lock(); | |
3de23255 | 194 | p = __ipv6_addr_label(net, addr, type, ifindex); |
2a8cc6c8 YH |
195 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
196 | rcu_read_unlock(); | |
197 | ||
5b095d98 | 198 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", |
0c6ce78a | 199 | __func__, addr, type, ifindex, label); |
2a8cc6c8 YH |
200 | |
201 | return label; | |
202 | } | |
203 | ||
204 | /* allocate one entry */ | |
3de23255 BT |
205 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
206 | const struct in6_addr *prefix, | |
40fee36e YH |
207 | int prefixlen, int ifindex, |
208 | u32 label) | |
2a8cc6c8 YH |
209 | { |
210 | struct ip6addrlbl_entry *newp; | |
211 | int addrtype; | |
212 | ||
5b095d98 | 213 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", |
0c6ce78a | 214 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); |
2a8cc6c8 YH |
215 | |
216 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); | |
217 | ||
218 | switch (addrtype) { | |
219 | case IPV6_ADDR_MAPPED: | |
220 | if (prefixlen > 96) | |
221 | return ERR_PTR(-EINVAL); | |
222 | if (prefixlen < 96) | |
223 | addrtype = 0; | |
224 | break; | |
225 | case IPV6_ADDR_COMPATv4: | |
226 | if (prefixlen != 96) | |
227 | addrtype = 0; | |
228 | break; | |
229 | case IPV6_ADDR_LOOPBACK: | |
230 | if (prefixlen != 128) | |
231 | addrtype = 0; | |
232 | break; | |
233 | } | |
234 | ||
235 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); | |
236 | if (!newp) | |
237 | return ERR_PTR(-ENOMEM); | |
238 | ||
239 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); | |
240 | newp->prefixlen = prefixlen; | |
241 | newp->ifindex = ifindex; | |
242 | newp->addrtype = addrtype; | |
243 | newp->label = label; | |
244 | INIT_HLIST_NODE(&newp->list); | |
3de23255 BT |
245 | #ifdef CONFIG_NET_NS |
246 | newp->lbl_net = hold_net(net); | |
247 | #endif | |
2a8cc6c8 YH |
248 | atomic_set(&newp->refcnt, 1); |
249 | return newp; | |
250 | } | |
251 | ||
252 | /* add a label */ | |
40fee36e | 253 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
2a8cc6c8 YH |
254 | { |
255 | int ret = 0; | |
256 | ||
257 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", | |
0dc47877 | 258 | __func__, |
2a8cc6c8 YH |
259 | newp, replace); |
260 | ||
261 | if (hlist_empty(&ip6addrlbl_table.head)) { | |
262 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
263 | } else { | |
264 | struct hlist_node *pos, *n; | |
265 | struct ip6addrlbl_entry *p = NULL; | |
266 | hlist_for_each_entry_safe(p, pos, n, | |
267 | &ip6addrlbl_table.head, list) { | |
268 | if (p->prefixlen == newp->prefixlen && | |
3de23255 | 269 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && |
2a8cc6c8 YH |
270 | p->ifindex == newp->ifindex && |
271 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { | |
272 | if (!replace) { | |
273 | ret = -EEXIST; | |
274 | goto out; | |
275 | } | |
276 | hlist_replace_rcu(&p->list, &newp->list); | |
277 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
278 | goto out; |
279 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || | |
280 | (p->prefixlen < newp->prefixlen)) { | |
281 | hlist_add_before_rcu(&newp->list, &p->list); | |
282 | goto out; | |
283 | } | |
284 | } | |
285 | hlist_add_after_rcu(&p->list, &newp->list); | |
286 | } | |
287 | out: | |
288 | if (!ret) | |
289 | ip6addrlbl_table.seq++; | |
290 | return ret; | |
291 | } | |
292 | ||
293 | /* add a label */ | |
3de23255 BT |
294 | static int ip6addrlbl_add(struct net *net, |
295 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 296 | int ifindex, u32 label, int replace) |
2a8cc6c8 YH |
297 | { |
298 | struct ip6addrlbl_entry *newp; | |
299 | int ret = 0; | |
300 | ||
5b095d98 | 301 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
0c6ce78a HH |
302 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, |
303 | replace); | |
2a8cc6c8 | 304 | |
3de23255 | 305 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); |
2a8cc6c8 YH |
306 | if (IS_ERR(newp)) |
307 | return PTR_ERR(newp); | |
308 | spin_lock(&ip6addrlbl_table.lock); | |
309 | ret = __ip6addrlbl_add(newp, replace); | |
310 | spin_unlock(&ip6addrlbl_table.lock); | |
311 | if (ret) | |
312 | ip6addrlbl_free(newp); | |
313 | return ret; | |
314 | } | |
315 | ||
316 | /* remove a label */ | |
3de23255 BT |
317 | static int __ip6addrlbl_del(struct net *net, |
318 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 319 | int ifindex) |
2a8cc6c8 YH |
320 | { |
321 | struct ip6addrlbl_entry *p = NULL; | |
322 | struct hlist_node *pos, *n; | |
323 | int ret = -ESRCH; | |
324 | ||
5b095d98 | 325 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 326 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
327 | |
328 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
329 | if (p->prefixlen == prefixlen && | |
3de23255 | 330 | net_eq(ip6addrlbl_net(p), net) && |
2a8cc6c8 YH |
331 | p->ifindex == ifindex && |
332 | ipv6_addr_equal(&p->prefix, prefix)) { | |
333 | hlist_del_rcu(&p->list); | |
334 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
335 | ret = 0; |
336 | break; | |
337 | } | |
338 | } | |
339 | return ret; | |
340 | } | |
341 | ||
3de23255 BT |
342 | static int ip6addrlbl_del(struct net *net, |
343 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 344 | int ifindex) |
2a8cc6c8 YH |
345 | { |
346 | struct in6_addr prefix_buf; | |
347 | int ret; | |
348 | ||
5b095d98 | 349 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 350 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
351 | |
352 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
353 | spin_lock(&ip6addrlbl_table.lock); | |
3de23255 | 354 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
2a8cc6c8 YH |
355 | spin_unlock(&ip6addrlbl_table.lock); |
356 | return ret; | |
357 | } | |
358 | ||
359 | /* add default label */ | |
3de23255 | 360 | static int __net_init ip6addrlbl_net_init(struct net *net) |
2a8cc6c8 YH |
361 | { |
362 | int err = 0; | |
363 | int i; | |
364 | ||
f3213831 | 365 | ADDRLABEL(KERN_DEBUG "%s\n", __func__); |
2a8cc6c8 YH |
366 | |
367 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
3de23255 BT |
368 | int ret = ip6addrlbl_add(net, |
369 | ip6addrlbl_init_table[i].prefix, | |
2a8cc6c8 YH |
370 | ip6addrlbl_init_table[i].prefixlen, |
371 | 0, | |
372 | ip6addrlbl_init_table[i].label, 0); | |
373 | /* XXX: should we free all rules when we catch an error? */ | |
374 | if (ret && (!err || err != -ENOMEM)) | |
375 | err = ret; | |
376 | } | |
377 | return err; | |
378 | } | |
379 | ||
3de23255 BT |
380 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
381 | { | |
382 | struct ip6addrlbl_entry *p = NULL; | |
383 | struct hlist_node *pos, *n; | |
384 | ||
385 | /* Remove all labels belonging to the exiting net */ | |
386 | spin_lock(&ip6addrlbl_table.lock); | |
387 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { | |
388 | if (net_eq(ip6addrlbl_net(p), net)) { | |
389 | hlist_del_rcu(&p->list); | |
390 | ip6addrlbl_put(p); | |
391 | } | |
392 | } | |
393 | spin_unlock(&ip6addrlbl_table.lock); | |
394 | } | |
395 | ||
396 | static struct pernet_operations ipv6_addr_label_ops = { | |
397 | .init = ip6addrlbl_net_init, | |
398 | .exit = ip6addrlbl_net_exit, | |
399 | }; | |
400 | ||
2a8cc6c8 YH |
401 | int __init ipv6_addr_label_init(void) |
402 | { | |
403 | spin_lock_init(&ip6addrlbl_table.lock); | |
404 | ||
3de23255 | 405 | return register_pernet_subsys(&ipv6_addr_label_ops); |
2a8cc6c8 YH |
406 | } |
407 | ||
2cc6d2bf NH |
408 | void ipv6_addr_label_cleanup(void) |
409 | { | |
410 | unregister_pernet_subsys(&ipv6_addr_label_ops); | |
411 | } | |
412 | ||
2a8cc6c8 YH |
413 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { |
414 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, | |
415 | [IFAL_LABEL] = { .len = sizeof(u32), }, | |
416 | }; | |
417 | ||
418 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, | |
419 | void *arg) | |
420 | { | |
3b1e0a65 | 421 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
422 | struct ifaddrlblmsg *ifal; |
423 | struct nlattr *tb[IFAL_MAX+1]; | |
424 | struct in6_addr *pfx; | |
425 | u32 label; | |
426 | int err = 0; | |
427 | ||
428 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
429 | if (err < 0) | |
430 | return err; | |
431 | ||
432 | ifal = nlmsg_data(nlh); | |
433 | ||
434 | if (ifal->ifal_family != AF_INET6 || | |
435 | ifal->ifal_prefixlen > 128) | |
436 | return -EINVAL; | |
437 | ||
2a8cc6c8 YH |
438 | if (!tb[IFAL_ADDRESS]) |
439 | return -EINVAL; | |
440 | ||
441 | pfx = nla_data(tb[IFAL_ADDRESS]); | |
442 | if (!pfx) | |
443 | return -EINVAL; | |
444 | ||
445 | if (!tb[IFAL_LABEL]) | |
446 | return -EINVAL; | |
447 | label = nla_get_u32(tb[IFAL_LABEL]); | |
448 | if (label == IPV6_ADDR_LABEL_DEFAULT) | |
449 | return -EINVAL; | |
450 | ||
451 | switch(nlh->nlmsg_type) { | |
452 | case RTM_NEWADDRLABEL: | |
0771275b FW |
453 | if (ifal->ifal_index && |
454 | !__dev_get_by_index(net, ifal->ifal_index)) | |
455 | return -EINVAL; | |
456 | ||
3de23255 | 457 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
458 | ifal->ifal_index, label, |
459 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
460 | break; | |
461 | case RTM_DELADDRLABEL: | |
3de23255 | 462 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
463 | ifal->ifal_index); |
464 | break; | |
465 | default: | |
466 | err = -EOPNOTSUPP; | |
467 | } | |
468 | return err; | |
469 | } | |
470 | ||
a50feda5 ED |
471 | static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, |
472 | int prefixlen, int ifindex, u32 lseq) | |
2a8cc6c8 YH |
473 | { |
474 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); | |
475 | ifal->ifal_family = AF_INET6; | |
476 | ifal->ifal_prefixlen = prefixlen; | |
477 | ifal->ifal_flags = 0; | |
478 | ifal->ifal_index = ifindex; | |
479 | ifal->ifal_seq = lseq; | |
480 | }; | |
481 | ||
482 | static int ip6addrlbl_fill(struct sk_buff *skb, | |
483 | struct ip6addrlbl_entry *p, | |
484 | u32 lseq, | |
15e47304 | 485 | u32 portid, u32 seq, int event, |
2a8cc6c8 YH |
486 | unsigned int flags) |
487 | { | |
15e47304 | 488 | struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, |
2a8cc6c8 YH |
489 | sizeof(struct ifaddrlblmsg), flags); |
490 | if (!nlh) | |
491 | return -EMSGSIZE; | |
492 | ||
493 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); | |
494 | ||
495 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || | |
496 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { | |
497 | nlmsg_cancel(skb, nlh); | |
498 | return -EMSGSIZE; | |
499 | } | |
500 | ||
501 | return nlmsg_end(skb, nlh); | |
502 | } | |
503 | ||
504 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
505 | { | |
3b1e0a65 | 506 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
507 | struct ip6addrlbl_entry *p; |
508 | struct hlist_node *pos; | |
509 | int idx = 0, s_idx = cb->args[0]; | |
510 | int err; | |
511 | ||
512 | rcu_read_lock(); | |
513 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { | |
3de23255 BT |
514 | if (idx >= s_idx && |
515 | net_eq(ip6addrlbl_net(p), net)) { | |
2a8cc6c8 YH |
516 | if ((err = ip6addrlbl_fill(skb, p, |
517 | ip6addrlbl_table.seq, | |
15e47304 | 518 | NETLINK_CB(cb->skb).portid, |
2a8cc6c8 YH |
519 | cb->nlh->nlmsg_seq, |
520 | RTM_NEWADDRLABEL, | |
521 | NLM_F_MULTI)) <= 0) | |
522 | break; | |
523 | } | |
524 | idx++; | |
525 | } | |
526 | rcu_read_unlock(); | |
527 | cb->args[0] = idx; | |
528 | return skb->len; | |
529 | } | |
530 | ||
531 | static inline int ip6addrlbl_msgsize(void) | |
532 | { | |
a02cec21 | 533 | return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) |
2a8cc6c8 | 534 | + nla_total_size(16) /* IFAL_ADDRESS */ |
a02cec21 | 535 | + nla_total_size(4); /* IFAL_LABEL */ |
2a8cc6c8 YH |
536 | } |
537 | ||
538 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh, | |
539 | void *arg) | |
540 | { | |
3b1e0a65 | 541 | struct net *net = sock_net(in_skb->sk); |
2a8cc6c8 YH |
542 | struct ifaddrlblmsg *ifal; |
543 | struct nlattr *tb[IFAL_MAX+1]; | |
544 | struct in6_addr *addr; | |
545 | u32 lseq; | |
546 | int err = 0; | |
547 | struct ip6addrlbl_entry *p; | |
548 | struct sk_buff *skb; | |
549 | ||
550 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); | |
551 | if (err < 0) | |
552 | return err; | |
553 | ||
554 | ifal = nlmsg_data(nlh); | |
555 | ||
556 | if (ifal->ifal_family != AF_INET6 || | |
557 | ifal->ifal_prefixlen != 128) | |
558 | return -EINVAL; | |
559 | ||
560 | if (ifal->ifal_index && | |
3de23255 | 561 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
562 | return -EINVAL; |
563 | ||
564 | if (!tb[IFAL_ADDRESS]) | |
565 | return -EINVAL; | |
566 | ||
567 | addr = nla_data(tb[IFAL_ADDRESS]); | |
568 | if (!addr) | |
569 | return -EINVAL; | |
570 | ||
571 | rcu_read_lock(); | |
3de23255 | 572 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
2a8cc6c8 YH |
573 | if (p && ip6addrlbl_hold(p)) |
574 | p = NULL; | |
575 | lseq = ip6addrlbl_table.seq; | |
576 | rcu_read_unlock(); | |
577 | ||
578 | if (!p) { | |
579 | err = -ESRCH; | |
580 | goto out; | |
581 | } | |
582 | ||
583 | if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) { | |
584 | ip6addrlbl_put(p); | |
585 | return -ENOBUFS; | |
586 | } | |
587 | ||
588 | err = ip6addrlbl_fill(skb, p, lseq, | |
15e47304 | 589 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
2a8cc6c8 YH |
590 | RTM_NEWADDRLABEL, 0); |
591 | ||
592 | ip6addrlbl_put(p); | |
593 | ||
594 | if (err < 0) { | |
595 | WARN_ON(err == -EMSGSIZE); | |
596 | kfree_skb(skb); | |
597 | goto out; | |
598 | } | |
599 | ||
15e47304 | 600 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
2a8cc6c8 YH |
601 | out: |
602 | return err; | |
603 | } | |
604 | ||
605 | void __init ipv6_addr_label_rtnl_register(void) | |
606 | { | |
c7ac8679 GR |
607 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, |
608 | NULL, NULL); | |
609 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, | |
610 | NULL, NULL); | |
611 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, | |
612 | ip6addrlbl_dump, NULL); | |
2a8cc6c8 YH |
613 | } |
614 |