]>
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: | |
1c8669e0 | 9 | * YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org> |
2a8cc6c8 YH |
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 | |
1c8669e0 | 25 | #define ADDRLABEL(x...) do { ; } while (0) |
2a8cc6c8 YH |
26 | #endif |
27 | ||
28 | /* | |
29 | * Policy Table | |
30 | */ | |
22b285d6 | 31 | struct ip6addrlbl_entry { |
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 | { | |
c2d9ba9b | 55 | return read_pnet(&lbl->lbl_net); |
3de23255 BT |
56 | } |
57 | ||
2a8cc6c8 | 58 | /* |
417962a0 | 59 | * Default policy table (RFC6724 + extensions) |
2a8cc6c8 YH |
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) | |
5fe47b8a | 70 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) |
417962a0 YH |
71 | * fec0::/10 N/A 11 Site-local |
72 | * (deprecated by RFC3879) | |
73 | * 3ffe::/16 N/A 12 6bone | |
2a8cc6c8 YH |
74 | * |
75 | * Note: 0xffffffff is used if we do not have any policies. | |
417962a0 | 76 | * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724. |
2a8cc6c8 YH |
77 | */ |
78 | ||
79 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL | |
80 | ||
04a6f82c | 81 | static const __net_initconst 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, | |
1c8669e0 WY |
90 | }, { /* fc00::/7 */ |
91 | .prefix = &(struct in6_addr){ { { 0xfc } } } , | |
2a8cc6c8 YH |
92 | .prefixlen = 7, |
93 | .label = 5, | |
1c8669e0 WY |
94 | }, { /* fec0::/10 */ |
95 | .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } }, | |
417962a0 YH |
96 | .prefixlen = 10, |
97 | .label = 11, | |
1c8669e0 WY |
98 | }, { /* 2002::/16 */ |
99 | .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } }, | |
2a8cc6c8 YH |
100 | .prefixlen = 16, |
101 | .label = 2, | |
1c8669e0 WY |
102 | }, { /* 3ffe::/16 */ |
103 | .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } }, | |
417962a0 YH |
104 | .prefixlen = 16, |
105 | .label = 12, | |
1c8669e0 WY |
106 | }, { /* 2001::/32 */ |
107 | .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } }, | |
2a8cc6c8 YH |
108 | .prefixlen = 32, |
109 | .label = 6, | |
1c8669e0 WY |
110 | }, { /* 2001:10::/28 */ |
111 | .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } }, | |
5fe47b8a JMT |
112 | .prefixlen = 28, |
113 | .label = 7, | |
1c8669e0 WY |
114 | }, { /* ::ffff:0:0 */ |
115 | .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } }, | |
2a8cc6c8 YH |
116 | .prefixlen = 96, |
117 | .label = 4, | |
1c8669e0 | 118 | }, { /* ::/96 */ |
2a8cc6c8 YH |
119 | .prefix = &in6addr_any, |
120 | .prefixlen = 96, | |
121 | .label = 3, | |
1c8669e0 | 122 | }, { /* ::1/128 */ |
2a8cc6c8 YH |
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 | { | |
3de23255 BT |
132 | #ifdef CONFIG_NET_NS |
133 | release_net(p->lbl_net); | |
134 | #endif | |
2a8cc6c8 YH |
135 | kfree(p); |
136 | } | |
137 | ||
85040bcb YH |
138 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
139 | { | |
140 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); | |
141 | } | |
142 | ||
a50feda5 | 143 | static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
2a8cc6c8 YH |
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)) | |
85040bcb | 151 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
2a8cc6c8 YH |
152 | } |
153 | ||
154 | /* Find label */ | |
a50feda5 ED |
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) | |
2a8cc6c8 | 159 | { |
3de23255 | 160 | if (!net_eq(ip6addrlbl_net(p), net)) |
a50feda5 | 161 | return false; |
2a8cc6c8 | 162 | if (p->ifindex && p->ifindex != ifindex) |
a50feda5 | 163 | return false; |
2a8cc6c8 | 164 | if (p->addrtype && p->addrtype != addrtype) |
a50feda5 | 165 | return false; |
2a8cc6c8 | 166 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) |
a50feda5 ED |
167 | return false; |
168 | return true; | |
2a8cc6c8 YH |
169 | } |
170 | ||
3de23255 BT |
171 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, |
172 | const struct in6_addr *addr, | |
2a8cc6c8 YH |
173 | int type, int ifindex) |
174 | { | |
2a8cc6c8 | 175 | struct ip6addrlbl_entry *p; |
b67bfe0d | 176 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { |
3de23255 | 177 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
2a8cc6c8 YH |
178 | return p; |
179 | } | |
180 | return NULL; | |
181 | } | |
182 | ||
3de23255 BT |
183 | u32 ipv6_addr_label(struct net *net, |
184 | const struct in6_addr *addr, int type, int ifindex) | |
2a8cc6c8 YH |
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(); | |
3de23255 | 192 | p = __ipv6_addr_label(net, addr, type, ifindex); |
2a8cc6c8 YH |
193 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
194 | rcu_read_unlock(); | |
195 | ||
5b095d98 | 196 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", |
0c6ce78a | 197 | __func__, addr, type, ifindex, label); |
2a8cc6c8 YH |
198 | |
199 | return label; | |
200 | } | |
201 | ||
202 | /* allocate one entry */ | |
3de23255 BT |
203 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
204 | const struct in6_addr *prefix, | |
40fee36e YH |
205 | int prefixlen, int ifindex, |
206 | u32 label) | |
2a8cc6c8 YH |
207 | { |
208 | struct ip6addrlbl_entry *newp; | |
209 | int addrtype; | |
210 | ||
5b095d98 | 211 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", |
0c6ce78a | 212 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); |
2a8cc6c8 YH |
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); | |
3de23255 BT |
243 | #ifdef CONFIG_NET_NS |
244 | newp->lbl_net = hold_net(net); | |
245 | #endif | |
2a8cc6c8 YH |
246 | atomic_set(&newp->refcnt, 1); |
247 | return newp; | |
248 | } | |
249 | ||
250 | /* add a label */ | |
40fee36e | 251 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
2a8cc6c8 | 252 | { |
639739b5 HFS |
253 | struct hlist_node *n; |
254 | struct ip6addrlbl_entry *last = NULL, *p = NULL; | |
2a8cc6c8 YH |
255 | int ret = 0; |
256 | ||
639739b5 HFS |
257 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp, |
258 | replace); | |
2a8cc6c8 | 259 | |
639739b5 HFS |
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; | |
2a8cc6c8 YH |
267 | goto out; |
268 | } | |
639739b5 HFS |
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; | |
2a8cc6c8 | 276 | } |
639739b5 | 277 | last = p; |
2a8cc6c8 | 278 | } |
639739b5 | 279 | if (last) |
1d023284 | 280 | hlist_add_behind_rcu(&newp->list, &last->list); |
639739b5 HFS |
281 | else |
282 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); | |
2a8cc6c8 YH |
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 | ||
5b095d98 | 297 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
0c6ce78a HH |
298 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, |
299 | replace); | |
2a8cc6c8 | 300 | |
3de23255 | 301 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); |
2a8cc6c8 YH |
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 */ | |
3de23255 BT |
313 | static int __ip6addrlbl_del(struct net *net, |
314 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 315 | int ifindex) |
2a8cc6c8 YH |
316 | { |
317 | struct ip6addrlbl_entry *p = NULL; | |
b67bfe0d | 318 | struct hlist_node *n; |
2a8cc6c8 YH |
319 | int ret = -ESRCH; |
320 | ||
5b095d98 | 321 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 322 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 | 323 | |
b67bfe0d | 324 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
2a8cc6c8 | 325 | if (p->prefixlen == prefixlen && |
3de23255 | 326 | net_eq(ip6addrlbl_net(p), net) && |
2a8cc6c8 YH |
327 | p->ifindex == ifindex && |
328 | ipv6_addr_equal(&p->prefix, prefix)) { | |
329 | hlist_del_rcu(&p->list); | |
330 | ip6addrlbl_put(p); | |
2a8cc6c8 YH |
331 | ret = 0; |
332 | break; | |
333 | } | |
334 | } | |
335 | return ret; | |
336 | } | |
337 | ||
3de23255 BT |
338 | static int ip6addrlbl_del(struct net *net, |
339 | const struct in6_addr *prefix, int prefixlen, | |
40fee36e | 340 | int ifindex) |
2a8cc6c8 YH |
341 | { |
342 | struct in6_addr prefix_buf; | |
343 | int ret; | |
344 | ||
5b095d98 | 345 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
0c6ce78a | 346 | __func__, prefix, prefixlen, ifindex); |
2a8cc6c8 YH |
347 | |
348 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); | |
349 | spin_lock(&ip6addrlbl_table.lock); | |
3de23255 | 350 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
2a8cc6c8 YH |
351 | spin_unlock(&ip6addrlbl_table.lock); |
352 | return ret; | |
353 | } | |
354 | ||
355 | /* add default label */ | |
3de23255 | 356 | static int __net_init ip6addrlbl_net_init(struct net *net) |
2a8cc6c8 YH |
357 | { |
358 | int err = 0; | |
359 | int i; | |
360 | ||
f3213831 | 361 | ADDRLABEL(KERN_DEBUG "%s\n", __func__); |
2a8cc6c8 YH |
362 | |
363 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { | |
3de23255 BT |
364 | int ret = ip6addrlbl_add(net, |
365 | ip6addrlbl_init_table[i].prefix, | |
2a8cc6c8 YH |
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 | ||
3de23255 BT |
376 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
377 | { | |
378 | struct ip6addrlbl_entry *p = NULL; | |
b67bfe0d | 379 | struct hlist_node *n; |
3de23255 BT |
380 | |
381 | /* Remove all labels belonging to the exiting net */ | |
382 | spin_lock(&ip6addrlbl_table.lock); | |
b67bfe0d | 383 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
3de23255 BT |
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 | ||
2a8cc6c8 YH |
397 | int __init ipv6_addr_label_init(void) |
398 | { | |
399 | spin_lock_init(&ip6addrlbl_table.lock); | |
400 | ||
3de23255 | 401 | return register_pernet_subsys(&ipv6_addr_label_ops); |
2a8cc6c8 YH |
402 | } |
403 | ||
2cc6d2bf NH |
404 | void ipv6_addr_label_cleanup(void) |
405 | { | |
406 | unregister_pernet_subsys(&ipv6_addr_label_ops); | |
407 | } | |
408 | ||
2a8cc6c8 YH |
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 | ||
661d2967 | 414 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh) |
2a8cc6c8 | 415 | { |
3b1e0a65 | 416 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 YH |
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 | ||
2a8cc6c8 YH |
433 | if (!tb[IFAL_ADDRESS]) |
434 | return -EINVAL; | |
2a8cc6c8 | 435 | pfx = nla_data(tb[IFAL_ADDRESS]); |
2a8cc6c8 YH |
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 | ||
1c8669e0 | 443 | switch (nlh->nlmsg_type) { |
2a8cc6c8 | 444 | case RTM_NEWADDRLABEL: |
0771275b FW |
445 | if (ifal->ifal_index && |
446 | !__dev_get_by_index(net, ifal->ifal_index)) | |
447 | return -EINVAL; | |
448 | ||
3de23255 | 449 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
450 | ifal->ifal_index, label, |
451 | nlh->nlmsg_flags & NLM_F_REPLACE); | |
452 | break; | |
453 | case RTM_DELADDRLABEL: | |
3de23255 | 454 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
2a8cc6c8 YH |
455 | ifal->ifal_index); |
456 | break; | |
457 | default: | |
458 | err = -EOPNOTSUPP; | |
459 | } | |
460 | return err; | |
461 | } | |
462 | ||
a50feda5 ED |
463 | static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, |
464 | int prefixlen, int ifindex, u32 lseq) | |
2a8cc6c8 YH |
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, | |
15e47304 | 477 | u32 portid, u32 seq, int event, |
2a8cc6c8 YH |
478 | unsigned int flags) |
479 | { | |
15e47304 | 480 | struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, |
2a8cc6c8 YH |
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 | { | |
3b1e0a65 | 498 | struct net *net = sock_net(skb->sk); |
2a8cc6c8 | 499 | struct ip6addrlbl_entry *p; |
2a8cc6c8 YH |
500 | int idx = 0, s_idx = cb->args[0]; |
501 | int err; | |
502 | ||
503 | rcu_read_lock(); | |
b67bfe0d | 504 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { |
3de23255 BT |
505 | if (idx >= s_idx && |
506 | net_eq(ip6addrlbl_net(p), net)) { | |
cb6e926e WY |
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) | |
2a8cc6c8 YH |
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 | { | |
a02cec21 | 525 | return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) |
2a8cc6c8 | 526 | + nla_total_size(16) /* IFAL_ADDRESS */ |
a02cec21 | 527 | + nla_total_size(4); /* IFAL_LABEL */ |
2a8cc6c8 YH |
528 | } |
529 | ||
22b285d6 | 530 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
2a8cc6c8 | 531 | { |
3b1e0a65 | 532 | struct net *net = sock_net(in_skb->sk); |
2a8cc6c8 YH |
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 && | |
3de23255 | 552 | !__dev_get_by_index(net, ifal->ifal_index)) |
2a8cc6c8 YH |
553 | return -EINVAL; |
554 | ||
555 | if (!tb[IFAL_ADDRESS]) | |
556 | return -EINVAL; | |
2a8cc6c8 | 557 | addr = nla_data(tb[IFAL_ADDRESS]); |
2a8cc6c8 YH |
558 | |
559 | rcu_read_lock(); | |
3de23255 | 560 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
2a8cc6c8 YH |
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 | ||
cb6e926e WY |
571 | skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL); |
572 | if (!skb) { | |
2a8cc6c8 YH |
573 | ip6addrlbl_put(p); |
574 | return -ENOBUFS; | |
575 | } | |
576 | ||
577 | err = ip6addrlbl_fill(skb, p, lseq, | |
15e47304 | 578 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
2a8cc6c8 YH |
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 | ||
15e47304 | 589 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
2a8cc6c8 YH |
590 | out: |
591 | return err; | |
592 | } | |
593 | ||
594 | void __init ipv6_addr_label_rtnl_register(void) | |
595 | { | |
c7ac8679 GR |
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); | |
2a8cc6c8 YH |
602 | } |
603 |