| 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 | { |
| 32 | struct in6_addr prefix; |
| 33 | int prefixlen; |
| 34 | int ifindex; |
| 35 | int addrtype; |
| 36 | u32 label; |
| 37 | struct hlist_node list; |
| 38 | atomic_t refcnt; |
| 39 | struct rcu_head rcu; |
| 40 | }; |
| 41 | |
| 42 | static struct ip6addrlbl_table |
| 43 | { |
| 44 | struct hlist_head head; |
| 45 | spinlock_t lock; |
| 46 | u32 seq; |
| 47 | } ip6addrlbl_table; |
| 48 | |
| 49 | /* |
| 50 | * Default policy table (RFC3484 + extensions) |
| 51 | * |
| 52 | * prefix addr_type label |
| 53 | * ------------------------------------------------------------------------- |
| 54 | * ::1/128 LOOPBACK 0 |
| 55 | * ::/0 N/A 1 |
| 56 | * 2002::/16 N/A 2 |
| 57 | * ::/96 COMPATv4 3 |
| 58 | * ::ffff:0:0/96 V4MAPPED 4 |
| 59 | * fc00::/7 N/A 5 ULA (RFC 4193) |
| 60 | * 2001::/32 N/A 6 Teredo (RFC 4380) |
| 61 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) |
| 62 | * |
| 63 | * Note: 0xffffffff is used if we do not have any policies. |
| 64 | */ |
| 65 | |
| 66 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL |
| 67 | |
| 68 | static const __initdata struct ip6addrlbl_init_table |
| 69 | { |
| 70 | const struct in6_addr *prefix; |
| 71 | int prefixlen; |
| 72 | u32 label; |
| 73 | } ip6addrlbl_init_table[] = { |
| 74 | { /* ::/0 */ |
| 75 | .prefix = &in6addr_any, |
| 76 | .label = 1, |
| 77 | },{ /* fc00::/7 */ |
| 78 | .prefix = &(struct in6_addr){{{ 0xfc }}}, |
| 79 | .prefixlen = 7, |
| 80 | .label = 5, |
| 81 | },{ /* 2002::/16 */ |
| 82 | .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}}, |
| 83 | .prefixlen = 16, |
| 84 | .label = 2, |
| 85 | },{ /* 2001::/32 */ |
| 86 | .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}}, |
| 87 | .prefixlen = 32, |
| 88 | .label = 6, |
| 89 | },{ /* 2001:10::/28 */ |
| 90 | .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}}, |
| 91 | .prefixlen = 28, |
| 92 | .label = 7, |
| 93 | },{ /* ::ffff:0:0 */ |
| 94 | .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}}, |
| 95 | .prefixlen = 96, |
| 96 | .label = 4, |
| 97 | },{ /* ::/96 */ |
| 98 | .prefix = &in6addr_any, |
| 99 | .prefixlen = 96, |
| 100 | .label = 3, |
| 101 | },{ /* ::1/128 */ |
| 102 | .prefix = &in6addr_loopback, |
| 103 | .prefixlen = 128, |
| 104 | .label = 0, |
| 105 | } |
| 106 | }; |
| 107 | |
| 108 | /* Object management */ |
| 109 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) |
| 110 | { |
| 111 | kfree(p); |
| 112 | } |
| 113 | |
| 114 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
| 115 | { |
| 116 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); |
| 117 | } |
| 118 | |
| 119 | static inline int ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
| 120 | { |
| 121 | return atomic_inc_not_zero(&p->refcnt); |
| 122 | } |
| 123 | |
| 124 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) |
| 125 | { |
| 126 | if (atomic_dec_and_test(&p->refcnt)) |
| 127 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
| 128 | } |
| 129 | |
| 130 | /* Find label */ |
| 131 | static int __ip6addrlbl_match(struct ip6addrlbl_entry *p, |
| 132 | const struct in6_addr *addr, |
| 133 | int addrtype, int ifindex) |
| 134 | { |
| 135 | if (p->ifindex && p->ifindex != ifindex) |
| 136 | return 0; |
| 137 | if (p->addrtype && p->addrtype != addrtype) |
| 138 | return 0; |
| 139 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) |
| 140 | return 0; |
| 141 | return 1; |
| 142 | } |
| 143 | |
| 144 | static struct ip6addrlbl_entry *__ipv6_addr_label(const struct in6_addr *addr, |
| 145 | int type, int ifindex) |
| 146 | { |
| 147 | struct hlist_node *pos; |
| 148 | struct ip6addrlbl_entry *p; |
| 149 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { |
| 150 | if (__ip6addrlbl_match(p, addr, type, ifindex)) |
| 151 | return p; |
| 152 | } |
| 153 | return NULL; |
| 154 | } |
| 155 | |
| 156 | u32 ipv6_addr_label(const struct in6_addr *addr, int type, int ifindex) |
| 157 | { |
| 158 | u32 label; |
| 159 | struct ip6addrlbl_entry *p; |
| 160 | |
| 161 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; |
| 162 | |
| 163 | rcu_read_lock(); |
| 164 | p = __ipv6_addr_label(addr, type, ifindex); |
| 165 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
| 166 | rcu_read_unlock(); |
| 167 | |
| 168 | ADDRLABEL(KERN_DEBUG "%s(addr=" NIP6_FMT ", type=%d, ifindex=%d) => %08x\n", |
| 169 | __func__, |
| 170 | NIP6(*addr), type, ifindex, |
| 171 | label); |
| 172 | |
| 173 | return label; |
| 174 | } |
| 175 | |
| 176 | /* allocate one entry */ |
| 177 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix, |
| 178 | int prefixlen, int ifindex, |
| 179 | u32 label) |
| 180 | { |
| 181 | struct ip6addrlbl_entry *newp; |
| 182 | int addrtype; |
| 183 | |
| 184 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d, label=%u)\n", |
| 185 | __func__, |
| 186 | NIP6(*prefix), prefixlen, |
| 187 | ifindex, |
| 188 | (unsigned int)label); |
| 189 | |
| 190 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); |
| 191 | |
| 192 | switch (addrtype) { |
| 193 | case IPV6_ADDR_MAPPED: |
| 194 | if (prefixlen > 96) |
| 195 | return ERR_PTR(-EINVAL); |
| 196 | if (prefixlen < 96) |
| 197 | addrtype = 0; |
| 198 | break; |
| 199 | case IPV6_ADDR_COMPATv4: |
| 200 | if (prefixlen != 96) |
| 201 | addrtype = 0; |
| 202 | break; |
| 203 | case IPV6_ADDR_LOOPBACK: |
| 204 | if (prefixlen != 128) |
| 205 | addrtype = 0; |
| 206 | break; |
| 207 | } |
| 208 | |
| 209 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); |
| 210 | if (!newp) |
| 211 | return ERR_PTR(-ENOMEM); |
| 212 | |
| 213 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); |
| 214 | newp->prefixlen = prefixlen; |
| 215 | newp->ifindex = ifindex; |
| 216 | newp->addrtype = addrtype; |
| 217 | newp->label = label; |
| 218 | INIT_HLIST_NODE(&newp->list); |
| 219 | atomic_set(&newp->refcnt, 1); |
| 220 | return newp; |
| 221 | } |
| 222 | |
| 223 | /* add a label */ |
| 224 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
| 225 | { |
| 226 | int ret = 0; |
| 227 | |
| 228 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", |
| 229 | __func__, |
| 230 | newp, replace); |
| 231 | |
| 232 | if (hlist_empty(&ip6addrlbl_table.head)) { |
| 233 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); |
| 234 | } else { |
| 235 | struct hlist_node *pos, *n; |
| 236 | struct ip6addrlbl_entry *p = NULL; |
| 237 | hlist_for_each_entry_safe(p, pos, n, |
| 238 | &ip6addrlbl_table.head, list) { |
| 239 | if (p->prefixlen == newp->prefixlen && |
| 240 | p->ifindex == newp->ifindex && |
| 241 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { |
| 242 | if (!replace) { |
| 243 | ret = -EEXIST; |
| 244 | goto out; |
| 245 | } |
| 246 | hlist_replace_rcu(&p->list, &newp->list); |
| 247 | ip6addrlbl_put(p); |
| 248 | goto out; |
| 249 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || |
| 250 | (p->prefixlen < newp->prefixlen)) { |
| 251 | hlist_add_before_rcu(&newp->list, &p->list); |
| 252 | goto out; |
| 253 | } |
| 254 | } |
| 255 | hlist_add_after_rcu(&p->list, &newp->list); |
| 256 | } |
| 257 | out: |
| 258 | if (!ret) |
| 259 | ip6addrlbl_table.seq++; |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | /* add a label */ |
| 264 | static int ip6addrlbl_add(const struct in6_addr *prefix, int prefixlen, |
| 265 | int ifindex, u32 label, int replace) |
| 266 | { |
| 267 | struct ip6addrlbl_entry *newp; |
| 268 | int ret = 0; |
| 269 | |
| 270 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
| 271 | __func__, |
| 272 | NIP6(*prefix), prefixlen, |
| 273 | ifindex, |
| 274 | (unsigned int)label, |
| 275 | replace); |
| 276 | |
| 277 | newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label); |
| 278 | if (IS_ERR(newp)) |
| 279 | return PTR_ERR(newp); |
| 280 | spin_lock(&ip6addrlbl_table.lock); |
| 281 | ret = __ip6addrlbl_add(newp, replace); |
| 282 | spin_unlock(&ip6addrlbl_table.lock); |
| 283 | if (ret) |
| 284 | ip6addrlbl_free(newp); |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | /* remove a label */ |
| 289 | static int __ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen, |
| 290 | int ifindex) |
| 291 | { |
| 292 | struct ip6addrlbl_entry *p = NULL; |
| 293 | struct hlist_node *pos, *n; |
| 294 | int ret = -ESRCH; |
| 295 | |
| 296 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d)\n", |
| 297 | __func__, |
| 298 | NIP6(*prefix), prefixlen, |
| 299 | ifindex); |
| 300 | |
| 301 | hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) { |
| 302 | if (p->prefixlen == prefixlen && |
| 303 | p->ifindex == ifindex && |
| 304 | ipv6_addr_equal(&p->prefix, prefix)) { |
| 305 | hlist_del_rcu(&p->list); |
| 306 | ip6addrlbl_put(p); |
| 307 | ret = 0; |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | static int ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen, |
| 315 | int ifindex) |
| 316 | { |
| 317 | struct in6_addr prefix_buf; |
| 318 | int ret; |
| 319 | |
| 320 | ADDRLABEL(KERN_DEBUG "%s(prefix=" NIP6_FMT ", prefixlen=%d, ifindex=%d)\n", |
| 321 | __func__, |
| 322 | NIP6(*prefix), prefixlen, |
| 323 | ifindex); |
| 324 | |
| 325 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); |
| 326 | spin_lock(&ip6addrlbl_table.lock); |
| 327 | ret = __ip6addrlbl_del(&prefix_buf, prefixlen, ifindex); |
| 328 | spin_unlock(&ip6addrlbl_table.lock); |
| 329 | return ret; |
| 330 | } |
| 331 | |
| 332 | /* add default label */ |
| 333 | static __init int ip6addrlbl_init(void) |
| 334 | { |
| 335 | int err = 0; |
| 336 | int i; |
| 337 | |
| 338 | ADDRLABEL(KERN_DEBUG "%s()\n", __func__); |
| 339 | |
| 340 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { |
| 341 | int ret = ip6addrlbl_add(ip6addrlbl_init_table[i].prefix, |
| 342 | ip6addrlbl_init_table[i].prefixlen, |
| 343 | 0, |
| 344 | ip6addrlbl_init_table[i].label, 0); |
| 345 | /* XXX: should we free all rules when we catch an error? */ |
| 346 | if (ret && (!err || err != -ENOMEM)) |
| 347 | err = ret; |
| 348 | } |
| 349 | return err; |
| 350 | } |
| 351 | |
| 352 | int __init ipv6_addr_label_init(void) |
| 353 | { |
| 354 | spin_lock_init(&ip6addrlbl_table.lock); |
| 355 | |
| 356 | return ip6addrlbl_init(); |
| 357 | } |
| 358 | |
| 359 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { |
| 360 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, |
| 361 | [IFAL_LABEL] = { .len = sizeof(u32), }, |
| 362 | }; |
| 363 | |
| 364 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 365 | void *arg) |
| 366 | { |
| 367 | struct net *net = skb->sk->sk_net; |
| 368 | struct ifaddrlblmsg *ifal; |
| 369 | struct nlattr *tb[IFAL_MAX+1]; |
| 370 | struct in6_addr *pfx; |
| 371 | u32 label; |
| 372 | int err = 0; |
| 373 | |
| 374 | if (net != &init_net) |
| 375 | return 0; |
| 376 | |
| 377 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); |
| 378 | if (err < 0) |
| 379 | return err; |
| 380 | |
| 381 | ifal = nlmsg_data(nlh); |
| 382 | |
| 383 | if (ifal->ifal_family != AF_INET6 || |
| 384 | ifal->ifal_prefixlen > 128) |
| 385 | return -EINVAL; |
| 386 | |
| 387 | if (ifal->ifal_index && |
| 388 | !__dev_get_by_index(&init_net, ifal->ifal_index)) |
| 389 | return -EINVAL; |
| 390 | |
| 391 | if (!tb[IFAL_ADDRESS]) |
| 392 | return -EINVAL; |
| 393 | |
| 394 | pfx = nla_data(tb[IFAL_ADDRESS]); |
| 395 | if (!pfx) |
| 396 | return -EINVAL; |
| 397 | |
| 398 | if (!tb[IFAL_LABEL]) |
| 399 | return -EINVAL; |
| 400 | label = nla_get_u32(tb[IFAL_LABEL]); |
| 401 | if (label == IPV6_ADDR_LABEL_DEFAULT) |
| 402 | return -EINVAL; |
| 403 | |
| 404 | switch(nlh->nlmsg_type) { |
| 405 | case RTM_NEWADDRLABEL: |
| 406 | err = ip6addrlbl_add(pfx, ifal->ifal_prefixlen, |
| 407 | ifal->ifal_index, label, |
| 408 | nlh->nlmsg_flags & NLM_F_REPLACE); |
| 409 | break; |
| 410 | case RTM_DELADDRLABEL: |
| 411 | err = ip6addrlbl_del(pfx, ifal->ifal_prefixlen, |
| 412 | ifal->ifal_index); |
| 413 | break; |
| 414 | default: |
| 415 | err = -EOPNOTSUPP; |
| 416 | } |
| 417 | return err; |
| 418 | } |
| 419 | |
| 420 | static inline void ip6addrlbl_putmsg(struct nlmsghdr *nlh, |
| 421 | int prefixlen, int ifindex, u32 lseq) |
| 422 | { |
| 423 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); |
| 424 | ifal->ifal_family = AF_INET6; |
| 425 | ifal->ifal_prefixlen = prefixlen; |
| 426 | ifal->ifal_flags = 0; |
| 427 | ifal->ifal_index = ifindex; |
| 428 | ifal->ifal_seq = lseq; |
| 429 | }; |
| 430 | |
| 431 | static int ip6addrlbl_fill(struct sk_buff *skb, |
| 432 | struct ip6addrlbl_entry *p, |
| 433 | u32 lseq, |
| 434 | u32 pid, u32 seq, int event, |
| 435 | unsigned int flags) |
| 436 | { |
| 437 | struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, event, |
| 438 | sizeof(struct ifaddrlblmsg), flags); |
| 439 | if (!nlh) |
| 440 | return -EMSGSIZE; |
| 441 | |
| 442 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); |
| 443 | |
| 444 | if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 || |
| 445 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { |
| 446 | nlmsg_cancel(skb, nlh); |
| 447 | return -EMSGSIZE; |
| 448 | } |
| 449 | |
| 450 | return nlmsg_end(skb, nlh); |
| 451 | } |
| 452 | |
| 453 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 454 | { |
| 455 | struct net *net = skb->sk->sk_net; |
| 456 | struct ip6addrlbl_entry *p; |
| 457 | struct hlist_node *pos; |
| 458 | int idx = 0, s_idx = cb->args[0]; |
| 459 | int err; |
| 460 | |
| 461 | if (net != &init_net) |
| 462 | return 0; |
| 463 | |
| 464 | rcu_read_lock(); |
| 465 | hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) { |
| 466 | if (idx >= s_idx) { |
| 467 | if ((err = ip6addrlbl_fill(skb, p, |
| 468 | ip6addrlbl_table.seq, |
| 469 | NETLINK_CB(cb->skb).pid, |
| 470 | cb->nlh->nlmsg_seq, |
| 471 | RTM_NEWADDRLABEL, |
| 472 | NLM_F_MULTI)) <= 0) |
| 473 | break; |
| 474 | } |
| 475 | idx++; |
| 476 | } |
| 477 | rcu_read_unlock(); |
| 478 | cb->args[0] = idx; |
| 479 | return skb->len; |
| 480 | } |
| 481 | |
| 482 | static inline int ip6addrlbl_msgsize(void) |
| 483 | { |
| 484 | return (NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) |
| 485 | + nla_total_size(16) /* IFAL_ADDRESS */ |
| 486 | + nla_total_size(4) /* IFAL_LABEL */ |
| 487 | ); |
| 488 | } |
| 489 | |
| 490 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh, |
| 491 | void *arg) |
| 492 | { |
| 493 | struct net *net = in_skb->sk->sk_net; |
| 494 | struct ifaddrlblmsg *ifal; |
| 495 | struct nlattr *tb[IFAL_MAX+1]; |
| 496 | struct in6_addr *addr; |
| 497 | u32 lseq; |
| 498 | int err = 0; |
| 499 | struct ip6addrlbl_entry *p; |
| 500 | struct sk_buff *skb; |
| 501 | |
| 502 | if (net != &init_net) |
| 503 | return 0; |
| 504 | |
| 505 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); |
| 506 | if (err < 0) |
| 507 | return err; |
| 508 | |
| 509 | ifal = nlmsg_data(nlh); |
| 510 | |
| 511 | if (ifal->ifal_family != AF_INET6 || |
| 512 | ifal->ifal_prefixlen != 128) |
| 513 | return -EINVAL; |
| 514 | |
| 515 | if (ifal->ifal_index && |
| 516 | !__dev_get_by_index(&init_net, ifal->ifal_index)) |
| 517 | return -EINVAL; |
| 518 | |
| 519 | if (!tb[IFAL_ADDRESS]) |
| 520 | return -EINVAL; |
| 521 | |
| 522 | addr = nla_data(tb[IFAL_ADDRESS]); |
| 523 | if (!addr) |
| 524 | return -EINVAL; |
| 525 | |
| 526 | rcu_read_lock(); |
| 527 | p = __ipv6_addr_label(addr, ipv6_addr_type(addr), ifal->ifal_index); |
| 528 | if (p && ip6addrlbl_hold(p)) |
| 529 | p = NULL; |
| 530 | lseq = ip6addrlbl_table.seq; |
| 531 | rcu_read_unlock(); |
| 532 | |
| 533 | if (!p) { |
| 534 | err = -ESRCH; |
| 535 | goto out; |
| 536 | } |
| 537 | |
| 538 | if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) { |
| 539 | ip6addrlbl_put(p); |
| 540 | return -ENOBUFS; |
| 541 | } |
| 542 | |
| 543 | err = ip6addrlbl_fill(skb, p, lseq, |
| 544 | NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
| 545 | RTM_NEWADDRLABEL, 0); |
| 546 | |
| 547 | ip6addrlbl_put(p); |
| 548 | |
| 549 | if (err < 0) { |
| 550 | WARN_ON(err == -EMSGSIZE); |
| 551 | kfree_skb(skb); |
| 552 | goto out; |
| 553 | } |
| 554 | |
| 555 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
| 556 | out: |
| 557 | return err; |
| 558 | } |
| 559 | |
| 560 | void __init ipv6_addr_label_rtnl_register(void) |
| 561 | { |
| 562 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, NULL); |
| 563 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, NULL); |
| 564 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, ip6addrlbl_dump); |
| 565 | } |
| 566 | |