Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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 <linux/slab.h> |
| 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 | possible_net_t lbl_net; |
| 33 | struct in6_addr prefix; |
| 34 | int prefixlen; |
| 35 | int ifindex; |
| 36 | int addrtype; |
| 37 | u32 label; |
| 38 | struct hlist_node list; |
| 39 | atomic_t refcnt; |
| 40 | struct rcu_head rcu; |
| 41 | }; |
| 42 | |
| 43 | static struct ip6addrlbl_table |
| 44 | { |
| 45 | struct hlist_head head; |
| 46 | spinlock_t lock; |
| 47 | u32 seq; |
| 48 | } ip6addrlbl_table; |
| 49 | |
| 50 | static inline |
| 51 | struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl) |
| 52 | { |
| 53 | return read_pnet(&lbl->lbl_net); |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Default policy table (RFC6724 + extensions) |
| 58 | * |
| 59 | * prefix addr_type label |
| 60 | * ------------------------------------------------------------------------- |
| 61 | * ::1/128 LOOPBACK 0 |
| 62 | * ::/0 N/A 1 |
| 63 | * 2002::/16 N/A 2 |
| 64 | * ::/96 COMPATv4 3 |
| 65 | * ::ffff:0:0/96 V4MAPPED 4 |
| 66 | * fc00::/7 N/A 5 ULA (RFC 4193) |
| 67 | * 2001::/32 N/A 6 Teredo (RFC 4380) |
| 68 | * 2001:10::/28 N/A 7 ORCHID (RFC 4843) |
| 69 | * fec0::/10 N/A 11 Site-local |
| 70 | * (deprecated by RFC3879) |
| 71 | * 3ffe::/16 N/A 12 6bone |
| 72 | * |
| 73 | * Note: 0xffffffff is used if we do not have any policies. |
| 74 | * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724. |
| 75 | */ |
| 76 | |
| 77 | #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL |
| 78 | |
| 79 | static const __net_initconst struct ip6addrlbl_init_table |
| 80 | { |
| 81 | const struct in6_addr *prefix; |
| 82 | int prefixlen; |
| 83 | u32 label; |
| 84 | } ip6addrlbl_init_table[] = { |
| 85 | { /* ::/0 */ |
| 86 | .prefix = &in6addr_any, |
| 87 | .label = 1, |
| 88 | }, { /* fc00::/7 */ |
| 89 | .prefix = &(struct in6_addr){ { { 0xfc } } } , |
| 90 | .prefixlen = 7, |
| 91 | .label = 5, |
| 92 | }, { /* fec0::/10 */ |
| 93 | .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } }, |
| 94 | .prefixlen = 10, |
| 95 | .label = 11, |
| 96 | }, { /* 2002::/16 */ |
| 97 | .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } }, |
| 98 | .prefixlen = 16, |
| 99 | .label = 2, |
| 100 | }, { /* 3ffe::/16 */ |
| 101 | .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } }, |
| 102 | .prefixlen = 16, |
| 103 | .label = 12, |
| 104 | }, { /* 2001::/32 */ |
| 105 | .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } }, |
| 106 | .prefixlen = 32, |
| 107 | .label = 6, |
| 108 | }, { /* 2001:10::/28 */ |
| 109 | .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } }, |
| 110 | .prefixlen = 28, |
| 111 | .label = 7, |
| 112 | }, { /* ::ffff:0:0 */ |
| 113 | .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } }, |
| 114 | .prefixlen = 96, |
| 115 | .label = 4, |
| 116 | }, { /* ::/96 */ |
| 117 | .prefix = &in6addr_any, |
| 118 | .prefixlen = 96, |
| 119 | .label = 3, |
| 120 | }, { /* ::1/128 */ |
| 121 | .prefix = &in6addr_loopback, |
| 122 | .prefixlen = 128, |
| 123 | .label = 0, |
| 124 | } |
| 125 | }; |
| 126 | |
| 127 | /* Object management */ |
| 128 | static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p) |
| 129 | { |
| 130 | kfree(p); |
| 131 | } |
| 132 | |
| 133 | static void ip6addrlbl_free_rcu(struct rcu_head *h) |
| 134 | { |
| 135 | ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu)); |
| 136 | } |
| 137 | |
| 138 | static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p) |
| 139 | { |
| 140 | return atomic_inc_not_zero(&p->refcnt); |
| 141 | } |
| 142 | |
| 143 | static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p) |
| 144 | { |
| 145 | if (atomic_dec_and_test(&p->refcnt)) |
| 146 | call_rcu(&p->rcu, ip6addrlbl_free_rcu); |
| 147 | } |
| 148 | |
| 149 | /* Find label */ |
| 150 | static bool __ip6addrlbl_match(struct net *net, |
| 151 | const struct ip6addrlbl_entry *p, |
| 152 | const struct in6_addr *addr, |
| 153 | int addrtype, int ifindex) |
| 154 | { |
| 155 | if (!net_eq(ip6addrlbl_net(p), net)) |
| 156 | return false; |
| 157 | if (p->ifindex && p->ifindex != ifindex) |
| 158 | return false; |
| 159 | if (p->addrtype && p->addrtype != addrtype) |
| 160 | return false; |
| 161 | if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen)) |
| 162 | return false; |
| 163 | return true; |
| 164 | } |
| 165 | |
| 166 | static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net, |
| 167 | const struct in6_addr *addr, |
| 168 | int type, int ifindex) |
| 169 | { |
| 170 | struct ip6addrlbl_entry *p; |
| 171 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { |
| 172 | if (__ip6addrlbl_match(net, p, addr, type, ifindex)) |
| 173 | return p; |
| 174 | } |
| 175 | return NULL; |
| 176 | } |
| 177 | |
| 178 | u32 ipv6_addr_label(struct net *net, |
| 179 | const struct in6_addr *addr, int type, int ifindex) |
| 180 | { |
| 181 | u32 label; |
| 182 | struct ip6addrlbl_entry *p; |
| 183 | |
| 184 | type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK; |
| 185 | |
| 186 | rcu_read_lock(); |
| 187 | p = __ipv6_addr_label(net, addr, type, ifindex); |
| 188 | label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT; |
| 189 | rcu_read_unlock(); |
| 190 | |
| 191 | ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n", |
| 192 | __func__, addr, type, ifindex, label); |
| 193 | |
| 194 | return label; |
| 195 | } |
| 196 | |
| 197 | /* allocate one entry */ |
| 198 | static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net, |
| 199 | const struct in6_addr *prefix, |
| 200 | int prefixlen, int ifindex, |
| 201 | u32 label) |
| 202 | { |
| 203 | struct ip6addrlbl_entry *newp; |
| 204 | int addrtype; |
| 205 | |
| 206 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n", |
| 207 | __func__, prefix, prefixlen, ifindex, (unsigned int)label); |
| 208 | |
| 209 | addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK); |
| 210 | |
| 211 | switch (addrtype) { |
| 212 | case IPV6_ADDR_MAPPED: |
| 213 | if (prefixlen > 96) |
| 214 | return ERR_PTR(-EINVAL); |
| 215 | if (prefixlen < 96) |
| 216 | addrtype = 0; |
| 217 | break; |
| 218 | case IPV6_ADDR_COMPATv4: |
| 219 | if (prefixlen != 96) |
| 220 | addrtype = 0; |
| 221 | break; |
| 222 | case IPV6_ADDR_LOOPBACK: |
| 223 | if (prefixlen != 128) |
| 224 | addrtype = 0; |
| 225 | break; |
| 226 | } |
| 227 | |
| 228 | newp = kmalloc(sizeof(*newp), GFP_KERNEL); |
| 229 | if (!newp) |
| 230 | return ERR_PTR(-ENOMEM); |
| 231 | |
| 232 | ipv6_addr_prefix(&newp->prefix, prefix, prefixlen); |
| 233 | newp->prefixlen = prefixlen; |
| 234 | newp->ifindex = ifindex; |
| 235 | newp->addrtype = addrtype; |
| 236 | newp->label = label; |
| 237 | INIT_HLIST_NODE(&newp->list); |
| 238 | write_pnet(&newp->lbl_net, net); |
| 239 | atomic_set(&newp->refcnt, 1); |
| 240 | return newp; |
| 241 | } |
| 242 | |
| 243 | /* add a label */ |
| 244 | static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace) |
| 245 | { |
| 246 | struct hlist_node *n; |
| 247 | struct ip6addrlbl_entry *last = NULL, *p = NULL; |
| 248 | int ret = 0; |
| 249 | |
| 250 | ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp, |
| 251 | replace); |
| 252 | |
| 253 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
| 254 | if (p->prefixlen == newp->prefixlen && |
| 255 | net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) && |
| 256 | p->ifindex == newp->ifindex && |
| 257 | ipv6_addr_equal(&p->prefix, &newp->prefix)) { |
| 258 | if (!replace) { |
| 259 | ret = -EEXIST; |
| 260 | goto out; |
| 261 | } |
| 262 | hlist_replace_rcu(&p->list, &newp->list); |
| 263 | ip6addrlbl_put(p); |
| 264 | goto out; |
| 265 | } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) || |
| 266 | (p->prefixlen < newp->prefixlen)) { |
| 267 | hlist_add_before_rcu(&newp->list, &p->list); |
| 268 | goto out; |
| 269 | } |
| 270 | last = p; |
| 271 | } |
| 272 | if (last) |
| 273 | hlist_add_behind_rcu(&newp->list, &last->list); |
| 274 | else |
| 275 | hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head); |
| 276 | out: |
| 277 | if (!ret) |
| 278 | ip6addrlbl_table.seq++; |
| 279 | return ret; |
| 280 | } |
| 281 | |
| 282 | /* add a label */ |
| 283 | static int ip6addrlbl_add(struct net *net, |
| 284 | const struct in6_addr *prefix, int prefixlen, |
| 285 | int ifindex, u32 label, int replace) |
| 286 | { |
| 287 | struct ip6addrlbl_entry *newp; |
| 288 | int ret = 0; |
| 289 | |
| 290 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n", |
| 291 | __func__, prefix, prefixlen, ifindex, (unsigned int)label, |
| 292 | replace); |
| 293 | |
| 294 | newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label); |
| 295 | if (IS_ERR(newp)) |
| 296 | return PTR_ERR(newp); |
| 297 | spin_lock(&ip6addrlbl_table.lock); |
| 298 | ret = __ip6addrlbl_add(newp, replace); |
| 299 | spin_unlock(&ip6addrlbl_table.lock); |
| 300 | if (ret) |
| 301 | ip6addrlbl_free(newp); |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | /* remove a label */ |
| 306 | static int __ip6addrlbl_del(struct net *net, |
| 307 | const struct in6_addr *prefix, int prefixlen, |
| 308 | int ifindex) |
| 309 | { |
| 310 | struct ip6addrlbl_entry *p = NULL; |
| 311 | struct hlist_node *n; |
| 312 | int ret = -ESRCH; |
| 313 | |
| 314 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
| 315 | __func__, prefix, prefixlen, ifindex); |
| 316 | |
| 317 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
| 318 | if (p->prefixlen == prefixlen && |
| 319 | net_eq(ip6addrlbl_net(p), net) && |
| 320 | p->ifindex == ifindex && |
| 321 | ipv6_addr_equal(&p->prefix, prefix)) { |
| 322 | hlist_del_rcu(&p->list); |
| 323 | ip6addrlbl_put(p); |
| 324 | ret = 0; |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | return ret; |
| 329 | } |
| 330 | |
| 331 | static int ip6addrlbl_del(struct net *net, |
| 332 | const struct in6_addr *prefix, int prefixlen, |
| 333 | int ifindex) |
| 334 | { |
| 335 | struct in6_addr prefix_buf; |
| 336 | int ret; |
| 337 | |
| 338 | ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n", |
| 339 | __func__, prefix, prefixlen, ifindex); |
| 340 | |
| 341 | ipv6_addr_prefix(&prefix_buf, prefix, prefixlen); |
| 342 | spin_lock(&ip6addrlbl_table.lock); |
| 343 | ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex); |
| 344 | spin_unlock(&ip6addrlbl_table.lock); |
| 345 | return ret; |
| 346 | } |
| 347 | |
| 348 | /* add default label */ |
| 349 | static int __net_init ip6addrlbl_net_init(struct net *net) |
| 350 | { |
| 351 | int err = 0; |
| 352 | int i; |
| 353 | |
| 354 | ADDRLABEL(KERN_DEBUG "%s\n", __func__); |
| 355 | |
| 356 | for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) { |
| 357 | int ret = ip6addrlbl_add(net, |
| 358 | ip6addrlbl_init_table[i].prefix, |
| 359 | ip6addrlbl_init_table[i].prefixlen, |
| 360 | 0, |
| 361 | ip6addrlbl_init_table[i].label, 0); |
| 362 | /* XXX: should we free all rules when we catch an error? */ |
| 363 | if (ret && (!err || err != -ENOMEM)) |
| 364 | err = ret; |
| 365 | } |
| 366 | return err; |
| 367 | } |
| 368 | |
| 369 | static void __net_exit ip6addrlbl_net_exit(struct net *net) |
| 370 | { |
| 371 | struct ip6addrlbl_entry *p = NULL; |
| 372 | struct hlist_node *n; |
| 373 | |
| 374 | /* Remove all labels belonging to the exiting net */ |
| 375 | spin_lock(&ip6addrlbl_table.lock); |
| 376 | hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) { |
| 377 | if (net_eq(ip6addrlbl_net(p), net)) { |
| 378 | hlist_del_rcu(&p->list); |
| 379 | ip6addrlbl_put(p); |
| 380 | } |
| 381 | } |
| 382 | spin_unlock(&ip6addrlbl_table.lock); |
| 383 | } |
| 384 | |
| 385 | static struct pernet_operations ipv6_addr_label_ops = { |
| 386 | .init = ip6addrlbl_net_init, |
| 387 | .exit = ip6addrlbl_net_exit, |
| 388 | }; |
| 389 | |
| 390 | int __init ipv6_addr_label_init(void) |
| 391 | { |
| 392 | spin_lock_init(&ip6addrlbl_table.lock); |
| 393 | |
| 394 | return register_pernet_subsys(&ipv6_addr_label_ops); |
| 395 | } |
| 396 | |
| 397 | void ipv6_addr_label_cleanup(void) |
| 398 | { |
| 399 | unregister_pernet_subsys(&ipv6_addr_label_ops); |
| 400 | } |
| 401 | |
| 402 | static const struct nla_policy ifal_policy[IFAL_MAX+1] = { |
| 403 | [IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), }, |
| 404 | [IFAL_LABEL] = { .len = sizeof(u32), }, |
| 405 | }; |
| 406 | |
| 407 | static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 408 | { |
| 409 | struct net *net = sock_net(skb->sk); |
| 410 | struct ifaddrlblmsg *ifal; |
| 411 | struct nlattr *tb[IFAL_MAX+1]; |
| 412 | struct in6_addr *pfx; |
| 413 | u32 label; |
| 414 | int err = 0; |
| 415 | |
| 416 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); |
| 417 | if (err < 0) |
| 418 | return err; |
| 419 | |
| 420 | ifal = nlmsg_data(nlh); |
| 421 | |
| 422 | if (ifal->ifal_family != AF_INET6 || |
| 423 | ifal->ifal_prefixlen > 128) |
| 424 | return -EINVAL; |
| 425 | |
| 426 | if (!tb[IFAL_ADDRESS]) |
| 427 | return -EINVAL; |
| 428 | pfx = nla_data(tb[IFAL_ADDRESS]); |
| 429 | |
| 430 | if (!tb[IFAL_LABEL]) |
| 431 | return -EINVAL; |
| 432 | label = nla_get_u32(tb[IFAL_LABEL]); |
| 433 | if (label == IPV6_ADDR_LABEL_DEFAULT) |
| 434 | return -EINVAL; |
| 435 | |
| 436 | switch (nlh->nlmsg_type) { |
| 437 | case RTM_NEWADDRLABEL: |
| 438 | if (ifal->ifal_index && |
| 439 | !__dev_get_by_index(net, ifal->ifal_index)) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen, |
| 443 | ifal->ifal_index, label, |
| 444 | nlh->nlmsg_flags & NLM_F_REPLACE); |
| 445 | break; |
| 446 | case RTM_DELADDRLABEL: |
| 447 | err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen, |
| 448 | ifal->ifal_index); |
| 449 | break; |
| 450 | default: |
| 451 | err = -EOPNOTSUPP; |
| 452 | } |
| 453 | return err; |
| 454 | } |
| 455 | |
| 456 | static void ip6addrlbl_putmsg(struct nlmsghdr *nlh, |
| 457 | int prefixlen, int ifindex, u32 lseq) |
| 458 | { |
| 459 | struct ifaddrlblmsg *ifal = nlmsg_data(nlh); |
| 460 | ifal->ifal_family = AF_INET6; |
| 461 | ifal->ifal_prefixlen = prefixlen; |
| 462 | ifal->ifal_flags = 0; |
| 463 | ifal->ifal_index = ifindex; |
| 464 | ifal->ifal_seq = lseq; |
| 465 | }; |
| 466 | |
| 467 | static int ip6addrlbl_fill(struct sk_buff *skb, |
| 468 | struct ip6addrlbl_entry *p, |
| 469 | u32 lseq, |
| 470 | u32 portid, u32 seq, int event, |
| 471 | unsigned int flags) |
| 472 | { |
| 473 | struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event, |
| 474 | sizeof(struct ifaddrlblmsg), flags); |
| 475 | if (!nlh) |
| 476 | return -EMSGSIZE; |
| 477 | |
| 478 | ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq); |
| 479 | |
| 480 | if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 || |
| 481 | nla_put_u32(skb, IFAL_LABEL, p->label) < 0) { |
| 482 | nlmsg_cancel(skb, nlh); |
| 483 | return -EMSGSIZE; |
| 484 | } |
| 485 | |
| 486 | nlmsg_end(skb, nlh); |
| 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 491 | { |
| 492 | struct net *net = sock_net(skb->sk); |
| 493 | struct ip6addrlbl_entry *p; |
| 494 | int idx = 0, s_idx = cb->args[0]; |
| 495 | int err; |
| 496 | |
| 497 | rcu_read_lock(); |
| 498 | hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) { |
| 499 | if (idx >= s_idx && |
| 500 | net_eq(ip6addrlbl_net(p), net)) { |
| 501 | err = ip6addrlbl_fill(skb, p, |
| 502 | ip6addrlbl_table.seq, |
| 503 | NETLINK_CB(cb->skb).portid, |
| 504 | cb->nlh->nlmsg_seq, |
| 505 | RTM_NEWADDRLABEL, |
| 506 | NLM_F_MULTI); |
| 507 | if (err < 0) |
| 508 | break; |
| 509 | } |
| 510 | idx++; |
| 511 | } |
| 512 | rcu_read_unlock(); |
| 513 | cb->args[0] = idx; |
| 514 | return skb->len; |
| 515 | } |
| 516 | |
| 517 | static inline int ip6addrlbl_msgsize(void) |
| 518 | { |
| 519 | return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg)) |
| 520 | + nla_total_size(16) /* IFAL_ADDRESS */ |
| 521 | + nla_total_size(4); /* IFAL_LABEL */ |
| 522 | } |
| 523 | |
| 524 | static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
| 525 | { |
| 526 | struct net *net = sock_net(in_skb->sk); |
| 527 | struct ifaddrlblmsg *ifal; |
| 528 | struct nlattr *tb[IFAL_MAX+1]; |
| 529 | struct in6_addr *addr; |
| 530 | u32 lseq; |
| 531 | int err = 0; |
| 532 | struct ip6addrlbl_entry *p; |
| 533 | struct sk_buff *skb; |
| 534 | |
| 535 | err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy); |
| 536 | if (err < 0) |
| 537 | return err; |
| 538 | |
| 539 | ifal = nlmsg_data(nlh); |
| 540 | |
| 541 | if (ifal->ifal_family != AF_INET6 || |
| 542 | ifal->ifal_prefixlen != 128) |
| 543 | return -EINVAL; |
| 544 | |
| 545 | if (ifal->ifal_index && |
| 546 | !__dev_get_by_index(net, ifal->ifal_index)) |
| 547 | return -EINVAL; |
| 548 | |
| 549 | if (!tb[IFAL_ADDRESS]) |
| 550 | return -EINVAL; |
| 551 | addr = nla_data(tb[IFAL_ADDRESS]); |
| 552 | |
| 553 | rcu_read_lock(); |
| 554 | p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); |
| 555 | if (p && !ip6addrlbl_hold(p)) |
| 556 | p = NULL; |
| 557 | lseq = ip6addrlbl_table.seq; |
| 558 | rcu_read_unlock(); |
| 559 | |
| 560 | if (!p) { |
| 561 | err = -ESRCH; |
| 562 | goto out; |
| 563 | } |
| 564 | |
| 565 | skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL); |
| 566 | if (!skb) { |
| 567 | ip6addrlbl_put(p); |
| 568 | return -ENOBUFS; |
| 569 | } |
| 570 | |
| 571 | err = ip6addrlbl_fill(skb, p, lseq, |
| 572 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
| 573 | RTM_NEWADDRLABEL, 0); |
| 574 | |
| 575 | ip6addrlbl_put(p); |
| 576 | |
| 577 | if (err < 0) { |
| 578 | WARN_ON(err == -EMSGSIZE); |
| 579 | kfree_skb(skb); |
| 580 | goto out; |
| 581 | } |
| 582 | |
| 583 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
| 584 | out: |
| 585 | return err; |
| 586 | } |
| 587 | |
| 588 | void __init ipv6_addr_label_rtnl_register(void) |
| 589 | { |
| 590 | __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, |
| 591 | NULL, NULL); |
| 592 | __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, |
| 593 | NULL, NULL); |
| 594 | __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, |
| 595 | ip6addrlbl_dump, NULL); |
| 596 | } |
| 597 | |