| 1 | |
| 2 | |
| 3 | * net/core/fib_rules.c Generic Routing Rules
|
| 4 | *
|
| 5 | * Authors: Thomas Graf <[email protected]>
|
| 6 |
|
| 7 |
|
| 8 | #include <linux/types.h>
|
| 9 | #include <linux/kernel.h>
|
| 10 | #include <linux/slab.h>
|
| 11 | #include <linux/list.h>
|
| 12 | #include <linux/module.h>
|
| 13 | #include <net/net_namespace.h>
|
| 14 | #include <net/inet_dscp.h>
|
| 15 | #include <net/sock.h>
|
| 16 | #include <net/fib_rules.h>
|
| 17 | #include <net/ip_tunnels.h>
|
| 18 | #include <linux/indirect_call_wrapper.h>
|
| 19 |
|
| 20 | #if defined(CONFIG_IPV6) && defined(CONFIG_IPV6_MULTIPLE_TABLES)
|
| 21 | #ifdef CONFIG_IP_MULTIPLE_TABLES
|
| 22 | #define INDIRECT_CALL_MT(f, f2, f1, ...) \
|
| 23 | INDIRECT_CALL_INET(f, f2, f1, __VA_ARGS__)
|
| 24 | #else
|
| 25 | #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__)
|
| 26 | #endif
|
| 27 | #elif defined(CONFIG_IP_MULTIPLE_TABLES)
|
| 28 | #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
|
| 29 | #else
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| 30 | #define INDIRECT_CALL_MT(f, f2, f1, ...) f(__VA_ARGS__)
|
| 31 | #endif
|
| 32 |
|
| 33 | static const struct fib_kuid_range fib_kuid_range_unset = {
|
| 34 | KUIDT_INIT(0),
|
| 35 | KUIDT_INIT(~0),
|
| 36 | };
|
| 37 |
|
| 38 | bool fib_rule_matchall(const struct fib_rule *rule)
|
| 39 | {
|
| 40 | if (READ_ONCE(rule->iifindex) || READ_ONCE(rule->oifindex) ||
|
| 41 | rule->mark || rule->tun_id || rule->flags)
|
| 42 | return false;
|
| 43 | if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
|
| 44 | return false;
|
| 45 | if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
|
| 46 | !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
|
| 47 | return false;
|
| 48 | if (fib_rule_port_range_set(&rule->sport_range))
|
| 49 | return false;
|
| 50 | if (fib_rule_port_range_set(&rule->dport_range))
|
| 51 | return false;
|
| 52 | return true;
|
| 53 | }
|
| 54 |
|
| 55 | int fib_default_rule_add(struct fib_rules_ops *ops,
|
| 56 | u32 pref, u32 table)
|
| 57 | {
|
| 58 | struct fib_rule *r;
|
| 59 |
|
| 60 | r = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
|
| 61 | if (r == NULL)
|
| 62 | return -ENOMEM;
|
| 63 |
|
| 64 | refcount_set(&r->refcnt, 1);
|
| 65 | r->action = FR_ACT_TO_TBL;
|
| 66 | r->pref = pref;
|
| 67 | r->table = table;
|
| 68 | r->proto = RTPROT_KERNEL;
|
| 69 | r->fr_net = ops->fro_net;
|
| 70 | r->uid_range = fib_kuid_range_unset;
|
| 71 |
|
| 72 | r->suppress_prefixlen = -1;
|
| 73 | r->suppress_ifgroup = -1;
|
| 74 |
|
| 75 | |
| 76 | * at the moment this function is called
|
| 77 | list_add_tail(&r->list, &ops->rules_list);
|
| 78 | return 0;
|
| 79 | }
|
| 80 |
|
| 81 | static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
|
| 82 | {
|
| 83 | struct list_head *pos;
|
| 84 | struct fib_rule *rule;
|
| 85 |
|
| 86 | if (!list_empty(&ops->rules_list)) {
|
| 87 | pos = ops->rules_list.next;
|
| 88 | if (pos->next != &ops->rules_list) {
|
| 89 | rule = list_entry(pos->next, struct fib_rule, list);
|
| 90 | if (rule->pref)
|
| 91 | return rule->pref - 1;
|
| 92 | }
|
| 93 | }
|
| 94 |
|
| 95 | return 0;
|
| 96 | }
|
| 97 |
|
| 98 | static void notify_rule_change(int event, struct fib_rule *rule,
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| 99 | struct fib_rules_ops *ops, struct nlmsghdr *nlh,
|
| 100 | u32 pid);
|
| 101 |
|
| 102 | static struct fib_rules_ops *lookup_rules_ops(const struct net *net,
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| 103 | int family)
|
| 104 | {
|
| 105 | struct fib_rules_ops *ops;
|
| 106 |
|
| 107 | rcu_read_lock();
|
| 108 | list_for_each_entry_rcu(ops, &net->rules_ops, list) {
|
| 109 | if (ops->family == family) {
|
| 110 | if (!try_module_get(ops->owner))
|
| 111 | ops = NULL;
|
| 112 | rcu_read_unlock();
|
| 113 | return ops;
|
| 114 | }
|
| 115 | }
|
| 116 | rcu_read_unlock();
|
| 117 |
|
| 118 | return NULL;
|
| 119 | }
|
| 120 |
|
| 121 | static void rules_ops_put(struct fib_rules_ops *ops)
|
| 122 | {
|
| 123 | if (ops)
|
| 124 | module_put(ops->owner);
|
| 125 | }
|
| 126 |
|
| 127 | static void flush_route_cache(struct fib_rules_ops *ops)
|
| 128 | {
|
| 129 | if (ops->flush_cache)
|
| 130 | ops->flush_cache(ops);
|
| 131 | }
|
| 132 |
|
| 133 | static int __fib_rules_register(struct fib_rules_ops *ops)
|
| 134 | {
|
| 135 | int err = -EEXIST;
|
| 136 | struct fib_rules_ops *o;
|
| 137 | struct net *net;
|
| 138 |
|
| 139 | net = ops->fro_net;
|
| 140 |
|
| 141 | if (ops->rule_size < sizeof(struct fib_rule))
|
| 142 | return -EINVAL;
|
| 143 |
|
| 144 | if (ops->match == NULL || ops->configure == NULL ||
|
| 145 | ops->compare == NULL || ops->fill == NULL ||
|
| 146 | ops->action == NULL)
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| 147 | return -EINVAL;
|
| 148 |
|
| 149 | spin_lock(&net->rules_mod_lock);
|
| 150 | list_for_each_entry(o, &net->rules_ops, list)
|
| 151 | if (ops->family == o->family)
|
| 152 | goto errout;
|
| 153 |
|
| 154 | list_add_tail_rcu(&ops->list, &net->rules_ops);
|
| 155 | err = 0;
|
| 156 | errout:
|
| 157 | spin_unlock(&net->rules_mod_lock);
|
| 158 |
|
| 159 | return err;
|
| 160 | }
|
| 161 |
|
| 162 | struct fib_rules_ops *
|
| 163 | fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
|
| 164 | {
|
| 165 | struct fib_rules_ops *ops;
|
| 166 | int err;
|
| 167 |
|
| 168 | ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
|
| 169 | if (ops == NULL)
|
| 170 | return ERR_PTR(-ENOMEM);
|
| 171 |
|
| 172 | INIT_LIST_HEAD(&ops->rules_list);
|
| 173 | mutex_init(&ops->lock);
|
| 174 | ops->fro_net = net;
|
| 175 |
|
| 176 | err = __fib_rules_register(ops);
|
| 177 | if (err) {
|
| 178 | kfree(ops);
|
| 179 | ops = ERR_PTR(err);
|
| 180 | }
|
| 181 |
|
| 182 | return ops;
|
| 183 | }
|
| 184 |
|
| 185 | static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
|
| 186 | {
|
| 187 | struct fib_rule *rule, *tmp;
|
| 188 |
|
| 189 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
|
| 190 | list_del_rcu(&rule->list);
|
| 191 | if (ops->delete)
|
| 192 | ops->delete(rule);
|
| 193 | fib_rule_put(rule);
|
| 194 | }
|
| 195 | }
|
| 196 |
|
| 197 | void fib_rules_unregister(struct fib_rules_ops *ops)
|
| 198 | {
|
| 199 | struct net *net = ops->fro_net;
|
| 200 |
|
| 201 | spin_lock(&net->rules_mod_lock);
|
| 202 | list_del_rcu(&ops->list);
|
| 203 | spin_unlock(&net->rules_mod_lock);
|
| 204 |
|
| 205 | fib_rules_cleanup_ops(ops);
|
| 206 | mutex_destroy(&ops->lock);
|
| 207 | kfree_rcu(ops, rcu);
|
| 208 | }
|
| 209 |
|
| 210 | static int uid_range_set(struct fib_kuid_range *range)
|
| 211 | {
|
| 212 | return uid_valid(range->start) && uid_valid(range->end);
|
| 213 | }
|
| 214 |
|
| 215 | static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
|
| 216 | {
|
| 217 | struct fib_rule_uid_range *in;
|
| 218 | struct fib_kuid_range out;
|
| 219 |
|
| 220 | in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
|
| 221 |
|
| 222 | out.start = make_kuid(current_user_ns(), in->start);
|
| 223 | out.end = make_kuid(current_user_ns(), in->end);
|
| 224 |
|
| 225 | return out;
|
| 226 | }
|
| 227 |
|
| 228 | static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
|
| 229 | {
|
| 230 | struct fib_rule_uid_range out = {
|
| 231 | from_kuid_munged(current_user_ns(), range->start),
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| 232 | from_kuid_munged(current_user_ns(), range->end)
|
| 233 | };
|
| 234 |
|
| 235 | return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
|
| 236 | }
|
| 237 |
|
| 238 | static int nla_get_port_range(struct nlattr *pattr,
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| 239 | struct fib_rule_port_range *port_range)
|
| 240 | {
|
| 241 | const struct fib_rule_port_range *pr = nla_data(pattr);
|
| 242 |
|
| 243 | if (!fib_rule_port_range_valid(pr))
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| 244 | return -EINVAL;
|
| 245 |
|
| 246 | port_range->start = pr->start;
|
| 247 | port_range->end = pr->end;
|
| 248 |
|
| 249 | return 0;
|
| 250 | }
|
| 251 |
|
| 252 | static int nla_put_port_range(struct sk_buff *skb, int attrtype,
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| 253 | struct fib_rule_port_range *range)
|
| 254 | {
|
| 255 | return nla_put(skb, attrtype, sizeof(*range), range);
|
| 256 | }
|
| 257 |
|
| 258 | static bool fib_rule_iif_match(const struct fib_rule *rule, int iifindex,
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| 259 | const struct flowi *fl)
|
| 260 | {
|
| 261 | u8 iif_is_l3_master = READ_ONCE(rule->iif_is_l3_master);
|
| 262 |
|
| 263 | return iif_is_l3_master ? l3mdev_fib_rule_iif_match(fl, iifindex) :
|
| 264 | fl->flowi_iif == iifindex;
|
| 265 | }
|
| 266 |
|
| 267 | static bool fib_rule_oif_match(const struct fib_rule *rule, int oifindex,
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| 268 | const struct flowi *fl)
|
| 269 | {
|
| 270 | u8 oif_is_l3_master = READ_ONCE(rule->oif_is_l3_master);
|
| 271 |
|
| 272 | return oif_is_l3_master ? l3mdev_fib_rule_oif_match(fl, oifindex) :
|
| 273 | fl->flowi_oif == oifindex;
|
| 274 | }
|
| 275 |
|
| 276 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
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| 277 | struct flowi *fl, int flags,
|
| 278 | struct fib_lookup_arg *arg)
|
| 279 | {
|
| 280 | int iifindex, oifindex, ret = 0;
|
| 281 |
|
| 282 | iifindex = READ_ONCE(rule->iifindex);
|
| 283 | if (iifindex && !fib_rule_iif_match(rule, iifindex, fl))
|
| 284 | goto out;
|
| 285 |
|
| 286 | oifindex = READ_ONCE(rule->oifindex);
|
| 287 | if (oifindex && !fib_rule_oif_match(rule, oifindex, fl))
|
| 288 | goto out;
|
| 289 |
|
| 290 | if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
|
| 291 | goto out;
|
| 292 |
|
| 293 | if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
|
| 294 | goto out;
|
| 295 |
|
| 296 | if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
|
| 297 | goto out;
|
| 298 |
|
| 299 | if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
|
| 300 | uid_gt(fl->flowi_uid, rule->uid_range.end))
|
| 301 | goto out;
|
| 302 |
|
| 303 | ret = INDIRECT_CALL_MT(ops->match,
|
| 304 | fib6_rule_match,
|
| 305 | fib4_rule_match,
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| 306 | rule, fl, flags);
|
| 307 | out:
|
| 308 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
|
| 309 | }
|
| 310 |
|
| 311 | int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
|
| 312 | int flags, struct fib_lookup_arg *arg)
|
| 313 | {
|
| 314 | struct fib_rule *rule;
|
| 315 | int err;
|
| 316 |
|
| 317 | rcu_read_lock();
|
| 318 |
|
| 319 | list_for_each_entry_rcu(rule, &ops->rules_list, list) {
|
| 320 | jumped:
|
| 321 | if (!fib_rule_match(rule, ops, fl, flags, arg))
|
| 322 | continue;
|
| 323 |
|
| 324 | if (rule->action == FR_ACT_GOTO) {
|
| 325 | struct fib_rule *target;
|
| 326 |
|
| 327 | target = rcu_dereference(rule->ctarget);
|
| 328 | if (target == NULL) {
|
| 329 | continue;
|
| 330 | } else {
|
| 331 | rule = target;
|
| 332 | goto jumped;
|
| 333 | }
|
| 334 | } else if (rule->action == FR_ACT_NOP)
|
| 335 | continue;
|
| 336 | else
|
| 337 | err = INDIRECT_CALL_MT(ops->action,
|
| 338 | fib6_rule_action,
|
| 339 | fib4_rule_action,
|
| 340 | rule, fl, flags, arg);
|
| 341 |
|
| 342 | if (!err && ops->suppress && INDIRECT_CALL_MT(ops->suppress,
|
| 343 | fib6_rule_suppress,
|
| 344 | fib4_rule_suppress,
|
| 345 | rule, flags, arg))
|
| 346 | continue;
|
| 347 |
|
| 348 | if (err != -EAGAIN) {
|
| 349 | if ((arg->flags & FIB_LOOKUP_NOREF) ||
|
| 350 | likely(fib_rule_get_safe(rule))) {
|
| 351 | arg->rule = rule;
|
| 352 | goto out;
|
| 353 | }
|
| 354 | break;
|
| 355 | }
|
| 356 | }
|
| 357 |
|
| 358 | err = -ESRCH;
|
| 359 | out:
|
| 360 | rcu_read_unlock();
|
| 361 |
|
| 362 | return err;
|
| 363 | }
|
| 364 |
|
| 365 | static int call_fib_rule_notifier(struct notifier_block *nb,
|
| 366 | enum fib_event_type event_type,
|
| 367 | struct fib_rule *rule, int family,
|
| 368 | struct netlink_ext_ack *extack)
|
| 369 | {
|
| 370 | struct fib_rule_notifier_info info = {
|
| 371 | .info.family = family,
|
| 372 | .info.extack = extack,
|
| 373 | .rule = rule,
|
| 374 | };
|
| 375 |
|
| 376 | return call_fib_notifier(nb, event_type, &info.info);
|
| 377 | }
|
| 378 |
|
| 379 | static int call_fib_rule_notifiers(struct net *net,
|
| 380 | enum fib_event_type event_type,
|
| 381 | struct fib_rule *rule,
|
| 382 | struct fib_rules_ops *ops,
|
| 383 | struct netlink_ext_ack *extack)
|
| 384 | {
|
| 385 | struct fib_rule_notifier_info info = {
|
| 386 | .info.family = ops->family,
|
| 387 | .info.extack = extack,
|
| 388 | .rule = rule,
|
| 389 | };
|
| 390 |
|
| 391 | lockdep_assert_held(&ops->lock);
|
| 392 |
|
| 393 |
|
| 394 | WRITE_ONCE(ops->fib_rules_seq, ops->fib_rules_seq + 1);
|
| 395 | return call_fib_notifiers(net, event_type, &info.info);
|
| 396 | }
|
| 397 |
|
| 398 |
|
| 399 | int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
|
| 400 | struct netlink_ext_ack *extack)
|
| 401 | {
|
| 402 | struct fib_rules_ops *ops;
|
| 403 | struct fib_rule *rule;
|
| 404 | int err = 0;
|
| 405 |
|
| 406 | ops = lookup_rules_ops(net, family);
|
| 407 | if (!ops)
|
| 408 | return -EAFNOSUPPORT;
|
| 409 | list_for_each_entry_rcu(rule, &ops->rules_list, list) {
|
| 410 | if (!fib_rule_get_safe(rule))
|
| 411 | continue;
|
| 412 |
|
| 413 | err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD,
|
| 414 | rule, family, extack);
|
| 415 | fib_rule_put(rule);
|
| 416 | if (err)
|
| 417 | break;
|
| 418 | }
|
| 419 | rules_ops_put(ops);
|
| 420 |
|
| 421 | return err;
|
| 422 | }
|
| 423 |
|
| 424 | unsigned int fib_rules_seq_read(const struct net *net, int family)
|
| 425 | {
|
| 426 | unsigned int fib_rules_seq;
|
| 427 | struct fib_rules_ops *ops;
|
| 428 |
|
| 429 | ops = lookup_rules_ops(net, family);
|
| 430 | if (!ops)
|
| 431 | return 0;
|
| 432 |
|
| 433 | fib_rules_seq = READ_ONCE(ops->fib_rules_seq);
|
| 434 | rules_ops_put(ops);
|
| 435 |
|
| 436 | return fib_rules_seq;
|
| 437 | }
|
| 438 |
|
| 439 | static struct fib_rule *rule_find(struct fib_rules_ops *ops,
|
| 440 | struct fib_rule_hdr *frh,
|
| 441 | struct nlattr **tb,
|
| 442 | struct fib_rule *rule,
|
| 443 | bool user_priority)
|
| 444 | {
|
| 445 | struct fib_rule *r;
|
| 446 |
|
| 447 | list_for_each_entry(r, &ops->rules_list, list) {
|
| 448 | if (rule->action && r->action != rule->action)
|
| 449 | continue;
|
| 450 |
|
| 451 | if (rule->table && r->table != rule->table)
|
| 452 | continue;
|
| 453 |
|
| 454 | if (user_priority && r->pref != rule->pref)
|
| 455 | continue;
|
| 456 |
|
| 457 | if (rule->iifname[0] &&
|
| 458 | memcmp(r->iifname, rule->iifname, IFNAMSIZ))
|
| 459 | continue;
|
| 460 |
|
| 461 | if (rule->oifname[0] &&
|
| 462 | memcmp(r->oifname, rule->oifname, IFNAMSIZ))
|
| 463 | continue;
|
| 464 |
|
| 465 | if (rule->mark && r->mark != rule->mark)
|
| 466 | continue;
|
| 467 |
|
| 468 | if (rule->suppress_ifgroup != -1 &&
|
| 469 | r->suppress_ifgroup != rule->suppress_ifgroup)
|
| 470 | continue;
|
| 471 |
|
| 472 | if (rule->suppress_prefixlen != -1 &&
|
| 473 | r->suppress_prefixlen != rule->suppress_prefixlen)
|
| 474 | continue;
|
| 475 |
|
| 476 | if (rule->mark_mask && r->mark_mask != rule->mark_mask)
|
| 477 | continue;
|
| 478 |
|
| 479 | if (rule->tun_id && r->tun_id != rule->tun_id)
|
| 480 | continue;
|
| 481 |
|
| 482 | if (rule->l3mdev && r->l3mdev != rule->l3mdev)
|
| 483 | continue;
|
| 484 |
|
| 485 | if (uid_range_set(&rule->uid_range) &&
|
| 486 | (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
|
| 487 | !uid_eq(r->uid_range.end, rule->uid_range.end)))
|
| 488 | continue;
|
| 489 |
|
| 490 | if (rule->ip_proto && r->ip_proto != rule->ip_proto)
|
| 491 | continue;
|
| 492 |
|
| 493 | if (rule->proto && r->proto != rule->proto)
|
| 494 | continue;
|
| 495 |
|
| 496 | if (fib_rule_port_range_set(&rule->sport_range) &&
|
| 497 | !fib_rule_port_range_compare(&r->sport_range,
|
| 498 | &rule->sport_range))
|
| 499 | continue;
|
| 500 |
|
| 501 | if (rule->sport_mask && r->sport_mask != rule->sport_mask)
|
| 502 | continue;
|
| 503 |
|
| 504 | if (fib_rule_port_range_set(&rule->dport_range) &&
|
| 505 | !fib_rule_port_range_compare(&r->dport_range,
|
| 506 | &rule->dport_range))
|
| 507 | continue;
|
| 508 |
|
| 509 | if (rule->dport_mask && r->dport_mask != rule->dport_mask)
|
| 510 | continue;
|
| 511 |
|
| 512 | if (!ops->compare(r, frh, tb))
|
| 513 | continue;
|
| 514 | return r;
|
| 515 | }
|
| 516 |
|
| 517 | return NULL;
|
| 518 | }
|
| 519 |
|
| 520 | #ifdef CONFIG_NET_L3_MASTER_DEV
|
| 521 | static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
|
| 522 | struct netlink_ext_ack *extack)
|
| 523 | {
|
| 524 | nlrule->l3mdev = nla_get_u8(nla);
|
| 525 | if (nlrule->l3mdev != 1) {
|
| 526 | NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
|
| 527 | return -1;
|
| 528 | }
|
| 529 |
|
| 530 | return 0;
|
| 531 | }
|
| 532 | #else
|
| 533 | static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
|
| 534 | struct netlink_ext_ack *extack)
|
| 535 | {
|
| 536 | NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
|
| 537 | return -1;
|
| 538 | }
|
| 539 | #endif
|
| 540 |
|
| 541 | static int fib_nl2rule_port_mask(const struct nlattr *mask_attr,
|
| 542 | const struct fib_rule_port_range *range,
|
| 543 | u16 *port_mask,
|
| 544 | struct netlink_ext_ack *extack)
|
| 545 | {
|
| 546 | if (!fib_rule_port_range_valid(range)) {
|
| 547 | NL_SET_ERR_MSG_ATTR(extack, mask_attr,
|
| 548 | "Cannot specify port mask without port value");
|
| 549 | return -EINVAL;
|
| 550 | }
|
| 551 |
|
| 552 | if (fib_rule_port_is_range(range)) {
|
| 553 | NL_SET_ERR_MSG_ATTR(extack, mask_attr,
|
| 554 | "Cannot specify port mask for port range");
|
| 555 | return -EINVAL;
|
| 556 | }
|
| 557 |
|
| 558 | if (range->start & ~nla_get_u16(mask_attr)) {
|
| 559 | NL_SET_ERR_MSG_ATTR(extack, mask_attr, "Invalid port mask");
|
| 560 | return -EINVAL;
|
| 561 | }
|
| 562 |
|
| 563 | *port_mask = nla_get_u16(mask_attr);
|
| 564 |
|
| 565 | return 0;
|
| 566 | }
|
| 567 |
|
| 568 | static int fib_nl2rule(struct net *net, struct nlmsghdr *nlh,
|
| 569 | struct netlink_ext_ack *extack,
|
| 570 | struct fib_rules_ops *ops,
|
| 571 | struct nlattr *tb[],
|
| 572 | struct fib_rule **rule,
|
| 573 | bool *user_priority)
|
| 574 | {
|
| 575 | struct fib_rule_hdr *frh = nlmsg_data(nlh);
|
| 576 | struct fib_rule *nlrule = NULL;
|
| 577 | int err = -EINVAL;
|
| 578 |
|
| 579 | if (frh->src_len)
|
| 580 | if (!tb[FRA_SRC] ||
|
| 581 | frh->src_len > (ops->addr_size * 8) ||
|
| 582 | nla_len(tb[FRA_SRC]) != ops->addr_size) {
|
| 583 | NL_SET_ERR_MSG(extack, "Invalid source address");
|
| 584 | goto errout;
|
| 585 | }
|
| 586 |
|
| 587 | if (frh->dst_len)
|
| 588 | if (!tb[FRA_DST] ||
|
| 589 | frh->dst_len > (ops->addr_size * 8) ||
|
| 590 | nla_len(tb[FRA_DST]) != ops->addr_size) {
|
| 591 | NL_SET_ERR_MSG(extack, "Invalid dst address");
|
| 592 | goto errout;
|
| 593 | }
|
| 594 |
|
| 595 | nlrule = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
|
| 596 | if (!nlrule) {
|
| 597 | err = -ENOMEM;
|
| 598 | goto errout;
|
| 599 | }
|
| 600 | refcount_set(&nlrule->refcnt, 1);
|
| 601 | nlrule->fr_net = net;
|
| 602 |
|
| 603 | if (tb[FRA_PRIORITY]) {
|
| 604 | nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
|
| 605 | *user_priority = true;
|
| 606 | }
|
| 607 |
|
| 608 | nlrule->proto = nla_get_u8_default(tb[FRA_PROTOCOL], RTPROT_UNSPEC);
|
| 609 |
|
| 610 | if (tb[FRA_IIFNAME]) {
|
| 611 | nlrule->iifindex = -1;
|
| 612 | nla_strscpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
|
| 613 | }
|
| 614 |
|
| 615 | if (tb[FRA_OIFNAME]) {
|
| 616 | nlrule->oifindex = -1;
|
| 617 | nla_strscpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
|
| 618 | }
|
| 619 |
|
| 620 | if (tb[FRA_FWMARK]) {
|
| 621 | nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
|
| 622 | if (nlrule->mark)
|
| 623 | |
| 624 | * are compared unless a mask is explicitly specified.
|
| 625 |
|
| 626 | nlrule->mark_mask = 0xFFFFFFFF;
|
| 627 | }
|
| 628 |
|
| 629 | if (tb[FRA_FWMASK])
|
| 630 | nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
|
| 631 |
|
| 632 | if (tb[FRA_TUN_ID])
|
| 633 | nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
|
| 634 |
|
| 635 | if (tb[FRA_L3MDEV] &&
|
| 636 | fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
|
| 637 | goto errout_free;
|
| 638 |
|
| 639 | nlrule->action = frh->action;
|
| 640 | nlrule->flags = frh->flags;
|
| 641 | nlrule->table = frh_get_table(frh, tb);
|
| 642 | if (tb[FRA_SUPPRESS_PREFIXLEN])
|
| 643 | nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
|
| 644 | else
|
| 645 | nlrule->suppress_prefixlen = -1;
|
| 646 |
|
| 647 | if (tb[FRA_SUPPRESS_IFGROUP])
|
| 648 | nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
|
| 649 | else
|
| 650 | nlrule->suppress_ifgroup = -1;
|
| 651 |
|
| 652 | if (tb[FRA_GOTO]) {
|
| 653 | if (nlrule->action != FR_ACT_GOTO) {
|
| 654 | NL_SET_ERR_MSG(extack, "Unexpected goto");
|
| 655 | goto errout_free;
|
| 656 | }
|
| 657 |
|
| 658 | nlrule->target = nla_get_u32(tb[FRA_GOTO]);
|
| 659 | } else if (nlrule->action == FR_ACT_GOTO) {
|
| 660 | NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
|
| 661 | goto errout_free;
|
| 662 | }
|
| 663 |
|
| 664 | if (nlrule->l3mdev && nlrule->table) {
|
| 665 | NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
|
| 666 | goto errout_free;
|
| 667 | }
|
| 668 |
|
| 669 | if (tb[FRA_UID_RANGE]) {
|
| 670 | if (current_user_ns() != net->user_ns) {
|
| 671 | err = -EPERM;
|
| 672 | NL_SET_ERR_MSG(extack, "No permission to set uid");
|
| 673 | goto errout_free;
|
| 674 | }
|
| 675 |
|
| 676 | nlrule->uid_range = nla_get_kuid_range(tb);
|
| 677 |
|
| 678 | if (!uid_range_set(&nlrule->uid_range) ||
|
| 679 | !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
|
| 680 | NL_SET_ERR_MSG(extack, "Invalid uid range");
|
| 681 | goto errout_free;
|
| 682 | }
|
| 683 | } else {
|
| 684 | nlrule->uid_range = fib_kuid_range_unset;
|
| 685 | }
|
| 686 |
|
| 687 | if (tb[FRA_IP_PROTO])
|
| 688 | nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
|
| 689 |
|
| 690 | if (tb[FRA_SPORT_RANGE]) {
|
| 691 | err = nla_get_port_range(tb[FRA_SPORT_RANGE],
|
| 692 | &nlrule->sport_range);
|
| 693 | if (err) {
|
| 694 | NL_SET_ERR_MSG(extack, "Invalid sport range");
|
| 695 | goto errout_free;
|
| 696 | }
|
| 697 | if (!fib_rule_port_is_range(&nlrule->sport_range))
|
| 698 | nlrule->sport_mask = U16_MAX;
|
| 699 | }
|
| 700 |
|
| 701 | if (tb[FRA_SPORT_MASK]) {
|
| 702 | err = fib_nl2rule_port_mask(tb[FRA_SPORT_MASK],
|
| 703 | &nlrule->sport_range,
|
| 704 | &nlrule->sport_mask, extack);
|
| 705 | if (err)
|
| 706 | goto errout_free;
|
| 707 | }
|
| 708 |
|
| 709 | if (tb[FRA_DPORT_RANGE]) {
|
| 710 | err = nla_get_port_range(tb[FRA_DPORT_RANGE],
|
| 711 | &nlrule->dport_range);
|
| 712 | if (err) {
|
| 713 | NL_SET_ERR_MSG(extack, "Invalid dport range");
|
| 714 | goto errout_free;
|
| 715 | }
|
| 716 | if (!fib_rule_port_is_range(&nlrule->dport_range))
|
| 717 | nlrule->dport_mask = U16_MAX;
|
| 718 | }
|
| 719 |
|
| 720 | if (tb[FRA_DPORT_MASK]) {
|
| 721 | err = fib_nl2rule_port_mask(tb[FRA_DPORT_MASK],
|
| 722 | &nlrule->dport_range,
|
| 723 | &nlrule->dport_mask, extack);
|
| 724 | if (err)
|
| 725 | goto errout_free;
|
| 726 | }
|
| 727 |
|
| 728 | *rule = nlrule;
|
| 729 |
|
| 730 | return 0;
|
| 731 |
|
| 732 | errout_free:
|
| 733 | kfree(nlrule);
|
| 734 | errout:
|
| 735 | return err;
|
| 736 | }
|
| 737 |
|
| 738 | static int fib_nl2rule_locked(struct fib_rule *nlrule,
|
| 739 | struct fib_rules_ops *ops,
|
| 740 | struct nlattr *tb[],
|
| 741 | struct netlink_ext_ack *extack)
|
| 742 | {
|
| 743 | if (!tb[FRA_PRIORITY])
|
| 744 | nlrule->pref = fib_default_rule_pref(ops);
|
| 745 |
|
| 746 |
|
| 747 | if (tb[FRA_GOTO] && nlrule->target <= nlrule->pref) {
|
| 748 | NL_SET_ERR_MSG(extack, "Backward goto not supported");
|
| 749 | return -EINVAL;
|
| 750 | }
|
| 751 |
|
| 752 | rcu_read_lock();
|
| 753 |
|
| 754 | if (tb[FRA_IIFNAME]) {
|
| 755 | struct net_device *dev;
|
| 756 |
|
| 757 | dev = dev_get_by_name_rcu(nlrule->fr_net, nlrule->iifname);
|
| 758 | if (dev) {
|
| 759 | nlrule->iifindex = READ_ONCE(dev->ifindex);
|
| 760 | nlrule->iif_is_l3_master = netif_is_l3_master(dev);
|
| 761 | }
|
| 762 | }
|
| 763 |
|
| 764 | if (tb[FRA_OIFNAME]) {
|
| 765 | struct net_device *dev;
|
| 766 |
|
| 767 | dev = dev_get_by_name_rcu(nlrule->fr_net, nlrule->oifname);
|
| 768 | if (dev) {
|
| 769 | nlrule->oifindex = READ_ONCE(dev->ifindex);
|
| 770 | nlrule->oif_is_l3_master = netif_is_l3_master(dev);
|
| 771 | }
|
| 772 | }
|
| 773 |
|
| 774 | rcu_read_unlock();
|
| 775 |
|
| 776 | return 0;
|
| 777 | }
|
| 778 |
|
| 779 | static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
|
| 780 | struct nlattr **tb, struct fib_rule *rule)
|
| 781 | {
|
| 782 | struct fib_rule *r;
|
| 783 |
|
| 784 | list_for_each_entry(r, &ops->rules_list, list) {
|
| 785 | if (r->action != rule->action)
|
| 786 | continue;
|
| 787 |
|
| 788 | if (r->table != rule->table)
|
| 789 | continue;
|
| 790 |
|
| 791 | if (r->pref != rule->pref)
|
| 792 | continue;
|
| 793 |
|
| 794 | if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
|
| 795 | continue;
|
| 796 |
|
| 797 | if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
|
| 798 | continue;
|
| 799 |
|
| 800 | if (r->mark != rule->mark)
|
| 801 | continue;
|
| 802 |
|
| 803 | if (r->suppress_ifgroup != rule->suppress_ifgroup)
|
| 804 | continue;
|
| 805 |
|
| 806 | if (r->suppress_prefixlen != rule->suppress_prefixlen)
|
| 807 | continue;
|
| 808 |
|
| 809 | if (r->mark_mask != rule->mark_mask)
|
| 810 | continue;
|
| 811 |
|
| 812 | if (r->tun_id != rule->tun_id)
|
| 813 | continue;
|
| 814 |
|
| 815 | if (r->l3mdev != rule->l3mdev)
|
| 816 | continue;
|
| 817 |
|
| 818 | if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
|
| 819 | !uid_eq(r->uid_range.end, rule->uid_range.end))
|
| 820 | continue;
|
| 821 |
|
| 822 | if (r->ip_proto != rule->ip_proto)
|
| 823 | continue;
|
| 824 |
|
| 825 | if (r->proto != rule->proto)
|
| 826 | continue;
|
| 827 |
|
| 828 | if (!fib_rule_port_range_compare(&r->sport_range,
|
| 829 | &rule->sport_range))
|
| 830 | continue;
|
| 831 |
|
| 832 | if (r->sport_mask != rule->sport_mask)
|
| 833 | continue;
|
| 834 |
|
| 835 | if (!fib_rule_port_range_compare(&r->dport_range,
|
| 836 | &rule->dport_range))
|
| 837 | continue;
|
| 838 |
|
| 839 | if (r->dport_mask != rule->dport_mask)
|
| 840 | continue;
|
| 841 |
|
| 842 | if (!ops->compare(r, frh, tb))
|
| 843 | continue;
|
| 844 | return 1;
|
| 845 | }
|
| 846 | return 0;
|
| 847 | }
|
| 848 |
|
| 849 | static const struct nla_policy fib_rule_policy[FRA_MAX + 1] = {
|
| 850 | [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 },
|
| 851 | [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
|
| 852 | [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
|
| 853 | [FRA_PRIORITY] = { .type = NLA_U32 },
|
| 854 | [FRA_FWMARK] = { .type = NLA_U32 },
|
| 855 | [FRA_FLOW] = { .type = NLA_U32 },
|
| 856 | [FRA_TUN_ID] = { .type = NLA_U64 },
|
| 857 | [FRA_FWMASK] = { .type = NLA_U32 },
|
| 858 | [FRA_TABLE] = { .type = NLA_U32 },
|
| 859 | [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 },
|
| 860 | [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 },
|
| 861 | [FRA_GOTO] = { .type = NLA_U32 },
|
| 862 | [FRA_L3MDEV] = { .type = NLA_U8 },
|
| 863 | [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) },
|
| 864 | [FRA_PROTOCOL] = { .type = NLA_U8 },
|
| 865 | [FRA_IP_PROTO] = { .type = NLA_U8 },
|
| 866 | [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
|
| 867 | [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
|
| 868 | [FRA_DSCP] = NLA_POLICY_MAX(NLA_U8, INET_DSCP_MASK >> 2),
|
| 869 | [FRA_FLOWLABEL] = { .type = NLA_BE32 },
|
| 870 | [FRA_FLOWLABEL_MASK] = { .type = NLA_BE32 },
|
| 871 | [FRA_SPORT_MASK] = { .type = NLA_U16 },
|
| 872 | [FRA_DPORT_MASK] = { .type = NLA_U16 },
|
| 873 | [FRA_DSCP_MASK] = NLA_POLICY_MASK(NLA_U8, INET_DSCP_MASK >> 2),
|
| 874 | };
|
| 875 |
|
| 876 | int fib_newrule(struct net *net, struct sk_buff *skb, struct nlmsghdr *nlh,
|
| 877 | struct netlink_ext_ack *extack, bool rtnl_held)
|
| 878 | {
|
| 879 | struct fib_rule *rule = NULL, *r, *last = NULL;
|
| 880 | int err = -EINVAL, unresolved = 0;
|
| 881 | struct fib_rules_ops *ops = NULL;
|
| 882 | struct nlattr *tb[FRA_MAX + 1];
|
| 883 | bool user_priority = false;
|
| 884 | struct fib_rule_hdr *frh;
|
| 885 | bool unlock_rtnl = false;
|
| 886 |
|
| 887 | frh = nlmsg_payload(nlh, sizeof(*frh));
|
| 888 | if (!frh) {
|
| 889 | NL_SET_ERR_MSG(extack, "Invalid msg length");
|
| 890 | goto errout;
|
| 891 | }
|
| 892 |
|
| 893 | ops = lookup_rules_ops(net, frh->family);
|
| 894 | if (!ops) {
|
| 895 | err = -EAFNOSUPPORT;
|
| 896 | NL_SET_ERR_MSG(extack, "Rule family not supported");
|
| 897 | goto errout;
|
| 898 | }
|
| 899 |
|
| 900 | err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
|
| 901 | fib_rule_policy, extack);
|
| 902 | if (err < 0) {
|
| 903 | NL_SET_ERR_MSG(extack, "Error parsing msg");
|
| 904 | goto errout;
|
| 905 | }
|
| 906 |
|
| 907 | err = fib_nl2rule(net, nlh, extack, ops, tb, &rule, &user_priority);
|
| 908 | if (err)
|
| 909 | goto errout;
|
| 910 |
|
| 911 | if (!rtnl_held && ops->need_rtnl && ops->need_rtnl(net)) {
|
| 912 | unlock_rtnl = true;
|
| 913 | rtnl_net_lock(net);
|
| 914 | }
|
| 915 | mutex_lock(&ops->lock);
|
| 916 |
|
| 917 | err = fib_nl2rule_locked(rule, ops, tb, extack);
|
| 918 | if (err)
|
| 919 | goto errout_free;
|
| 920 |
|
| 921 | if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
|
| 922 | rule_exists(ops, frh, tb, rule)) {
|
| 923 | err = -EEXIST;
|
| 924 | goto errout_free;
|
| 925 | }
|
| 926 |
|
| 927 | err = ops->configure(rule, skb, frh, tb, extack);
|
| 928 | if (err < 0)
|
| 929 | goto errout_free;
|
| 930 |
|
| 931 | err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
|
| 932 | extack);
|
| 933 | if (err < 0)
|
| 934 | goto errout_free;
|
| 935 |
|
| 936 | list_for_each_entry(r, &ops->rules_list, list) {
|
| 937 | if (r->pref == rule->target) {
|
| 938 | RCU_INIT_POINTER(rule->ctarget, r);
|
| 939 | break;
|
| 940 | }
|
| 941 | }
|
| 942 |
|
| 943 | if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
|
| 944 | unresolved = 1;
|
| 945 |
|
| 946 | list_for_each_entry(r, &ops->rules_list, list) {
|
| 947 | if (r->pref > rule->pref)
|
| 948 | break;
|
| 949 | last = r;
|
| 950 | }
|
| 951 |
|
| 952 | if (last)
|
| 953 | list_add_rcu(&rule->list, &last->list);
|
| 954 | else
|
| 955 | list_add_rcu(&rule->list, &ops->rules_list);
|
| 956 |
|
| 957 | if (ops->unresolved_rules) {
|
| 958 | |
| 959 | * There are unresolved goto rules in the list, check if
|
| 960 | * any of them are pointing to this new rule.
|
| 961 |
|
| 962 | list_for_each_entry(r, &ops->rules_list, list) {
|
| 963 | if (r->action == FR_ACT_GOTO &&
|
| 964 | r->target == rule->pref &&
|
| 965 | !rcu_access_pointer(r->ctarget)) {
|
| 966 | rcu_assign_pointer(r->ctarget, rule);
|
| 967 | if (--ops->unresolved_rules == 0)
|
| 968 | break;
|
| 969 | }
|
| 970 | }
|
| 971 | }
|
| 972 |
|
| 973 | if (rule->action == FR_ACT_GOTO)
|
| 974 | ops->nr_goto_rules++;
|
| 975 |
|
| 976 | if (unresolved)
|
| 977 | ops->unresolved_rules++;
|
| 978 |
|
| 979 | if (rule->tun_id)
|
| 980 | ip_tunnel_need_metadata();
|
| 981 |
|
| 982 | fib_rule_get(rule);
|
| 983 |
|
| 984 | mutex_unlock(&ops->lock);
|
| 985 | if (unlock_rtnl)
|
| 986 | rtnl_net_unlock(net);
|
| 987 |
|
| 988 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
|
| 989 | fib_rule_put(rule);
|
| 990 | flush_route_cache(ops);
|
| 991 | rules_ops_put(ops);
|
| 992 | return 0;
|
| 993 |
|
| 994 | errout_free:
|
| 995 | mutex_unlock(&ops->lock);
|
| 996 | if (unlock_rtnl)
|
| 997 | rtnl_net_unlock(net);
|
| 998 | kfree(rule);
|
| 999 | errout:
|
| 1000 | rules_ops_put(ops);
|
| 1001 | return err;
|
| 1002 | }
|
| 1003 | EXPORT_SYMBOL_GPL(fib_newrule);
|
| 1004 |
|
| 1005 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
|
| 1006 | struct netlink_ext_ack *extack)
|
| 1007 | {
|
| 1008 | return fib_newrule(sock_net(skb->sk), skb, nlh, extack, false);
|
| 1009 | }
|
| 1010 |
|
| 1011 | int fib_delrule(struct net *net, struct sk_buff *skb, struct nlmsghdr *nlh,
|
| 1012 | struct netlink_ext_ack *extack, bool rtnl_held)
|
| 1013 | {
|
| 1014 | struct fib_rule *rule = NULL, *nlrule = NULL;
|
| 1015 | struct fib_rules_ops *ops = NULL;
|
| 1016 | struct nlattr *tb[FRA_MAX+1];
|
| 1017 | bool user_priority = false;
|
| 1018 | struct fib_rule_hdr *frh;
|
| 1019 | int err = -EINVAL;
|
| 1020 |
|
| 1021 | frh = nlmsg_payload(nlh, sizeof(*frh));
|
| 1022 | if (!frh) {
|
| 1023 | NL_SET_ERR_MSG(extack, "Invalid msg length");
|
| 1024 | goto errout;
|
| 1025 | }
|
| 1026 |
|
| 1027 | ops = lookup_rules_ops(net, frh->family);
|
| 1028 | if (ops == NULL) {
|
| 1029 | err = -EAFNOSUPPORT;
|
| 1030 | NL_SET_ERR_MSG(extack, "Rule family not supported");
|
| 1031 | goto errout;
|
| 1032 | }
|
| 1033 |
|
| 1034 | err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
|
| 1035 | fib_rule_policy, extack);
|
| 1036 | if (err < 0) {
|
| 1037 | NL_SET_ERR_MSG(extack, "Error parsing msg");
|
| 1038 | goto errout;
|
| 1039 | }
|
| 1040 |
|
| 1041 | err = fib_nl2rule(net, nlh, extack, ops, tb, &nlrule, &user_priority);
|
| 1042 | if (err)
|
| 1043 | goto errout;
|
| 1044 |
|
| 1045 | mutex_lock(&ops->lock);
|
| 1046 |
|
| 1047 | err = fib_nl2rule_locked(nlrule, ops, tb, extack);
|
| 1048 | if (err)
|
| 1049 | goto errout_free;
|
| 1050 |
|
| 1051 | rule = rule_find(ops, frh, tb, nlrule, user_priority);
|
| 1052 | if (!rule) {
|
| 1053 | err = -ENOENT;
|
| 1054 | goto errout_free;
|
| 1055 | }
|
| 1056 |
|
| 1057 | if (rule->flags & FIB_RULE_PERMANENT) {
|
| 1058 | err = -EPERM;
|
| 1059 | goto errout_free;
|
| 1060 | }
|
| 1061 |
|
| 1062 | if (ops->delete)
|
| 1063 | ops->delete(rule);
|
| 1064 |
|
| 1065 | if (rule->tun_id)
|
| 1066 | ip_tunnel_unneed_metadata();
|
| 1067 |
|
| 1068 | list_del_rcu(&rule->list);
|
| 1069 |
|
| 1070 | if (rule->action == FR_ACT_GOTO) {
|
| 1071 | ops->nr_goto_rules--;
|
| 1072 | if (!rcu_access_pointer(rule->ctarget))
|
| 1073 | ops->unresolved_rules--;
|
| 1074 | }
|
| 1075 |
|
| 1076 | |
| 1077 | * Check if this rule is a target to any of them. If so,
|
| 1078 | * adjust to the next one with the same preference or
|
| 1079 | * disable them. As this operation is eventually very
|
| 1080 | * expensive, it is only performed if goto rules, except
|
| 1081 | * current if it is goto rule, have actually been added.
|
| 1082 |
|
| 1083 | if (ops->nr_goto_rules > 0) {
|
| 1084 | struct fib_rule *n, *r;
|
| 1085 |
|
| 1086 | n = list_next_entry(rule, list);
|
| 1087 | if (&n->list == &ops->rules_list || n->pref != rule->pref)
|
| 1088 | n = NULL;
|
| 1089 | list_for_each_entry(r, &ops->rules_list, list) {
|
| 1090 | if (rcu_access_pointer(r->ctarget) != rule)
|
| 1091 | continue;
|
| 1092 | rcu_assign_pointer(r->ctarget, n);
|
| 1093 | if (!n)
|
| 1094 | ops->unresolved_rules++;
|
| 1095 | }
|
| 1096 | }
|
| 1097 |
|
| 1098 | call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops, NULL);
|
| 1099 |
|
| 1100 | mutex_unlock(&ops->lock);
|
| 1101 |
|
| 1102 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
|
| 1103 | fib_rule_put(rule);
|
| 1104 | flush_route_cache(ops);
|
| 1105 | rules_ops_put(ops);
|
| 1106 | kfree(nlrule);
|
| 1107 | return 0;
|
| 1108 |
|
| 1109 | errout_free:
|
| 1110 | mutex_unlock(&ops->lock);
|
| 1111 | kfree(nlrule);
|
| 1112 | errout:
|
| 1113 | rules_ops_put(ops);
|
| 1114 | return err;
|
| 1115 | }
|
| 1116 | EXPORT_SYMBOL_GPL(fib_delrule);
|
| 1117 |
|
| 1118 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
|
| 1119 | struct netlink_ext_ack *extack)
|
| 1120 | {
|
| 1121 | return fib_delrule(sock_net(skb->sk), skb, nlh, extack, false);
|
| 1122 | }
|
| 1123 |
|
| 1124 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
|
| 1125 | struct fib_rule *rule)
|
| 1126 | {
|
| 1127 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
|
| 1128 | + nla_total_size(IFNAMSIZ)
|
| 1129 | + nla_total_size(IFNAMSIZ)
|
| 1130 | + nla_total_size(4)
|
| 1131 | + nla_total_size(4)
|
| 1132 | + nla_total_size(4)
|
| 1133 | + nla_total_size(4)
|
| 1134 | + nla_total_size(4)
|
| 1135 | + nla_total_size(4)
|
| 1136 | + nla_total_size_64bit(8)
|
| 1137 | + nla_total_size(sizeof(struct fib_kuid_range))
|
| 1138 | + nla_total_size(1)
|
| 1139 | + nla_total_size(1)
|
| 1140 | + nla_total_size(sizeof(struct fib_rule_port_range))
|
| 1141 | + nla_total_size(sizeof(struct fib_rule_port_range))
|
| 1142 | + nla_total_size(2)
|
| 1143 | + nla_total_size(2);
|
| 1144 |
|
| 1145 | if (ops->nlmsg_payload)
|
| 1146 | payload += ops->nlmsg_payload(rule);
|
| 1147 |
|
| 1148 | return payload;
|
| 1149 | }
|
| 1150 |
|
| 1151 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
|
| 1152 | u32 pid, u32 seq, int type, int flags,
|
| 1153 | struct fib_rules_ops *ops)
|
| 1154 | {
|
| 1155 | struct nlmsghdr *nlh;
|
| 1156 | struct fib_rule_hdr *frh;
|
| 1157 |
|
| 1158 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
|
| 1159 | if (nlh == NULL)
|
| 1160 | return -EMSGSIZE;
|
| 1161 |
|
| 1162 | frh = nlmsg_data(nlh);
|
| 1163 | frh->family = ops->family;
|
| 1164 | frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT;
|
| 1165 | if (nla_put_u32(skb, FRA_TABLE, rule->table))
|
| 1166 | goto nla_put_failure;
|
| 1167 | if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
|
| 1168 | goto nla_put_failure;
|
| 1169 | frh->res1 = 0;
|
| 1170 | frh->res2 = 0;
|
| 1171 | frh->action = rule->action;
|
| 1172 | frh->flags = rule->flags;
|
| 1173 |
|
| 1174 | if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
|
| 1175 | goto nla_put_failure;
|
| 1176 |
|
| 1177 | if (rule->action == FR_ACT_GOTO &&
|
| 1178 | rcu_access_pointer(rule->ctarget) == NULL)
|
| 1179 | frh->flags |= FIB_RULE_UNRESOLVED;
|
| 1180 |
|
| 1181 | if (rule->iifname[0]) {
|
| 1182 | if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
|
| 1183 | goto nla_put_failure;
|
| 1184 | if (READ_ONCE(rule->iifindex) == -1)
|
| 1185 | frh->flags |= FIB_RULE_IIF_DETACHED;
|
| 1186 | }
|
| 1187 |
|
| 1188 | if (rule->oifname[0]) {
|
| 1189 | if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
|
| 1190 | goto nla_put_failure;
|
| 1191 | if (READ_ONCE(rule->oifindex) == -1)
|
| 1192 | frh->flags |= FIB_RULE_OIF_DETACHED;
|
| 1193 | }
|
| 1194 |
|
| 1195 | if ((rule->pref &&
|
| 1196 | nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
|
| 1197 | (rule->mark &&
|
| 1198 | nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
|
| 1199 | ((rule->mark_mask || rule->mark) &&
|
| 1200 | nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
|
| 1201 | (rule->target &&
|
| 1202 | nla_put_u32(skb, FRA_GOTO, rule->target)) ||
|
| 1203 | (rule->tun_id &&
|
| 1204 | nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
|
| 1205 | (rule->l3mdev &&
|
| 1206 | nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
|
| 1207 | (uid_range_set(&rule->uid_range) &&
|
| 1208 | nla_put_uid_range(skb, &rule->uid_range)) ||
|
| 1209 | (fib_rule_port_range_set(&rule->sport_range) &&
|
| 1210 | nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
|
| 1211 | (rule->sport_mask && nla_put_u16(skb, FRA_SPORT_MASK,
|
| 1212 | rule->sport_mask)) ||
|
| 1213 | (fib_rule_port_range_set(&rule->dport_range) &&
|
| 1214 | nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
|
| 1215 | (rule->dport_mask && nla_put_u16(skb, FRA_DPORT_MASK,
|
| 1216 | rule->dport_mask)) ||
|
| 1217 | (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
|
| 1218 | goto nla_put_failure;
|
| 1219 |
|
| 1220 | if (rule->suppress_ifgroup != -1) {
|
| 1221 | if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
|
| 1222 | goto nla_put_failure;
|
| 1223 | }
|
| 1224 |
|
| 1225 | if (ops->fill(rule, skb, frh) < 0)
|
| 1226 | goto nla_put_failure;
|
| 1227 |
|
| 1228 | nlmsg_end(skb, nlh);
|
| 1229 | return 0;
|
| 1230 |
|
| 1231 | nla_put_failure:
|
| 1232 | nlmsg_cancel(skb, nlh);
|
| 1233 | return -EMSGSIZE;
|
| 1234 | }
|
| 1235 |
|
| 1236 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
|
| 1237 | struct fib_rules_ops *ops)
|
| 1238 | {
|
| 1239 | int idx = 0;
|
| 1240 | struct fib_rule *rule;
|
| 1241 | int err = 0;
|
| 1242 |
|
| 1243 | rcu_read_lock();
|
| 1244 | list_for_each_entry_rcu(rule, &ops->rules_list, list) {
|
| 1245 | if (idx < cb->args[1])
|
| 1246 | goto skip;
|
| 1247 |
|
| 1248 | err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
|
| 1249 | cb->nlh->nlmsg_seq, RTM_NEWRULE,
|
| 1250 | NLM_F_MULTI, ops);
|
| 1251 | if (err)
|
| 1252 | break;
|
| 1253 | skip:
|
| 1254 | idx++;
|
| 1255 | }
|
| 1256 | rcu_read_unlock();
|
| 1257 | cb->args[1] = idx;
|
| 1258 | rules_ops_put(ops);
|
| 1259 |
|
| 1260 | return err;
|
| 1261 | }
|
| 1262 |
|
| 1263 | static int fib_valid_dumprule_req(const struct nlmsghdr *nlh,
|
| 1264 | struct netlink_ext_ack *extack)
|
| 1265 | {
|
| 1266 | struct fib_rule_hdr *frh;
|
| 1267 |
|
| 1268 | frh = nlmsg_payload(nlh, sizeof(*frh));
|
| 1269 | if (!frh) {
|
| 1270 | NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request");
|
| 1271 | return -EINVAL;
|
| 1272 | }
|
| 1273 |
|
| 1274 | if (frh->dst_len || frh->src_len || frh->tos || frh->table ||
|
| 1275 | frh->res1 || frh->res2 || frh->action || frh->flags) {
|
| 1276 | NL_SET_ERR_MSG(extack,
|
| 1277 | "Invalid values in header for fib rule dump request");
|
| 1278 | return -EINVAL;
|
| 1279 | }
|
| 1280 |
|
| 1281 | if (nlmsg_attrlen(nlh, sizeof(*frh))) {
|
| 1282 | NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request");
|
| 1283 | return -EINVAL;
|
| 1284 | }
|
| 1285 |
|
| 1286 | return 0;
|
| 1287 | }
|
| 1288 |
|
| 1289 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
|
| 1290 | {
|
| 1291 | const struct nlmsghdr *nlh = cb->nlh;
|
| 1292 | struct net *net = sock_net(skb->sk);
|
| 1293 | struct fib_rules_ops *ops;
|
| 1294 | int err, idx = 0, family;
|
| 1295 |
|
| 1296 | if (cb->strict_check) {
|
| 1297 | err = fib_valid_dumprule_req(nlh, cb->extack);
|
| 1298 |
|
| 1299 | if (err < 0)
|
| 1300 | return err;
|
| 1301 | }
|
| 1302 |
|
| 1303 | family = rtnl_msg_family(nlh);
|
| 1304 | if (family != AF_UNSPEC) {
|
| 1305 |
|
| 1306 | ops = lookup_rules_ops(net, family);
|
| 1307 | if (ops == NULL)
|
| 1308 | return -EAFNOSUPPORT;
|
| 1309 |
|
| 1310 | return dump_rules(skb, cb, ops);
|
| 1311 | }
|
| 1312 |
|
| 1313 | err = 0;
|
| 1314 | rcu_read_lock();
|
| 1315 | list_for_each_entry_rcu(ops, &net->rules_ops, list) {
|
| 1316 | if (idx < cb->args[0] || !try_module_get(ops->owner))
|
| 1317 | goto skip;
|
| 1318 |
|
| 1319 | err = dump_rules(skb, cb, ops);
|
| 1320 | if (err < 0)
|
| 1321 | break;
|
| 1322 |
|
| 1323 | cb->args[1] = 0;
|
| 1324 | skip:
|
| 1325 | idx++;
|
| 1326 | }
|
| 1327 | rcu_read_unlock();
|
| 1328 | cb->args[0] = idx;
|
| 1329 |
|
| 1330 | return err;
|
| 1331 | }
|
| 1332 |
|
| 1333 | static void notify_rule_change(int event, struct fib_rule *rule,
|
| 1334 | struct fib_rules_ops *ops, struct nlmsghdr *nlh,
|
| 1335 | u32 pid)
|
| 1336 | {
|
| 1337 | struct net *net;
|
| 1338 | struct sk_buff *skb;
|
| 1339 | int err = -ENOMEM;
|
| 1340 |
|
| 1341 | net = ops->fro_net;
|
| 1342 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
|
| 1343 | if (skb == NULL)
|
| 1344 | goto errout;
|
| 1345 |
|
| 1346 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
|
| 1347 | if (err < 0) {
|
| 1348 |
|
| 1349 | WARN_ON(err == -EMSGSIZE);
|
| 1350 | kfree_skb(skb);
|
| 1351 | goto errout;
|
| 1352 | }
|
| 1353 |
|
| 1354 | rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
|
| 1355 | return;
|
| 1356 | errout:
|
| 1357 | rtnl_set_sk_err(net, ops->nlgroup, err);
|
| 1358 | }
|
| 1359 |
|
| 1360 | static void attach_rules(struct list_head *rules, struct net_device *dev)
|
| 1361 | {
|
| 1362 | struct fib_rule *rule;
|
| 1363 |
|
| 1364 | list_for_each_entry(rule, rules, list) {
|
| 1365 | if (rule->iifindex == -1 &&
|
| 1366 | strcmp(dev->name, rule->iifname) == 0) {
|
| 1367 | WRITE_ONCE(rule->iifindex, dev->ifindex);
|
| 1368 | WRITE_ONCE(rule->iif_is_l3_master,
|
| 1369 | netif_is_l3_master(dev));
|
| 1370 | }
|
| 1371 | if (rule->oifindex == -1 &&
|
| 1372 | strcmp(dev->name, rule->oifname) == 0) {
|
| 1373 | WRITE_ONCE(rule->oifindex, dev->ifindex);
|
| 1374 | WRITE_ONCE(rule->oif_is_l3_master,
|
| 1375 | netif_is_l3_master(dev));
|
| 1376 | }
|
| 1377 | }
|
| 1378 | }
|
| 1379 |
|
| 1380 | static void detach_rules(struct list_head *rules, struct net_device *dev)
|
| 1381 | {
|
| 1382 | struct fib_rule *rule;
|
| 1383 |
|
| 1384 | list_for_each_entry(rule, rules, list) {
|
| 1385 | if (rule->iifindex == dev->ifindex) {
|
| 1386 | WRITE_ONCE(rule->iifindex, -1);
|
| 1387 | WRITE_ONCE(rule->iif_is_l3_master, false);
|
| 1388 | }
|
| 1389 | if (rule->oifindex == dev->ifindex) {
|
| 1390 | WRITE_ONCE(rule->oifindex, -1);
|
| 1391 | WRITE_ONCE(rule->oif_is_l3_master, false);
|
| 1392 | }
|
| 1393 | }
|
| 1394 | }
|
| 1395 |
|
| 1396 |
|
| 1397 | static int fib_rules_event(struct notifier_block *this, unsigned long event,
|
| 1398 | void *ptr)
|
| 1399 | {
|
| 1400 | struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
| 1401 | struct net *net = dev_net(dev);
|
| 1402 | struct fib_rules_ops *ops;
|
| 1403 |
|
| 1404 | switch (event) {
|
| 1405 | case NETDEV_REGISTER:
|
| 1406 | list_for_each_entry(ops, &net->rules_ops, list) {
|
| 1407 | mutex_lock(&ops->lock);
|
| 1408 | attach_rules(&ops->rules_list, dev);
|
| 1409 | mutex_unlock(&ops->lock);
|
| 1410 | }
|
| 1411 | break;
|
| 1412 |
|
| 1413 | case NETDEV_CHANGENAME:
|
| 1414 | list_for_each_entry(ops, &net->rules_ops, list) {
|
| 1415 | mutex_lock(&ops->lock);
|
| 1416 | detach_rules(&ops->rules_list, dev);
|
| 1417 | attach_rules(&ops->rules_list, dev);
|
| 1418 | mutex_unlock(&ops->lock);
|
| 1419 | }
|
| 1420 | break;
|
| 1421 |
|
| 1422 | case NETDEV_UNREGISTER:
|
| 1423 | list_for_each_entry(ops, &net->rules_ops, list) {
|
| 1424 | mutex_lock(&ops->lock);
|
| 1425 | detach_rules(&ops->rules_list, dev);
|
| 1426 | mutex_unlock(&ops->lock);
|
| 1427 | }
|
| 1428 | break;
|
| 1429 | }
|
| 1430 |
|
| 1431 | return NOTIFY_DONE;
|
| 1432 | }
|
| 1433 |
|
| 1434 | static struct notifier_block fib_rules_notifier = {
|
| 1435 | .notifier_call = fib_rules_event,
|
| 1436 | };
|
| 1437 |
|
| 1438 | static int __net_init fib_rules_net_init(struct net *net)
|
| 1439 | {
|
| 1440 | INIT_LIST_HEAD(&net->rules_ops);
|
| 1441 | spin_lock_init(&net->rules_mod_lock);
|
| 1442 | return 0;
|
| 1443 | }
|
| 1444 |
|
| 1445 | static void __net_exit fib_rules_net_exit(struct net *net)
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| 1446 | {
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| 1447 | WARN_ON_ONCE(!list_empty(&net->rules_ops));
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| 1448 | }
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| 1449 |
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| 1450 | static struct pernet_operations fib_rules_net_ops = {
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| 1451 | .init = fib_rules_net_init,
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| 1452 | .exit = fib_rules_net_exit,
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| 1453 | };
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| 1454 |
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| 1455 | static const struct rtnl_msg_handler fib_rules_rtnl_msg_handlers[] __initconst = {
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| 1456 | {.msgtype = RTM_NEWRULE, .doit = fib_nl_newrule,
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| 1457 | .flags = RTNL_FLAG_DOIT_PERNET},
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| 1458 | {.msgtype = RTM_DELRULE, .doit = fib_nl_delrule,
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| 1459 | .flags = RTNL_FLAG_DOIT_PERNET},
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| 1460 | {.msgtype = RTM_GETRULE, .dumpit = fib_nl_dumprule,
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| 1461 | .flags = RTNL_FLAG_DUMP_UNLOCKED},
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| 1462 | };
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| 1463 |
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| 1464 | static int __init fib_rules_init(void)
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| 1465 | {
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| 1466 | int err;
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| 1467 |
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| 1468 | rtnl_register_many(fib_rules_rtnl_msg_handlers);
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| 1469 |
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| 1470 | err = register_pernet_subsys(&fib_rules_net_ops);
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| 1471 | if (err < 0)
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| 1472 | goto fail;
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| 1473 |
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| 1474 | err = register_netdevice_notifier(&fib_rules_notifier);
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| 1475 | if (err < 0)
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| 1476 | goto fail_unregister;
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| 1477 |
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| 1478 | return 0;
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| 1479 |
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| 1480 | fail_unregister:
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| 1481 | unregister_pernet_subsys(&fib_rules_net_ops);
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| 1482 | fail:
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| 1483 | rtnl_unregister_many(fib_rules_rtnl_msg_handlers);
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| 1484 | return err;
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| 1485 | }
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| 1486 |
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| 1487 | subsys_initcall(fib_rules_init);
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