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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * net/core/fib_rules.c     Generic Routing Rules
0004  *
0005  * Authors: Thomas Graf <tgraf@suug.ch>
0006  */
0007 
0008 #include <linux/types.h>
0009 #include <linux/kernel.h>
0010 #include <linux/slab.h>
0011 #include <linux/list.h>
0012 #include <linux/module.h>
0013 #include <net/net_namespace.h>
0014 #include <net/sock.h>
0015 #include <net/fib_rules.h>
0016 #include <net/ip_tunnels.h>
0017 #include <linux/indirect_call_wrapper.h>
0018 
0019 #if defined(CONFIG_IPV6) && defined(CONFIG_IPV6_MULTIPLE_TABLES)
0020 #ifdef CONFIG_IP_MULTIPLE_TABLES
0021 #define INDIRECT_CALL_MT(f, f2, f1, ...) \
0022     INDIRECT_CALL_INET(f, f2, f1, __VA_ARGS__)
0023 #else
0024 #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__)
0025 #endif
0026 #elif defined(CONFIG_IP_MULTIPLE_TABLES)
0027 #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
0028 #else
0029 #define INDIRECT_CALL_MT(f, f2, f1, ...) f(__VA_ARGS__)
0030 #endif
0031 
0032 static const struct fib_kuid_range fib_kuid_range_unset = {
0033     KUIDT_INIT(0),
0034     KUIDT_INIT(~0),
0035 };
0036 
0037 bool fib_rule_matchall(const struct fib_rule *rule)
0038 {
0039     if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
0040         rule->flags)
0041         return false;
0042     if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
0043         return false;
0044     if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
0045         !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
0046         return false;
0047     if (fib_rule_port_range_set(&rule->sport_range))
0048         return false;
0049     if (fib_rule_port_range_set(&rule->dport_range))
0050         return false;
0051     return true;
0052 }
0053 EXPORT_SYMBOL_GPL(fib_rule_matchall);
0054 
0055 int fib_default_rule_add(struct fib_rules_ops *ops,
0056              u32 pref, u32 table, u32 flags)
0057 {
0058     struct fib_rule *r;
0059 
0060     r = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
0061     if (r == NULL)
0062         return -ENOMEM;
0063 
0064     refcount_set(&r->refcnt, 1);
0065     r->action = FR_ACT_TO_TBL;
0066     r->pref = pref;
0067     r->table = table;
0068     r->flags = flags;
0069     r->proto = RTPROT_KERNEL;
0070     r->fr_net = ops->fro_net;
0071     r->uid_range = fib_kuid_range_unset;
0072 
0073     r->suppress_prefixlen = -1;
0074     r->suppress_ifgroup = -1;
0075 
0076     /* The lock is not required here, the list in unreacheable
0077      * at the moment this function is called */
0078     list_add_tail(&r->list, &ops->rules_list);
0079     return 0;
0080 }
0081 EXPORT_SYMBOL(fib_default_rule_add);
0082 
0083 static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
0084 {
0085     struct list_head *pos;
0086     struct fib_rule *rule;
0087 
0088     if (!list_empty(&ops->rules_list)) {
0089         pos = ops->rules_list.next;
0090         if (pos->next != &ops->rules_list) {
0091             rule = list_entry(pos->next, struct fib_rule, list);
0092             if (rule->pref)
0093                 return rule->pref - 1;
0094         }
0095     }
0096 
0097     return 0;
0098 }
0099 
0100 static void notify_rule_change(int event, struct fib_rule *rule,
0101                    struct fib_rules_ops *ops, struct nlmsghdr *nlh,
0102                    u32 pid);
0103 
0104 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
0105 {
0106     struct fib_rules_ops *ops;
0107 
0108     rcu_read_lock();
0109     list_for_each_entry_rcu(ops, &net->rules_ops, list) {
0110         if (ops->family == family) {
0111             if (!try_module_get(ops->owner))
0112                 ops = NULL;
0113             rcu_read_unlock();
0114             return ops;
0115         }
0116     }
0117     rcu_read_unlock();
0118 
0119     return NULL;
0120 }
0121 
0122 static void rules_ops_put(struct fib_rules_ops *ops)
0123 {
0124     if (ops)
0125         module_put(ops->owner);
0126 }
0127 
0128 static void flush_route_cache(struct fib_rules_ops *ops)
0129 {
0130     if (ops->flush_cache)
0131         ops->flush_cache(ops);
0132 }
0133 
0134 static int __fib_rules_register(struct fib_rules_ops *ops)
0135 {
0136     int err = -EEXIST;
0137     struct fib_rules_ops *o;
0138     struct net *net;
0139 
0140     net = ops->fro_net;
0141 
0142     if (ops->rule_size < sizeof(struct fib_rule))
0143         return -EINVAL;
0144 
0145     if (ops->match == NULL || ops->configure == NULL ||
0146         ops->compare == NULL || ops->fill == NULL ||
0147         ops->action == NULL)
0148         return -EINVAL;
0149 
0150     spin_lock(&net->rules_mod_lock);
0151     list_for_each_entry(o, &net->rules_ops, list)
0152         if (ops->family == o->family)
0153             goto errout;
0154 
0155     list_add_tail_rcu(&ops->list, &net->rules_ops);
0156     err = 0;
0157 errout:
0158     spin_unlock(&net->rules_mod_lock);
0159 
0160     return err;
0161 }
0162 
0163 struct fib_rules_ops *
0164 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
0165 {
0166     struct fib_rules_ops *ops;
0167     int err;
0168 
0169     ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
0170     if (ops == NULL)
0171         return ERR_PTR(-ENOMEM);
0172 
0173     INIT_LIST_HEAD(&ops->rules_list);
0174     ops->fro_net = net;
0175 
0176     err = __fib_rules_register(ops);
0177     if (err) {
0178         kfree(ops);
0179         ops = ERR_PTR(err);
0180     }
0181 
0182     return ops;
0183 }
0184 EXPORT_SYMBOL_GPL(fib_rules_register);
0185 
0186 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
0187 {
0188     struct fib_rule *rule, *tmp;
0189 
0190     list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
0191         list_del_rcu(&rule->list);
0192         if (ops->delete)
0193             ops->delete(rule);
0194         fib_rule_put(rule);
0195     }
0196 }
0197 
0198 void fib_rules_unregister(struct fib_rules_ops *ops)
0199 {
0200     struct net *net = ops->fro_net;
0201 
0202     spin_lock(&net->rules_mod_lock);
0203     list_del_rcu(&ops->list);
0204     spin_unlock(&net->rules_mod_lock);
0205 
0206     fib_rules_cleanup_ops(ops);
0207     kfree_rcu(ops, rcu);
0208 }
0209 EXPORT_SYMBOL_GPL(fib_rules_unregister);
0210 
0211 static int uid_range_set(struct fib_kuid_range *range)
0212 {
0213     return uid_valid(range->start) && uid_valid(range->end);
0214 }
0215 
0216 static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
0217 {
0218     struct fib_rule_uid_range *in;
0219     struct fib_kuid_range out;
0220 
0221     in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
0222 
0223     out.start = make_kuid(current_user_ns(), in->start);
0224     out.end = make_kuid(current_user_ns(), in->end);
0225 
0226     return out;
0227 }
0228 
0229 static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
0230 {
0231     struct fib_rule_uid_range out = {
0232         from_kuid_munged(current_user_ns(), range->start),
0233         from_kuid_munged(current_user_ns(), range->end)
0234     };
0235 
0236     return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
0237 }
0238 
0239 static int nla_get_port_range(struct nlattr *pattr,
0240                   struct fib_rule_port_range *port_range)
0241 {
0242     const struct fib_rule_port_range *pr = nla_data(pattr);
0243 
0244     if (!fib_rule_port_range_valid(pr))
0245         return -EINVAL;
0246 
0247     port_range->start = pr->start;
0248     port_range->end = pr->end;
0249 
0250     return 0;
0251 }
0252 
0253 static int nla_put_port_range(struct sk_buff *skb, int attrtype,
0254                   struct fib_rule_port_range *range)
0255 {
0256     return nla_put(skb, attrtype, sizeof(*range), range);
0257 }
0258 
0259 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
0260               struct flowi *fl, int flags,
0261               struct fib_lookup_arg *arg)
0262 {
0263     int ret = 0;
0264 
0265     if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
0266         goto out;
0267 
0268     if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
0269         goto out;
0270 
0271     if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
0272         goto out;
0273 
0274     if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
0275         goto out;
0276 
0277     if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
0278         goto out;
0279 
0280     if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
0281         uid_gt(fl->flowi_uid, rule->uid_range.end))
0282         goto out;
0283 
0284     ret = INDIRECT_CALL_MT(ops->match,
0285                    fib6_rule_match,
0286                    fib4_rule_match,
0287                    rule, fl, flags);
0288 out:
0289     return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
0290 }
0291 
0292 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
0293              int flags, struct fib_lookup_arg *arg)
0294 {
0295     struct fib_rule *rule;
0296     int err;
0297 
0298     rcu_read_lock();
0299 
0300     list_for_each_entry_rcu(rule, &ops->rules_list, list) {
0301 jumped:
0302         if (!fib_rule_match(rule, ops, fl, flags, arg))
0303             continue;
0304 
0305         if (rule->action == FR_ACT_GOTO) {
0306             struct fib_rule *target;
0307 
0308             target = rcu_dereference(rule->ctarget);
0309             if (target == NULL) {
0310                 continue;
0311             } else {
0312                 rule = target;
0313                 goto jumped;
0314             }
0315         } else if (rule->action == FR_ACT_NOP)
0316             continue;
0317         else
0318             err = INDIRECT_CALL_MT(ops->action,
0319                            fib6_rule_action,
0320                            fib4_rule_action,
0321                            rule, fl, flags, arg);
0322 
0323         if (!err && ops->suppress && INDIRECT_CALL_MT(ops->suppress,
0324                                   fib6_rule_suppress,
0325                                   fib4_rule_suppress,
0326                                   rule, flags, arg))
0327             continue;
0328 
0329         if (err != -EAGAIN) {
0330             if ((arg->flags & FIB_LOOKUP_NOREF) ||
0331                 likely(refcount_inc_not_zero(&rule->refcnt))) {
0332                 arg->rule = rule;
0333                 goto out;
0334             }
0335             break;
0336         }
0337     }
0338 
0339     err = -ESRCH;
0340 out:
0341     rcu_read_unlock();
0342 
0343     return err;
0344 }
0345 EXPORT_SYMBOL_GPL(fib_rules_lookup);
0346 
0347 static int call_fib_rule_notifier(struct notifier_block *nb,
0348                   enum fib_event_type event_type,
0349                   struct fib_rule *rule, int family,
0350                   struct netlink_ext_ack *extack)
0351 {
0352     struct fib_rule_notifier_info info = {
0353         .info.family = family,
0354         .info.extack = extack,
0355         .rule = rule,
0356     };
0357 
0358     return call_fib_notifier(nb, event_type, &info.info);
0359 }
0360 
0361 static int call_fib_rule_notifiers(struct net *net,
0362                    enum fib_event_type event_type,
0363                    struct fib_rule *rule,
0364                    struct fib_rules_ops *ops,
0365                    struct netlink_ext_ack *extack)
0366 {
0367     struct fib_rule_notifier_info info = {
0368         .info.family = ops->family,
0369         .info.extack = extack,
0370         .rule = rule,
0371     };
0372 
0373     ops->fib_rules_seq++;
0374     return call_fib_notifiers(net, event_type, &info.info);
0375 }
0376 
0377 /* Called with rcu_read_lock() */
0378 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
0379            struct netlink_ext_ack *extack)
0380 {
0381     struct fib_rules_ops *ops;
0382     struct fib_rule *rule;
0383     int err = 0;
0384 
0385     ops = lookup_rules_ops(net, family);
0386     if (!ops)
0387         return -EAFNOSUPPORT;
0388     list_for_each_entry_rcu(rule, &ops->rules_list, list) {
0389         err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD,
0390                          rule, family, extack);
0391         if (err)
0392             break;
0393     }
0394     rules_ops_put(ops);
0395 
0396     return err;
0397 }
0398 EXPORT_SYMBOL_GPL(fib_rules_dump);
0399 
0400 unsigned int fib_rules_seq_read(struct net *net, int family)
0401 {
0402     unsigned int fib_rules_seq;
0403     struct fib_rules_ops *ops;
0404 
0405     ASSERT_RTNL();
0406 
0407     ops = lookup_rules_ops(net, family);
0408     if (!ops)
0409         return 0;
0410     fib_rules_seq = ops->fib_rules_seq;
0411     rules_ops_put(ops);
0412 
0413     return fib_rules_seq;
0414 }
0415 EXPORT_SYMBOL_GPL(fib_rules_seq_read);
0416 
0417 static struct fib_rule *rule_find(struct fib_rules_ops *ops,
0418                   struct fib_rule_hdr *frh,
0419                   struct nlattr **tb,
0420                   struct fib_rule *rule,
0421                   bool user_priority)
0422 {
0423     struct fib_rule *r;
0424 
0425     list_for_each_entry(r, &ops->rules_list, list) {
0426         if (rule->action && r->action != rule->action)
0427             continue;
0428 
0429         if (rule->table && r->table != rule->table)
0430             continue;
0431 
0432         if (user_priority && r->pref != rule->pref)
0433             continue;
0434 
0435         if (rule->iifname[0] &&
0436             memcmp(r->iifname, rule->iifname, IFNAMSIZ))
0437             continue;
0438 
0439         if (rule->oifname[0] &&
0440             memcmp(r->oifname, rule->oifname, IFNAMSIZ))
0441             continue;
0442 
0443         if (rule->mark && r->mark != rule->mark)
0444             continue;
0445 
0446         if (rule->suppress_ifgroup != -1 &&
0447             r->suppress_ifgroup != rule->suppress_ifgroup)
0448             continue;
0449 
0450         if (rule->suppress_prefixlen != -1 &&
0451             r->suppress_prefixlen != rule->suppress_prefixlen)
0452             continue;
0453 
0454         if (rule->mark_mask && r->mark_mask != rule->mark_mask)
0455             continue;
0456 
0457         if (rule->tun_id && r->tun_id != rule->tun_id)
0458             continue;
0459 
0460         if (r->fr_net != rule->fr_net)
0461             continue;
0462 
0463         if (rule->l3mdev && r->l3mdev != rule->l3mdev)
0464             continue;
0465 
0466         if (uid_range_set(&rule->uid_range) &&
0467             (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
0468             !uid_eq(r->uid_range.end, rule->uid_range.end)))
0469             continue;
0470 
0471         if (rule->ip_proto && r->ip_proto != rule->ip_proto)
0472             continue;
0473 
0474         if (rule->proto && r->proto != rule->proto)
0475             continue;
0476 
0477         if (fib_rule_port_range_set(&rule->sport_range) &&
0478             !fib_rule_port_range_compare(&r->sport_range,
0479                          &rule->sport_range))
0480             continue;
0481 
0482         if (fib_rule_port_range_set(&rule->dport_range) &&
0483             !fib_rule_port_range_compare(&r->dport_range,
0484                          &rule->dport_range))
0485             continue;
0486 
0487         if (!ops->compare(r, frh, tb))
0488             continue;
0489         return r;
0490     }
0491 
0492     return NULL;
0493 }
0494 
0495 #ifdef CONFIG_NET_L3_MASTER_DEV
0496 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
0497                   struct netlink_ext_ack *extack)
0498 {
0499     nlrule->l3mdev = nla_get_u8(nla);
0500     if (nlrule->l3mdev != 1) {
0501         NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
0502         return -1;
0503     }
0504 
0505     return 0;
0506 }
0507 #else
0508 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
0509                   struct netlink_ext_ack *extack)
0510 {
0511     NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
0512     return -1;
0513 }
0514 #endif
0515 
0516 static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
0517                struct netlink_ext_ack *extack,
0518                struct fib_rules_ops *ops,
0519                struct nlattr *tb[],
0520                struct fib_rule **rule,
0521                bool *user_priority)
0522 {
0523     struct net *net = sock_net(skb->sk);
0524     struct fib_rule_hdr *frh = nlmsg_data(nlh);
0525     struct fib_rule *nlrule = NULL;
0526     int err = -EINVAL;
0527 
0528     if (frh->src_len)
0529         if (!tb[FRA_SRC] ||
0530             frh->src_len > (ops->addr_size * 8) ||
0531             nla_len(tb[FRA_SRC]) != ops->addr_size) {
0532             NL_SET_ERR_MSG(extack, "Invalid source address");
0533             goto errout;
0534     }
0535 
0536     if (frh->dst_len)
0537         if (!tb[FRA_DST] ||
0538             frh->dst_len > (ops->addr_size * 8) ||
0539             nla_len(tb[FRA_DST]) != ops->addr_size) {
0540             NL_SET_ERR_MSG(extack, "Invalid dst address");
0541             goto errout;
0542     }
0543 
0544     nlrule = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
0545     if (!nlrule) {
0546         err = -ENOMEM;
0547         goto errout;
0548     }
0549     refcount_set(&nlrule->refcnt, 1);
0550     nlrule->fr_net = net;
0551 
0552     if (tb[FRA_PRIORITY]) {
0553         nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
0554         *user_priority = true;
0555     } else {
0556         nlrule->pref = fib_default_rule_pref(ops);
0557     }
0558 
0559     nlrule->proto = tb[FRA_PROTOCOL] ?
0560         nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
0561 
0562     if (tb[FRA_IIFNAME]) {
0563         struct net_device *dev;
0564 
0565         nlrule->iifindex = -1;
0566         nla_strscpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
0567         dev = __dev_get_by_name(net, nlrule->iifname);
0568         if (dev)
0569             nlrule->iifindex = dev->ifindex;
0570     }
0571 
0572     if (tb[FRA_OIFNAME]) {
0573         struct net_device *dev;
0574 
0575         nlrule->oifindex = -1;
0576         nla_strscpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
0577         dev = __dev_get_by_name(net, nlrule->oifname);
0578         if (dev)
0579             nlrule->oifindex = dev->ifindex;
0580     }
0581 
0582     if (tb[FRA_FWMARK]) {
0583         nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
0584         if (nlrule->mark)
0585             /* compatibility: if the mark value is non-zero all bits
0586              * are compared unless a mask is explicitly specified.
0587              */
0588             nlrule->mark_mask = 0xFFFFFFFF;
0589     }
0590 
0591     if (tb[FRA_FWMASK])
0592         nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
0593 
0594     if (tb[FRA_TUN_ID])
0595         nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
0596 
0597     err = -EINVAL;
0598     if (tb[FRA_L3MDEV] &&
0599         fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
0600         goto errout_free;
0601 
0602     nlrule->action = frh->action;
0603     nlrule->flags = frh->flags;
0604     nlrule->table = frh_get_table(frh, tb);
0605     if (tb[FRA_SUPPRESS_PREFIXLEN])
0606         nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
0607     else
0608         nlrule->suppress_prefixlen = -1;
0609 
0610     if (tb[FRA_SUPPRESS_IFGROUP])
0611         nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
0612     else
0613         nlrule->suppress_ifgroup = -1;
0614 
0615     if (tb[FRA_GOTO]) {
0616         if (nlrule->action != FR_ACT_GOTO) {
0617             NL_SET_ERR_MSG(extack, "Unexpected goto");
0618             goto errout_free;
0619         }
0620 
0621         nlrule->target = nla_get_u32(tb[FRA_GOTO]);
0622         /* Backward jumps are prohibited to avoid endless loops */
0623         if (nlrule->target <= nlrule->pref) {
0624             NL_SET_ERR_MSG(extack, "Backward goto not supported");
0625             goto errout_free;
0626         }
0627     } else if (nlrule->action == FR_ACT_GOTO) {
0628         NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
0629         goto errout_free;
0630     }
0631 
0632     if (nlrule->l3mdev && nlrule->table) {
0633         NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
0634         goto errout_free;
0635     }
0636 
0637     if (tb[FRA_UID_RANGE]) {
0638         if (current_user_ns() != net->user_ns) {
0639             err = -EPERM;
0640             NL_SET_ERR_MSG(extack, "No permission to set uid");
0641             goto errout_free;
0642         }
0643 
0644         nlrule->uid_range = nla_get_kuid_range(tb);
0645 
0646         if (!uid_range_set(&nlrule->uid_range) ||
0647             !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
0648             NL_SET_ERR_MSG(extack, "Invalid uid range");
0649             goto errout_free;
0650         }
0651     } else {
0652         nlrule->uid_range = fib_kuid_range_unset;
0653     }
0654 
0655     if (tb[FRA_IP_PROTO])
0656         nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
0657 
0658     if (tb[FRA_SPORT_RANGE]) {
0659         err = nla_get_port_range(tb[FRA_SPORT_RANGE],
0660                      &nlrule->sport_range);
0661         if (err) {
0662             NL_SET_ERR_MSG(extack, "Invalid sport range");
0663             goto errout_free;
0664         }
0665     }
0666 
0667     if (tb[FRA_DPORT_RANGE]) {
0668         err = nla_get_port_range(tb[FRA_DPORT_RANGE],
0669                      &nlrule->dport_range);
0670         if (err) {
0671             NL_SET_ERR_MSG(extack, "Invalid dport range");
0672             goto errout_free;
0673         }
0674     }
0675 
0676     *rule = nlrule;
0677 
0678     return 0;
0679 
0680 errout_free:
0681     kfree(nlrule);
0682 errout:
0683     return err;
0684 }
0685 
0686 static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
0687                struct nlattr **tb, struct fib_rule *rule)
0688 {
0689     struct fib_rule *r;
0690 
0691     list_for_each_entry(r, &ops->rules_list, list) {
0692         if (r->action != rule->action)
0693             continue;
0694 
0695         if (r->table != rule->table)
0696             continue;
0697 
0698         if (r->pref != rule->pref)
0699             continue;
0700 
0701         if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
0702             continue;
0703 
0704         if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
0705             continue;
0706 
0707         if (r->mark != rule->mark)
0708             continue;
0709 
0710         if (r->suppress_ifgroup != rule->suppress_ifgroup)
0711             continue;
0712 
0713         if (r->suppress_prefixlen != rule->suppress_prefixlen)
0714             continue;
0715 
0716         if (r->mark_mask != rule->mark_mask)
0717             continue;
0718 
0719         if (r->tun_id != rule->tun_id)
0720             continue;
0721 
0722         if (r->fr_net != rule->fr_net)
0723             continue;
0724 
0725         if (r->l3mdev != rule->l3mdev)
0726             continue;
0727 
0728         if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
0729             !uid_eq(r->uid_range.end, rule->uid_range.end))
0730             continue;
0731 
0732         if (r->ip_proto != rule->ip_proto)
0733             continue;
0734 
0735         if (r->proto != rule->proto)
0736             continue;
0737 
0738         if (!fib_rule_port_range_compare(&r->sport_range,
0739                          &rule->sport_range))
0740             continue;
0741 
0742         if (!fib_rule_port_range_compare(&r->dport_range,
0743                          &rule->dport_range))
0744             continue;
0745 
0746         if (!ops->compare(r, frh, tb))
0747             continue;
0748         return 1;
0749     }
0750     return 0;
0751 }
0752 
0753 static const struct nla_policy fib_rule_policy[FRA_MAX + 1] = {
0754     [FRA_UNSPEC]    = { .strict_start_type = FRA_DPORT_RANGE + 1 },
0755     [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
0756     [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
0757     [FRA_PRIORITY]  = { .type = NLA_U32 },
0758     [FRA_FWMARK]    = { .type = NLA_U32 },
0759     [FRA_FLOW]  = { .type = NLA_U32 },
0760     [FRA_TUN_ID]    = { .type = NLA_U64 },
0761     [FRA_FWMASK]    = { .type = NLA_U32 },
0762     [FRA_TABLE]     = { .type = NLA_U32 },
0763     [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 },
0764     [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 },
0765     [FRA_GOTO]  = { .type = NLA_U32 },
0766     [FRA_L3MDEV]    = { .type = NLA_U8 },
0767     [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) },
0768     [FRA_PROTOCOL]  = { .type = NLA_U8 },
0769     [FRA_IP_PROTO]  = { .type = NLA_U8 },
0770     [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
0771     [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
0772 };
0773 
0774 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
0775            struct netlink_ext_ack *extack)
0776 {
0777     struct net *net = sock_net(skb->sk);
0778     struct fib_rule_hdr *frh = nlmsg_data(nlh);
0779     struct fib_rules_ops *ops = NULL;
0780     struct fib_rule *rule = NULL, *r, *last = NULL;
0781     struct nlattr *tb[FRA_MAX + 1];
0782     int err = -EINVAL, unresolved = 0;
0783     bool user_priority = false;
0784 
0785     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
0786         NL_SET_ERR_MSG(extack, "Invalid msg length");
0787         goto errout;
0788     }
0789 
0790     ops = lookup_rules_ops(net, frh->family);
0791     if (!ops) {
0792         err = -EAFNOSUPPORT;
0793         NL_SET_ERR_MSG(extack, "Rule family not supported");
0794         goto errout;
0795     }
0796 
0797     err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
0798                      fib_rule_policy, extack);
0799     if (err < 0) {
0800         NL_SET_ERR_MSG(extack, "Error parsing msg");
0801         goto errout;
0802     }
0803 
0804     err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority);
0805     if (err)
0806         goto errout;
0807 
0808     if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
0809         rule_exists(ops, frh, tb, rule)) {
0810         err = -EEXIST;
0811         goto errout_free;
0812     }
0813 
0814     err = ops->configure(rule, skb, frh, tb, extack);
0815     if (err < 0)
0816         goto errout_free;
0817 
0818     err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
0819                       extack);
0820     if (err < 0)
0821         goto errout_free;
0822 
0823     list_for_each_entry(r, &ops->rules_list, list) {
0824         if (r->pref == rule->target) {
0825             RCU_INIT_POINTER(rule->ctarget, r);
0826             break;
0827         }
0828     }
0829 
0830     if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
0831         unresolved = 1;
0832 
0833     list_for_each_entry(r, &ops->rules_list, list) {
0834         if (r->pref > rule->pref)
0835             break;
0836         last = r;
0837     }
0838 
0839     if (last)
0840         list_add_rcu(&rule->list, &last->list);
0841     else
0842         list_add_rcu(&rule->list, &ops->rules_list);
0843 
0844     if (ops->unresolved_rules) {
0845         /*
0846          * There are unresolved goto rules in the list, check if
0847          * any of them are pointing to this new rule.
0848          */
0849         list_for_each_entry(r, &ops->rules_list, list) {
0850             if (r->action == FR_ACT_GOTO &&
0851                 r->target == rule->pref &&
0852                 rtnl_dereference(r->ctarget) == NULL) {
0853                 rcu_assign_pointer(r->ctarget, rule);
0854                 if (--ops->unresolved_rules == 0)
0855                     break;
0856             }
0857         }
0858     }
0859 
0860     if (rule->action == FR_ACT_GOTO)
0861         ops->nr_goto_rules++;
0862 
0863     if (unresolved)
0864         ops->unresolved_rules++;
0865 
0866     if (rule->tun_id)
0867         ip_tunnel_need_metadata();
0868 
0869     notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
0870     flush_route_cache(ops);
0871     rules_ops_put(ops);
0872     return 0;
0873 
0874 errout_free:
0875     kfree(rule);
0876 errout:
0877     rules_ops_put(ops);
0878     return err;
0879 }
0880 EXPORT_SYMBOL_GPL(fib_nl_newrule);
0881 
0882 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
0883            struct netlink_ext_ack *extack)
0884 {
0885     struct net *net = sock_net(skb->sk);
0886     struct fib_rule_hdr *frh = nlmsg_data(nlh);
0887     struct fib_rules_ops *ops = NULL;
0888     struct fib_rule *rule = NULL, *r, *nlrule = NULL;
0889     struct nlattr *tb[FRA_MAX+1];
0890     int err = -EINVAL;
0891     bool user_priority = false;
0892 
0893     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
0894         NL_SET_ERR_MSG(extack, "Invalid msg length");
0895         goto errout;
0896     }
0897 
0898     ops = lookup_rules_ops(net, frh->family);
0899     if (ops == NULL) {
0900         err = -EAFNOSUPPORT;
0901         NL_SET_ERR_MSG(extack, "Rule family not supported");
0902         goto errout;
0903     }
0904 
0905     err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
0906                      fib_rule_policy, extack);
0907     if (err < 0) {
0908         NL_SET_ERR_MSG(extack, "Error parsing msg");
0909         goto errout;
0910     }
0911 
0912     err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority);
0913     if (err)
0914         goto errout;
0915 
0916     rule = rule_find(ops, frh, tb, nlrule, user_priority);
0917     if (!rule) {
0918         err = -ENOENT;
0919         goto errout;
0920     }
0921 
0922     if (rule->flags & FIB_RULE_PERMANENT) {
0923         err = -EPERM;
0924         goto errout;
0925     }
0926 
0927     if (ops->delete) {
0928         err = ops->delete(rule);
0929         if (err)
0930             goto errout;
0931     }
0932 
0933     if (rule->tun_id)
0934         ip_tunnel_unneed_metadata();
0935 
0936     list_del_rcu(&rule->list);
0937 
0938     if (rule->action == FR_ACT_GOTO) {
0939         ops->nr_goto_rules--;
0940         if (rtnl_dereference(rule->ctarget) == NULL)
0941             ops->unresolved_rules--;
0942     }
0943 
0944     /*
0945      * Check if this rule is a target to any of them. If so,
0946      * adjust to the next one with the same preference or
0947      * disable them. As this operation is eventually very
0948      * expensive, it is only performed if goto rules, except
0949      * current if it is goto rule, have actually been added.
0950      */
0951     if (ops->nr_goto_rules > 0) {
0952         struct fib_rule *n;
0953 
0954         n = list_next_entry(rule, list);
0955         if (&n->list == &ops->rules_list || n->pref != rule->pref)
0956             n = NULL;
0957         list_for_each_entry(r, &ops->rules_list, list) {
0958             if (rtnl_dereference(r->ctarget) != rule)
0959                 continue;
0960             rcu_assign_pointer(r->ctarget, n);
0961             if (!n)
0962                 ops->unresolved_rules++;
0963         }
0964     }
0965 
0966     call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
0967                 NULL);
0968     notify_rule_change(RTM_DELRULE, rule, ops, nlh,
0969                NETLINK_CB(skb).portid);
0970     fib_rule_put(rule);
0971     flush_route_cache(ops);
0972     rules_ops_put(ops);
0973     kfree(nlrule);
0974     return 0;
0975 
0976 errout:
0977     kfree(nlrule);
0978     rules_ops_put(ops);
0979     return err;
0980 }
0981 EXPORT_SYMBOL_GPL(fib_nl_delrule);
0982 
0983 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
0984                      struct fib_rule *rule)
0985 {
0986     size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
0987              + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
0988              + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
0989              + nla_total_size(4) /* FRA_PRIORITY */
0990              + nla_total_size(4) /* FRA_TABLE */
0991              + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
0992              + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
0993              + nla_total_size(4) /* FRA_FWMARK */
0994              + nla_total_size(4) /* FRA_FWMASK */
0995              + nla_total_size_64bit(8) /* FRA_TUN_ID */
0996              + nla_total_size(sizeof(struct fib_kuid_range))
0997              + nla_total_size(1) /* FRA_PROTOCOL */
0998              + nla_total_size(1) /* FRA_IP_PROTO */
0999              + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */
1000              + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */
1001 
1002     if (ops->nlmsg_payload)
1003         payload += ops->nlmsg_payload(rule);
1004 
1005     return payload;
1006 }
1007 
1008 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
1009                 u32 pid, u32 seq, int type, int flags,
1010                 struct fib_rules_ops *ops)
1011 {
1012     struct nlmsghdr *nlh;
1013     struct fib_rule_hdr *frh;
1014 
1015     nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
1016     if (nlh == NULL)
1017         return -EMSGSIZE;
1018 
1019     frh = nlmsg_data(nlh);
1020     frh->family = ops->family;
1021     frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT;
1022     if (nla_put_u32(skb, FRA_TABLE, rule->table))
1023         goto nla_put_failure;
1024     if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
1025         goto nla_put_failure;
1026     frh->res1 = 0;
1027     frh->res2 = 0;
1028     frh->action = rule->action;
1029     frh->flags = rule->flags;
1030 
1031     if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
1032         goto nla_put_failure;
1033 
1034     if (rule->action == FR_ACT_GOTO &&
1035         rcu_access_pointer(rule->ctarget) == NULL)
1036         frh->flags |= FIB_RULE_UNRESOLVED;
1037 
1038     if (rule->iifname[0]) {
1039         if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
1040             goto nla_put_failure;
1041         if (rule->iifindex == -1)
1042             frh->flags |= FIB_RULE_IIF_DETACHED;
1043     }
1044 
1045     if (rule->oifname[0]) {
1046         if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
1047             goto nla_put_failure;
1048         if (rule->oifindex == -1)
1049             frh->flags |= FIB_RULE_OIF_DETACHED;
1050     }
1051 
1052     if ((rule->pref &&
1053          nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
1054         (rule->mark &&
1055          nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
1056         ((rule->mark_mask || rule->mark) &&
1057          nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
1058         (rule->target &&
1059          nla_put_u32(skb, FRA_GOTO, rule->target)) ||
1060         (rule->tun_id &&
1061          nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
1062         (rule->l3mdev &&
1063          nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
1064         (uid_range_set(&rule->uid_range) &&
1065          nla_put_uid_range(skb, &rule->uid_range)) ||
1066         (fib_rule_port_range_set(&rule->sport_range) &&
1067          nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
1068         (fib_rule_port_range_set(&rule->dport_range) &&
1069          nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
1070         (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
1071         goto nla_put_failure;
1072 
1073     if (rule->suppress_ifgroup != -1) {
1074         if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
1075             goto nla_put_failure;
1076     }
1077 
1078     if (ops->fill(rule, skb, frh) < 0)
1079         goto nla_put_failure;
1080 
1081     nlmsg_end(skb, nlh);
1082     return 0;
1083 
1084 nla_put_failure:
1085     nlmsg_cancel(skb, nlh);
1086     return -EMSGSIZE;
1087 }
1088 
1089 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
1090               struct fib_rules_ops *ops)
1091 {
1092     int idx = 0;
1093     struct fib_rule *rule;
1094     int err = 0;
1095 
1096     rcu_read_lock();
1097     list_for_each_entry_rcu(rule, &ops->rules_list, list) {
1098         if (idx < cb->args[1])
1099             goto skip;
1100 
1101         err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
1102                        cb->nlh->nlmsg_seq, RTM_NEWRULE,
1103                        NLM_F_MULTI, ops);
1104         if (err)
1105             break;
1106 skip:
1107         idx++;
1108     }
1109     rcu_read_unlock();
1110     cb->args[1] = idx;
1111     rules_ops_put(ops);
1112 
1113     return err;
1114 }
1115 
1116 static int fib_valid_dumprule_req(const struct nlmsghdr *nlh,
1117                    struct netlink_ext_ack *extack)
1118 {
1119     struct fib_rule_hdr *frh;
1120 
1121     if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
1122         NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request");
1123         return -EINVAL;
1124     }
1125 
1126     frh = nlmsg_data(nlh);
1127     if (frh->dst_len || frh->src_len || frh->tos || frh->table ||
1128         frh->res1 || frh->res2 || frh->action || frh->flags) {
1129         NL_SET_ERR_MSG(extack,
1130                    "Invalid values in header for fib rule dump request");
1131         return -EINVAL;
1132     }
1133 
1134     if (nlmsg_attrlen(nlh, sizeof(*frh))) {
1135         NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request");
1136         return -EINVAL;
1137     }
1138 
1139     return 0;
1140 }
1141 
1142 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
1143 {
1144     const struct nlmsghdr *nlh = cb->nlh;
1145     struct net *net = sock_net(skb->sk);
1146     struct fib_rules_ops *ops;
1147     int idx = 0, family;
1148 
1149     if (cb->strict_check) {
1150         int err = fib_valid_dumprule_req(nlh, cb->extack);
1151 
1152         if (err < 0)
1153             return err;
1154     }
1155 
1156     family = rtnl_msg_family(nlh);
1157     if (family != AF_UNSPEC) {
1158         /* Protocol specific dump request */
1159         ops = lookup_rules_ops(net, family);
1160         if (ops == NULL)
1161             return -EAFNOSUPPORT;
1162 
1163         dump_rules(skb, cb, ops);
1164 
1165         return skb->len;
1166     }
1167 
1168     rcu_read_lock();
1169     list_for_each_entry_rcu(ops, &net->rules_ops, list) {
1170         if (idx < cb->args[0] || !try_module_get(ops->owner))
1171             goto skip;
1172 
1173         if (dump_rules(skb, cb, ops) < 0)
1174             break;
1175 
1176         cb->args[1] = 0;
1177 skip:
1178         idx++;
1179     }
1180     rcu_read_unlock();
1181     cb->args[0] = idx;
1182 
1183     return skb->len;
1184 }
1185 
1186 static void notify_rule_change(int event, struct fib_rule *rule,
1187                    struct fib_rules_ops *ops, struct nlmsghdr *nlh,
1188                    u32 pid)
1189 {
1190     struct net *net;
1191     struct sk_buff *skb;
1192     int err = -ENOMEM;
1193 
1194     net = ops->fro_net;
1195     skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
1196     if (skb == NULL)
1197         goto errout;
1198 
1199     err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
1200     if (err < 0) {
1201         /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
1202         WARN_ON(err == -EMSGSIZE);
1203         kfree_skb(skb);
1204         goto errout;
1205     }
1206 
1207     rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1208     return;
1209 errout:
1210     if (err < 0)
1211         rtnl_set_sk_err(net, ops->nlgroup, err);
1212 }
1213 
1214 static void attach_rules(struct list_head *rules, struct net_device *dev)
1215 {
1216     struct fib_rule *rule;
1217 
1218     list_for_each_entry(rule, rules, list) {
1219         if (rule->iifindex == -1 &&
1220             strcmp(dev->name, rule->iifname) == 0)
1221             rule->iifindex = dev->ifindex;
1222         if (rule->oifindex == -1 &&
1223             strcmp(dev->name, rule->oifname) == 0)
1224             rule->oifindex = dev->ifindex;
1225     }
1226 }
1227 
1228 static void detach_rules(struct list_head *rules, struct net_device *dev)
1229 {
1230     struct fib_rule *rule;
1231 
1232     list_for_each_entry(rule, rules, list) {
1233         if (rule->iifindex == dev->ifindex)
1234             rule->iifindex = -1;
1235         if (rule->oifindex == dev->ifindex)
1236             rule->oifindex = -1;
1237     }
1238 }
1239 
1240 
1241 static int fib_rules_event(struct notifier_block *this, unsigned long event,
1242                void *ptr)
1243 {
1244     struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1245     struct net *net = dev_net(dev);
1246     struct fib_rules_ops *ops;
1247 
1248     ASSERT_RTNL();
1249 
1250     switch (event) {
1251     case NETDEV_REGISTER:
1252         list_for_each_entry(ops, &net->rules_ops, list)
1253             attach_rules(&ops->rules_list, dev);
1254         break;
1255 
1256     case NETDEV_CHANGENAME:
1257         list_for_each_entry(ops, &net->rules_ops, list) {
1258             detach_rules(&ops->rules_list, dev);
1259             attach_rules(&ops->rules_list, dev);
1260         }
1261         break;
1262 
1263     case NETDEV_UNREGISTER:
1264         list_for_each_entry(ops, &net->rules_ops, list)
1265             detach_rules(&ops->rules_list, dev);
1266         break;
1267     }
1268 
1269     return NOTIFY_DONE;
1270 }
1271 
1272 static struct notifier_block fib_rules_notifier = {
1273     .notifier_call = fib_rules_event,
1274 };
1275 
1276 static int __net_init fib_rules_net_init(struct net *net)
1277 {
1278     INIT_LIST_HEAD(&net->rules_ops);
1279     spin_lock_init(&net->rules_mod_lock);
1280     return 0;
1281 }
1282 
1283 static void __net_exit fib_rules_net_exit(struct net *net)
1284 {
1285     WARN_ON_ONCE(!list_empty(&net->rules_ops));
1286 }
1287 
1288 static struct pernet_operations fib_rules_net_ops = {
1289     .init = fib_rules_net_init,
1290     .exit = fib_rules_net_exit,
1291 };
1292 
1293 static int __init fib_rules_init(void)
1294 {
1295     int err;
1296     rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1297     rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1298     rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
1299 
1300     err = register_pernet_subsys(&fib_rules_net_ops);
1301     if (err < 0)
1302         goto fail;
1303 
1304     err = register_netdevice_notifier(&fib_rules_notifier);
1305     if (err < 0)
1306         goto fail_unregister;
1307 
1308     return 0;
1309 
1310 fail_unregister:
1311     unregister_pernet_subsys(&fib_rules_net_ops);
1312 fail:
1313     rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1314     rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1315     rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1316     return err;
1317 }
1318 
1319 subsys_initcall(fib_rules_init);
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