text: /*
   * net/core/fib_rules.c		Generic Routing Rules
   *
   *	This program is free software; you can redistribute it and/or
   *	modify it under the terms of the GNU General Public License as
   *	published by the Free Software Foundation, version 2.
   *
   * Authors:	Thomas Graf <tgraf@suug.ch>
   */
  
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/list.h>
  #include <net/net_namespace.h>
  #include <net/sock.h>
  #include <net/fib_rules.h>
  
  int fib_default_rule_add(struct fib_rules_ops *ops,
  			 u32 pref, u32 table, u32 flags)
  {
  	struct fib_rule *r;
  
  	r = kzalloc(ops->rule_size, GFP_KERNEL);
  	if (r == NULL)
  		return -ENOMEM;
  
  	atomic_set(&r->refcnt, 1);
  	r->action = FR_ACT_TO_TBL;
  	r->pref = pref;
  	r->table = table;
  	r->flags = flags;
  	r->fr_net = hold_net(ops->fro_net);
  
  	/* The lock is not required here, the list in unreacheable
  	 * at the moment this function is called */
  	list_add_tail(&r->list, &ops->rules_list);
  	return 0;
  }
  EXPORT_SYMBOL(fib_default_rule_add);
  
  u32 fib_default_rule_pref(struct fib_rules_ops *ops)
  {
  	struct list_head *pos;
  	struct fib_rule *rule;
  
  	if (!list_empty(&ops->rules_list)) {
  		pos = ops->rules_list.next;
  		if (pos->next != &ops->rules_list) {
  			rule = list_entry(pos->next, struct fib_rule, list);
  			if (rule->pref)
  				return rule->pref - 1;
  		}
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL(fib_default_rule_pref);
  
  static void notify_rule_change(int event, struct fib_rule *rule,
  			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
  			       u32 pid);
  
  static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
  {
  	struct fib_rules_ops *ops;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
  		if (ops->family == family) {
  			if (!try_module_get(ops->owner))
  				ops = NULL;
  			rcu_read_unlock();
  			return ops;
  		}
  	}
  	rcu_read_unlock();
  
  	return NULL;
  }
  
  static void rules_ops_put(struct fib_rules_ops *ops)
  {
  	if (ops)
  		module_put(ops->owner);
  }
  
  static void flush_route_cache(struct fib_rules_ops *ops)
  {
  	if (ops->flush_cache)
  		ops->flush_cache(ops);
  }
  
  static int __fib_rules_register(struct fib_rules_ops *ops)
  {
  	int err = -EEXIST;
  	struct fib_rules_ops *o;
  	struct net *net;
  
  	net = ops->fro_net;
  
  	if (ops->rule_size < sizeof(struct fib_rule))
  		return -EINVAL;
  
  	if (ops->match == NULL || ops->configure == NULL ||
  	    ops->compare == NULL || ops->fill == NULL ||
  	    ops->action == NULL)
  		return -EINVAL;
  
  	spin_lock(&net->rules_mod_lock);
  	list_for_each_entry(o, &net->rules_ops, list)
  		if (ops->family == o->family)
  			goto errout;
  
  	hold_net(net);
  	list_add_tail_rcu(&ops->list, &net->rules_ops);
  	err = 0;
  errout:
  	spin_unlock(&net->rules_mod_lock);
  
  	return err;
  }
  
  struct fib_rules_ops *
  fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
  {
  	struct fib_rules_ops *ops;
  	int err;
  
  	ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
  	if (ops == NULL)
  		return ERR_PTR(-ENOMEM);
  
  	INIT_LIST_HEAD(&ops->rules_list);
  	ops->fro_net = net;
  
  	err = __fib_rules_register(ops);
  	if (err) {
  		kfree(ops);
  		ops = ERR_PTR(err);
  	}
  
  	return ops;
  }
  EXPORT_SYMBOL_GPL(fib_rules_register);
  
  static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
  {
  	struct fib_rule *rule, *tmp;
  
  	list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
  		list_del_rcu(&rule->list);
  		fib_rule_put(rule);
  	}
  }
  
  static void fib_rules_put_rcu(struct rcu_head *head)
  {
  	struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
  	struct net *net = ops->fro_net;
  
  	release_net(net);
  	kfree(ops);
  }
  
  void fib_rules_unregister(struct fib_rules_ops *ops)
  {
  	struct net *net = ops->fro_net;
  
  	spin_lock(&net->rules_mod_lock);
  	list_del_rcu(&ops->list);
  	fib_rules_cleanup_ops(ops);
  	spin_unlock(&net->rules_mod_lock);
  
  	call_rcu(&ops->rcu, fib_rules_put_rcu);
  }
  EXPORT_SYMBOL_GPL(fib_rules_unregister);
  
  static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
  			  struct flowi *fl, int flags)
  {
  	int ret = 0;
  
  	if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
  		goto out;
  
  	if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
  		goto out;
  
  	if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
  		goto out;
  
  	ret = ops->match(rule, fl, flags);
  out:
  	return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
  }
  
  int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
  		     int flags, struct fib_lookup_arg *arg)
  {
  	struct fib_rule *rule;
  	int err;
  
  	rcu_read_lock();
  
  	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
  jumped:
  		if (!fib_rule_match(rule, ops, fl, flags))
  			continue;
  
  		if (rule->action == FR_ACT_GOTO) {
  			struct fib_rule *target;
  
  			target = rcu_dereference(rule->ctarget);
  			if (target == NULL) {
  				continue;
  			} else {
  				rule = target;
  				goto jumped;
  			}
  		} else if (rule->action == FR_ACT_NOP)
  			continue;
  		else
  			err = ops->action(rule, fl, flags, arg);
  
  		if (err != -EAGAIN) {
  			if ((arg->flags & FIB_LOOKUP_NOREF) ||
  			    likely(atomic_inc_not_zero(&rule->refcnt))) {
  				arg->rule = rule;
  				goto out;
  			}
  			break;
  		}
  	}
  
  	err = -ESRCH;
  out:
  	rcu_read_unlock();
  
  	return err;
  }
  EXPORT_SYMBOL_GPL(fib_rules_lookup);
  
  static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
  			    struct fib_rules_ops *ops)
  {
  	int err = -EINVAL;
  
  	if (frh->src_len)
  		if (tb[FRA_SRC] == NULL ||
  		    frh->src_len > (ops->addr_size * 8) ||
  		    nla_len(tb[FRA_SRC]) != ops->addr_size)
  			goto errout;
  
  	if (frh->dst_len)
  		if (tb[FRA_DST] == NULL ||
  		    frh->dst_len > (ops->addr_size * 8) ||
  		    nla_len(tb[FRA_DST]) != ops->addr_size)
  			goto errout;
  
  	err = 0;
  errout:
  	return err;
  }
  
  static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
  {
  	struct net *net = sock_net(skb->sk);
  	struct fib_rule_hdr *frh = nlmsg_data(nlh);
  	struct fib_rules_ops *ops = NULL;
  	struct fib_rule *rule, *r, *last = NULL;
  	struct nlattr *tb[FRA_MAX+1];
  	int err = -EINVAL, unresolved = 0;
  
  	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
  		goto errout;
  
  	ops = lookup_rules_ops(net, frh->family);
  	if (ops == NULL) {
  		err = -EAFNOSUPPORT;
  		goto errout;
  	}
  
  	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
  	if (err < 0)
  		goto errout;
  
  	err = validate_rulemsg(frh, tb, ops);
  	if (err < 0)
  		goto errout;
  
  	rule = kzalloc(ops->rule_size, GFP_KERNEL);
  	if (rule == NULL) {
  		err = -ENOMEM;
  		goto errout;
  	}
  	rule->fr_net = hold_net(net);
  
  	if (tb[FRA_PRIORITY])
  		rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
  
  	if (tb[FRA_IIFNAME]) {
  		struct net_device *dev;
  
  		rule->iifindex = -1;
  		nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
  		dev = __dev_get_by_name(net, rule->iifname);
  		if (dev)
  			rule->iifindex = dev->ifindex;
  	}
  
  	if (tb[FRA_OIFNAME]) {
  		struct net_device *dev;
  
  		rule->oifindex = -1;
  		nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
  		dev = __dev_get_by_name(net, rule->oifname);
  		if (dev)
  			rule->oifindex = dev->ifindex;
  	}
  
  	if (tb[FRA_FWMARK]) {
  		rule->mark = nla_get_u32(tb[FRA_FWMARK]);
  		if (rule->mark)
  			/* compatibility: if the mark value is non-zero all bits
  			 * are compared unless a mask is explicitly specified.
  			 */
  			rule->mark_mask = 0xFFFFFFFF;
  	}
  
  	if (tb[FRA_FWMASK])
  		rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
  
  	rule->action = frh->action;
  	rule->flags = frh->flags;
  	rule->table = frh_get_table(frh, tb);
  
  	if (!tb[FRA_PRIORITY] && ops->default_pref)
  		rule->pref = ops->default_pref(ops);
  
  	err = -EINVAL;
  	if (tb[FRA_GOTO]) {
  		if (rule->action != FR_ACT_GOTO)
  			goto errout_free;
  
  		rule->target = nla_get_u32(tb[FRA_GOTO]);
  		/* Backward jumps are prohibited to avoid endless loops */
  		if (rule->target <= rule->pref)
  			goto errout_free;
  
  		list_for_each_entry(r, &ops->rules_list, list) {
  			if (r->pref == rule->target) {
  				RCU_INIT_POINTER(rule->ctarget, r);
  				break;
  			}
  		}
  
  		if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
  			unresolved = 1;
  	} else if (rule->action == FR_ACT_GOTO)
  		goto errout_free;
  
  	err = ops->configure(rule, skb, frh, tb);
  	if (err < 0)
  		goto errout_free;
  
  	list_for_each_entry(r, &ops->rules_list, list) {
  		if (r->pref > rule->pref)
  			break;
  		last = r;
  	}
  
  	fib_rule_get(rule);
  
  	if (last)
  		list_add_rcu(&rule->list, &last->list);
  	else
  		list_add_rcu(&rule->list, &ops->rules_list);
  
  	if (ops->unresolved_rules) {
  		/*
  		 * There are unresolved goto rules in the list, check if
  		 * any of them are pointing to this new rule.
  		 */
  		list_for_each_entry(r, &ops->rules_list, list) {
  			if (r->action == FR_ACT_GOTO &&
  			    r->target == rule->pref &&
  			    rtnl_dereference(r->ctarget) == NULL) {
  				rcu_assign_pointer(r->ctarget, rule);
  				if (--ops->unresolved_rules == 0)
  					break;
  			}
  		}
  	}
  
  	if (rule->action == FR_ACT_GOTO)
  		ops->nr_goto_rules++;
  
  	if (unresolved)
  		ops->unresolved_rules++;
  
  	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
  	flush_route_cache(ops);
  	rules_ops_put(ops);
  	return 0;
  
  errout_free:
  	release_net(rule->fr_net);
  	kfree(rule);
  errout:
  	rules_ops_put(ops);
  	return err;
  }
  
  static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
  {
  	struct net *net = sock_net(skb->sk);
  	struct fib_rule_hdr *frh = nlmsg_data(nlh);
  	struct fib_rules_ops *ops = NULL;
  	struct fib_rule *rule, *tmp;
  	struct nlattr *tb[FRA_MAX+1];
  	int err = -EINVAL;
  
  	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
  		goto errout;
  
  	ops = lookup_rules_ops(net, frh->family);
  	if (ops == NULL) {
  		err = -EAFNOSUPPORT;
  		goto errout;
  	}
  
  	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
  	if (err < 0)
  		goto errout;
  
  	err = validate_rulemsg(frh, tb, ops);
  	if (err < 0)
  		goto errout;
  
  	list_for_each_entry(rule, &ops->rules_list, list) {
  		if (frh->action && (frh->action != rule->action))
  			continue;
  
  		if (frh->table && (frh_get_table(frh, tb) != rule->table))
  			continue;
  
  		if (tb[FRA_PRIORITY] &&
  		    (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
  			continue;
  
  		if (tb[FRA_IIFNAME] &&
  		    nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
  			continue;
  
  		if (tb[FRA_OIFNAME] &&
  		    nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
  			continue;
  
  		if (tb[FRA_FWMARK] &&
  		    (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
  			continue;
  
  		if (tb[FRA_FWMASK] &&
  		    (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
  			continue;
  
  		if (!ops->compare(rule, frh, tb))
  			continue;
  
  		if (rule->flags & FIB_RULE_PERMANENT) {
  			err = -EPERM;
  			goto errout;
  		}
  
  		list_del_rcu(&rule->list);
  
  		if (rule->action == FR_ACT_GOTO)
  			ops->nr_goto_rules--;
  
  		/*
  		 * Check if this rule is a target to any of them. If so,
  		 * disable them. As this operation is eventually very
  		 * expensive, it is only performed if goto rules have
  		 * actually been added.
  		 */
  		if (ops->nr_goto_rules > 0) {
  			list_for_each_entry(tmp, &ops->rules_list, list) {
  				if (rtnl_dereference(tmp->ctarget) == rule) {
  					rcu_assign_pointer(tmp->ctarget, NULL);
  					ops->unresolved_rules++;
  				}
  			}
  		}
  
  		notify_rule_change(RTM_DELRULE, rule, ops, nlh,
  				   NETLINK_CB(skb).pid);
  		fib_rule_put(rule);
  		flush_route_cache(ops);
  		rules_ops_put(ops);
  		return 0;
  	}
  
  	err = -ENOENT;
  errout:
  	rules_ops_put(ops);
  	return err;
  }
  
  static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
  					 struct fib_rule *rule)
  {
  	size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
  			 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
  			 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
  			 + nla_total_size(4) /* FRA_PRIORITY */
  			 + nla_total_size(4) /* FRA_TABLE */
  			 + nla_total_size(4) /* FRA_FWMARK */
  			 + nla_total_size(4); /* FRA_FWMASK */
  
  	if (ops->nlmsg_payload)
  		payload += ops->nlmsg_payload(rule);
  
  	return payload;
  }
  
  static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
  			    u32 pid, u32 seq, int type, int flags,
  			    struct fib_rules_ops *ops)
  {
  	struct nlmsghdr *nlh;
  	struct fib_rule_hdr *frh;
  
  	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
  	if (nlh == NULL)
  		return -EMSGSIZE;
  
  	frh = nlmsg_data(nlh);
  	frh->family = ops->family;
  	frh->table = rule->table;
  	NLA_PUT_U32(skb, FRA_TABLE, rule->table);
  	frh->res1 = 0;
  	frh->res2 = 0;
  	frh->action = rule->action;
  	frh->flags = rule->flags;
  
  	if (rule->action == FR_ACT_GOTO &&
  	    rcu_dereference_raw(rule->ctarget) == NULL)
  		frh->flags |= FIB_RULE_UNRESOLVED;
  
  	if (rule->iifname[0]) {
  		NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
  
  		if (rule->iifindex == -1)
  			frh->flags |= FIB_RULE_IIF_DETACHED;
  	}
  
  	if (rule->oifname[0]) {
  		NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
  
  		if (rule->oifindex == -1)
  			frh->flags |= FIB_RULE_OIF_DETACHED;
  	}
  
  	if (rule->pref)
  		NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
  
  	if (rule->mark)
  		NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
  
  	if (rule->mark_mask || rule->mark)
  		NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
  
  	if (rule->target)
  		NLA_PUT_U32(skb, FRA_GOTO, rule->target);
  
  	if (ops->fill(rule, skb, frh) < 0)
  		goto nla_put_failure;
  
  	return nlmsg_end(skb, nlh);
  
  nla_put_failure:
  	nlmsg_cancel(skb, nlh);
  	return -EMSGSIZE;
  }
  
  static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
  		      struct fib_rules_ops *ops)
  {
  	int idx = 0;
  	struct fib_rule *rule;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
  		if (idx < cb->args[1])
  			goto skip;
  
  		if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
  				     cb->nlh->nlmsg_seq, RTM_NEWRULE,
  				     NLM_F_MULTI, ops) < 0)
  			break;
  skip:
  		idx++;
  	}
  	rcu_read_unlock();
  	cb->args[1] = idx;
  	rules_ops_put(ops);
  
  	return skb->len;
  }
  
  static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
  {
  	struct net *net = sock_net(skb->sk);
  	struct fib_rules_ops *ops;
  	int idx = 0, family;
  
  	family = rtnl_msg_family(cb->nlh);
  	if (family != AF_UNSPEC) {
  		/* Protocol specific dump request */
  		ops = lookup_rules_ops(net, family);
  		if (ops == NULL)
  			return -EAFNOSUPPORT;
  
  		return dump_rules(skb, cb, ops);
  	}
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
  		if (idx < cb->args[0] || !try_module_get(ops->owner))
  			goto skip;
  
  		if (dump_rules(skb, cb, ops) < 0)
  			break;
  
  		cb->args[1] = 0;
  skip:
  		idx++;
  	}
  	rcu_read_unlock();
  	cb->args[0] = idx;
  
  	return skb->len;
  }
  
  static void notify_rule_change(int event, struct fib_rule *rule,
  			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
  			       u32 pid)
  {
  	struct net *net;
  	struct sk_buff *skb;
  	int err = -ENOBUFS;
  
  	net = ops->fro_net;
  	skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
  	if (skb == NULL)
  		goto errout;
  
  	err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
  	if (err < 0) {
  		/* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
  		WARN_ON(err == -EMSGSIZE);
  		kfree_skb(skb);
  		goto errout;
  	}
  
  	rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
  	return;
  errout:
  	if (err < 0)
  		rtnl_set_sk_err(net, ops->nlgroup, err);
  }
  
  static void attach_rules(struct list_head *rules, struct net_device *dev)
  {
  	struct fib_rule *rule;
  
  	list_for_each_entry(rule, rules, list) {
  		if (rule->iifindex == -1 &&
  		    strcmp(dev->name, rule->iifname) == 0)
  			rule->iifindex = dev->ifindex;
  		if (rule->oifindex == -1 &&
  		    strcmp(dev->name, rule->oifname) == 0)
  			rule->oifindex = dev->ifindex;
  	}
  }
  
  static void detach_rules(struct list_head *rules, struct net_device *dev)
  {
  	struct fib_rule *rule;
  
  	list_for_each_entry(rule, rules, list) {
  		if (rule->iifindex == dev->ifindex)
  			rule->iifindex = -1;
  		if (rule->oifindex == dev->ifindex)
  			rule->oifindex = -1;
  	}
  }
  
  static int fib_rules_event(struct notifier_block *this, unsigned long event,
  			    void *ptr)
  {
  	struct net_device *dev = ptr;
  	struct net *net = dev_net(dev);
  	struct fib_rules_ops *ops;
  
  	ASSERT_RTNL();
  
  	switch (event) {
  	case NETDEV_REGISTER:
  		list_for_each_entry(ops, &net->rules_ops, list)
  			attach_rules(&ops->rules_list, dev);
  		break;
  
  	case NETDEV_UNREGISTER:
  		list_for_each_entry(ops, &net->rules_ops, list)
  			detach_rules(&ops->rules_list, dev);
  		break;
  	}
  
  	return NOTIFY_DONE;
  }
  
  static struct notifier_block fib_rules_notifier = {
  	.notifier_call = fib_rules_event,
  };
  
  static int __net_init fib_rules_net_init(struct net *net)
  {
  	INIT_LIST_HEAD(&net->rules_ops);
  	spin_lock_init(&net->rules_mod_lock);
  	return 0;
  }
  
  static struct pernet_operations fib_rules_net_ops = {
  	.init = fib_rules_net_init,
  };
  
  static int __init fib_rules_init(void)
  {
  	int err;
  	rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
  	rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
  	rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
  
  	err = register_pernet_subsys(&fib_rules_net_ops);
  	if (err < 0)
  		goto fail;
  
  	err = register_netdevice_notifier(&fib_rules_notifier);
  	if (err < 0)
  		goto fail_unregister;
  
  	return 0;
  
  fail_unregister:
  	unregister_pernet_subsys(&fib_rules_net_ops);
  fail:
  	rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
  	rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
  	rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
  	return err;
  }
  
  subsys_initcall(fib_rules_init);
  