[net-next-2.6.git] / net / core / fib_rules.c

/*
 * 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);

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(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);

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);
	}
}
EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);

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->iif))
		goto out;

	if (rule->oifindex && (rule->oifindex != fl->oif))
		goto out;

	if ((rule->mark ^ fl->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) {
			fib_rule_get(rule);
			arg->rule = rule;
			goto out;
		}
	}

	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) {
				rule->ctarget = r;
				break;
			}
		}

		if (rule->ctarget == 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 (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) {
				BUG_ON(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++;

	if (last)
		list_add_rcu(&rule->list, &last->list);
	else
		list_add_rcu(&rule->list, &ops->rules_list);

	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 (tmp->ctarget == rule) {
					rcu_assign_pointer(tmp->ctarget, NULL);
					ops->unresolved_rules++;
				}
			}
		}

		synchronize_rcu();
		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->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 && 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;

	list_for_each_entry(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++;
	}
	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();
	rcu_read_lock();

	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;
	}

	rcu_read_unlock();

	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);
	rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
	rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);

	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);
Commit	Line	Data
14c0b97d TG	1	/*
	2	* net/core/fib_rules.c Generic Routing Rules
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation, version 2.
	7	*
	8	* Authors: Thomas Graf <tgraf@suug.ch>
	9	*/
	10
14c0b97d TG	11	#include <linux/types.h>
14c0b97d TG	12	#include <linux/kernel.h>
5a0e3ad6	13	#include <linux/slab.h>
14c0b97d	14	#include <linux/list.h>
e9dc8653	15	#include <net/net_namespace.h>
881d966b	16	#include <net/sock.h>
14c0b97d TG	17	#include <net/fib_rules.h>
14c0b97d TG	18
2994c638 DL	19	int fib_default_rule_add(struct fib_rules_ops *ops,
	20	u32 pref, u32 table, u32 flags)
	21	{
	22	struct fib_rule *r;
	23
	24	r = kzalloc(ops->rule_size, GFP_KERNEL);
	25	if (r == NULL)
	26	return -ENOMEM;
	27
	28	atomic_set(&r->refcnt, 1);
	29	r->action = FR_ACT_TO_TBL;
	30	r->pref = pref;
	31	r->table = table;
	32	r->flags = flags;
3661a910	33	r->fr_net = hold_net(ops->fro_net);
2994c638 DL	34
	35	/* The lock is not required here, the list in unreacheable
	36	* at the moment this function is called */
	37	list_add_tail(&r->list, &ops->rules_list);
	38	return 0;
	39	}
	40	EXPORT_SYMBOL(fib_default_rule_add);
	41
9e3a5487	42	static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2 TG	43	struct fib_rules_ops ops, struct nlmsghdr nlh,
c17084d2 TG	44	u32 pid);
14c0b97d	45
5fd30ee7	46	static struct fib_rules_ops lookup_rules_ops(struct net net, int family)
14c0b97d TG	47	{
	48	struct fib_rules_ops *ops;
	49
	50	rcu_read_lock();
5fd30ee7	51	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
14c0b97d TG	52	if (ops->family == family) {
	53	if (!try_module_get(ops->owner))
	54	ops = NULL;
	55	rcu_read_unlock();
	56	return ops;
	57	}
	58	}
	59	rcu_read_unlock();
	60
	61	return NULL;
	62	}
	63
	64	static void rules_ops_put(struct fib_rules_ops *ops)
	65	{
	66	if (ops)
	67	module_put(ops->owner);
	68	}
	69
73417f61 TG	70	static void flush_route_cache(struct fib_rules_ops *ops)
	71	{
	72	if (ops->flush_cache)
ae299fc0	73	ops->flush_cache(ops);
73417f61 TG	74	}
73417f61 TG	75
e9c5158a	76	static int __fib_rules_register(struct fib_rules_ops *ops)
14c0b97d TG	77	{
	78	int err = -EEXIST;
	79	struct fib_rules_ops *o;
9e3a5487 DL	80	struct net *net;
	81
	82	net = ops->fro_net;
14c0b97d TG	83
	84	if (ops->rule_size < sizeof(struct fib_rule))
	85	return -EINVAL;
	86
	87	if (ops->match == NULL \|\| ops->configure == NULL \|\|
	88	ops->compare == NULL \|\| ops->fill == NULL \|\|
	89	ops->action == NULL)
	90	return -EINVAL;
	91
5fd30ee7 DL	92	spin_lock(&net->rules_mod_lock);
5fd30ee7 DL	93	list_for_each_entry(o, &net->rules_ops, list)
14c0b97d TG	94	if (ops->family == o->family)
	95	goto errout;
	96
5fd30ee7 DL	97	hold_net(net);
5fd30ee7 DL	98	list_add_tail_rcu(&ops->list, &net->rules_ops);
14c0b97d TG	99	err = 0;
14c0b97d TG	100	errout:
5fd30ee7	101	spin_unlock(&net->rules_mod_lock);
14c0b97d TG	102
	103	return err;
	104	}
	105
e9c5158a EB	106	struct fib_rules_ops *
	107	fib_rules_register(struct fib_rules_ops tmpl, struct net net)
	108	{
	109	struct fib_rules_ops *ops;
	110	int err;
	111
	112	ops = kmemdup(tmpl, sizeof (*ops), GFP_KERNEL);
	113	if (ops == NULL)
	114	return ERR_PTR(-ENOMEM);
	115
	116	INIT_LIST_HEAD(&ops->rules_list);
	117	ops->fro_net = net;
	118
	119	err = __fib_rules_register(ops);
	120	if (err) {
	121	kfree(ops);
	122	ops = ERR_PTR(err);
	123	}
	124
	125	return ops;
	126	}
	127
14c0b97d TG	128	EXPORT_SYMBOL_GPL(fib_rules_register);
14c0b97d TG	129
9eb87f3f	130	void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
14c0b97d TG	131	{
	132	struct fib_rule rule, tmp;
	133
76c72d4f	134	list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
14c0b97d TG	135	list_del_rcu(&rule->list);
	136	fib_rule_put(rule);
	137	}
	138	}
9eb87f3f	139	EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
14c0b97d	140
e9c5158a EB	141	static void fib_rules_put_rcu(struct rcu_head *head)
	142	{
	143	struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
	144	struct net *net = ops->fro_net;
	145
	146	release_net(net);
	147	kfree(ops);
	148	}
	149
9e3a5487	150	void fib_rules_unregister(struct fib_rules_ops *ops)
14c0b97d	151	{
9e3a5487	152	struct net *net = ops->fro_net;
14c0b97d	153
5fd30ee7	154	spin_lock(&net->rules_mod_lock);
72132c1b DL	155	list_del_rcu(&ops->list);
72132c1b DL	156	fib_rules_cleanup_ops(ops);
5fd30ee7	157	spin_unlock(&net->rules_mod_lock);
14c0b97d	158
e9c5158a	159	call_rcu(&ops->rcu, fib_rules_put_rcu);
14c0b97d TG	160	}
	161
	162	EXPORT_SYMBOL_GPL(fib_rules_unregister);
	163
3dfbcc41 TG	164	static int fib_rule_match(struct fib_rule rule, struct fib_rules_ops ops,
	165	struct flowi *fl, int flags)
	166	{
	167	int ret = 0;
	168
491deb24	169	if (rule->iifindex && (rule->iifindex != fl->iif))
3dfbcc41 TG	170	goto out;
3dfbcc41 TG	171
1b038a5e PM	172	if (rule->oifindex && (rule->oifindex != fl->oif))
	173	goto out;
	174
3dfbcc41 TG	175	if ((rule->mark ^ fl->mark) & rule->mark_mask)
	176	goto out;
	177
	178	ret = ops->match(rule, fl, flags);
	179	out:
	180	return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
	181	}
	182
14c0b97d TG	183	int fib_rules_lookup(struct fib_rules_ops ops, struct flowi fl,
	184	int flags, struct fib_lookup_arg *arg)
	185	{
	186	struct fib_rule *rule;
	187	int err;
	188
	189	rcu_read_lock();
	190
76c72d4f	191	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
0947c9fe	192	jumped:
3dfbcc41	193	if (!fib_rule_match(rule, ops, fl, flags))
14c0b97d TG	194	continue;
14c0b97d TG	195
0947c9fe TG	196	if (rule->action == FR_ACT_GOTO) {
	197	struct fib_rule *target;
	198
	199	target = rcu_dereference(rule->ctarget);
	200	if (target == NULL) {
	201	continue;
	202	} else {
	203	rule = target;
	204	goto jumped;
	205	}
fa0b2d1d TG	206	} else if (rule->action == FR_ACT_NOP)
	207	continue;
	208	else
0947c9fe TG	209	err = ops->action(rule, fl, flags, arg);
0947c9fe TG	210
14c0b97d TG	211	if (err != -EAGAIN) {
	212	fib_rule_get(rule);
	213	arg->rule = rule;
	214	goto out;
	215	}
	216	}
	217
83886b6b	218	err = -ESRCH;
14c0b97d TG	219	out:
	220	rcu_read_unlock();
	221
	222	return err;
	223	}
	224
	225	EXPORT_SYMBOL_GPL(fib_rules_lookup);
	226
e1701c68 TG	227	static int validate_rulemsg(struct fib_rule_hdr frh, struct nlattr *tb,
	228	struct fib_rules_ops *ops)
	229	{
	230	int err = -EINVAL;
	231
	232	if (frh->src_len)
	233	if (tb[FRA_SRC] == NULL \|\|
	234	frh->src_len > (ops->addr_size * 8) \|\|
	235	nla_len(tb[FRA_SRC]) != ops->addr_size)
	236	goto errout;
	237
	238	if (frh->dst_len)
	239	if (tb[FRA_DST] == NULL \|\|
	240	frh->dst_len > (ops->addr_size * 8) \|\|
	241	nla_len(tb[FRA_DST]) != ops->addr_size)
	242	goto errout;
	243
	244	err = 0;
	245	errout:
	246	return err;
	247	}
	248
9d9e6a58	249	static int fib_nl_newrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
14c0b97d	250	{
3b1e0a65	251	struct net *net = sock_net(skb->sk);
14c0b97d TG	252	struct fib_rule_hdr *frh = nlmsg_data(nlh);
	253	struct fib_rules_ops *ops = NULL;
	254	struct fib_rule rule, r, *last = NULL;
	255	struct nlattr *tb[FRA_MAX+1];
0947c9fe	256	int err = -EINVAL, unresolved = 0;
14c0b97d TG	257
	258	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
	259	goto errout;
	260
5fd30ee7	261	ops = lookup_rules_ops(net, frh->family);
14c0b97d	262	if (ops == NULL) {
2fe195cf	263	err = -EAFNOSUPPORT;
14c0b97d TG	264	goto errout;
	265	}
	266
	267	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
	268	if (err < 0)
	269	goto errout;
	270
e1701c68 TG	271	err = validate_rulemsg(frh, tb, ops);
	272	if (err < 0)
	273	goto errout;
	274
14c0b97d TG	275	rule = kzalloc(ops->rule_size, GFP_KERNEL);
	276	if (rule == NULL) {
	277	err = -ENOMEM;
	278	goto errout;
	279	}
3661a910	280	rule->fr_net = hold_net(net);
14c0b97d TG	281
	282	if (tb[FRA_PRIORITY])
	283	rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
	284
491deb24	285	if (tb[FRA_IIFNAME]) {
14c0b97d TG	286	struct net_device *dev;
14c0b97d TG	287
491deb24 PM	288	rule->iifindex = -1;
	289	nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
	290	dev = __dev_get_by_name(net, rule->iifname);
14c0b97d	291	if (dev)
491deb24	292	rule->iifindex = dev->ifindex;
14c0b97d TG	293	}
14c0b97d TG	294
1b038a5e PM	295	if (tb[FRA_OIFNAME]) {
	296	struct net_device *dev;
	297
	298	rule->oifindex = -1;
	299	nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
	300	dev = __dev_get_by_name(net, rule->oifname);
	301	if (dev)
	302	rule->oifindex = dev->ifindex;
	303	}
	304
b8964ed9 TG	305	if (tb[FRA_FWMARK]) {
	306	rule->mark = nla_get_u32(tb[FRA_FWMARK]);
	307	if (rule->mark)
	308	/* compatibility: if the mark value is non-zero all bits
	309	* are compared unless a mask is explicitly specified.
	310	*/
	311	rule->mark_mask = 0xFFFFFFFF;
	312	}
	313
	314	if (tb[FRA_FWMASK])
	315	rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
	316
14c0b97d TG	317	rule->action = frh->action;
14c0b97d TG	318	rule->flags = frh->flags;
9e762a4a	319	rule->table = frh_get_table(frh, tb);
14c0b97d	320
5adef180	321	if (!tb[FRA_PRIORITY] && ops->default_pref)
868d13ac	322	rule->pref = ops->default_pref(ops);
14c0b97d	323
0947c9fe TG	324	err = -EINVAL;
	325	if (tb[FRA_GOTO]) {
	326	if (rule->action != FR_ACT_GOTO)
	327	goto errout_free;
	328
	329	rule->target = nla_get_u32(tb[FRA_GOTO]);
	330	/* Backward jumps are prohibited to avoid endless loops */
	331	if (rule->target <= rule->pref)
	332	goto errout_free;
	333
76c72d4f	334	list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe TG	335	if (r->pref == rule->target) {
	336	rule->ctarget = r;
	337	break;
	338	}
	339	}
	340
	341	if (rule->ctarget == NULL)
	342	unresolved = 1;
	343	} else if (rule->action == FR_ACT_GOTO)
	344	goto errout_free;
	345
8b3521ee	346	err = ops->configure(rule, skb, frh, tb);
14c0b97d TG	347	if (err < 0)
	348	goto errout_free;
	349
76c72d4f	350	list_for_each_entry(r, &ops->rules_list, list) {
14c0b97d TG	351	if (r->pref > rule->pref)
	352	break;
	353	last = r;
	354	}
	355
	356	fib_rule_get(rule);
	357
0947c9fe TG	358	if (ops->unresolved_rules) {
	359	/*
	360	* There are unresolved goto rules in the list, check if
	361	* any of them are pointing to this new rule.
	362	*/
76c72d4f	363	list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe TG	364	if (r->action == FR_ACT_GOTO &&
	365	r->target == rule->pref) {
	366	BUG_ON(r->ctarget != NULL);
	367	rcu_assign_pointer(r->ctarget, rule);
	368	if (--ops->unresolved_rules == 0)
	369	break;
	370	}
	371	}
	372	}
	373
	374	if (rule->action == FR_ACT_GOTO)
	375	ops->nr_goto_rules++;
	376
	377	if (unresolved)
	378	ops->unresolved_rules++;
	379
14c0b97d TG	380	if (last)
	381	list_add_rcu(&rule->list, &last->list);
	382	else
76c72d4f	383	list_add_rcu(&rule->list, &ops->rules_list);
14c0b97d	384
9e3a5487	385	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
73417f61	386	flush_route_cache(ops);
14c0b97d TG	387	rules_ops_put(ops);
	388	return 0;
	389
	390	errout_free:
3661a910	391	release_net(rule->fr_net);
14c0b97d TG	392	kfree(rule);
	393	errout:
	394	rules_ops_put(ops);
	395	return err;
	396	}
	397
9d9e6a58	398	static int fib_nl_delrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
14c0b97d	399	{
3b1e0a65	400	struct net *net = sock_net(skb->sk);
14c0b97d TG	401	struct fib_rule_hdr *frh = nlmsg_data(nlh);
14c0b97d TG	402	struct fib_rules_ops *ops = NULL;
0947c9fe	403	struct fib_rule rule, tmp;
14c0b97d TG	404	struct nlattr *tb[FRA_MAX+1];
	405	int err = -EINVAL;
	406
	407	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
	408	goto errout;
	409
5fd30ee7	410	ops = lookup_rules_ops(net, frh->family);
14c0b97d	411	if (ops == NULL) {
2fe195cf	412	err = -EAFNOSUPPORT;
14c0b97d TG	413	goto errout;
	414	}
	415
	416	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
	417	if (err < 0)
	418	goto errout;
	419
e1701c68 TG	420	err = validate_rulemsg(frh, tb, ops);
	421	if (err < 0)
	422	goto errout;
	423
76c72d4f	424	list_for_each_entry(rule, &ops->rules_list, list) {
14c0b97d TG	425	if (frh->action && (frh->action != rule->action))
	426	continue;
	427
9e762a4a	428	if (frh->table && (frh_get_table(frh, tb) != rule->table))
14c0b97d TG	429	continue;
	430
	431	if (tb[FRA_PRIORITY] &&
	432	(rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
	433	continue;
	434
491deb24 PM	435	if (tb[FRA_IIFNAME] &&
491deb24 PM	436	nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
14c0b97d TG	437	continue;
14c0b97d TG	438
1b038a5e PM	439	if (tb[FRA_OIFNAME] &&
	440	nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
	441	continue;
	442
b8964ed9 TG	443	if (tb[FRA_FWMARK] &&
	444	(rule->mark != nla_get_u32(tb[FRA_FWMARK])))
	445	continue;
	446
	447	if (tb[FRA_FWMASK] &&
	448	(rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
	449	continue;
	450
14c0b97d TG	451	if (!ops->compare(rule, frh, tb))
	452	continue;
	453
	454	if (rule->flags & FIB_RULE_PERMANENT) {
	455	err = -EPERM;
	456	goto errout;
	457	}
	458
	459	list_del_rcu(&rule->list);
0947c9fe TG	460
	461	if (rule->action == FR_ACT_GOTO)
	462	ops->nr_goto_rules--;
	463
	464	/*
	465	* Check if this rule is a target to any of them. If so,
	466	* disable them. As this operation is eventually very
	467	* expensive, it is only performed if goto rules have
	468	* actually been added.
	469	*/
	470	if (ops->nr_goto_rules > 0) {
76c72d4f	471	list_for_each_entry(tmp, &ops->rules_list, list) {
0947c9fe TG	472	if (tmp->ctarget == rule) {
	473	rcu_assign_pointer(tmp->ctarget, NULL);
	474	ops->unresolved_rules++;
	475	}
	476	}
	477	}
	478
14c0b97d	479	synchronize_rcu();
9e3a5487	480	notify_rule_change(RTM_DELRULE, rule, ops, nlh,
c17084d2	481	NETLINK_CB(skb).pid);
14c0b97d	482	fib_rule_put(rule);
73417f61	483	flush_route_cache(ops);
14c0b97d TG	484	rules_ops_put(ops);
	485	return 0;
	486	}
	487
	488	err = -ENOENT;
	489	errout:
	490	rules_ops_put(ops);
	491	return err;
	492	}
	493
339bf98f TG	494	static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
	495	struct fib_rule *rule)
	496	{
	497	size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
491deb24	498	+ nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
1b038a5e	499	+ nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
339bf98f TG	500	+ nla_total_size(4) /* FRA_PRIORITY */
	501	+ nla_total_size(4) /* FRA_TABLE */
	502	+ nla_total_size(4) /* FRA_FWMARK */
	503	+ nla_total_size(4); /* FRA_FWMASK */
	504
	505	if (ops->nlmsg_payload)
	506	payload += ops->nlmsg_payload(rule);
	507
	508	return payload;
	509	}
	510
14c0b97d TG	511	static int fib_nl_fill_rule(struct sk_buff skb, struct fib_rule rule,
	512	u32 pid, u32 seq, int type, int flags,
	513	struct fib_rules_ops *ops)
	514	{
	515	struct nlmsghdr *nlh;
	516	struct fib_rule_hdr *frh;
	517
	518	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
	519	if (nlh == NULL)
26932566	520	return -EMSGSIZE;
14c0b97d TG	521
	522	frh = nlmsg_data(nlh);
	523	frh->table = rule->table;
9e762a4a	524	NLA_PUT_U32(skb, FRA_TABLE, rule->table);
14c0b97d TG	525	frh->res1 = 0;
	526	frh->res2 = 0;
	527	frh->action = rule->action;
	528	frh->flags = rule->flags;
	529
0947c9fe TG	530	if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL)
	531	frh->flags \|= FIB_RULE_UNRESOLVED;
	532
491deb24 PM	533	if (rule->iifname[0]) {
491deb24 PM	534	NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
14c0b97d	535
491deb24 PM	536	if (rule->iifindex == -1)
491deb24 PM	537	frh->flags \|= FIB_RULE_IIF_DETACHED;
2b443683 TG	538	}
2b443683 TG	539
1b038a5e PM	540	if (rule->oifname[0]) {
	541	NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
	542
	543	if (rule->oifindex == -1)
	544	frh->flags \|= FIB_RULE_OIF_DETACHED;
	545	}
	546
14c0b97d TG	547	if (rule->pref)
	548	NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
	549
b8964ed9 TG	550	if (rule->mark)
	551	NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
	552
	553	if (rule->mark_mask \|\| rule->mark)
	554	NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
	555
0947c9fe TG	556	if (rule->target)
	557	NLA_PUT_U32(skb, FRA_GOTO, rule->target);
	558
04af8cf6	559	if (ops->fill(rule, skb, frh) < 0)
14c0b97d TG	560	goto nla_put_failure;
	561
	562	return nlmsg_end(skb, nlh);
	563
	564	nla_put_failure:
26932566 PM	565	nlmsg_cancel(skb, nlh);
26932566 PM	566	return -EMSGSIZE;
14c0b97d TG	567	}
14c0b97d TG	568
c454673d TG	569	static int dump_rules(struct sk_buff skb, struct netlink_callback cb,
c454673d TG	570	struct fib_rules_ops *ops)
14c0b97d TG	571	{
	572	int idx = 0;
	573	struct fib_rule *rule;
14c0b97d	574
76c72d4f	575	list_for_each_entry(rule, &ops->rules_list, list) {
c454673d	576	if (idx < cb->args[1])
14c0b97d TG	577	goto skip;
	578
	579	if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
	580	cb->nlh->nlmsg_seq, RTM_NEWRULE,
	581	NLM_F_MULTI, ops) < 0)
	582	break;
	583	skip:
	584	idx++;
	585	}
c454673d	586	cb->args[1] = idx;
14c0b97d TG	587	rules_ops_put(ops);
	588
	589	return skb->len;
	590	}
	591
c454673d TG	592	static int fib_nl_dumprule(struct sk_buff skb, struct netlink_callback cb)
c454673d TG	593	{
3b1e0a65	594	struct net *net = sock_net(skb->sk);
c454673d TG	595	struct fib_rules_ops *ops;
	596	int idx = 0, family;
	597
	598	family = rtnl_msg_family(cb->nlh);
	599	if (family != AF_UNSPEC) {
	600	/* Protocol specific dump request */
5fd30ee7	601	ops = lookup_rules_ops(net, family);
c454673d TG	602	if (ops == NULL)
	603	return -EAFNOSUPPORT;
	604
	605	return dump_rules(skb, cb, ops);
	606	}
	607
	608	rcu_read_lock();
5fd30ee7	609	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
c454673d TG	610	if (idx < cb->args[0] \|\| !try_module_get(ops->owner))
	611	goto skip;
	612
	613	if (dump_rules(skb, cb, ops) < 0)
	614	break;
	615
	616	cb->args[1] = 0;
	617	skip:
	618	idx++;
	619	}
	620	rcu_read_unlock();
	621	cb->args[0] = idx;
	622
	623	return skb->len;
	624	}
14c0b97d	625
9e3a5487	626	static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2 TG	627	struct fib_rules_ops ops, struct nlmsghdr nlh,
c17084d2 TG	628	u32 pid)
14c0b97d	629	{
9e3a5487	630	struct net *net;
c17084d2 TG	631	struct sk_buff *skb;
c17084d2 TG	632	int err = -ENOBUFS;
14c0b97d	633
9e3a5487	634	net = ops->fro_net;
339bf98f	635	skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
14c0b97d	636	if (skb == NULL)
c17084d2 TG	637	goto errout;
	638
	639	err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
26932566 PM	640	if (err < 0) {
	641	/* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
	642	WARN_ON(err == -EMSGSIZE);
	643	kfree_skb(skb);
	644	goto errout;
	645	}
9e3a5487	646
1ce85fe4 PNA	647	rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1ce85fe4 PNA	648	return;
c17084d2 TG	649	errout:
c17084d2 TG	650	if (err < 0)
5fd30ee7	651	rtnl_set_sk_err(net, ops->nlgroup, err);
14c0b97d TG	652	}
	653
	654	static void attach_rules(struct list_head rules, struct net_device dev)
	655	{
	656	struct fib_rule *rule;
	657
	658	list_for_each_entry(rule, rules, list) {
491deb24 PM	659	if (rule->iifindex == -1 &&
	660	strcmp(dev->name, rule->iifname) == 0)
	661	rule->iifindex = dev->ifindex;
1b038a5e PM	662	if (rule->oifindex == -1 &&
	663	strcmp(dev->name, rule->oifname) == 0)
	664	rule->oifindex = dev->ifindex;
14c0b97d TG	665	}
	666	}
	667
	668	static void detach_rules(struct list_head rules, struct net_device dev)
	669	{
	670	struct fib_rule *rule;
	671
1b038a5e	672	list_for_each_entry(rule, rules, list) {
491deb24 PM	673	if (rule->iifindex == dev->ifindex)
491deb24 PM	674	rule->iifindex = -1;
1b038a5e PM	675	if (rule->oifindex == dev->ifindex)
	676	rule->oifindex = -1;
	677	}
14c0b97d TG	678	}
	679
	680
	681	static int fib_rules_event(struct notifier_block *this, unsigned long event,
	682	void *ptr)
	683	{
	684	struct net_device *dev = ptr;
c346dca1	685	struct net *net = dev_net(dev);
14c0b97d TG	686	struct fib_rules_ops *ops;
	687
	688	ASSERT_RTNL();
	689	rcu_read_lock();
	690
	691	switch (event) {
	692	case NETDEV_REGISTER:
5fd30ee7	693	list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f	694	attach_rules(&ops->rules_list, dev);
14c0b97d TG	695	break;
	696
	697	case NETDEV_UNREGISTER:
5fd30ee7	698	list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f	699	detach_rules(&ops->rules_list, dev);
14c0b97d TG	700	break;
	701	}
	702
	703	rcu_read_unlock();
	704
	705	return NOTIFY_DONE;
	706	}
	707
	708	static struct notifier_block fib_rules_notifier = {
	709	.notifier_call = fib_rules_event,
	710	};
	711
2c8c1e72	712	static int __net_init fib_rules_net_init(struct net *net)
5fd30ee7 DL	713	{
	714	INIT_LIST_HEAD(&net->rules_ops);
	715	spin_lock_init(&net->rules_mod_lock);
	716	return 0;
	717	}
	718
	719	static struct pernet_operations fib_rules_net_ops = {
	720	.init = fib_rules_net_init,
	721	};
	722
14c0b97d TG	723	static int __init fib_rules_init(void)
14c0b97d TG	724	{
5fd30ee7	725	int err;
9d9e6a58 TG	726	rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
9d9e6a58 TG	727	rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
c454673d	728	rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
9d9e6a58	729
5d6d4809	730	err = register_pernet_subsys(&fib_rules_net_ops);
5fd30ee7 DL	731	if (err < 0)
	732	goto fail;
	733
5d6d4809	734	err = register_netdevice_notifier(&fib_rules_notifier);
5fd30ee7 DL	735	if (err < 0)
5fd30ee7 DL	736	goto fail_unregister;
5d6d4809	737
5fd30ee7 DL	738	return 0;
	739
	740	fail_unregister:
5d6d4809	741	unregister_pernet_subsys(&fib_rules_net_ops);
5fd30ee7 DL	742	fail:
	743	rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
	744	rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
	745	rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
	746	return err;
14c0b97d TG	747	}
	748
	749	subsys_initcall(fib_rules_init);