[deliverable/linux.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();

	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);
	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
2fb3573d	112	ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
e9c5158a EB	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	}
14c0b97d TG	127	EXPORT_SYMBOL_GPL(fib_rules_register);
14c0b97d TG	128
9eb87f3f	129	void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
14c0b97d TG	130	{
	131	struct fib_rule rule, tmp;
	132
76c72d4f	133	list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
14c0b97d TG	134	list_del_rcu(&rule->list);
	135	fib_rule_put(rule);
	136	}
	137	}
9eb87f3f	138	EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
14c0b97d	139
e9c5158a EB	140	static void fib_rules_put_rcu(struct rcu_head *head)
	141	{
	142	struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
	143	struct net *net = ops->fro_net;
	144
	145	release_net(net);
	146	kfree(ops);
	147	}
	148
9e3a5487	149	void fib_rules_unregister(struct fib_rules_ops *ops)
14c0b97d	150	{
9e3a5487	151	struct net *net = ops->fro_net;
14c0b97d	152
5fd30ee7	153	spin_lock(&net->rules_mod_lock);
72132c1b DL	154	list_del_rcu(&ops->list);
72132c1b DL	155	fib_rules_cleanup_ops(ops);
5fd30ee7	156	spin_unlock(&net->rules_mod_lock);
14c0b97d	157
e9c5158a	158	call_rcu(&ops->rcu, fib_rules_put_rcu);
14c0b97d	159	}
14c0b97d TG	160	EXPORT_SYMBOL_GPL(fib_rules_unregister);
14c0b97d TG	161
3dfbcc41 TG	162	static int fib_rule_match(struct fib_rule rule, struct fib_rules_ops ops,
	163	struct flowi *fl, int flags)
	164	{
	165	int ret = 0;
	166
491deb24	167	if (rule->iifindex && (rule->iifindex != fl->iif))
3dfbcc41 TG	168	goto out;
3dfbcc41 TG	169
1b038a5e PM	170	if (rule->oifindex && (rule->oifindex != fl->oif))
	171	goto out;
	172
3dfbcc41 TG	173	if ((rule->mark ^ fl->mark) & rule->mark_mask)
	174	goto out;
	175
	176	ret = ops->match(rule, fl, flags);
	177	out:
	178	return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
	179	}
	180
14c0b97d TG	181	int fib_rules_lookup(struct fib_rules_ops ops, struct flowi fl,
	182	int flags, struct fib_lookup_arg *arg)
	183	{
	184	struct fib_rule *rule;
	185	int err;
	186
	187	rcu_read_lock();
	188
76c72d4f	189	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
0947c9fe	190	jumped:
3dfbcc41	191	if (!fib_rule_match(rule, ops, fl, flags))
14c0b97d TG	192	continue;
14c0b97d TG	193
0947c9fe TG	194	if (rule->action == FR_ACT_GOTO) {
	195	struct fib_rule *target;
	196
	197	target = rcu_dereference(rule->ctarget);
	198	if (target == NULL) {
	199	continue;
	200	} else {
	201	rule = target;
	202	goto jumped;
	203	}
fa0b2d1d TG	204	} else if (rule->action == FR_ACT_NOP)
	205	continue;
	206	else
0947c9fe TG	207	err = ops->action(rule, fl, flags, arg);
0947c9fe TG	208
14c0b97d TG	209	if (err != -EAGAIN) {
	210	fib_rule_get(rule);
	211	arg->rule = rule;
	212	goto out;
	213	}
	214	}
	215
83886b6b	216	err = -ESRCH;
14c0b97d TG	217	out:
	218	rcu_read_unlock();
	219
	220	return err;
	221	}
14c0b97d TG	222	EXPORT_SYMBOL_GPL(fib_rules_lookup);
14c0b97d TG	223
e1701c68 TG	224	static int validate_rulemsg(struct fib_rule_hdr frh, struct nlattr *tb,
	225	struct fib_rules_ops *ops)
	226	{
	227	int err = -EINVAL;
	228
	229	if (frh->src_len)
	230	if (tb[FRA_SRC] == NULL \|\|
	231	frh->src_len > (ops->addr_size * 8) \|\|
	232	nla_len(tb[FRA_SRC]) != ops->addr_size)
	233	goto errout;
	234
	235	if (frh->dst_len)
	236	if (tb[FRA_DST] == NULL \|\|
	237	frh->dst_len > (ops->addr_size * 8) \|\|
	238	nla_len(tb[FRA_DST]) != ops->addr_size)
	239	goto errout;
	240
	241	err = 0;
	242	errout:
	243	return err;
	244	}
	245
9d9e6a58	246	static int fib_nl_newrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
14c0b97d	247	{
3b1e0a65	248	struct net *net = sock_net(skb->sk);
14c0b97d TG	249	struct fib_rule_hdr *frh = nlmsg_data(nlh);
	250	struct fib_rules_ops *ops = NULL;
	251	struct fib_rule rule, r, *last = NULL;
	252	struct nlattr *tb[FRA_MAX+1];
0947c9fe	253	int err = -EINVAL, unresolved = 0;
14c0b97d TG	254
	255	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
	256	goto errout;
	257
5fd30ee7	258	ops = lookup_rules_ops(net, frh->family);
14c0b97d	259	if (ops == NULL) {
2fe195cf	260	err = -EAFNOSUPPORT;
14c0b97d TG	261	goto errout;
	262	}
	263
	264	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
	265	if (err < 0)
	266	goto errout;
	267
e1701c68 TG	268	err = validate_rulemsg(frh, tb, ops);
	269	if (err < 0)
	270	goto errout;
	271
14c0b97d TG	272	rule = kzalloc(ops->rule_size, GFP_KERNEL);
	273	if (rule == NULL) {
	274	err = -ENOMEM;
	275	goto errout;
	276	}
3661a910	277	rule->fr_net = hold_net(net);
14c0b97d TG	278
	279	if (tb[FRA_PRIORITY])
	280	rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
	281
491deb24	282	if (tb[FRA_IIFNAME]) {
14c0b97d TG	283	struct net_device *dev;
14c0b97d TG	284
491deb24 PM	285	rule->iifindex = -1;
	286	nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
	287	dev = __dev_get_by_name(net, rule->iifname);
14c0b97d	288	if (dev)
491deb24	289	rule->iifindex = dev->ifindex;
14c0b97d TG	290	}
14c0b97d TG	291
1b038a5e PM	292	if (tb[FRA_OIFNAME]) {
	293	struct net_device *dev;
	294
	295	rule->oifindex = -1;
	296	nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
	297	dev = __dev_get_by_name(net, rule->oifname);
	298	if (dev)
	299	rule->oifindex = dev->ifindex;
	300	}
	301
b8964ed9 TG	302	if (tb[FRA_FWMARK]) {
	303	rule->mark = nla_get_u32(tb[FRA_FWMARK]);
	304	if (rule->mark)
	305	/* compatibility: if the mark value is non-zero all bits
	306	* are compared unless a mask is explicitly specified.
	307	*/
	308	rule->mark_mask = 0xFFFFFFFF;
	309	}
	310
	311	if (tb[FRA_FWMASK])
	312	rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
	313
14c0b97d TG	314	rule->action = frh->action;
14c0b97d TG	315	rule->flags = frh->flags;
9e762a4a	316	rule->table = frh_get_table(frh, tb);
14c0b97d	317
5adef180	318	if (!tb[FRA_PRIORITY] && ops->default_pref)
868d13ac	319	rule->pref = ops->default_pref(ops);
14c0b97d	320
0947c9fe TG	321	err = -EINVAL;
	322	if (tb[FRA_GOTO]) {
	323	if (rule->action != FR_ACT_GOTO)
	324	goto errout_free;
	325
	326	rule->target = nla_get_u32(tb[FRA_GOTO]);
	327	/* Backward jumps are prohibited to avoid endless loops */
	328	if (rule->target <= rule->pref)
	329	goto errout_free;
	330
76c72d4f	331	list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe TG	332	if (r->pref == rule->target) {
	333	rule->ctarget = r;
	334	break;
	335	}
	336	}
	337
	338	if (rule->ctarget == NULL)
	339	unresolved = 1;
	340	} else if (rule->action == FR_ACT_GOTO)
	341	goto errout_free;
	342
8b3521ee	343	err = ops->configure(rule, skb, frh, tb);
14c0b97d TG	344	if (err < 0)
	345	goto errout_free;
	346
76c72d4f	347	list_for_each_entry(r, &ops->rules_list, list) {
14c0b97d TG	348	if (r->pref > rule->pref)
	349	break;
	350	last = r;
	351	}
	352
	353	fib_rule_get(rule);
	354
0947c9fe TG	355	if (ops->unresolved_rules) {
	356	/*
	357	* There are unresolved goto rules in the list, check if
	358	* any of them are pointing to this new rule.
	359	*/
76c72d4f	360	list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe TG	361	if (r->action == FR_ACT_GOTO &&
	362	r->target == rule->pref) {
	363	BUG_ON(r->ctarget != NULL);
	364	rcu_assign_pointer(r->ctarget, rule);
	365	if (--ops->unresolved_rules == 0)
	366	break;
	367	}
	368	}
	369	}
	370
	371	if (rule->action == FR_ACT_GOTO)
	372	ops->nr_goto_rules++;
	373
	374	if (unresolved)
	375	ops->unresolved_rules++;
	376
14c0b97d TG	377	if (last)
	378	list_add_rcu(&rule->list, &last->list);
	379	else
76c72d4f	380	list_add_rcu(&rule->list, &ops->rules_list);
14c0b97d	381
9e3a5487	382	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
73417f61	383	flush_route_cache(ops);
14c0b97d TG	384	rules_ops_put(ops);
	385	return 0;
	386
	387	errout_free:
3661a910	388	release_net(rule->fr_net);
14c0b97d TG	389	kfree(rule);
	390	errout:
	391	rules_ops_put(ops);
	392	return err;
	393	}
	394
9d9e6a58	395	static int fib_nl_delrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
14c0b97d	396	{
3b1e0a65	397	struct net *net = sock_net(skb->sk);
14c0b97d TG	398	struct fib_rule_hdr *frh = nlmsg_data(nlh);
14c0b97d TG	399	struct fib_rules_ops *ops = NULL;
0947c9fe	400	struct fib_rule rule, tmp;
14c0b97d TG	401	struct nlattr *tb[FRA_MAX+1];
	402	int err = -EINVAL;
	403
	404	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
	405	goto errout;
	406
5fd30ee7	407	ops = lookup_rules_ops(net, frh->family);
14c0b97d	408	if (ops == NULL) {
2fe195cf	409	err = -EAFNOSUPPORT;
14c0b97d TG	410	goto errout;
	411	}
	412
	413	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
	414	if (err < 0)
	415	goto errout;
	416
e1701c68 TG	417	err = validate_rulemsg(frh, tb, ops);
	418	if (err < 0)
	419	goto errout;
	420
76c72d4f	421	list_for_each_entry(rule, &ops->rules_list, list) {
14c0b97d TG	422	if (frh->action && (frh->action != rule->action))
	423	continue;
	424
9e762a4a	425	if (frh->table && (frh_get_table(frh, tb) != rule->table))
14c0b97d TG	426	continue;
	427
	428	if (tb[FRA_PRIORITY] &&
	429	(rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
	430	continue;
	431
491deb24 PM	432	if (tb[FRA_IIFNAME] &&
491deb24 PM	433	nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
14c0b97d TG	434	continue;
14c0b97d TG	435
1b038a5e PM	436	if (tb[FRA_OIFNAME] &&
	437	nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
	438	continue;
	439
b8964ed9 TG	440	if (tb[FRA_FWMARK] &&
	441	(rule->mark != nla_get_u32(tb[FRA_FWMARK])))
	442	continue;
	443
	444	if (tb[FRA_FWMASK] &&
	445	(rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
	446	continue;
	447
14c0b97d TG	448	if (!ops->compare(rule, frh, tb))
	449	continue;
	450
	451	if (rule->flags & FIB_RULE_PERMANENT) {
	452	err = -EPERM;
	453	goto errout;
	454	}
	455
	456	list_del_rcu(&rule->list);
0947c9fe TG	457
	458	if (rule->action == FR_ACT_GOTO)
	459	ops->nr_goto_rules--;
	460
	461	/*
	462	* Check if this rule is a target to any of them. If so,
	463	* disable them. As this operation is eventually very
	464	* expensive, it is only performed if goto rules have
	465	* actually been added.
	466	*/
	467	if (ops->nr_goto_rules > 0) {
76c72d4f	468	list_for_each_entry(tmp, &ops->rules_list, list) {
0947c9fe TG	469	if (tmp->ctarget == rule) {
	470	rcu_assign_pointer(tmp->ctarget, NULL);
	471	ops->unresolved_rules++;
	472	}
	473	}
	474	}
	475
14c0b97d	476	synchronize_rcu();
9e3a5487	477	notify_rule_change(RTM_DELRULE, rule, ops, nlh,
c17084d2	478	NETLINK_CB(skb).pid);
14c0b97d	479	fib_rule_put(rule);
73417f61	480	flush_route_cache(ops);
14c0b97d TG	481	rules_ops_put(ops);
	482	return 0;
	483	}
	484
	485	err = -ENOENT;
	486	errout:
	487	rules_ops_put(ops);
	488	return err;
	489	}
	490
339bf98f TG	491	static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
	492	struct fib_rule *rule)
	493	{
	494	size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
491deb24	495	+ nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
1b038a5e	496	+ nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
339bf98f TG	497	+ nla_total_size(4) /* FRA_PRIORITY */
	498	+ nla_total_size(4) /* FRA_TABLE */
	499	+ nla_total_size(4) /* FRA_FWMARK */
	500	+ nla_total_size(4); /* FRA_FWMASK */
	501
	502	if (ops->nlmsg_payload)
	503	payload += ops->nlmsg_payload(rule);
	504
	505	return payload;
	506	}
	507
14c0b97d TG	508	static int fib_nl_fill_rule(struct sk_buff skb, struct fib_rule rule,
	509	u32 pid, u32 seq, int type, int flags,
	510	struct fib_rules_ops *ops)
	511	{
	512	struct nlmsghdr *nlh;
	513	struct fib_rule_hdr *frh;
	514
	515	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
	516	if (nlh == NULL)
26932566	517	return -EMSGSIZE;
14c0b97d TG	518
	519	frh = nlmsg_data(nlh);
	520	frh->table = rule->table;
9e762a4a	521	NLA_PUT_U32(skb, FRA_TABLE, rule->table);
14c0b97d TG	522	frh->res1 = 0;
	523	frh->res2 = 0;
	524	frh->action = rule->action;
	525	frh->flags = rule->flags;
	526
0947c9fe TG	527	if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL)
	528	frh->flags \|= FIB_RULE_UNRESOLVED;
	529
491deb24 PM	530	if (rule->iifname[0]) {
491deb24 PM	531	NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
14c0b97d	532
491deb24 PM	533	if (rule->iifindex == -1)
491deb24 PM	534	frh->flags \|= FIB_RULE_IIF_DETACHED;
2b443683 TG	535	}
2b443683 TG	536
1b038a5e PM	537	if (rule->oifname[0]) {
	538	NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
	539
	540	if (rule->oifindex == -1)
	541	frh->flags \|= FIB_RULE_OIF_DETACHED;
	542	}
	543
14c0b97d TG	544	if (rule->pref)
	545	NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
	546
b8964ed9 TG	547	if (rule->mark)
	548	NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
	549
	550	if (rule->mark_mask \|\| rule->mark)
	551	NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
	552
0947c9fe TG	553	if (rule->target)
	554	NLA_PUT_U32(skb, FRA_GOTO, rule->target);
	555
04af8cf6	556	if (ops->fill(rule, skb, frh) < 0)
14c0b97d TG	557	goto nla_put_failure;
	558
	559	return nlmsg_end(skb, nlh);
	560
	561	nla_put_failure:
26932566 PM	562	nlmsg_cancel(skb, nlh);
26932566 PM	563	return -EMSGSIZE;
14c0b97d TG	564	}
14c0b97d TG	565
c454673d TG	566	static int dump_rules(struct sk_buff skb, struct netlink_callback cb,
c454673d TG	567	struct fib_rules_ops *ops)
14c0b97d TG	568	{
	569	int idx = 0;
	570	struct fib_rule *rule;
14c0b97d	571
76c72d4f	572	list_for_each_entry(rule, &ops->rules_list, list) {
c454673d	573	if (idx < cb->args[1])
14c0b97d TG	574	goto skip;
	575
	576	if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
	577	cb->nlh->nlmsg_seq, RTM_NEWRULE,
	578	NLM_F_MULTI, ops) < 0)
	579	break;
	580	skip:
	581	idx++;
	582	}
c454673d	583	cb->args[1] = idx;
14c0b97d TG	584	rules_ops_put(ops);
	585
	586	return skb->len;
	587	}
	588
c454673d TG	589	static int fib_nl_dumprule(struct sk_buff skb, struct netlink_callback cb)
c454673d TG	590	{
3b1e0a65	591	struct net *net = sock_net(skb->sk);
c454673d TG	592	struct fib_rules_ops *ops;
	593	int idx = 0, family;
	594
	595	family = rtnl_msg_family(cb->nlh);
	596	if (family != AF_UNSPEC) {
	597	/* Protocol specific dump request */
5fd30ee7	598	ops = lookup_rules_ops(net, family);
c454673d TG	599	if (ops == NULL)
	600	return -EAFNOSUPPORT;
	601
	602	return dump_rules(skb, cb, ops);
	603	}
	604
	605	rcu_read_lock();
5fd30ee7	606	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
c454673d TG	607	if (idx < cb->args[0] \|\| !try_module_get(ops->owner))
	608	goto skip;
	609
	610	if (dump_rules(skb, cb, ops) < 0)
	611	break;
	612
	613	cb->args[1] = 0;
2fb3573d	614	skip:
c454673d TG	615	idx++;
	616	}
	617	rcu_read_unlock();
	618	cb->args[0] = idx;
	619
	620	return skb->len;
	621	}
14c0b97d	622
9e3a5487	623	static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2 TG	624	struct fib_rules_ops ops, struct nlmsghdr nlh,
c17084d2 TG	625	u32 pid)
14c0b97d	626	{
9e3a5487	627	struct net *net;
c17084d2 TG	628	struct sk_buff *skb;
c17084d2 TG	629	int err = -ENOBUFS;
14c0b97d	630
9e3a5487	631	net = ops->fro_net;
339bf98f	632	skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
14c0b97d	633	if (skb == NULL)
c17084d2 TG	634	goto errout;
	635
	636	err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
26932566 PM	637	if (err < 0) {
	638	/* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
	639	WARN_ON(err == -EMSGSIZE);
	640	kfree_skb(skb);
	641	goto errout;
	642	}
9e3a5487	643
1ce85fe4 PNA	644	rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1ce85fe4 PNA	645	return;
c17084d2 TG	646	errout:
c17084d2 TG	647	if (err < 0)
5fd30ee7	648	rtnl_set_sk_err(net, ops->nlgroup, err);
14c0b97d TG	649	}
	650
	651	static void attach_rules(struct list_head rules, struct net_device dev)
	652	{
	653	struct fib_rule *rule;
	654
	655	list_for_each_entry(rule, rules, list) {
491deb24 PM	656	if (rule->iifindex == -1 &&
	657	strcmp(dev->name, rule->iifname) == 0)
	658	rule->iifindex = dev->ifindex;
1b038a5e PM	659	if (rule->oifindex == -1 &&
	660	strcmp(dev->name, rule->oifname) == 0)
	661	rule->oifindex = dev->ifindex;
14c0b97d TG	662	}
	663	}
	664
	665	static void detach_rules(struct list_head rules, struct net_device dev)
	666	{
	667	struct fib_rule *rule;
	668
1b038a5e	669	list_for_each_entry(rule, rules, list) {
491deb24 PM	670	if (rule->iifindex == dev->ifindex)
491deb24 PM	671	rule->iifindex = -1;
1b038a5e PM	672	if (rule->oifindex == dev->ifindex)
	673	rule->oifindex = -1;
	674	}
14c0b97d TG	675	}
	676
	677
	678	static int fib_rules_event(struct notifier_block *this, unsigned long event,
	679	void *ptr)
	680	{
	681	struct net_device *dev = ptr;
c346dca1	682	struct net *net = dev_net(dev);
14c0b97d TG	683	struct fib_rules_ops *ops;
	684
	685	ASSERT_RTNL();
14c0b97d TG	686
	687	switch (event) {
	688	case NETDEV_REGISTER:
5fd30ee7	689	list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f	690	attach_rules(&ops->rules_list, dev);
14c0b97d TG	691	break;
	692
	693	case NETDEV_UNREGISTER:
5fd30ee7	694	list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f	695	detach_rules(&ops->rules_list, dev);
14c0b97d TG	696	break;
	697	}
	698
14c0b97d TG	699	return NOTIFY_DONE;
	700	}
	701
	702	static struct notifier_block fib_rules_notifier = {
	703	.notifier_call = fib_rules_event,
	704	};
	705
2c8c1e72	706	static int __net_init fib_rules_net_init(struct net *net)
5fd30ee7 DL	707	{
	708	INIT_LIST_HEAD(&net->rules_ops);
	709	spin_lock_init(&net->rules_mod_lock);
	710	return 0;
	711	}
	712
	713	static struct pernet_operations fib_rules_net_ops = {
	714	.init = fib_rules_net_init,
	715	};
	716
14c0b97d TG	717	static int __init fib_rules_init(void)
14c0b97d TG	718	{
5fd30ee7	719	int err;
9d9e6a58 TG	720	rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
9d9e6a58 TG	721	rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
c454673d	722	rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
9d9e6a58	723
5d6d4809	724	err = register_pernet_subsys(&fib_rules_net_ops);
5fd30ee7 DL	725	if (err < 0)
	726	goto fail;
	727
5d6d4809	728	err = register_netdevice_notifier(&fib_rules_notifier);
5fd30ee7 DL	729	if (err < 0)
5fd30ee7 DL	730	goto fail_unregister;
5d6d4809	731
5fd30ee7 DL	732	return 0;
	733
	734	fail_unregister:
5d6d4809	735	unregister_pernet_subsys(&fib_rules_net_ops);
5fd30ee7 DL	736	fail:
	737	rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
	738	rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
	739	rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
	740	return err;
14c0b97d TG	741	}
	742
	743	subsys_initcall(fib_rules_init);