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