[linux-2.6-block.git] / net / decnet / dn_rules.c


/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Routing Forwarding Information Base (Rules)
 *
 * Author:      Steve Whitehouse <SteveW@ACM.org>
 *              Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
 *
 *
 * Changes:
 *
 */
#include <linux/config.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/in_route.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/dn.h>
#include <net/dn_fib.h>
#include <net/dn_neigh.h>
#include <net/dn_dev.h>

struct dn_fib_rule
{
	struct hlist_node	r_hlist;
	atomic_t		r_clntref;
	u32			r_preference;
	unsigned char		r_table;
	unsigned char		r_action;
	unsigned char		r_dst_len;
	unsigned char		r_src_len;
	__le16			r_src;
	__le16			r_srcmask;
	__le16			r_dst;
	__le16			r_dstmask;
	__le16			r_srcmap;
	u8			r_flags;
#ifdef CONFIG_DECNET_ROUTE_FWMARK
	u32			r_fwmark;
#endif
	int			r_ifindex;
	char			r_ifname[IFNAMSIZ];
	int			r_dead;
	struct rcu_head		rcu;
};

static struct dn_fib_rule default_rule = {
	.r_clntref =		ATOMIC_INIT(2),
	.r_preference =		0x7fff,
	.r_table =		RT_TABLE_MAIN,
	.r_action =		RTN_UNICAST
};

static struct hlist_head dn_fib_rules;

int dn_fib_rtm_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
	struct rtattr **rta = arg;
	struct rtmsg *rtm = NLMSG_DATA(nlh);
	struct dn_fib_rule *r;
	struct hlist_node *node;
	int err = -ESRCH;

	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
		if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
			rtm->rtm_src_len == r->r_src_len &&
			rtm->rtm_dst_len == r->r_dst_len &&
			(!rta[RTA_DST-1] || memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
#ifdef CONFIG_DECNET_ROUTE_FWMARK
			(!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
#endif
			(!rtm->rtm_type || rtm->rtm_type == r->r_action) &&
			(!rta[RTA_PRIORITY-1] || memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
			(!rta[RTA_IIF-1] || rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
			(!rtm->rtm_table || (r && rtm->rtm_table == r->r_table))) {

			err = -EPERM;
			if (r == &default_rule)
				break;

			hlist_del_rcu(&r->r_hlist);
			r->r_dead = 1;
			dn_fib_rule_put(r);
			err = 0;
			break;
		}
	}

	return err;
}

static inline void dn_fib_rule_put_rcu(struct rcu_head *head)
{
	struct dn_fib_rule *r = container_of(head, struct dn_fib_rule, rcu);
	kfree(r);
}

void dn_fib_rule_put(struct dn_fib_rule *r)
{
	if (atomic_dec_and_test(&r->r_clntref)) {
		if (r->r_dead)
			call_rcu(&r->rcu, dn_fib_rule_put_rcu);
		else
			printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
	}
}


int dn_fib_rtm_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
	struct rtattr **rta = arg;
	struct rtmsg *rtm = NLMSG_DATA(nlh);
	struct dn_fib_rule *r, *new_r, *last = NULL;
	struct hlist_node *node = NULL;
	unsigned char table_id;

	if (rtm->rtm_src_len > 16 || rtm->rtm_dst_len > 16)
		return -EINVAL;

	if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
		return -EINVAL;

	if (rtm->rtm_type == RTN_NAT)
		return -EINVAL;

	table_id = rtm->rtm_table;
	if (table_id == RT_TABLE_UNSPEC) {
		struct dn_fib_table *tb;
		if (rtm->rtm_type == RTN_UNICAST) {
			if ((tb = dn_fib_empty_table()) == NULL)
				return -ENOBUFS;
			table_id = tb->n;
		}
	}

	new_r = kmalloc(sizeof(*new_r), GFP_KERNEL);
	if (!new_r)
		return -ENOMEM;
	memset(new_r, 0, sizeof(*new_r));

	if (rta[RTA_SRC-1])
		memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
	if (rta[RTA_DST-1])
		memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
	if (rta[RTA_GATEWAY-1])
		memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
	new_r->r_src_len = rtm->rtm_src_len;
	new_r->r_dst_len = rtm->rtm_dst_len;
	new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
	new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
#ifdef CONFIG_DECNET_ROUTE_FWMARK
	if (rta[RTA_PROTOINFO-1])
		memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
#endif
	new_r->r_action = rtm->rtm_type;
	new_r->r_flags = rtm->rtm_flags;
	if (rta[RTA_PRIORITY-1])
		memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
	new_r->r_table = table_id;
	if (rta[RTA_IIF-1]) {
		struct net_device *dev;
		rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
		new_r->r_ifindex = -1;
		dev = dev_get_by_name(new_r->r_ifname);
		if (dev) {
			new_r->r_ifindex = dev->ifindex;
			dev_put(dev);
		}
	}

	r = container_of(dn_fib_rules.first, struct dn_fib_rule, r_hlist);
	if (!new_r->r_preference) {
		if (r && r->r_hlist.next != NULL) {
			r = container_of(r->r_hlist.next, struct dn_fib_rule, r_hlist);
			if (r->r_preference)
				new_r->r_preference = r->r_preference - 1;
		}
	}

	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
		if (r->r_preference > new_r->r_preference)
			break;
		last = r;
	}
	atomic_inc(&new_r->r_clntref);

	if (last)
		hlist_add_after_rcu(&last->r_hlist, &new_r->r_hlist);
	else
		hlist_add_before_rcu(&new_r->r_hlist, &r->r_hlist);
	return 0;
}


int dn_fib_lookup(const struct flowi *flp, struct dn_fib_res *res)
{
	struct dn_fib_rule *r, *policy;
	struct dn_fib_table *tb;
	__le16 saddr = flp->fld_src;
	__le16 daddr = flp->fld_dst;
	struct hlist_node *node;
	int err;

	rcu_read_lock();

	hlist_for_each_entry_rcu(r, node, &dn_fib_rules, r_hlist) {
		if (((saddr^r->r_src) & r->r_srcmask) ||
		    ((daddr^r->r_dst) & r->r_dstmask) ||
#ifdef CONFIG_DECNET_ROUTE_FWMARK
		    (r->r_fwmark && r->r_fwmark != flp->fld_fwmark) ||
#endif
		    (r->r_ifindex && r->r_ifindex != flp->iif))
			continue;

		switch(r->r_action) {
			case RTN_UNICAST:
			case RTN_NAT:
				policy = r;
				break;
			case RTN_UNREACHABLE:
				rcu_read_unlock();
				return -ENETUNREACH;
			default:
			case RTN_BLACKHOLE:
				rcu_read_unlock();
				return -EINVAL;
			case RTN_PROHIBIT:
				rcu_read_unlock();
				return -EACCES;
		}

		if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
			continue;
		err = tb->lookup(tb, flp, res);
		if (err == 0) {
			res->r = policy;
			if (policy)
				atomic_inc(&policy->r_clntref);
			rcu_read_unlock();
			return 0;
		}
		if (err < 0 && err != -EAGAIN) {
			rcu_read_unlock();
			return err;
		}
	}

	rcu_read_unlock();
	return -ESRCH;
}

unsigned dnet_addr_type(__le16 addr)
{
	struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
	struct dn_fib_res res;
	unsigned ret = RTN_UNICAST;
	struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];

	res.r = NULL;

	if (tb) {
		if (!tb->lookup(tb, &fl, &res)) {
			ret = res.type;
			dn_fib_res_put(&res);
		}
	}
	return ret;
}

__le16 dn_fib_rules_policy(__le16 saddr, struct dn_fib_res *res, unsigned *flags)
{
	struct dn_fib_rule *r = res->r;

	if (r->r_action == RTN_NAT) {
		int addrtype = dnet_addr_type(r->r_srcmap);

		if (addrtype == RTN_NAT) {
			saddr = (saddr&~r->r_srcmask)|r->r_srcmap;
			*flags |= RTCF_SNAT;
		} else if (addrtype == RTN_LOCAL || r->r_srcmap == 0) {
			saddr = r->r_srcmap;
			*flags |= RTCF_MASQ;
		}
	}
	return saddr;
}

static void dn_fib_rules_detach(struct net_device *dev)
{
	struct hlist_node *node;
	struct dn_fib_rule *r;

	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
		if (r->r_ifindex == dev->ifindex)
			r->r_ifindex = -1;
	}
}

static void dn_fib_rules_attach(struct net_device *dev)
{
	struct hlist_node *node;
	struct dn_fib_rule *r;

	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
		if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0)
			r->r_ifindex = dev->ifindex;
	}
}

static int dn_fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;

	switch(event) {
		case NETDEV_UNREGISTER:
			dn_fib_rules_detach(dev);
			dn_fib_sync_down(0, dev, 1);
		case NETDEV_REGISTER:
			dn_fib_rules_attach(dev);
			dn_fib_sync_up(dev);
	}

	return NOTIFY_DONE;
}


static struct notifier_block dn_fib_rules_notifier = {
	.notifier_call =	dn_fib_rules_event,
};

static int dn_fib_fill_rule(struct sk_buff *skb, struct dn_fib_rule *r,
			    struct netlink_callback *cb, unsigned int flags)
{
	struct rtmsg *rtm;
	struct nlmsghdr *nlh;
	unsigned char *b = skb->tail;


	nlh = NLMSG_NEW_ANSWER(skb, cb, RTM_NEWRULE, sizeof(*rtm), flags);
	rtm = NLMSG_DATA(nlh);
	rtm->rtm_family = AF_DECnet;
	rtm->rtm_dst_len = r->r_dst_len;
	rtm->rtm_src_len = r->r_src_len;
	rtm->rtm_tos = 0;
#ifdef CONFIG_DECNET_ROUTE_FWMARK
	if (r->r_fwmark)
		RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
#endif
	rtm->rtm_table = r->r_table;
	rtm->rtm_protocol = 0;
	rtm->rtm_scope = 0;
	rtm->rtm_type = r->r_action;
	rtm->rtm_flags = r->r_flags;

	if (r->r_dst_len)
		RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
	if (r->r_src_len)
		RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
	if (r->r_ifname[0])
		RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
	if (r->r_preference)
		RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
	if (r->r_srcmap)
		RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

nlmsg_failure:
rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
{
	int idx = 0;
	int s_idx = cb->args[0];
	struct dn_fib_rule *r;
	struct hlist_node *node;

	rcu_read_lock();
	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
		if (idx < s_idx)
			continue;
		if (dn_fib_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
			break;
		idx++;
	}
	rcu_read_unlock();
	cb->args[0] = idx;

	return skb->len;
}

void __init dn_fib_rules_init(void)
{
	INIT_HLIST_HEAD(&dn_fib_rules);
	hlist_add_head(&default_rule.r_hlist, &dn_fib_rules);
	register_netdevice_notifier(&dn_fib_rules_notifier);
}

void __exit dn_fib_rules_cleanup(void)
{
	unregister_netdevice_notifier(&dn_fib_rules_notifier);
}
Commit	Line	Data
1da177e4 LT	1
	2	/*
	3	* DECnet An implementation of the DECnet protocol suite for the LINUX
	4	* operating system. DECnet is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* DECnet Routing Forwarding Information Base (Rules)
	8	*
	9	* Author: Steve Whitehouse <SteveW@ACM.org>
	10	* Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
	11	*
	12	*
	13	* Changes:
	14	*
	15	*/
	16	#include <linux/config.h>
	17	#include <linux/string.h>
	18	#include <linux/net.h>
	19	#include <linux/socket.h>
	20	#include <linux/sockios.h>
	21	#include <linux/init.h>
	22	#include <linux/skbuff.h>
	23	#include <linux/netlink.h>
	24	#include <linux/rtnetlink.h>
	25	#include <linux/proc_fs.h>
	26	#include <linux/netdevice.h>
	27	#include <linux/timer.h>
	28	#include <linux/spinlock.h>
	29	#include <linux/in_route.h>
ecba320f SW	30	#include <linux/list.h>
ecba320f SW	31	#include <linux/rcupdate.h>
1da177e4 LT	32	#include <asm/atomic.h>
	33	#include <asm/uaccess.h>
	34	#include <net/neighbour.h>
	35	#include <net/dst.h>
	36	#include <net/flow.h>
	37	#include <net/dn.h>
	38	#include <net/dn_fib.h>
	39	#include <net/dn_neigh.h>
	40	#include <net/dn_dev.h>
	41
	42	struct dn_fib_rule
	43	{
ecba320f	44	struct hlist_node r_hlist;
1da177e4 LT	45	atomic_t r_clntref;
	46	u32 r_preference;
	47	unsigned char r_table;
	48	unsigned char r_action;
	49	unsigned char r_dst_len;
	50	unsigned char r_src_len;
c4ea94ab SW	51	__le16 r_src;
	52	__le16 r_srcmask;
	53	__le16 r_dst;
	54	__le16 r_dstmask;
	55	__le16 r_srcmap;
1da177e4 LT	56	u8 r_flags;
	57	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	58	u32 r_fwmark;
	59	#endif
	60	int r_ifindex;
	61	char r_ifname[IFNAMSIZ];
	62	int r_dead;
ecba320f	63	struct rcu_head rcu;
1da177e4 LT	64	};
	65
	66	static struct dn_fib_rule default_rule = {
	67	.r_clntref = ATOMIC_INIT(2),
	68	.r_preference = 0x7fff,
	69	.r_table = RT_TABLE_MAIN,
	70	.r_action = RTN_UNICAST
	71	};
	72
ecba320f	73	static struct hlist_head dn_fib_rules;
1da177e4 LT	74
	75	int dn_fib_rtm_delrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
	76	{
	77	struct rtattr **rta = arg;
	78	struct rtmsg *rtm = NLMSG_DATA(nlh);
ecba320f SW	79	struct dn_fib_rule *r;
ecba320f SW	80	struct hlist_node *node;
1da177e4 LT	81	int err = -ESRCH;
1da177e4 LT	82
ecba320f	83	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	84	if ((!rta[RTA_SRC-1] \|\| memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
	85	rtm->rtm_src_len == r->r_src_len &&
	86	rtm->rtm_dst_len == r->r_dst_len &&
	87	(!rta[RTA_DST-1] \|\| memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
	88	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	89	(!rta[RTA_PROTOINFO-1] \|\| memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
	90	#endif
	91	(!rtm->rtm_type \|\| rtm->rtm_type == r->r_action) &&
	92	(!rta[RTA_PRIORITY-1] \|\| memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
	93	(!rta[RTA_IIF-1] \|\| rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
	94	(!rtm->rtm_table \|\| (r && rtm->rtm_table == r->r_table))) {
	95
	96	err = -EPERM;
	97	if (r == &default_rule)
	98	break;
	99
ecba320f	100	hlist_del_rcu(&r->r_hlist);
1da177e4	101	r->r_dead = 1;
1da177e4 LT	102	dn_fib_rule_put(r);
	103	err = 0;
	104	break;
	105	}
	106	}
	107
	108	return err;
	109	}
	110
ecba320f SW	111	static inline void dn_fib_rule_put_rcu(struct rcu_head *head)
	112	{
	113	struct dn_fib_rule *r = container_of(head, struct dn_fib_rule, rcu);
	114	kfree(r);
	115	}
	116
1da177e4 LT	117	void dn_fib_rule_put(struct dn_fib_rule *r)
	118	{
	119	if (atomic_dec_and_test(&r->r_clntref)) {
	120	if (r->r_dead)
ecba320f	121	call_rcu(&r->rcu, dn_fib_rule_put_rcu);
1da177e4 LT	122	else
	123	printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
	124	}
	125	}
	126
	127
	128	int dn_fib_rtm_newrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
	129	{
	130	struct rtattr **rta = arg;
	131	struct rtmsg *rtm = NLMSG_DATA(nlh);
ecba320f SW	132	struct dn_fib_rule r, new_r, *last = NULL;
ecba320f SW	133	struct hlist_node *node = NULL;
1da177e4 LT	134	unsigned char table_id;
	135
	136	if (rtm->rtm_src_len > 16 \|\| rtm->rtm_dst_len > 16)
	137	return -EINVAL;
	138
	139	if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
	140	return -EINVAL;
	141
	142	if (rtm->rtm_type == RTN_NAT)
	143	return -EINVAL;
	144
	145	table_id = rtm->rtm_table;
	146	if (table_id == RT_TABLE_UNSPEC) {
	147	struct dn_fib_table *tb;
	148	if (rtm->rtm_type == RTN_UNICAST) {
	149	if ((tb = dn_fib_empty_table()) == NULL)
	150	return -ENOBUFS;
	151	table_id = tb->n;
	152	}
	153	}
	154
	155	new_r = kmalloc(sizeof(*new_r), GFP_KERNEL);
	156	if (!new_r)
	157	return -ENOMEM;
	158	memset(new_r, 0, sizeof(*new_r));
ecba320f	159
1da177e4 LT	160	if (rta[RTA_SRC-1])
	161	memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
	162	if (rta[RTA_DST-1])
	163	memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
	164	if (rta[RTA_GATEWAY-1])
	165	memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
	166	new_r->r_src_len = rtm->rtm_src_len;
	167	new_r->r_dst_len = rtm->rtm_dst_len;
	168	new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
	169	new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
	170	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	171	if (rta[RTA_PROTOINFO-1])
	172	memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
	173	#endif
	174	new_r->r_action = rtm->rtm_type;
	175	new_r->r_flags = rtm->rtm_flags;
	176	if (rta[RTA_PRIORITY-1])
	177	memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
	178	new_r->r_table = table_id;
	179	if (rta[RTA_IIF-1]) {
	180	struct net_device *dev;
	181	rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
	182	new_r->r_ifindex = -1;
	183	dev = dev_get_by_name(new_r->r_ifname);
	184	if (dev) {
	185	new_r->r_ifindex = dev->ifindex;
	186	dev_put(dev);
	187	}
	188	}
	189
ecba320f	190	r = container_of(dn_fib_rules.first, struct dn_fib_rule, r_hlist);
1da177e4	191	if (!new_r->r_preference) {
ecba320f SW	192	if (r && r->r_hlist.next != NULL) {
ecba320f SW	193	r = container_of(r->r_hlist.next, struct dn_fib_rule, r_hlist);
1da177e4 LT	194	if (r->r_preference)
	195	new_r->r_preference = r->r_preference - 1;
	196	}
	197	}
	198
ecba320f	199	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	200	if (r->r_preference > new_r->r_preference)
1da177e4 LT	201	break;
ecba320f	202	last = r;
1da177e4	203	}
1da177e4	204	atomic_inc(&new_r->r_clntref);
ecba320f SW	205
	206	if (last)
	207	hlist_add_after_rcu(&last->r_hlist, &new_r->r_hlist);
	208	else
	209	hlist_add_before_rcu(&new_r->r_hlist, &r->r_hlist);
1da177e4 LT	210	return 0;
	211	}
	212
	213
	214	int dn_fib_lookup(const struct flowi flp, struct dn_fib_res res)
	215	{
	216	struct dn_fib_rule r, policy;
	217	struct dn_fib_table *tb;
c4ea94ab SW	218	__le16 saddr = flp->fld_src;
c4ea94ab SW	219	__le16 daddr = flp->fld_dst;
ecba320f	220	struct hlist_node *node;
1da177e4 LT	221	int err;
1da177e4 LT	222
ecba320f SW	223	rcu_read_lock();
	224
	225	hlist_for_each_entry_rcu(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	226	if (((saddr^r->r_src) & r->r_srcmask) \|\|
	227	((daddr^r->r_dst) & r->r_dstmask) \|\|
	228	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	229	(r->r_fwmark && r->r_fwmark != flp->fld_fwmark) \|\|
	230	#endif
	231	(r->r_ifindex && r->r_ifindex != flp->iif))
	232	continue;
	233
	234	switch(r->r_action) {
	235	case RTN_UNICAST:
	236	case RTN_NAT:
	237	policy = r;
	238	break;
	239	case RTN_UNREACHABLE:
ecba320f	240	rcu_read_unlock();
1da177e4 LT	241	return -ENETUNREACH;
	242	default:
	243	case RTN_BLACKHOLE:
ecba320f	244	rcu_read_unlock();
1da177e4 LT	245	return -EINVAL;
1da177e4 LT	246	case RTN_PROHIBIT:
ecba320f	247	rcu_read_unlock();
1da177e4 LT	248	return -EACCES;
	249	}
	250
	251	if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
	252	continue;
	253	err = tb->lookup(tb, flp, res);
	254	if (err == 0) {
	255	res->r = policy;
	256	if (policy)
	257	atomic_inc(&policy->r_clntref);
ecba320f	258	rcu_read_unlock();
1da177e4 LT	259	return 0;
	260	}
	261	if (err < 0 && err != -EAGAIN) {
ecba320f	262	rcu_read_unlock();
1da177e4 LT	263	return err;
	264	}
	265	}
	266
ecba320f	267	rcu_read_unlock();
1da177e4 LT	268	return -ESRCH;
	269	}
	270
c4ea94ab	271	unsigned dnet_addr_type(__le16 addr)
1da177e4 LT	272	{
	273	struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
	274	struct dn_fib_res res;
	275	unsigned ret = RTN_UNICAST;
	276	struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];
	277
	278	res.r = NULL;
	279
	280	if (tb) {
	281	if (!tb->lookup(tb, &fl, &res)) {
	282	ret = res.type;
	283	dn_fib_res_put(&res);
	284	}
	285	}
	286	return ret;
	287	}
	288
c4ea94ab	289	__le16 dn_fib_rules_policy(__le16 saddr, struct dn_fib_res res, unsigned flags)
1da177e4 LT	290	{
	291	struct dn_fib_rule *r = res->r;
	292
	293	if (r->r_action == RTN_NAT) {
	294	int addrtype = dnet_addr_type(r->r_srcmap);
	295
	296	if (addrtype == RTN_NAT) {
	297	saddr = (saddr&~r->r_srcmask)\|r->r_srcmap;
	298	*flags \|= RTCF_SNAT;
	299	} else if (addrtype == RTN_LOCAL \|\| r->r_srcmap == 0) {
	300	saddr = r->r_srcmap;
	301	*flags \|= RTCF_MASQ;
	302	}
	303	}
	304	return saddr;
	305	}
	306
	307	static void dn_fib_rules_detach(struct net_device *dev)
	308	{
ecba320f	309	struct hlist_node *node;
1da177e4 LT	310	struct dn_fib_rule *r;
1da177e4 LT	311
ecba320f SW	312	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
ecba320f SW	313	if (r->r_ifindex == dev->ifindex)
1da177e4	314	r->r_ifindex = -1;
1da177e4 LT	315	}
	316	}
	317
	318	static void dn_fib_rules_attach(struct net_device *dev)
	319	{
ecba320f	320	struct hlist_node *node;
1da177e4 LT	321	struct dn_fib_rule *r;
1da177e4 LT	322
ecba320f SW	323	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
ecba320f SW	324	if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0)
1da177e4	325	r->r_ifindex = dev->ifindex;
1da177e4 LT	326	}
	327	}
	328
	329	static int dn_fib_rules_event(struct notifier_block this, unsigned long event, void ptr)
	330	{
	331	struct net_device *dev = ptr;
	332
	333	switch(event) {
	334	case NETDEV_UNREGISTER:
	335	dn_fib_rules_detach(dev);
	336	dn_fib_sync_down(0, dev, 1);
	337	case NETDEV_REGISTER:
	338	dn_fib_rules_attach(dev);
	339	dn_fib_sync_up(dev);
	340	}
	341
	342	return NOTIFY_DONE;
	343	}
	344
	345
	346	static struct notifier_block dn_fib_rules_notifier = {
	347	.notifier_call = dn_fib_rules_event,
	348	};
	349
b6544c0b JHS	350	static int dn_fib_fill_rule(struct sk_buff skb, struct dn_fib_rule r,
b6544c0b JHS	351	struct netlink_callback *cb, unsigned int flags)
1da177e4 LT	352	{
	353	struct rtmsg *rtm;
	354	struct nlmsghdr *nlh;
	355	unsigned char *b = skb->tail;
	356
	357
b6544c0b	358	nlh = NLMSG_NEW_ANSWER(skb, cb, RTM_NEWRULE, sizeof(*rtm), flags);
1da177e4 LT	359	rtm = NLMSG_DATA(nlh);
	360	rtm->rtm_family = AF_DECnet;
	361	rtm->rtm_dst_len = r->r_dst_len;
	362	rtm->rtm_src_len = r->r_src_len;
	363	rtm->rtm_tos = 0;
	364	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	365	if (r->r_fwmark)
	366	RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
	367	#endif
	368	rtm->rtm_table = r->r_table;
	369	rtm->rtm_protocol = 0;
	370	rtm->rtm_scope = 0;
	371	rtm->rtm_type = r->r_action;
	372	rtm->rtm_flags = r->r_flags;
	373
	374	if (r->r_dst_len)
	375	RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
	376	if (r->r_src_len)
	377	RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
	378	if (r->r_ifname[0])
	379	RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
	380	if (r->r_preference)
	381	RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
	382	if (r->r_srcmap)
	383	RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
	384	nlh->nlmsg_len = skb->tail - b;
	385	return skb->len;
	386
	387	nlmsg_failure:
	388	rtattr_failure:
	389	skb_trim(skb, b - skb->data);
	390	return -1;
	391	}
	392
	393	int dn_fib_dump_rules(struct sk_buff skb, struct netlink_callback cb)
	394	{
ecba320f	395	int idx = 0;
1da177e4 LT	396	int s_idx = cb->args[0];
1da177e4 LT	397	struct dn_fib_rule *r;
ecba320f	398	struct hlist_node *node;
1da177e4	399
ecba320f SW	400	rcu_read_lock();
ecba320f SW	401	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	402	if (idx < s_idx)
1da177e4 LT	403	continue;
b6544c0b	404	if (dn_fib_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
1da177e4	405	break;
ecba320f	406	idx++;
1da177e4	407	}
ecba320f	408	rcu_read_unlock();
1da177e4 LT	409	cb->args[0] = idx;
	410
	411	return skb->len;
	412	}
	413
	414	void __init dn_fib_rules_init(void)
	415	{
ecba320f SW	416	INIT_HLIST_HEAD(&dn_fib_rules);
ecba320f SW	417	hlist_add_head(&default_rule.r_hlist, &dn_fib_rules);
1da177e4 LT	418	register_netdevice_notifier(&dn_fib_rules_notifier);
	419	}
	420
	421	void __exit dn_fib_rules_cleanup(void)
	422	{
	423	unregister_netdevice_notifier(&dn_fib_rules_notifier);
	424	}
	425
	426