[net-next-2.6.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/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 = kzalloc(sizeof(*new_r), GFP_KERNEL);
	if (!new_r)
		return -ENOMEM;

	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)
			goto next;
		if (dn_fib_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
			break;
next:
		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	*/
1da177e4 LT	16	#include <linux/string.h>
	17	#include <linux/net.h>
	18	#include <linux/socket.h>
	19	#include <linux/sockios.h>
	20	#include <linux/init.h>
	21	#include <linux/skbuff.h>
	22	#include <linux/netlink.h>
	23	#include <linux/rtnetlink.h>
	24	#include <linux/proc_fs.h>
	25	#include <linux/netdevice.h>
	26	#include <linux/timer.h>
	27	#include <linux/spinlock.h>
	28	#include <linux/in_route.h>
ecba320f SW	29	#include <linux/list.h>
ecba320f SW	30	#include <linux/rcupdate.h>
1da177e4 LT	31	#include <asm/atomic.h>
	32	#include <asm/uaccess.h>
	33	#include <net/neighbour.h>
	34	#include <net/dst.h>
	35	#include <net/flow.h>
	36	#include <net/dn.h>
	37	#include <net/dn_fib.h>
	38	#include <net/dn_neigh.h>
	39	#include <net/dn_dev.h>
	40
	41	struct dn_fib_rule
	42	{
ecba320f	43	struct hlist_node r_hlist;
1da177e4 LT	44	atomic_t r_clntref;
	45	u32 r_preference;
	46	unsigned char r_table;
	47	unsigned char r_action;
	48	unsigned char r_dst_len;
	49	unsigned char r_src_len;
c4ea94ab SW	50	__le16 r_src;
	51	__le16 r_srcmask;
	52	__le16 r_dst;
	53	__le16 r_dstmask;
	54	__le16 r_srcmap;
1da177e4 LT	55	u8 r_flags;
	56	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	57	u32 r_fwmark;
	58	#endif
	59	int r_ifindex;
	60	char r_ifname[IFNAMSIZ];
	61	int r_dead;
ecba320f	62	struct rcu_head rcu;
1da177e4 LT	63	};
	64
	65	static struct dn_fib_rule default_rule = {
	66	.r_clntref = ATOMIC_INIT(2),
	67	.r_preference = 0x7fff,
	68	.r_table = RT_TABLE_MAIN,
	69	.r_action = RTN_UNICAST
	70	};
	71
ecba320f	72	static struct hlist_head dn_fib_rules;
1da177e4 LT	73
	74	int dn_fib_rtm_delrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
	75	{
	76	struct rtattr **rta = arg;
	77	struct rtmsg *rtm = NLMSG_DATA(nlh);
ecba320f SW	78	struct dn_fib_rule *r;
ecba320f SW	79	struct hlist_node *node;
1da177e4 LT	80	int err = -ESRCH;
1da177e4 LT	81
ecba320f	82	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	83	if ((!rta[RTA_SRC-1] \|\| memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
	84	rtm->rtm_src_len == r->r_src_len &&
	85	rtm->rtm_dst_len == r->r_dst_len &&
	86	(!rta[RTA_DST-1] \|\| memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
	87	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	88	(!rta[RTA_PROTOINFO-1] \|\| memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
	89	#endif
	90	(!rtm->rtm_type \|\| rtm->rtm_type == r->r_action) &&
	91	(!rta[RTA_PRIORITY-1] \|\| memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
	92	(!rta[RTA_IIF-1] \|\| rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
	93	(!rtm->rtm_table \|\| (r && rtm->rtm_table == r->r_table))) {
	94
	95	err = -EPERM;
	96	if (r == &default_rule)
	97	break;
	98
ecba320f	99	hlist_del_rcu(&r->r_hlist);
1da177e4	100	r->r_dead = 1;
1da177e4 LT	101	dn_fib_rule_put(r);
	102	err = 0;
	103	break;
	104	}
	105	}
	106
	107	return err;
	108	}
	109
ecba320f SW	110	static inline void dn_fib_rule_put_rcu(struct rcu_head *head)
	111	{
	112	struct dn_fib_rule *r = container_of(head, struct dn_fib_rule, rcu);
	113	kfree(r);
	114	}
	115
1da177e4 LT	116	void dn_fib_rule_put(struct dn_fib_rule *r)
	117	{
	118	if (atomic_dec_and_test(&r->r_clntref)) {
	119	if (r->r_dead)
ecba320f	120	call_rcu(&r->rcu, dn_fib_rule_put_rcu);
1da177e4 LT	121	else
	122	printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
	123	}
	124	}
	125
	126
	127	int dn_fib_rtm_newrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
	128	{
	129	struct rtattr **rta = arg;
	130	struct rtmsg *rtm = NLMSG_DATA(nlh);
ecba320f SW	131	struct dn_fib_rule r, new_r, *last = NULL;
ecba320f SW	132	struct hlist_node *node = NULL;
1da177e4 LT	133	unsigned char table_id;
	134
	135	if (rtm->rtm_src_len > 16 \|\| rtm->rtm_dst_len > 16)
	136	return -EINVAL;
	137
	138	if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
	139	return -EINVAL;
	140
	141	if (rtm->rtm_type == RTN_NAT)
	142	return -EINVAL;
	143
	144	table_id = rtm->rtm_table;
	145	if (table_id == RT_TABLE_UNSPEC) {
	146	struct dn_fib_table *tb;
	147	if (rtm->rtm_type == RTN_UNICAST) {
	148	if ((tb = dn_fib_empty_table()) == NULL)
	149	return -ENOBUFS;
	150	table_id = tb->n;
	151	}
	152	}
	153
0da974f4	154	new_r = kzalloc(sizeof(*new_r), GFP_KERNEL);
1da177e4 LT	155	if (!new_r)
1da177e4 LT	156	return -ENOMEM;
ecba320f	157
1da177e4 LT	158	if (rta[RTA_SRC-1])
	159	memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
	160	if (rta[RTA_DST-1])
	161	memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
	162	if (rta[RTA_GATEWAY-1])
	163	memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
	164	new_r->r_src_len = rtm->rtm_src_len;
	165	new_r->r_dst_len = rtm->rtm_dst_len;
	166	new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
	167	new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
	168	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	169	if (rta[RTA_PROTOINFO-1])
	170	memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
	171	#endif
	172	new_r->r_action = rtm->rtm_type;
	173	new_r->r_flags = rtm->rtm_flags;
	174	if (rta[RTA_PRIORITY-1])
	175	memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
	176	new_r->r_table = table_id;
	177	if (rta[RTA_IIF-1]) {
	178	struct net_device *dev;
	179	rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
	180	new_r->r_ifindex = -1;
	181	dev = dev_get_by_name(new_r->r_ifname);
	182	if (dev) {
	183	new_r->r_ifindex = dev->ifindex;
	184	dev_put(dev);
	185	}
	186	}
	187
ecba320f	188	r = container_of(dn_fib_rules.first, struct dn_fib_rule, r_hlist);
1da177e4	189	if (!new_r->r_preference) {
ecba320f SW	190	if (r && r->r_hlist.next != NULL) {
ecba320f SW	191	r = container_of(r->r_hlist.next, struct dn_fib_rule, r_hlist);
1da177e4 LT	192	if (r->r_preference)
	193	new_r->r_preference = r->r_preference - 1;
	194	}
	195	}
	196
ecba320f	197	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	198	if (r->r_preference > new_r->r_preference)
1da177e4 LT	199	break;
ecba320f	200	last = r;
1da177e4	201	}
1da177e4	202	atomic_inc(&new_r->r_clntref);
ecba320f SW	203
	204	if (last)
	205	hlist_add_after_rcu(&last->r_hlist, &new_r->r_hlist);
	206	else
	207	hlist_add_before_rcu(&new_r->r_hlist, &r->r_hlist);
1da177e4 LT	208	return 0;
	209	}
	210
	211
	212	int dn_fib_lookup(const struct flowi flp, struct dn_fib_res res)
	213	{
	214	struct dn_fib_rule r, policy;
	215	struct dn_fib_table *tb;
c4ea94ab SW	216	__le16 saddr = flp->fld_src;
c4ea94ab SW	217	__le16 daddr = flp->fld_dst;
ecba320f	218	struct hlist_node *node;
1da177e4 LT	219	int err;
1da177e4 LT	220
ecba320f SW	221	rcu_read_lock();
	222
	223	hlist_for_each_entry_rcu(r, node, &dn_fib_rules, r_hlist) {
1da177e4 LT	224	if (((saddr^r->r_src) & r->r_srcmask) \|\|
	225	((daddr^r->r_dst) & r->r_dstmask) \|\|
	226	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	227	(r->r_fwmark && r->r_fwmark != flp->fld_fwmark) \|\|
	228	#endif
	229	(r->r_ifindex && r->r_ifindex != flp->iif))
	230	continue;
	231
	232	switch(r->r_action) {
	233	case RTN_UNICAST:
	234	case RTN_NAT:
	235	policy = r;
	236	break;
	237	case RTN_UNREACHABLE:
ecba320f	238	rcu_read_unlock();
1da177e4 LT	239	return -ENETUNREACH;
	240	default:
	241	case RTN_BLACKHOLE:
ecba320f	242	rcu_read_unlock();
1da177e4 LT	243	return -EINVAL;
1da177e4 LT	244	case RTN_PROHIBIT:
ecba320f	245	rcu_read_unlock();
1da177e4 LT	246	return -EACCES;
	247	}
	248
	249	if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
	250	continue;
	251	err = tb->lookup(tb, flp, res);
	252	if (err == 0) {
	253	res->r = policy;
	254	if (policy)
	255	atomic_inc(&policy->r_clntref);
ecba320f	256	rcu_read_unlock();
1da177e4 LT	257	return 0;
	258	}
	259	if (err < 0 && err != -EAGAIN) {
ecba320f	260	rcu_read_unlock();
1da177e4 LT	261	return err;
	262	}
	263	}
	264
ecba320f	265	rcu_read_unlock();
1da177e4 LT	266	return -ESRCH;
	267	}
	268
c4ea94ab	269	unsigned dnet_addr_type(__le16 addr)
1da177e4 LT	270	{
	271	struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
	272	struct dn_fib_res res;
	273	unsigned ret = RTN_UNICAST;
	274	struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];
	275
	276	res.r = NULL;
	277
	278	if (tb) {
	279	if (!tb->lookup(tb, &fl, &res)) {
	280	ret = res.type;
	281	dn_fib_res_put(&res);
	282	}
	283	}
	284	return ret;
	285	}
	286
c4ea94ab	287	__le16 dn_fib_rules_policy(__le16 saddr, struct dn_fib_res res, unsigned flags)
1da177e4 LT	288	{
	289	struct dn_fib_rule *r = res->r;
	290
	291	if (r->r_action == RTN_NAT) {
	292	int addrtype = dnet_addr_type(r->r_srcmap);
	293
	294	if (addrtype == RTN_NAT) {
	295	saddr = (saddr&~r->r_srcmask)\|r->r_srcmap;
	296	*flags \|= RTCF_SNAT;
	297	} else if (addrtype == RTN_LOCAL \|\| r->r_srcmap == 0) {
	298	saddr = r->r_srcmap;
	299	*flags \|= RTCF_MASQ;
	300	}
	301	}
	302	return saddr;
	303	}
	304
	305	static void dn_fib_rules_detach(struct net_device *dev)
	306	{
ecba320f	307	struct hlist_node *node;
1da177e4 LT	308	struct dn_fib_rule *r;
1da177e4 LT	309
ecba320f SW	310	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
ecba320f SW	311	if (r->r_ifindex == dev->ifindex)
1da177e4	312	r->r_ifindex = -1;
1da177e4 LT	313	}
	314	}
	315
	316	static void dn_fib_rules_attach(struct net_device *dev)
	317	{
ecba320f	318	struct hlist_node *node;
1da177e4 LT	319	struct dn_fib_rule *r;
1da177e4 LT	320
ecba320f SW	321	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
ecba320f SW	322	if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0)
1da177e4	323	r->r_ifindex = dev->ifindex;
1da177e4 LT	324	}
	325	}
	326
	327	static int dn_fib_rules_event(struct notifier_block this, unsigned long event, void ptr)
	328	{
	329	struct net_device *dev = ptr;
	330
	331	switch(event) {
	332	case NETDEV_UNREGISTER:
	333	dn_fib_rules_detach(dev);
	334	dn_fib_sync_down(0, dev, 1);
	335	case NETDEV_REGISTER:
	336	dn_fib_rules_attach(dev);
	337	dn_fib_sync_up(dev);
	338	}
	339
	340	return NOTIFY_DONE;
	341	}
	342
	343
	344	static struct notifier_block dn_fib_rules_notifier = {
	345	.notifier_call = dn_fib_rules_event,
	346	};
	347
b6544c0b JHS	348	static int dn_fib_fill_rule(struct sk_buff skb, struct dn_fib_rule r,
b6544c0b JHS	349	struct netlink_callback *cb, unsigned int flags)
1da177e4 LT	350	{
	351	struct rtmsg *rtm;
	352	struct nlmsghdr *nlh;
	353	unsigned char *b = skb->tail;
	354
	355
b6544c0b	356	nlh = NLMSG_NEW_ANSWER(skb, cb, RTM_NEWRULE, sizeof(*rtm), flags);
1da177e4 LT	357	rtm = NLMSG_DATA(nlh);
	358	rtm->rtm_family = AF_DECnet;
	359	rtm->rtm_dst_len = r->r_dst_len;
	360	rtm->rtm_src_len = r->r_src_len;
	361	rtm->rtm_tos = 0;
	362	#ifdef CONFIG_DECNET_ROUTE_FWMARK
	363	if (r->r_fwmark)
	364	RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
	365	#endif
	366	rtm->rtm_table = r->r_table;
	367	rtm->rtm_protocol = 0;
	368	rtm->rtm_scope = 0;
	369	rtm->rtm_type = r->r_action;
	370	rtm->rtm_flags = r->r_flags;
	371
	372	if (r->r_dst_len)
	373	RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
	374	if (r->r_src_len)
	375	RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
	376	if (r->r_ifname[0])
	377	RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
	378	if (r->r_preference)
	379	RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
	380	if (r->r_srcmap)
	381	RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
	382	nlh->nlmsg_len = skb->tail - b;
	383	return skb->len;
	384
	385	nlmsg_failure:
	386	rtattr_failure:
	387	skb_trim(skb, b - skb->data);
	388	return -1;
	389	}
	390
	391	int dn_fib_dump_rules(struct sk_buff skb, struct netlink_callback cb)
	392	{
ecba320f	393	int idx = 0;
1da177e4 LT	394	int s_idx = cb->args[0];
1da177e4 LT	395	struct dn_fib_rule *r;
ecba320f	396	struct hlist_node *node;
1da177e4	397
ecba320f SW	398	rcu_read_lock();
ecba320f SW	399	hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
1da177e4	400	if (idx < s_idx)
26e0fd1c	401	goto next;
b6544c0b	402	if (dn_fib_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
1da177e4	403	break;
26e0fd1c	404	next:
ecba320f	405	idx++;
1da177e4	406	}
ecba320f	407	rcu_read_unlock();
1da177e4 LT	408	cb->args[0] = idx;
	409
	410	return skb->len;
	411	}
	412
	413	void __init dn_fib_rules_init(void)
	414	{
ecba320f SW	415	INIT_HLIST_HEAD(&dn_fib_rules);
ecba320f SW	416	hlist_add_head(&default_rule.r_hlist, &dn_fib_rules);
1da177e4 LT	417	register_netdevice_notifier(&dn_fib_rules_notifier);
	418	}
	419
	420	void __exit dn_fib_rules_cleanup(void)
	421	{
	422	unregister_netdevice_notifier(&dn_fib_rules_notifier);
	423	}
	424
	425