[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/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 <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 dn_fib_rule	*r_next;
	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;
};

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 dn_fib_rule *dn_fib_rules = &default_rule;
static DEFINE_RWLOCK(dn_fib_rules_lock);


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, **rp;
	int err = -ESRCH;

	for(rp=&dn_fib_rules; (r=*rp) != NULL; rp = &r->r_next) {
		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;

			write_lock_bh(&dn_fib_rules_lock);
			*rp = r->r_next;
			r->r_dead = 1;
			write_unlock_bh(&dn_fib_rules_lock);
			dn_fib_rule_put(r);
			err = 0;
			break;
		}
	}

	return err;
}

void dn_fib_rule_put(struct dn_fib_rule *r)
{
	if (atomic_dec_and_test(&r->r_clntref)) {
		if (r->r_dead)
			kfree(r);
		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, **rp;
	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);
		}
	}

	rp = &dn_fib_rules;
	if (!new_r->r_preference) {
		r = dn_fib_rules;
		if (r && (r = r->r_next) != NULL) {
			rp = &dn_fib_rules->r_next;
			if (r->r_preference)
				new_r->r_preference = r->r_preference - 1;
		}
	}

	while((r=*rp) != NULL) {
		if (r->r_preference > new_r->r_preference)
			break;
		rp = &r->r_next;
	}

	new_r->r_next = r;
	atomic_inc(&new_r->r_clntref);
	write_lock_bh(&dn_fib_rules_lock);
	*rp = new_r;
	write_unlock_bh(&dn_fib_rules_lock);
	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;
	int err;

	read_lock(&dn_fib_rules_lock);
	for(r = dn_fib_rules; r; r = r->r_next) {
		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:
				read_unlock(&dn_fib_rules_lock);
				return -ENETUNREACH;
			default:
			case RTN_BLACKHOLE:
				read_unlock(&dn_fib_rules_lock);
				return -EINVAL;
			case RTN_PROHIBIT:
				read_unlock(&dn_fib_rules_lock);
				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);
			read_unlock(&dn_fib_rules_lock);
			return 0;
		}
		if (err < 0 && err != -EAGAIN) {
			read_unlock(&dn_fib_rules_lock);
			return err;
		}
	}

	read_unlock(&dn_fib_rules_lock);
	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 dn_fib_rule *r;

	for(r = dn_fib_rules; r; r = r->r_next) {
		if (r->r_ifindex == dev->ifindex) {
			write_lock_bh(&dn_fib_rules_lock);
			r->r_ifindex = -1;
			write_unlock_bh(&dn_fib_rules_lock);
		}
	}
}

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

	for(r = dn_fib_rules; r; r = r->r_next) {
		if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0) {
			write_lock_bh(&dn_fib_rules_lock);
			r->r_ifindex = dev->ifindex;
			write_unlock_bh(&dn_fib_rules_lock);
		}
	}
}

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;
	int s_idx = cb->args[0];
	struct dn_fib_rule *r;

	read_lock(&dn_fib_rules_lock);
	for(r = dn_fib_rules, idx = 0; r; r = r->r_next, idx++) {
		if (idx < s_idx)
			continue;
		if (dn_fib_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
			break;
	}
	read_unlock(&dn_fib_rules_lock);
	cb->args[0] = idx;

	return skb->len;
}

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