[linux-2.6-block.git] / net / ipx / ipx_route.c

/*
 *	Implements the IPX routing routines.
 *	Code moved from af_ipx.c.
 *
 *	Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 2003
 *
 *	See net/ipx/ChangeLog.
 */

#include <linux/list.h>
#include <linux/route.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <net/ipx.h>
#include <net/sock.h>

LIST_HEAD(ipx_routes);
DEFINE_RWLOCK(ipx_routes_lock);

extern struct ipx_interface *ipx_internal_net;

extern struct ipx_interface *ipxitf_find_using_net(__be32 net);
extern int ipxitf_demux_socket(struct ipx_interface *intrfc,
			       struct sk_buff *skb, int copy);
extern int ipxitf_demux_socket(struct ipx_interface *intrfc,
			       struct sk_buff *skb, int copy);

struct ipx_route *ipxrtr_lookup(__be32 net)
{
	struct ipx_route *r;

	read_lock_bh(&ipx_routes_lock);
	list_for_each_entry(r, &ipx_routes, node)
		if (r->ir_net == net) {
			ipxrtr_hold(r);
			goto unlock;
		}
	r = NULL;
unlock:
	read_unlock_bh(&ipx_routes_lock);
	return r;
}

/*
 * Caller must hold a reference to intrfc
 */
int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
		     unsigned char *node)
{
	struct ipx_route *rt;
	int rc;

	/* Get a route structure; either existing or create */
	rt = ipxrtr_lookup(network);
	if (!rt) {
		rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
		rc = -EAGAIN;
		if (!rt)
			goto out;

		atomic_set(&rt->refcnt, 1);
		ipxrtr_hold(rt);
		write_lock_bh(&ipx_routes_lock);
		list_add(&rt->node, &ipx_routes);
		write_unlock_bh(&ipx_routes_lock);
	} else {
		rc = -EEXIST;
		if (intrfc == ipx_internal_net)
			goto out_put;
	}

	rt->ir_net 	= network;
	rt->ir_intrfc 	= intrfc;
	if (!node) {
		memset(rt->ir_router_node, '\0', IPX_NODE_LEN);
		rt->ir_routed = 0;
	} else {
		memcpy(rt->ir_router_node, node, IPX_NODE_LEN);
		rt->ir_routed = 1;
	}

	rc = 0;
out_put:
	ipxrtr_put(rt);
out:
	return rc;
}

void ipxrtr_del_routes(struct ipx_interface *intrfc)
{
	struct ipx_route *r, *tmp;

	write_lock_bh(&ipx_routes_lock);
	list_for_each_entry_safe(r, tmp, &ipx_routes, node)
		if (r->ir_intrfc == intrfc) {
			list_del(&r->node);
			ipxrtr_put(r);
		}
	write_unlock_bh(&ipx_routes_lock);
}

static int ipxrtr_create(struct ipx_route_definition *rd)
{
	struct ipx_interface *intrfc;
	int rc = -ENETUNREACH;

	/* Find the appropriate interface */
	intrfc = ipxitf_find_using_net(rd->ipx_router_network);
	if (!intrfc)
		goto out;
	rc = ipxrtr_add_route(rd->ipx_network, intrfc, rd->ipx_router_node);
	ipxitf_put(intrfc);
out:
	return rc;
}

static int ipxrtr_delete(__be32 net)
{
	struct ipx_route *r, *tmp;
	int rc;

	write_lock_bh(&ipx_routes_lock);
	list_for_each_entry_safe(r, tmp, &ipx_routes, node)
		if (r->ir_net == net) {
			/* Directly connected; can't lose route */
			rc = -EPERM;
			if (!r->ir_routed)
				goto out;
			list_del(&r->node);
			ipxrtr_put(r);
			rc = 0;
			goto out;
		}
	rc = -ENOENT;
out:
	write_unlock_bh(&ipx_routes_lock);
	return rc;
}

/*
 * The skb has to be unshared, we'll end up calling ipxitf_send, that'll
 * modify the packet
 */
int ipxrtr_route_skb(struct sk_buff *skb)
{
	struct ipxhdr *ipx = ipx_hdr(skb);
	struct ipx_route *r = ipxrtr_lookup(IPX_SKB_CB(skb)->ipx_dest_net);

	if (!r) {	/* no known route */
		kfree_skb(skb);
		return 0;
	}

	ipxitf_hold(r->ir_intrfc);
	ipxitf_send(r->ir_intrfc, skb, r->ir_routed ?
			r->ir_router_node : ipx->ipx_dest.node);
	ipxitf_put(r->ir_intrfc);
	ipxrtr_put(r);

	return 0;
}

/*
 * Route an outgoing frame from a socket.
 */
int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
			struct msghdr *msg, size_t len, int noblock)
{
	struct sk_buff *skb;
	struct ipx_sock *ipxs = ipx_sk(sk);
	struct ipx_interface *intrfc;
	struct ipxhdr *ipx;
	size_t size;
	int ipx_offset;
	struct ipx_route *rt = NULL;
	int rc;

	/* Find the appropriate interface on which to send packet */
	if (!usipx->sipx_network && ipx_primary_net) {
		usipx->sipx_network = ipx_primary_net->if_netnum;
		intrfc = ipx_primary_net;
	} else {
		rt = ipxrtr_lookup(usipx->sipx_network);
		rc = -ENETUNREACH;
		if (!rt)
			goto out;
		intrfc = rt->ir_intrfc;
	}

	ipxitf_hold(intrfc);
	ipx_offset = intrfc->if_ipx_offset;
	size = sizeof(struct ipxhdr) + len + ipx_offset;

	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
	if (!skb)
		goto out_put;

	skb_reserve(skb, ipx_offset);
	skb->sk = sk;

	/* Fill in IPX header */
	skb_reset_network_header(skb);
	skb_reset_transport_header(skb);
	skb_put(skb, sizeof(struct ipxhdr));
	ipx = ipx_hdr(skb);
	ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr));
	IPX_SKB_CB(skb)->ipx_tctrl = 0;
	ipx->ipx_type 	 = usipx->sipx_type;

	IPX_SKB_CB(skb)->last_hop.index = -1;
#ifdef CONFIG_IPX_INTERN
	IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum;
	memcpy(ipx->ipx_source.node, ipxs->node, IPX_NODE_LEN);
#else
	rc = ntohs(ipxs->port);
	if (rc == 0x453 || rc == 0x452) {
		/* RIP/SAP special handling for mars_nwe */
		IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
		memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN);
	} else {
		IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum;
		memcpy(ipx->ipx_source.node, ipxs->intrfc->if_node,
			IPX_NODE_LEN);
	}
#endif	/* CONFIG_IPX_INTERN */
	ipx->ipx_source.sock		= ipxs->port;
	IPX_SKB_CB(skb)->ipx_dest_net	= usipx->sipx_network;
	memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN);
	ipx->ipx_dest.sock		= usipx->sipx_port;

	rc = memcpy_from_msg(skb_put(skb, len), msg, len);
	if (rc) {
		kfree_skb(skb);
		goto out_put;
	}

	/* Apply checksum. Not allowed on 802.3 links. */
	if (sk->sk_no_check_tx ||
	    intrfc->if_dlink_type == htons(IPX_FRAME_8023))
		ipx->ipx_checksum = htons(0xFFFF);
	else
		ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr));

	rc = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ?
			 rt->ir_router_node : ipx->ipx_dest.node);
out_put:
	ipxitf_put(intrfc);
	if (rt)
		ipxrtr_put(rt);
out:
	return rc;
}

/*
 * We use a normal struct rtentry for route handling
 */
int ipxrtr_ioctl(unsigned int cmd, void __user *arg)
{
	struct rtentry rt;	/* Use these to behave like 'other' stacks */
	struct sockaddr_ipx *sg, *st;
	int rc = -EFAULT;

	if (copy_from_user(&rt, arg, sizeof(rt)))
		goto out;

	sg = (struct sockaddr_ipx *)&rt.rt_gateway;
	st = (struct sockaddr_ipx *)&rt.rt_dst;

	rc = -EINVAL;
	if (!(rt.rt_flags & RTF_GATEWAY) || /* Direct routes are fixed */
	    sg->sipx_family != AF_IPX ||
	    st->sipx_family != AF_IPX)
		goto out;

	switch (cmd) {
	case SIOCDELRT:
		rc = ipxrtr_delete(st->sipx_network);
		break;
	case SIOCADDRT: {
		struct ipx_route_definition f;
		f.ipx_network		= st->sipx_network;
		f.ipx_router_network	= sg->sipx_network;
		memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN);
		rc = ipxrtr_create(&f);
		break;
	}
	}

out:
	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Implements the IPX routing routines.
	3	* Code moved from af_ipx.c.
	4	*
	5	* Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 2003
	6	*
	7	* See net/ipx/ChangeLog.
	8	*/
	9
1da177e4 LT	10	#include <linux/list.h>
1da177e4 LT	11	#include <linux/route.h>
5a0e3ad6	12	#include <linux/slab.h>
1da177e4 LT	13	#include <linux/spinlock.h>
	14
	15	#include <net/ipx.h>
	16	#include <net/sock.h>
	17
	18	LIST_HEAD(ipx_routes);
	19	DEFINE_RWLOCK(ipx_routes_lock);
	20
	21	extern struct ipx_interface *ipx_internal_net;
	22
4833ed09	23	extern struct ipx_interface *ipxitf_find_using_net(__be32 net);
1da177e4 LT	24	extern int ipxitf_demux_socket(struct ipx_interface *intrfc,
	25	struct sk_buff *skb, int copy);
	26	extern int ipxitf_demux_socket(struct ipx_interface *intrfc,
	27	struct sk_buff *skb, int copy);
1da177e4	28
4833ed09	29	struct ipx_route *ipxrtr_lookup(__be32 net)
1da177e4 LT	30	{
	31	struct ipx_route *r;
	32
	33	read_lock_bh(&ipx_routes_lock);
	34	list_for_each_entry(r, &ipx_routes, node)
	35	if (r->ir_net == net) {
	36	ipxrtr_hold(r);
	37	goto unlock;
	38	}
	39	r = NULL;
	40	unlock:
	41	read_unlock_bh(&ipx_routes_lock);
	42	return r;
	43	}
	44
	45	/*
	46	* Caller must hold a reference to intrfc
	47	*/
4833ed09	48	int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
1da177e4 LT	49	unsigned char *node)
	50	{
	51	struct ipx_route *rt;
	52	int rc;
	53
	54	/* Get a route structure; either existing or create */
	55	rt = ipxrtr_lookup(network);
	56	if (!rt) {
	57	rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
	58	rc = -EAGAIN;
	59	if (!rt)
	60	goto out;
	61
	62	atomic_set(&rt->refcnt, 1);
	63	ipxrtr_hold(rt);
	64	write_lock_bh(&ipx_routes_lock);
	65	list_add(&rt->node, &ipx_routes);
	66	write_unlock_bh(&ipx_routes_lock);
	67	} else {
	68	rc = -EEXIST;
	69	if (intrfc == ipx_internal_net)
	70	goto out_put;
	71	}
	72
	73	rt->ir_net = network;
	74	rt->ir_intrfc = intrfc;
	75	if (!node) {
	76	memset(rt->ir_router_node, '\0', IPX_NODE_LEN);
	77	rt->ir_routed = 0;
	78	} else {
	79	memcpy(rt->ir_router_node, node, IPX_NODE_LEN);
	80	rt->ir_routed = 1;
	81	}
	82
	83	rc = 0;
	84	out_put:
	85	ipxrtr_put(rt);
	86	out:
	87	return rc;
	88	}
	89
	90	void ipxrtr_del_routes(struct ipx_interface *intrfc)
	91	{
	92	struct ipx_route r, tmp;
	93
	94	write_lock_bh(&ipx_routes_lock);
	95	list_for_each_entry_safe(r, tmp, &ipx_routes, node)
	96	if (r->ir_intrfc == intrfc) {
	97	list_del(&r->node);
	98	ipxrtr_put(r);
	99	}
	100	write_unlock_bh(&ipx_routes_lock);
	101	}
	102
	103	static int ipxrtr_create(struct ipx_route_definition *rd)
	104	{
	105	struct ipx_interface *intrfc;
	106	int rc = -ENETUNREACH;
	107
	108	/* Find the appropriate interface */
	109	intrfc = ipxitf_find_using_net(rd->ipx_router_network);
	110	if (!intrfc)
	111	goto out;
	112	rc = ipxrtr_add_route(rd->ipx_network, intrfc, rd->ipx_router_node);
113	ipxitf_put(intrfc);
114	out:
115	return rc;
116	}
117
4833ed09	118	static int ipxrtr_delete(__be32 net)
1da177e4 LT	119	{
	120	struct ipx_route r, tmp;
	121	int rc;
	122
	123	write_lock_bh(&ipx_routes_lock);
	124	list_for_each_entry_safe(r, tmp, &ipx_routes, node)
	125	if (r->ir_net == net) {
	126	/* Directly connected; can't lose route */
	127	rc = -EPERM;
	128	if (!r->ir_routed)
	129	goto out;
	130	list_del(&r->node);
	131	ipxrtr_put(r);
	132	rc = 0;
	133	goto out;
	134	}
	135	rc = -ENOENT;
	136	out:
	137	write_unlock_bh(&ipx_routes_lock);
	138	return rc;
	139	}
	140
	141	/*
	142	* The skb has to be unshared, we'll end up calling ipxitf_send, that'll
	143	* modify the packet
	144	*/
	145	int ipxrtr_route_skb(struct sk_buff *skb)
	146	{
	147	struct ipxhdr *ipx = ipx_hdr(skb);
	148	struct ipx_route *r = ipxrtr_lookup(IPX_SKB_CB(skb)->ipx_dest_net);
	149
	150	if (!r) { /* no known route */
	151	kfree_skb(skb);
	152	return 0;
	153	}
	154
	155	ipxitf_hold(r->ir_intrfc);
	156	ipxitf_send(r->ir_intrfc, skb, r->ir_routed ?
	157	r->ir_router_node : ipx->ipx_dest.node);
	158	ipxitf_put(r->ir_intrfc);
	159	ipxrtr_put(r);
	160
	161	return 0;
	162	}
	163
	164	/*
	165	* Route an outgoing frame from a socket.
	166	*/
	167	int ipxrtr_route_packet(struct sock sk, struct sockaddr_ipx usipx,
e1693718	168	struct msghdr *msg, size_t len, int noblock)
1da177e4 LT	169	{
	170	struct sk_buff *skb;
	171	struct ipx_sock *ipxs = ipx_sk(sk);
	172	struct ipx_interface *intrfc;
	173	struct ipxhdr *ipx;
	174	size_t size;
	175	int ipx_offset;
	176	struct ipx_route *rt = NULL;
	177	int rc;
	178
	179	/* Find the appropriate interface on which to send packet */
	180	if (!usipx->sipx_network && ipx_primary_net) {
	181	usipx->sipx_network = ipx_primary_net->if_netnum;
	182	intrfc = ipx_primary_net;
	183	} else {
	184	rt = ipxrtr_lookup(usipx->sipx_network);
	185	rc = -ENETUNREACH;
	186	if (!rt)
	187	goto out;
	188	intrfc = rt->ir_intrfc;
	189	}
	190
	191	ipxitf_hold(intrfc);
	192	ipx_offset = intrfc->if_ipx_offset;
	193	size = sizeof(struct ipxhdr) + len + ipx_offset;
	194
	195	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
	196	if (!skb)
	197	goto out_put;
	198
	199	skb_reserve(skb, ipx_offset);
	200	skb->sk = sk;
	201
	202	/* Fill in IPX header */
7e28ecc2	203	skb_reset_network_header(skb);
badff6d0	204	skb_reset_transport_header(skb);
7e28ecc2	205	skb_put(skb, sizeof(struct ipxhdr));
1da177e4 LT	206	ipx = ipx_hdr(skb);
	207	ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr));
	208	IPX_SKB_CB(skb)->ipx_tctrl = 0;
	209	ipx->ipx_type = usipx->sipx_type;
	210
	211	IPX_SKB_CB(skb)->last_hop.index = -1;
	212	#ifdef CONFIG_IPX_INTERN
	213	IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum;
	214	memcpy(ipx->ipx_source.node, ipxs->node, IPX_NODE_LEN);
	215	#else
	216	rc = ntohs(ipxs->port);
	217	if (rc == 0x453 \|\| rc == 0x452) {
	218	/* RIP/SAP special handling for mars_nwe */
	219	IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
	220	memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN);
	221	} else {
	222	IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum;
	223	memcpy(ipx->ipx_source.node, ipxs->intrfc->if_node,
	224	IPX_NODE_LEN);
	225	}
	226	#endif /* CONFIG_IPX_INTERN */
	227	ipx->ipx_source.sock = ipxs->port;
	228	IPX_SKB_CB(skb)->ipx_dest_net = usipx->sipx_network;
	229	memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN);
	230	ipx->ipx_dest.sock = usipx->sipx_port;
	231
e1693718	232	rc = memcpy_from_msg(skb_put(skb, len), msg, len);
1da177e4 LT	233	if (rc) {
	234	kfree_skb(skb);
	235	goto out_put;
981c0ff6	236	}
1da177e4 LT	237
1da177e4 LT	238	/* Apply checksum. Not allowed on 802.3 links. */
28448b80 TH	239	if (sk->sk_no_check_tx \|\|
28448b80 TH	240	intrfc->if_dlink_type == htons(IPX_FRAME_8023))
02e60370	241	ipx->ipx_checksum = htons(0xFFFF);
1da177e4 LT	242	else
	243	ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr));
	244
981c0ff6	245	rc = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ?
1da177e4 LT	246	rt->ir_router_node : ipx->ipx_dest.node);
	247	out_put:
	248	ipxitf_put(intrfc);
	249	if (rt)
	250	ipxrtr_put(rt);
	251	out:
	252	return rc;
	253	}
	254
	255	/*
	256	* We use a normal struct rtentry for route handling
	257	*/
	258	int ipxrtr_ioctl(unsigned int cmd, void __user *arg)
	259	{
	260	struct rtentry rt; /* Use these to behave like 'other' stacks */
	261	struct sockaddr_ipx sg, st;
	262	int rc = -EFAULT;
	263
	264	if (copy_from_user(&rt, arg, sizeof(rt)))
	265	goto out;
	266
	267	sg = (struct sockaddr_ipx *)&rt.rt_gateway;
	268	st = (struct sockaddr_ipx *)&rt.rt_dst;
	269
	270	rc = -EINVAL;
	271	if (!(rt.rt_flags & RTF_GATEWAY) \|\| /* Direct routes are fixed */
	272	sg->sipx_family != AF_IPX \|\|
	273	st->sipx_family != AF_IPX)
	274	goto out;
	275
	276	switch (cmd) {
	277	case SIOCDELRT:
	278	rc = ipxrtr_delete(st->sipx_network);
	279	break;
	280	case SIOCADDRT: {
	281	struct ipx_route_definition f;
	282	f.ipx_network = st->sipx_network;
	283	f.ipx_router_network = sg->sipx_network;
	284	memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN);
	285	rc = ipxrtr_create(&f);
	286	break;
	287	}
	288	}
	289
	290	out:
	291	return rc;
	292	}