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/*
* 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/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 __u16 ipx_cksum(struct ipxhdr *packet, int length);
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);
extern int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb,
char *node);
extern struct ipx_interface *ipxitf_find_using_net(__be32 net);
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 iovec *iov, 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->h.raw = skb->nh.raw = 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_fromiovec(skb_put(skb, len), iov, len);
if (rc) {
kfree_skb(skb);
goto out_put;
}
/* Apply checksum. Not allowed on 802.3 links. */
if (sk->sk_no_check || intrfc->if_dlink_type == htons(IPX_FRAME_8023))
ipx->ipx_checksum = 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;
}
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